CN210344189U - Tensioner, and tensioning device and drive system having the same - Google Patents

Abstract

The utility model discloses a tensioning ware and have tensioning device and actuating system of this tensioning ware. The tensioner comprises: a body rotatably disposed; first and second friction surfaces, the first friction surface contacting the second friction surface, the first friction surface being rotatable relative to the second friction surface in one of a clockwise and a counter-clockwise direction to generate a first friction force, at least one of the first and second friction surfaces being provided with a stop; and a third friction surface and a fourth friction surface, the third and fourth friction surfaces being in contact, the third friction surface being rotatable relative to the fourth friction surface in the other of a clockwise and a counter-clockwise direction so as to generate a second friction force greater than the first friction force. By utilizing the tensioner, the belt slip rate under the transient state can be effectively reduced, the running noise of a driving system is further reduced, the service lives of the belt, the tensioner and a tensioning device are prolonged, the tension of the belt can be effectively compensated, and the swing energy of the tensioning wheel is effectively absorbed.

Description

Tensioner, and tensioning device and drive system having the same

Technical Field

The present invention relates to the field of vehicles, and in particular to a tensioner, and further to a tensioning device and a drive system having the tensioner.

Background

The front end accessory drive system transmits power to the relevant accessories (e.g., a generator, an air conditioning compressor, a hydraulic oil pump, etc.) through a belt, a pulley, and a belt tensioner with a crankshaft of an engine of the vehicle as a drive shaft.

When the engine speed is kept stable, the driving power of the front end accessory is kept stable, the belt tension is kept stable, and the length of the belt is kept unchanged. When the engine speed (suddenly) increases, the rate of change of the drive power of the front end accessory also changes (suddenly), resulting in a corresponding increase in the tension of the belt, which in turn results in an elongation of the belt (the belt is an elastic body). When the engine speed (suddenly) decreases, the rate of change of the drive power of the front end accessory also changes (suddenly) accordingly, resulting in a corresponding decrease in the tension of the belt, and thus a reduction in the length of the belt.

Since the tension pulley always abuts on the belt, the tension pulley swings about the rotational axis of the body when the length of the belt changes (elongates, shortens) with a change in the tension thereof. For example, the idler is continuously shaken (rotated) around its nominal position during actual operation. Since the driving capability of the front end accessory is adversely affected by the swinging of the tension wheel, in order to reduce the swinging of the tension wheel, the tension wheel can provide damping so as to reduce the swinging amplitude of the tension wheel and absorb the swinging energy of the tension wheel.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the problem that prior art exists, provide tensioning ware and have this tensioning device and actuating system.

In order to achieve the above object, a first aspect of the present invention provides a tensioner comprising: a body rotatably disposed; a first friction face and a second friction face, the first friction face in contact with the second friction face, the first friction face being rotatable relative to the second friction face in one of a clockwise direction and a counterclockwise direction so as to generate a first friction force, wherein at least one of the first friction face and the second friction face is provided with a stop for stopping the first friction face from rotating relative to the second friction face in the other of the clockwise direction and the counterclockwise direction; and a third friction face and a fourth friction face, the third friction face in contact with the fourth friction face, the third friction face rotatable relative to the fourth friction face in the other of the clockwise direction and the counterclockwise direction to generate a second friction force, wherein the second friction force is greater than the first friction force.

Through utilizing the basis the utility model discloses a tensioning ware not only can reduce the belt under the transient state effectively and beat the slip rate, and then further reduce actuating system's operating noise, improve belt, tensioning ware and overspeed device tensioner's life, can compensate the tension of belt moreover effectively to can absorb the swing energy of take-up pulley effectively.

Preferably, the tensioner comprises: a rotating shaft; the body is provided with an accommodating cavity, the accommodating cavity is provided with a first wall surface, the first wall surface is a peripheral wall surface or a bottom wall surface, and the body is rotatably arranged relative to the rotating shaft; the first friction piece is fixedly arranged on the first wall surface or the friction force between the first friction piece and the first wall surface is larger than the second friction force, wherein the first friction piece is provided with a first friction surface and is sleeved on the rotating shaft; the second friction piece is arranged on the first friction piece, the second friction piece is provided with a second friction surface and a third friction surface, and the second friction piece is sleeved on the rotating shaft; and the base is arranged on the second friction piece and provided with the fourth friction surface.

