The invention relates to the field of machine parts and can be used in cable, rope systems, belt, chain gears to change their tension. In particular, the proposed device can be used in the drive handbrake rolling stock. The tension device comprises a spring-loaded swivel lever with two shoulders installed two tensioning rollers, having the ability to rotate and to produce a stretch of the flexible element. Idler rollers mounted on the shoulders of the rotary lever at equal distances from the axis center of rotation. At the end of one shoulder pivot arm attached to the spring, enabling rotation of the lever with tension rollers for possible installation in the device of the flexible element from different sides of the tension rollers through the center of rotation of the two shoulders of the lever. The technical result is to expand the functionality of the device, providing flexible tension element in the drive of the actuator in the conditions when the distance between the drive mechanism and the actuating mechanism is changed in the process. 2 Il.
Sabretech the transmission to change their tension. In particular, the proposed device can be used in the drive handbrake rolling stock.
It is known device in the form of a tension roller (Lenexa) belt gear freely mounted on an axis fixed on the end of a lever rotatable about a fixed point under the action of the load. Tension roller presses the driven branch of the flexible element (belt, chain, rope, etc), resulting in a flexible element comprises driving and driven pulleys on a large arc and creates a constant tension .
The disadvantages of this device are the limitations of its application - for clamping of the slave branch continuously moving flexible element and the impossibility of providing tension in the conditions when the distance between the drive mechanism and the actuating mechanism is changed in the process.
Known tensioner flexible element (belt) in the drive shaft of the engine, taken as a prototype, which contains a tension roller mounted on the bearing for rotation on the bracket, made in the form of a spring-loaded swivel one shoulder arm with the possibility of fixing bolts in a predetermined position. Using natino is out (break) the line of motion of the belt (rope) due to the need of larger girth strap (wire) contact the roller surface and the impossibility of providing the flexible tension element in the drive of the actuator in terms when the distance between the drive mechanism and the actuating mechanism is changed in the process.
The technical result of the present invention is to expand the functionality of the device, namely the provision of a flexible tension element in the drive of the actuator in the conditions when the distance between the drive mechanism and the actuating mechanism is changed in the process.
This technical result is achieved in that a tensioning device containing a spring-loaded swivel lever with two shoulders mounted on the idler pulley, having the ability to rotate and to produce a stretch of the flexible element, a swing arm, made two shoulders and comes with a second tensioning roller having the ability to rotate, the tension rollers mounted on the shoulders of the rotary lever at equal distances from the axis center of rotation, at the end of one shoulder pivot arm attached to the spring, enabling rotation of the lever with tension rollers for possible installation in the device of the flexible element from different sides of the tension rollers through the center of rotation of the two shoulders of the lever.
In Fig.1 shows a tensioning device of Fig.2 - scheme of RA is th at equal distances from the axis 2 of the center of its rotation are mounted on axes 3 and 4 tensioning rollers 5 and 6, having the ability to rotate. At the end of one arm of the lever 1 at a distance b horizontally from the center of rotation and at a distance e vertically from the line of centers of the pulleys 5 and 6 fixed finger 7 is attached to the spring 8. Coordinates placement of the finger 7 on the lever 1 with respect to the axes 3 and 4 of the tension rollers 5 and 6 is selected so that when the lever turns 1 with the rollers 5 and 6 axis 2 rotation force in the flexible element 9 was changed to the minimum extent. Axis 2 is installed in the bracket 10, is located at the base 11, on which is located a bracket 12 secured on the second end of the spring 8.
A flexible element (wire) 9 installed on different sides of the tension rollers 5 and 6 through the center c of rotation of the two shoulders of the lever 1, which coincides with the position of the axis 2. A flexible element (wire) 9 connects the actuator device 13 and actuator 14 (shown schematically). The second end of the spring 8 is attached to the finger 15 at a distance p from the center of the finger 7. Spring 8 and the tension rollers 5 and 6 provide a flexible tension element 9 due to the rotation of the lever 1 with the tension rollers 5 and 6.
Tension device operates as follows.
In the absence of the influence of the spring 8 on ricagno the lever arm 1, creates a torque (clockwise around the center) on the shoulder h, under which the tension rollers 5 and 6 act on the flexible element 9, picking up the slack (slack) of the flexible element.
When reducing the distance between the drive pinion 13 and 14 Executive mechanisms required length of the flexible element (rope) 9 is reduced, so that the tension device is rotated clockwise by the angle(Fig.2). When this effort in the spring 8 tensioner will decrease due to the convergence of the fingers of her attachment 7 and 15, i.e., reducing the distance p to R1.
However, when the lever 1 tensioner increases the shoulder h to h1on which the spring 8 creates a torque on the lever 1, which compensates the decrease effort in the spring 8. Distances b and e from the axis 7 of the fastening of the spring 8 on the lever 1 is chosen so that the range of possible movement of the actuator 14 relative to the base 11, the oscillation efforts in the flexible element 9 was minimal.
