Differential transmission with cleaning function

FIELD: transport.

SUBSTANCE: lubricant is forced to transmission running gears and clutch increased-friction discs. Clutch discs are engaged by said lubricant under pressure. Valve assembly with slide valve responds to clutch pressure to release portion of said lubricant from clutch discs into lower crankcase and transmission to remove dirt accumulated in clutch discs. Said slide valve is arranged to make lubricant flow only at valve intermediate displacement to minimize whatever pressure drop in transmission and clutch.

EFFECT: higher reliability.

19 cl, 5 dwg

 

The technical field to which the invention relates

The invention relates to transmissions, and more particularly, to a differential transmission.

The level of technology

Differential transmission have existed since the early 30-ies of the last century and, in particular, with the property of high friction, which allows for the transmission of the applied torque from the wheel that slips to the wheel that has traction. Transmissions of this type have a glass that receives the torque of the satellite and provides the actuation of the planetary gear, which is in the grip with the sun gears attached to the shafts connected to the wheels on opposite sides of the vehicle. Property increased friction helps to delay movement of the linear differential shafts to different wheels.

In the past, such transfer smeared what is known as the spray lubrication system. In such a system, the lower half of the device is immersed in the lubricant so that the moving gear boosted lubrication in the transmission to provide lubrication. This specific type of lubricant, although it is simple, has the disadvantage that it is unjustified losses due to the resistance to movement of the gear through the grease. In addition, the center is foreign force can result in that grease will be dropped from the reference surfaces and lead to potential damage.

In attempting to resolve problems of this type have been used the so-called transmission with dry sump, in which the lubricant was under pressure and was submitted to the neck of the shaft under the seal and other components of the rotating parts. The location of the seal leads to the fact that lubricant under pressure must be transmitted through the supporting surface and through the usual path of seepage to the pallet, where re-lubrication is exposed to pressure on the supporting surface.

When such transmissions are used, the increased friction element, it is usually made in the form of a number of the bonding surfaces, in turn connected to the housing for the differential and one of the output shafts. In the differential having a closed system, camera for such disks forms a cavity for lubrication. In addition, in the cavity tend to accumulate any dust generated when the clutch and the clutch disks, thus exerting an adverse effect on the durability of the transmission.

Therefore, in this technical field required transmission of the aforementioned type, which ensures the cleaning material in the above situation.

Disclosure of invention

The invention in one embodiment about what westline provides a device for removing contaminants from the cavity to lubricate the differential transmission with increased friction, having compacted under a pressure system for rotation and mutual coupling parts of the transmission. The device is a valve element configured to move between first and second position in response to the control action of the transmission. In the transmission performed channels between the cavities for lubrication and pallet transmission. The valve element is located in the channels and are designed to ensure the flow of lubricant from the cavity for lubrication in the pallet moving the valve element between the first and second position.

In another embodiment, the invention provides a differential transmission, comprising: a housing made with the possibility of rotation around the main axis. First and second rotatable output shafts are placed in the housing and configured to rotate around the main axis and are attached to the first and second bevel sun gears, respectively. Many of bevel planetary gear set for rotation in the housing in a mutual coupling with the first and second bevel sun gears. A device for selective engagement of the casing and one of the sun gears to limit the differential action. System is provided for supplying lubricant under pressure to the rotations is of the body, gears and devices electoral engagement, and the transmission is positioned to seal the housing, gears and device electoral engagement. The transmission has a channel from the device electoral engagement to the pallet. The valve element is installed in the channel and configured to move between first and second position in response to coupling and decoupling device electoral engagement. The valve element is arranged to ensure a flow of lubricant under pressure, from a device, the selective engagement of the pallet when moving the valve element between the first and second positions for purification device electoral engagement from contamination.

Brief description of drawings

Figure 1 is a view in cross-section transmission with limited slip differential, which uses the present invention;

Figure 2 is an enlarged view in partial section of a control system for the present invention; and

3 to 5 are enlarged views in cross section of the valve Assembly shown in figure 2, at various stages of actuation.

Detailed description of the invention

Figure 1 shows the differential transmission 10, which is generally used to transfer external Cruces the th moment of a satellite (not shown) a pair of output shafts 12 and 14. The transmission 10 has a main body 16 and a pair of end caps 18 and 20 forming part of the housing of the transmission 10. Additional characteristics of the transmission, such as reducing speed, brakes, etc. that are not shown to simplify the description of the present invention. As described below, the transmission 10 has a closed system for lubricating the rotating end interconnected parts, and lubricant passing through the various components, flows under the influence of gravity into the sump 22 for collection through appropriate filters through issue 24 to a pump (not shown)which supplies lubricant under pressure for lubricating the channel through the inlet 26.