Preferably, the tensioner comprises: a rotating shaft; the body is provided with an accommodating cavity, the accommodating cavity is provided with a first wall surface, the first wall surface is a peripheral wall surface or a bottom wall surface, the first wall surface is the first friction surface, and the body is rotatably arranged relative to the rotating shaft; a first friction member provided on the first wall surface, the first friction member having the second friction surface and the third friction surface, the first friction member being fitted on the rotating shaft; the second friction piece is arranged on the first friction piece and provided with the fourth friction surface, and the second friction piece is sleeved on the rotating shaft; and the base is fixedly arranged on the second friction piece or the friction force between the base and the second friction piece is greater than the second friction force.

Preferably, the tensioner comprises: a rotating shaft; the body is provided with an accommodating cavity, the accommodating cavity is provided with a first wall surface, the first wall surface is a peripheral wall surface or a bottom wall surface, and the body is rotatably arranged relative to the rotating shaft; the first friction piece is fixedly arranged on the first wall surface or the friction force between the first friction piece and the first wall surface is larger than the second friction force, wherein the first friction piece is provided with a first friction surface and is sleeved on the rotating shaft; the second friction piece is arranged on the first friction piece, the second friction piece is provided with a second friction surface and a third friction surface, and the second friction piece is sleeved on the rotating shaft; a third friction member provided on the second friction member, the third friction member having the fourth friction surface, the third friction member being fitted on the rotating shaft; and the base is fixedly arranged on the third friction piece or the friction force between the base and the third friction piece is greater than the second friction force.

Preferably, the tensioner comprises: a rotating shaft; the body is provided with an accommodating cavity, the accommodating cavity is provided with a first wall surface, the first wall surface is a peripheral wall surface or a bottom wall surface, the first wall surface is the first friction surface, and the body is rotatably arranged relative to the rotating shaft; a first friction member provided on the first wall surface, the first friction member having the second friction surface and the third friction surface, the first friction member being fitted on the rotating shaft; and the base is arranged on the first friction piece and provided with the fourth friction surface.

Preferably, the coefficient of friction of the first friction surface and the second friction surface is less than the coefficient of friction of the third friction surface and the fourth friction surface.

Preferably, the stopper portion includes: a groove provided on one of the first friction face and the second friction face, the groove having a first side wall and a second side wall opposing each other in a circumferential direction of the rotating shaft, the first side wall being located downstream of the second side wall in the other of the clockwise direction and the counterclockwise direction; and a projection fitted in the groove, the projection being provided on the other of the first friction surface and the second friction surface, the projection having a first side and a second side opposite in a circumferential direction of the rotating shaft, wherein the first side is located downstream of the second side in the other of the clockwise direction and the counterclockwise direction, wherein the curvature of the first side wall is greater than the curvature of the second side wall, the curvature of the first side surface is greater than the curvature of the second side surface, or the included angle between the first side wall and the first friction surface or the included angle between the first side wall and the second friction surface is larger than the included angle between the second side wall and the first friction surface or the second friction surface, the first side face is at a greater angle to the other of the first friction face and the second friction face than the second side face.

Preferably, each of the first friction member and the second friction member is a flat plate or a circular tube.

The utility model discloses the second aspect provides overspeed device tensioner, overspeed device tensioner includes: a tensioner according to the first aspect of the present invention; a tension pulley for abutting against the belt; and a first end of the connecting piece is connected with the body of the tensioner, and a second end of the connecting piece is connected with the tensioning wheel.

Through utilizing the basis the utility model discloses a overspeed device tensioner not only can reduce the belt under the transient state effectively and beat the rate of sliding, and then further reduce actuating system's operating noise, improve belt, tensioning ware and overspeed device tensioner's life, can compensate the tension of belt moreover effectively to can absorb the swing energy of take-up pulley effectively.

The utility model discloses a third aspect provides actuating system, actuating system includes: a belt; and overspeed device tensioner, overspeed device tensioner be according to the utility model discloses the second aspect overspeed device tensioner, overspeed device tensioner's take-up pulley supports and leans on the belt.

Drawings

Fig. 1 is a schematic structural diagram of a drive system according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a drive system according to an embodiment of the present invention, with a belt having an extended length;

fig. 3 is a schematic structural view of a drive system according to an embodiment of the present invention, with a shortened length of the belt;

fig. 4 is an exploded view of a tensioner according to an embodiment of the present invention;

fig. 5 is an exploded view of a tensioner according to an embodiment of the present invention;

fig. 6 is an exploded view of a tensioner according to an embodiment of the present invention;

fig. 7 is a partial cross-sectional view of a tensioner according to an embodiment of the present invention;

fig. 8 is a partial schematic structural view of a first friction member of a tensioner according to an embodiment of the present invention;

fig. 9 is a partial schematic structural view of a second friction member of a tensioner according to an embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

A drive system 1000 according to an embodiment of the present invention is described below with reference to the drawings. As shown in fig. 1-9, a drive system 1000 according to an embodiment of the present invention includes a tensioner 100 and a belt 200. The tensioner 100 includes a tensioner 1, a tension pulley 2, and a connecting member 3.

