Bearing unit of cranckshaft of internal combustion engine

FIELD: machine building.

SUBSTANCE: invention refers to bearing unit of crankshaft of internal combustion engine. The bearing unit consists of bearing (10) mounted on crankshaft (16) of the internal combustion engine, of seat (11, 15) of the bearing designed for placement of bearing (10) and of system (20) of packing designed for sealing relative to crankshaft (16) and seat (11, 15) of the bearing. At least one part of seat (11) of the bearing has a reinforcing element (12) positioned in the seat of the bearing. Also, surface (13) of at least one part of seat (11) of the bearing adjoining bearing (10) is made out of plastic. There are also claimed the internal combustion engine comprising the said bearing unit and a hand tool with a mechanical drive containing the said internal combustion engine.

EFFECT: improved bearing unit of crankshaft due to bearing unit sealing and optimal installation of bearing and/or bushing of bearing in seat of bearing with decreased allowances, which prevents bearing and/or bushing of bearing rotation in bearing seat; minimised hazard of bearing distortion and bearing and/or bushing of bearing compression in bearing seat under force causing finite destruction of bearing and/or bushing of bearing.

13 cl, 4 dwg

 

The technical field

The present invention relates to a bearing site of the crankshaft of the internal combustion engine and, in particular, to a bearing site of the crankshaft of the internal combustion engine hand tool with a mechanical drive.

The level of technology

In the development of internal combustion engines for a tool with a mechanical drive, such as chain saws, trimmers for hedges and for grass trimmers and the like, use sleeve bearing to eliminate the need for additional processing nests bearing in the crankshaft bearings after making nests bearing.

In documents US 4974973 and WO 97/45649 described bearing assemblies crankshaft using such bearing bushes. Bearing arrangement described, for example, in US 4974973, the bearing may be placed in the sleeve bearing, which is made in the form of tin cans covered with rubber outer peripheral surface. Rubber coated outer peripheral surface adapted to compensate for tolerances, such as deviations caused, for example, in the manufacture of nests bearings, and for sealing relative to the cylinder and crankcase. In addition, the site has an inner periphery provided with an annular seal to seal relative to uncatego shaft.

Despite the fact that this site has a number of advantages, it may encounter the following problems:

because of the relatively large tolerances in this site, there is a danger that the bearing or too loosely placed in the sleeve, causing the bearing can be rotated in the bearing sleeve or bearing including a bearing sleeve will be rotated in the bearing housing or bearing will be too strongly pressed into the bearing seat, creating the risk of tilting of the bearing or the danger that the bearing and/or bearing sleeve can be compressed in the socket bearing with force, leading to the ultimate destruction of the bearing and/or bearing bushing;

even in the case of reaching the dimensions that attain the desired compression of the bearing and bearing bushes, it may be difficult for the sealing of such a node. As a result it may be necessary to seal in the process using too much silicone glue between the bearing housing and the bearing sleeve.

In addition, the implementation of this solution may be too expensive, because rubber coated outer peripheral surface can be used costly type of rubber.

The invention

The purpose of this invention is to provide improved what about the bearing Assembly of the crankshaft, allowing to solve the problems mentioned above.

They are solved by means of a bearing arrangement of a crankshaft according to claim 1 of the claims.

According to the first aspect of the invention, opened in claim 1 of the formula of the invention, the bearing unit of the crankshaft is positioned so that at least one part of the socket of the bearing is increased, housed in the bearing housing, and the surface of at least one part of the socket bearing which is attached to the bearing, is made of plastic. Bearing unit also has a sealing system designed for sealing relative to the crankshaft and socket bearing.

If such gain should be possible to use plastics to perform the surface of the socket bearing without causing permanent deformation of the compression in the plastic. Another advantage compared with the previous technical solutions using tin cans as a sleeve bearing is that the bearing Bush with this solution, you can opt out, which leads to the reduction of tolerances between the bearing housing and the bearing, i.e. deviations in manufacturing. The remaining constructional tolerances can be accepted due to the nature of the plastic. In addition, the plastic can be made is without additional processing with low tolerances in comparison, for example, metal. Thus, in the case of a node according to the invention there is a small risk that the bearing is too loosely seated in the bearing seat, so that it can be rotated, or that it is too tightly held and bends over or damaged in any other way. Because the position of the bearing well-shaped, ensures the proper functioning of the site of the crankshaft, including the piston rod, and quality interaction site of the crankshaft and cylinder, which leads to a good performance of the engine and low emissions.