The use of the inventive tensioning device is possible in systems with one active (leading) branch (load constant), and in systems with two branches (the Vedas, the VA, for example car, which differs in that the drive brake mechanism is mounted in the car body, and the actuator and the brake on the cart, which is in the process of movement of the carriage changes its position relative to the body, resulting in changing the distance between the drive and actuating mechanisms and, accordingly, the required length of the flexible element (rope), transmitting force from the drive mechanism to the Executive.
Sources of information:
1. Polytechnical dictionary /Ed. by I. I. II Artobolevsky. PM: "Soviet encyclopedia", 1977, S. 310.
2. Demikhovsky C. F., Mascara N. And. Cars VAZ: the Device. The malfunction. Service. The driving. M: Patriot, 1997. 247 C., S. 27.
3. VAZ 2104-2105. Manual and parts catalogue. M: Atlases hire, 1998. 240 C., S. 18-19.
The tension device containing a spring-loaded pivot arm has mounted on the idler pulley, having the ability to rotate and to produce a stretch of the flexible element, characterized in that the swivel arm made two shoulders and comes with a second tensioning roller having the ability to rotate, the tension rollers are installed on the on the lever attached to the spring, enabling rotation of the lever with tension rollers for possible installation in the device of the flexible element from different sides of the tension rollers through the center of rotation of the two shoulders of the lever.
FIELD: transport engineering.
SUBSTANCE: invention relates to tensioning devices with displaceable springs using wedges and provided with damper to operate in combination with belts of vehicle auxiliary mechanism drives. Invention has self-contained mechanical tensioning device for belt which provides damping in response to applied load owing to action of friction forces appearing at sliding of relatively counteracting wedges. First wedge or taper piston is enclosed in housing. Taper piston interacts with second piston or with taper wedge. Surface of taper wedge slides along inner surface of housing. Taper wedge can expand in direction square to inner surface of housing. Spring brings taper wedge in engagement with taper piston. At impulse load received by pulley, piston will move into taper wedge. Taper wedge will expand relative to inner surface of housing. Expansion of taper wedge in housing will increase friction between taper wedge and housing, thus braking taper wedge and pulley. The greater the impulse, the greater expansion of taper wedge. This increases resulting friction force counteracting displacement of taper wedge relative to housing. With load reduced to minimum, friction force decreases to lower level, thus providing easy extraction of piston.
EFFECT: improved operating characteristics of device.
49 cl, 23 dwg
FIELD: mechanical engineering; internal combustion engines.
SUBSTANCE: invention can be used in camshaft drive mechanisms of internal combustion engines. Proposed hydromechanical tensioner has housing 1 with flange 2, cover with oil-feed channel 7, spring-loaded plunger 5, backward travel step lock mechanism, and device forming collar cap. Base of plunger 9 is movable, being provided with axial cylindrical projection 10. throttling hole 11 is made on projection 10 from side of base 9. with base 9 moving, oil is throttled through hole 11 into lubrication system. With base 9 moving, through section of throttle hole 11 if overlapped by inner surface of plunger 5 which increases hydraulic resistance.
EFFECT: improved serviceability and reliability of device.
2 cl, 1 dwg
FIELD: mechanical engineering.
SUBSTANCE: device comprises housing with opening and thread for lid, plunger which is mounted in the opening, composes a plunger pair with it, and cooperates with the chain through the shoe by its stop face, spring which presses the plunger in the direction of the chain tension, working chamber interposed between the housing, plunger, and lid, means for moving the plunger, and throttle port made in the housing or the lid. The means for moving the plunger is made of a spring-loaded anchor pivotally connected with the housing and transverse gear rack which is mounted at the central part of the plunger and interacts with it. The central part of the plunger is made of a cylindrical rod with the stop face which can be in a contact with the shoe of the tightening chain along the line parallel to the line of the shoe moving. The spring which presses the plunger in the direction of chain tightening is provided with a locator made of a polymeric cylindrical rod. One end of the rod is provided with flange which abuts against the plunger. The other end is provided with the transverse opening for the cotter pin which also passes through the opening made in the lid. The stop face of the cylindrical rod of the plunger is made with a radius defined by the relationship proposed.
EFFECT: enhanced reliability.
FIELD: public building structures, particularly drives for showcase rotation.
SUBSTANCE: drive to rotate showcase substantially formed as superimposed disc 4 installed on pin 5 provides force transmission from drive 12 to disc 4 by means of flexible tie having tensioning means. Flexible tie is formed as closed loop of chain 10 having rigid links. The chain passes around the disc 4 along disc surface generator. Drive has sprocket 11 of driving means. The sprocket 11 is installed on shaft of hydraulic drive 12. Hydraulic drive 12 is mounted on plate 13 moving in radial direction relative disc 4 by hydraulic power cylinder 16.
EFFECT: increased safety of the drive, improved disc position adjustment, reduced size, simplified mounting and enhanced maintainability.
7 cl, 2 dwg
FIELD: mechanical engineering.