The tensioner 1 includes a body 20, a first friction surface 310, a second friction surface 410, a third friction surface 420 and a fourth friction surface 510, the body 20 being rotatably disposed. The first friction face 310 is in contact with the second friction face 410, and the first friction face 310 is rotatable in one of a clockwise direction and a counterclockwise direction with respect to the second friction face 410 so as to generate a first frictional force. Wherein at least one of the first friction surface 310 and the second friction surface 410 is provided with a stopping portion 60 for stopping the first friction surface 310 from rotating in the other one of the clockwise direction and the counterclockwise direction with respect to the second friction surface 410.

In other words, the first friction surface 310 can only rotate in one direction relative to the second friction surface 410, but cannot rotate in the opposite direction to the above direction relative to the second friction surface 410. The third friction face 420 is in contact with the fourth friction face 510, the third friction face 420 being rotatable relative to the fourth friction face 510 in the other of the clockwise and counterclockwise directions to generate a second frictional force. The second frictional force is greater than the first frictional force.

Wherein a first end of the connecting member 3 is connected to the body 20 of the tensioner 1 and a second end of the connecting member 3 is connected to the tension pulley 2. The tensioner 2 abuts against the belt 200.

It will be appreciated by those skilled in the art that the drive system 1000 may also include a crankshaft pulley that may be connected to the crankshaft of the engine of the vehicle, i.e., the crankshaft of the engine is the drive shaft, and a front end accessory (e.g., a generator). As these may be known and irrelevant to the inventive aspects of the present application, they will not be described in detail since they are briefly described to better illustrate the inventive aspects of the present application.

When the engine rotation speed is kept stable, the driving power of the front end accessory is kept stable, the tension of the belt 200 is also kept stable, and the length of the belt 200 is kept constant. When the engine speed (suddenly) increases, the rate of change of the drive power of the front end accessory also changes (suddenly) accordingly, resulting in a corresponding increase in the tension of the belt 200, and thus in an elongation of the length of the belt 200 (the belt 200 is an elastic body). When the engine speed (suddenly) decreases, the rate of change of the drive power of the front end accessory also changes (suddenly) accordingly, resulting in a corresponding decrease in the tension of the belt 200, and thus a decrease in the length of the belt 200.

Since the tensioner 2 always abuts on the belt 200, the tensioner 2 swings about the rotational axis of the body 20 when the length of the belt 200 changes (elongates, shortens) with a change in the tension thereof. For example, the idler 2 is continuously oscillated around its nominal position during actual operation. Since the swing of the tension pulley 2 adversely affects the driving ability of the front end attachment, the tensioner 1 can provide damping to reduce the swing of the tension pulley 2 and absorb the swing energy of the tension pulley 2 in order to reduce the swing of the tension pulley 2.

In order to facilitate understanding of the technical solution of the present invention, the following briefly describes the operation of the tensioner 100 and the tensioner 1 according to the embodiment of the present invention with reference to fig. 1 to 9, taking as an example that the tensioner 2 swings counterclockwise and the first friction surface 310 rotates counterclockwise relative to the second friction surface 410 when the length of the belt 200 is extended. Accordingly, when the length of the belt 200 is shortened, the tensioner 2 swings clockwise.

When the length of the belt 200 is elongated, the body 20 rotates counterclockwise to drive the tensioner 2 to swing counterclockwise. Since the first friction surface 310 can rotate in the counterclockwise direction with respect to the second friction surface 410 and the second friction force is greater than the first friction force, even though the third friction surface 420 can rotate in the counterclockwise direction with respect to the fourth friction surface 510, eventually, the first friction surface 310 rotates in the counterclockwise direction with respect to the second friction surface 410 and the third friction surface 420 is stationary with respect to the fourth friction surface 510.

Also, since the first frictional force is less than the second frictional force, the tensioner 1 and tensioner 100 are able to provide less damping when the length of belt 200 is extended. Thereby, the dynamic response capability of the tensioner 1 and the tensioning device 100 can be greatly improved, so that the belt slip rate in a transient state can be effectively reduced, the operation noise of the driving system 1000 can be further reduced, and the service life of the belt 200, the tensioner 1 and the tensioning device 100 can be prolonged.