Another advantage of this site is that the diameter of the bearing unit can be reduced due to the lack sleeve bearing, resulting in more economical site. In addition, in the absence of the bearing bushing site will be easier and more economical.

When placing plastic as a layer between the bearing and strengthening, as described in claim 2, the node will be better able to withstand the loads, i.e. it may be subjected to higher loads without causing permanent deformation of the compression in the plastic. This is particularly true if the plastic is fiber reinforced plastic that is described in paragraph 4 of the claims.

When there is a system in which latania, posted by according to claim 7 claims, can be used cost-seal system, which can be obtained from simple rubber material and to provide a satisfactory seal relative to the slots of the bearing and the crankshaft. In addition, this sealing system can be obtained as a single element during a single operation.

When placing the sealing system so that she had at least one protrusion that interacts with the pressure on the bearing, according to claim 8 claims tolerances in the axial direction relative to the crankshaft can be perceived by the protrusions.

By placing at least one protrusion of the sealing system so that it fits snugly around the outer ring of the bearing, according to claim 9 of the formula of the invention can achieve a mutual displacement between the outer ring and the inner ring of the bearing. Thus, in the case of use as a bearing ball bearing ensures that the ball bearing will be in contact with both the inner and outer ring of the bearing. This achieves a long service life of the bearing.

By placing the number of the protrusions forming a discontinuous ring, is pressed against the outer ring of the bearing, with the under 10 the formula of the invention, the sealing system will facilitate the alignment of the bearing in an axial direction relative to the crankshaft.

Through the use of at least one projection having a conical shape, according to claim 11 of the formula of the invention will be achieved compression is proportional to the pressure side of the bearing. Thus, variations in dimensions in the axial direction, associated with manufacturing tolerances, can be successfully received, regardless of the size of the deviations in size.

According to the second aspect of the present invention, the set of the internal combustion engine that includes a crankshaft and at least one node according to any one of the implementation options described in this document.

According to a third aspect of the invention, the set of hand tools with a mechanical actuator that contains an internal combustion engine having a crankshaft and at least one node according to any one of the implementation options described in this document.

Brief description of drawings

Hereinafter the invention will be described in more detail with reference to the accompanying drawings, on which:

figure 1 is an embodiment of the bearing Assembly of the crankshaft according to the invention in vertical section in an axial plane crankshaft, which houses a bearing Assembly;

figure 2 is an embodiment of the bearing Assembly of the crankshaft according to the invention in vertical section the line I-I of figure 1;

figure 3 is a view in enlarged scale of part of figure 1, illustrating a part of the sealing system according to a variant implementation of the invention; and

4 is a schematic front view of the seal facing the bearing, according to a variant implementation of the invention.

Detailed description of the variants of the invention

The present invention will be described hereinafter in more detail with reference to the accompanying drawings, showing the preferred implementations of the invention. However, the present invention can be implemented in many different forms and should not be construed as limited to the options available for the implementation described here; these implementation options are available so that their description was thorough and complete and fully convey the scope of the invention specialists in this field of technology. In the drawings, the same reference positions denoted by the same elements.

In a variant implementation of the invention shown in the drawings, is used crankshaft 16, which is supported by two bearing 10 in the form of ball bearings. You can use the bearings and other types. Between the two bearings on the crankshaft mounted bearing unit 14 with the piston rod and balances. The bearing 10 is inserted into the bearing seat, which Yes is EBM implementation contains the upper half 15, which is the lower part of the cylinder of the internal combustion engine, and the lower half 11, which is part of a crankshaft of the tool, in which the node is installed. Each bearing is based on the two halves of the socket bearing so that the bearing capacity of the bearing.

According to the invention the lower half 11 of the socket bearing has a gain of 12 placed in the form of a metal layer inside the socket bearing, and is intended to be perceived pressure force on each bearing. Strengthening covered in plastic forming surface 13 of the lower half of the socket bearing, which is directly adjacent to the bearing. Thus, the surface 13 of the plastic is placed as a layer between the bearing 10 and the layer of the reinforcement 12. The surface 13 is made of fiber reinforced plastic, which can withstand high loads and temperatures that can occur in manual mechanized tool, such as a chain saw. The surface in the manufacturing process is more subtle. Usually, when using the technology of injection molding, the plastic surface 13 will have a thickness of 1-1 .5 mm, Usually layer gain 12 has a thickness of approximately 2 to 6 mm, depending on the size of the engine. The surface of the plastic adjacent to the bearing may be made of the same plastic, the rest of the crankcase. Thus, the gain is entered in the plastic casing, and the surface of the plastic will be placed as a layer between the bearing and reinforcement. In the implementation shown in the drawings, the lower half of the socket 11 of the bearing has two amplification, each of which is placed next to each bearing 10 in the form of a metallic layer inside the socket bearing.