SUBSTANCE: tension device comprises pulley (24) of the crankshaft, pulley of the auxiliary member, pulley (14) of the electric motor-generator, driving belt (3) that embraces the pulleys, first pulley (16), second pulley (26) that presses the member, rotation axle (4), first lever (42) that rotates around rotation axle (4) and passes from the first connection at rotation axle (4) to the joint at first pulley (16), and second lever (44) that rotates around rotation axle (40) and passes from the second joint at rotation axle (40) to joint at second pulley (26). The pressing member is connected with first lever (42) and second lever (44).
EFFECT: increased belt tension.
7 cl, 7 dwg
FIELD: mechanical engineering; internal combustion engines.
SUBSTANCE: invention relates to camshaft drive tension adjusters. Proposed chain tension adjuster of engine camshaft has housing, drive axle with spring, and lock. Housing accommodates movable adjusting screw whose inner space is provided with movable axle of drove with spring. Lock is made in form of cap nut turned onto cover. Ball-lock resting of drive axle is installed inside nut. Movable axle of drive is sectional, it upper part has cylindrical form, and lower part is made flat. In operating condition axle of drive is moved under action of rotating spring, one end of which is secured on upper part of drive axle. Flat clock spring is installed in tension adjuster.
EFFECT: provision of automation of chain tensioning, improved reliability of operation of chain tension adjuster.
3 cl, 3 dwg
FIELD: mechanical engineering.
SUBSTANCE: proposed device has housing 1 with base 2 and cover 3. Cylindrical bead 4 with axial groove 5 is made on base 2 of housing 1. Ring bores 6 are made on inner surface of cylindrical bead 4 with pitch "K" in which thrust rings 7 are fitted. Plunger 8 is secured on cover 3. Grooves 9 are made on outer surface of plunger with pitch "t". Pitch "k" of ring bores 6 is not divisible by pitch "t" of grooves 9, i.e. k=1.5t. Spacer spring 10 is fitted along outer surface of axial groove 5. Cover 3 is provided with axial projection 11 in form of shell. Stepped groove made on outer surface of cylindrical bead 4 accommodate mounting ring 13 which can engage with trapezoidal profile bore 14 on inner surface of axial projection 11 of cover 3 to form mounting capsule.
EFFECT: improved reliability and serviceability of automatic tensioner of flexible members.
2 cl, 1 dwg
FIELD: mechanical engineering.
SUBSTANCE: device comprises housing made of a hollow cylinder, movable lid with ring groove, oil supplying passage, and ball check valve, which defines plunger pair together with the housing, spring-loaded plunger with stop members to define assembling capsule, and step mechanism for locking reverse stroke. The plunger and housing define second plunger pair. The outer surface of the lid is provided with additional ring groove from the side of the plunger. The groove is connected with the internal space through throttle opening. The housing is provided with oil supplying opening that is located in front of the groove in the housing. A part of the cross-section of the opening opposite to the groove can be overlapped by the outer side of the lid.
EFFECT: improved structure.
1 cl, 1 dwg
FIELD: mechanical engineering, possible use when designing new belt transmissions.
SUBSTANCE: transmission includes leading and following pulleys, flat belt of closed contour and stretching device. The belt is made in form of Mobius leaf, and stretching device - in form of three spatially mounted rollers with bearing ribs, height of which equals doubled thickness of the belt. Rollers are interconnected as single structure, mounted in the section of transmission, where the belt forms a loop on idle belt branch. Leading and following pulleys are made with bearing ribs of the same height as the ones on rollers. Longitudinal axes of lower rollers are directed towards longitudinal symmetry axis of the belt at sharp angles, while the actual lower rollers are shifted relatively to one another in horizontal plane for value C=Bp.+c, where C - value of shift, Bp. - belt width, c - value of gap, 5-6 mm. Axis of the upper roller, which is mounted in upper point of belt loop, is directed at sharp angle to longitudinal axis of the belt. Bushings are freely mounted on axes of the upper and lower rollers with possible rotation, connected to bearing ribs on one side, and mounted freely with possible axial movements on other side, and spring-loaded. The upper roller is mounted with possible height adjustment, while the value of axial movements of bushings equals 2-3 times the thickness of the belt.
EFFECT: evenly distributed wear of the belt.
FIELD: mechanical engineering, in particular, stretching equipment for belt drive.
SUBSTANCE: stretching apparatus has first pulley 34, drive belt 24, first lever for supporting of first pulley 34, first bearing for mounting of first pulley, second pulley 35, second lever for supporting of second pulley 35, and second bearing for second pulley. Stretching apparatus is additionally equipped with spacer attached to first spacer attachment point and second spacer attachment point. First lever is positioned for rotation in first pivot joint. Second lever is positioned for rotation in second pivot joint. First pulley 34 and first spacer attachment point are offset crosswise relative to first pivot joint and are substantially balanced as to parasitic torque on first pivot joint.
EFFECT: increased service life and reduced wearing of bearings owing to utilization of two pulleys.
26 cl, 8 dwg