The Cup 38 is backed by bearing assemblies 28 and 30, respectively. A pair of shafts 12 and 14 are attached at the ends to bevel sun gears 32 and 34, respectively. The sun gear 32 and 34 are in mutual coupling with numerous conical planetary gears 36 supported for rotation on the glass 38. The Cup 38 provides the installation of a satellite 40, which is engaged with a satellite (not shown) via suitable fasteners 42, which pass through the housing 37 also is connected to the Cup 38. The Cup 38, the planetary gear 36 and sun gear 32 and 34 provide a differential rotation to the shafts 12 and 14 could rotate with different soon the difficulties rpm, when the vehicle is running, the transmission 10, and passes the turn.

When the transmission 10 is installed in agricultural or industrial off-road vehicle, often there comes a time when adhesive force on one or more wheels driven shafts 12 and 14 is reduced, which makes ordinary differential to transfer all the force on the wheel that is spinning faster. In order to minimize the used differential with increased friction.

Differential with increased friction is depicted in detail in figure 2, where the number of disks 46 and 48 are interspersed between and respectively attached to the Cup 38 and the sun gear 32. The disks 46 and 48 is normally retained in the position in which they slide relative to each other, except in those cases where the operational situation requires that the condition was caused increased friction. Metal aperture 50 is shifted to the number of disks 46 and 48 to force them to reduce relative rotation between the Cup 38 and the sun gear 32, so as to minimize the effect of the differential. The circular aperture 50 may be powered by any number of means, but, as here shown, it is powered by the pressure in the chamber 52 to tighten the diaphragm 50 to the right, as shown in figure 2 for the coupling is placed disks 46 and 48. As noted above, the transmission 10 has a closed type in which the pressure to the bearings 28 and 30, the gears 32, 34 and 36 and the discs 46 and 48 is fed through the inlet 26 to ensure the continual appearance and lubrication for rotation and reduce the temperature of the gears that are in mesh, and the friction caused by the work under load. While the bearings 28 and 30 and other elements of the transmission 10 is washed by the flow of lubricant flowing to the sump 22, the disks 46 and 48 are located in the cavity 54 in which there is no regular flow of lubricant, especially in its outer periphery.

In accordance with the present invention, the system for cleaning the chamber 54 from the lubricating fluid is indicated in General by the reference position 56. The system, indicated by the position 56 shown in detail in figure 3, 4 and 5. The system 56 includes a radial output channel 58 in the housing 37, which is connected with the annular recess 60 and the annular channel 62 to the outer periphery of the chamber 54. Spool valve 64 is arranged to move in the channel 65 which intersects the annular recess 60 and the annular channel 62. Spool valve 64 is retained in the channel 65 corresponding screw 66 on the crown, screwed into the housing 37 and is sealed by o-rings 68. Spool valve 64 has an internal cavity 70, which holds the spring 72, which presses the valve unit to the screw 66 with the head. According to the respective holding element 74 is located in the channel 65 to provide a support for the springs 72. The valve element 64 has an aperture 76 located so that when the valve is in the position shown between figure 3 and figure 5, the hole 76 coincided with the recess 60 and allow the lubricant under pressure to flow from the channel 62 through the inner portion 70 of the valve 64 through the cavities 60 and out through the radial channel 58. This position is shown in detail in figure 4, showing the formation of the path of flow of the lubricant out.

The valve element 64 is moved to the position that provides clean lubricant under pressure through pressure on the end portion 78 of the spool valve 64. This pressure is transmitted to the end portion 78 of the spool valve 64 through channel 80, connected to the chamber 52, which provides the actuation disk 46 and 48 to reduce to a minimum the relative friction. Although shown as having a hydraulic pressure to operate the stack of disks and thus move the valve to provide for lubrication under pressure. For specialists in the art should be obvious that the same result can be used in other types of devices trigger.