In the implementation shown, for example, in figure 2, the cylinder 15 rests on the upper part of the crankcase 11. For this reason, the crankcase has an upper surface which contains four metal section 17, two on each bearing, which supports the cylinder and which is called the reference plane of the cylinder. Placing a layer of plastic covering the area around these four metal sections, eliminates the risk of leakage in the reference plane of the cylinder.

Embodiment shown in the drawings, also uses two separate systems 20 seals placed on the side of each bearing 10, and the side surface facing in the direction from node 14 of the crankshaft, and both seals are located around the crankshaft 16. Each system 20 seal is placed as one element for sealing relative to the crankshaft 16 and the socket 11, 15 of the bearing.

The system 20 seals used in implementation and shown in the drawings, is located as a ring seal having a diameter essentially equal to the diameter of the bearing 10.

Figure 4 shows a lateral side of the ring seal facing at that time, when the ring seal is placed on the crankshaft, the bearing 10. As shown in figure 3 and 4, the annular seal has a number of protrusions 21 placed at a certain distance from the center of the ring so that the tabs 21 are bonded to the outer ring of the bearing 10. Due to this, the tabs 21 facilitate the pushing of the outer ring 10 in the axial relative to the crankshaft 16 to the node 14 of the crankshaft, so that the bearings do push-UPS in the desired position, resulting in increased bearing life, site of the crankshaft and cylinder. The protrusions 21 preferably form a discontinuous ring, is pressed against the outer ring of the bearing 10. According to other variants of implementation of the protrusions may also have another shape, such as a continuous ring.

The protrusions 21 in the direction to the outer ring of the bearing preferably have the shape of a cone. When the protrusions 21 may be of another shape, for example square.

In the implementation described above, the cylinder is made of metal, which means that it has a metal p is the surface, adjacent to the bearing 10. This surface should be subjected to additional processing after the cylinder is manufactured, for example, in a process of injection molding, to obtain a low tolerances and smooth surface adjacent to the bearing. Although the cylinder of the internal combustion engine should be in any way subjected to additional processing in other parts of the cylinder, and performing additional processing details, which in any case takes place, the subsequent processing is more economical than the beginning of the additional processing part, which shall not be further processed.

In the described embodiment, only the lower half of the socket bearing has a plastic surface adjacent to the bearing, and the reinforcement placed in the bearing housing near the surface. However, this arrangement can also be used in the upper part of the socket bearing, or in the upper and lower parts of the socket bearing.

In the described implementation, the bearing housing contains the lower half of the cylinder and the upper half of the crankcase, which are connected by a horizontal connector. In an alternative implementation of the invention can be used with nodes of the crankshaft, in which the socket bearing raspolagaet is coaxial with the crankshaft as one whole site, capacity of a single bearing. With this design, the internal combustion engine has two slots of the bearing, one of which, i.e. the bearing housing preferably comprises a first bearing, and the other, that is, the second bearing housing preferably comprises a second bearing, placed in such a way that each bearing housing supports one corresponding bearing. Further, in this alternative implementation of the first bearing housing built in the first half of the crankcase, and the second bearing housing built in the second half of the crankcase, and the two halves of the crankcase are connected by a vertical connector, forming a sump. With this design the entire surface of the slot of the bearing or its part can be covered with plastic, and, accordingly, all the bearing seat or part thereof can be increased, housed in the bearing housing. If the gain is all the bearing housing, it may be represented in the form of a ring, made for example of metal, is located near the surface of the plastic. This ring gain should be easy to manufacture, and thus eliminates the need for final machining of the surface adjacent to the bearing.

The plastic surface of the socket bearing adjacent to the bearing, prefer the LNA presents any kind of reinforced plastic, such as reinforced carbon fiber, fiberglass or nanocomposite material. The surface may be formed of plastic of any type of high temperature heat distortion. The higher the temperature of heat distortion of the material and a thinner layer of plastic, the less will deform the plastic.

On the drawings and in the description of the disclosed preferred the embodiments and examples of the present invention, and, although subject to special terms, they are used only in specific and descriptive sense and not intended to limit the scope of the invention defined by the attached claims.

1. Bearings of the crankshaft in the internal combustion engine, comprising: a bearing (10)mounted on the crankshaft (16) of the internal combustion engine; socket (11, 15) bearing, designed to accommodate the bearing (10); system (20) seals designed to seal crankshaft (16) and sockets (11, 15) of the bearing; wherein the at least one part of the socket (11) of the bearing is increased (12)placed in the bearing housing, the surface (13), at least one part of the socket (11) of the bearing adjacent to the bearing (10)made of plastic.

2. Bearing unit according to claim 1, characterized in that the surface (1) plastic made in the form of a layer between the bearing (10) and increased (12).

3. Bearing unit according to claim 1 or 2, characterized in that the reinforcement (12) is made of metal.

4. Bearing unit according to claim 1, characterized in that the plastic surface (13), at least one part of the socket (11, 15) of the bearing is fiber reinforced plastic capable of withstanding the pressures and temperatures that occur in the internal combustion engine hand tool with a mechanical drive, such as a chain saw.

5. Bearing unit according to claim 1, characterized in that the slot (11, 15) of the bearing contains the lower half (11) and upper half (15), and amplification (12) placed in the lower half (11).

6. Bearing unit according to claim 1, characterized in that the slot (11, 15) of the bearing is made as a single part containing the bearing (10), and amplification (12) is placed generally in the socket (11, 15) of the bearing.

7. Bearing unit according to claim 1, characterized in that the system (20) seals placed around the crankshaft (16) and against the side of the bearing (10)which faces away from the node (14) of the crankshaft, the system (20) seal configured to seal relative to the crankshaft (16) and sockets (11, 15) of the bearing.

8. Bearing unit according to claim 7, characterized in that the system (20) seal has at least one projection (21)communicating with the pressure on the bearing (10) DL is pressed the bearing in an axial direction relative to the crankshaft (16).

9. Bearing unit of claim 8, wherein the at least one projection (21) is placed on the system (20) of the seal so that it is pressed against the outer ring of the bearing (10).

10. Bearing unit according to claim 9, characterized in that at least one projection (21) is a series of ledges, forming a discontinuous ring adjacent to the outer ring of the bearing (10).

11. Bearing unit according to claim 9 or 10, characterized in that at least one projection (21) has a cone shape facing in the direction of the outer ring (10).

12. The internal combustion engine, characterized in that it contains the crankshaft (16) and at least one bearing unit of the crankshaft according to any one of claims 1 to 11.

13. Hand tool with a mechanical actuator, characterized in that it contains an internal combustion engine having a crankshaft (16) and at least one bearing unit of the crankshaft according to any one of claims 1 to 11.



 

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Sliding bearing // 2398141

FIELD: machine building.

SUBSTANCE: sliding bearing consists of half-round upper insertion and half-round lower insertion separated one from another. The upper insertion consists of the first oil-conducting channel for supply of lubricating material (motor oil) from outside into a gap between the bearing and a shaft and the second oil-conducting channel facilitating flow of oil in a circular direction of the bearing. The first channel includes an opening in internal circumference opened into internal circumference of the upper insertion. The upper insertion includes a part without an internal recess without a channel on a back side relative to the opening in internal circumference in the direction of shaft rotation. An auxiliary oil-conducting channel for oil release from the second channel is made in at least one of lower insertions and in a zone on the next side of the opening in circumference in the direction of rotation. The second channel runs to a front side in the direction of shaft rotation from the opening in internal circumference to the auxiliary channel. In the second version the upper insertion of the bearing included a front end part on the front side relative to the opening, while the lower insertion includes the back end part corresponding to the front part. The auxiliary channel is formed with channels of an unloading recess and a face made on the internal circular side of at least one of the front parts of the upper insertions and the back part of the lower insertion. Oil consumption of the face channel is bigger, than oil consumption of material in the channel of the unloading recess. Also there is claimed the facility of torque transfer and the engine containing the sliding bearing.

EFFECT: sliding bearing with decreased amount of lubricating material coming out of oil gap preventing damages caused with foreign impurities.

14 cl, 48 dwg

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