The transmission 10 operates as a pure differential transmission, when the disks 46 and 48 of the clutch slip relative to each other, and the valve element finds the I position, shown in figure 3. Through appropriate control mechanisms on the camera 52 is influenced by pressure to move the annular diaphragm 52, concatenate disks 46 and 48 and to increase the friction differential. When this occurs, the pressure in the channel 80 is applied along the edge surface 78, pressing the valve element 64 to the position shown in figure 5. In the transition from the position of figure 3 to the position of figure 5 the valve element 64 causes the opening 76 aligned with the recess 60, thereby allowing the flow of fluid under pressure to pass radially outward through the channel 58 and then into the sump 22. This allows any accumulated dust captured outer radial peripheral areas of the chamber 54, to be purified and therefore filtered to remove impurities. Because the valve is aligned with the channel in the intermediate position, the pressure loss due to this action is strongly reduced so that the transmission is always maintained at an appropriate pressure for lubrication and cooling. In addition, since the channel for dirt is on the element 37, which rotates, centrifugal force contributes to their removal from the chamber 54.

After describing the preferred option implementation becomes obvious that they can be made of various modifications without leaving the scope of izopet the tion, defined in the attached claims.

1. Device for removing contaminants from the cavity to lubricate the differential transmission increased friction with compacted under a pressure system for rotation and mutual coupling parts of the transmission, and the device includes:
the valve element is arranged to move between first and second positions in response to the control action of the transmission;
the channels made in the transmission between the cavities for lubrication and pan transmission, while the valve element is located in the channel and configured to provide flow from the cavity for lubrication in the pallet moving the valve element between the first and second positions.

2. The device according to claim 1, in which mutually concatenate the parts are in the cavity for lubrication.

3. The device according to claim 2, in which mutually concatenate parts give differential transmission property of the increased friction.

4. The device according to claim 3, in which the valve element is a spool valve, and the channel is connected through the valve between the first and second positions.

5. The device according to claim 4, in which the valve element is spring-loaded towards a position where the channel is not connected with the pallet.

6. The device according to claim 5, in which mutually concatenate the parts are made with the possibility of PR is taking effect through pressure for the clutch, moreover, the pressure acts contrary to the action of the spring.

7. The device according to claim 1, in which the channels and the valve are located on the rotating parts in the transmission, thereby increasing the cleaning lubricant by centrifugal force.

8. The device according to claim 7, in which the rotating part is a housing of the transmission.

9. The device according to claim 8, in which mutually concatenate part is a number of adjacent clutches, immersed in the lubricant.

10. The device according to claim 9, in which mutually concatenate clutch is arranged to actuate by means of pressure fluid for the clutch.

11. Differential transmission, comprising:
the casing is made with the possibility of rotation around the main axis;
first and second rotatable output shafts, are accommodated in the housing, made with the possibility of rotation around the main axis and having attached thereto the first and second bevel sun gears, respectively;
many of bevel planetary gear set for rotation in the housing in a mutual coupling with the first and second bevel sun gears;
the device is made with the possibility of selective engagement between the housing and one of the sun gear to limit the differential action;
system for supplying lubricant under pressure is m for rotation of the housing, gear and devices electoral engagement, and the transmission is in order to seal the housing, gears and device polling gearing;
when this transmission has a tray for placing the lubricant from the housing and the gear, and the channel from the device electoral engagement to the pallet; and
valve element mounted in the channel and configured to move between first and second positions in response to coupling and decoupling device electoral engagement, and the valve element is arranged to ensure a flow of lubricant under pressure, from the device electoral engagement and pallet moving the valve element between the first and second positions for purification device electoral engagement from contamination.

12. Transmission according to claim 11, in which the valve element is a spool valve configured to move between first and second positions.

13. Transmission indicated in paragraph 12, in which the spool valve is elastically preloaded in one of two positions.

14. Transmission according to claim 11, in which the device electoral engagement made with the possibility of actuation by pressure, and the spool valve is preloaded in one of the positions by a spring, the pressure deistvie is on the spool valve against spring force.

15. Transmission according to claim 11, in which the channel and a valve located in the housing, whereby centrifugal forces contribute to cleaning the grease from the device electoral engagement.

16. Transmission indicated in paragraph 15, in which the device electoral engagement contains many clutches selectively connected to the housing and with one of the output shafts, and clutch are lubricated by lubricant under pressure.

17. Transmission according to clause 16, in which the clutch is arranged to actuate by means of pressure fluid for gear and spool valve is arranged to respond to pressure activation.

18. Transmission through 17, in which the valve element is hollow and has a hole connecting channel from the clutches with the pallet, when the valve is in position between the first and second positions.

19. Transmission on p, in which the valve element is spring-loaded in one of the positions and is arranged to respond to pressure to move to another position.



 

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