When the length of the belt 200 is shortened, the body 20 rotates clockwise to drive the tensioner 2 to swing clockwise. Since the stopping portion 60 can stop the first friction surface 310 from rotating clockwise relative to the second friction surface 410, the third friction surface 420 rotates counterclockwise relative to the fourth friction surface 510. Also, since the second frictional force is greater than the first frictional force, the tensioner 1 and the tensioner 100 can provide greater damping when the length of the belt 200 is shortened. The tensioner 1 and the tensioner 100 can thereby effectively compensate for the tension of the belt 200, so that the swing energy of the belt 200 can be effectively absorbed.

According to the utility model discloses tensioner 1 is through setting up two sets of friction surfaces, and the frictional force of these two sets of friction surfaces is different to can when the length of belt 200 is elongated, provide less damping, when the length of belt 200 shortens, provide great damping. Therefore, the slip ratio of the belt in the transient state can be effectively reduced, the operation noise of the driving system 1000 is further reduced, the service lives of the belt 200, the tensioner 1 and the tensioning device 100 are prolonged, the tension of the belt 200 can be effectively compensated, and the swing energy of the tensioning wheel 2 can be effectively absorbed.

Therefore, by using the tensioner 1 and the tensioning device 100 according to the embodiment of the present invention, not only the slip rate of the belt in the transient state can be effectively reduced, and further the operation noise of the driving system 1000 is further reduced, the service life of the belt 200, the tensioner 1 and the tensioning device 100 is improved, but also the tension of the belt 200 can be effectively compensated, so that the swing energy of the tensioning wheel 2 can be effectively absorbed.

Therefore, the driving system 1000 according to the embodiment of the present invention has the advantages of low belt slip rate, low noise, long service life, small swing of the tensioning device 100, etc.

As shown in fig. 1-9, in some embodiments of the invention, tensioner 1 may include a shaft 10, a body 20, and a base 50. The body 20, the connecting member 3 and the tension wheel 2 may be integrally formed, so that the structural strength of the tension device 100 may be improved, and the manufacturing difficulty and the manufacturing cost of the tension device 100 may be reduced. Tensioner 1 may be an automatic tensioner and tensioner 100 may be an automatic tensioner. The drive system 1000 may be a front end accessory drive system.

As shown in fig. 4 to 7, in the first embodiment of the present invention, the tensioner 1 may include a rotating shaft 10, a body 20, a first friction member 30, a second friction member 40, and a base 50.

The body 20 has a receiving cavity 210, and the receiving cavity 210 has a first wall 211, and the first wall 211 is a bottom wall. The body 20 is rotatably disposed with respect to the rotation shaft 10. Here, the bottom wall surface of the receiving chamber 210 refers to a wall surface of the receiving chamber 210 opposite to the open end thereof.

The first friction member 30 is fixed on the first wall surface 211 or the friction force between the first friction member 30 and the first wall surface 211 is larger than the second friction force. Thereby, the first friction member 30 is prevented from moving (rotating) relative to the body 20, i.e., the first friction member 30 and the body 20 are relatively stationary, so that the first friction member 30 and the body 20 can rotate synchronously. The first friction member 30 has a first friction surface 310, and the first friction member 30 is disposed on the rotating shaft 10. The second friction member 40 is disposed on the first friction member 30, the second friction member 40 has a second friction surface 410 and a third friction surface 420, and the second friction member 40 is disposed on the rotating shaft 10. The base 50 is disposed on the second friction member 40, and the base 50 has a fourth friction surface 510.

In order to make the technical solution of the present application easier to understand, the up-down direction is shown by an arrow a in fig. 7. Wherein the upper surface of the first friction member 30 is in surface contact with the bottom wall of the receiving cavity 210; the lower surface of the first friction member 30 contacts with the upper surface of the second friction member 40, the lower surface of the first friction member 30 is a first friction surface 310, and the upper surface of the second friction member 40 is a second friction surface 410; the lower surface of the second friction member 40 contacts the upper surface of the base 50, the lower surface of the second friction member 40 is a third friction surface 420, and the upper surface of the base 50 is a fourth friction surface 510.

As shown in fig. 4 to 7, the first friction member 30 may be a flat plate, and the second friction member 40 may be a flat plate. Preferably, the first friction member 30 may have a circular ring shape, and the second friction member 40 may have a circular ring shape.

In a second embodiment of the present invention, the tensioner 1 may include a shaft 10, a body 20, a first friction member 30, a second friction member 40, and a base 50. The tensioner 1 of the second embodiment of the present invention is different from the tensioner 1 of the first embodiment of the present invention in that: the first wall surface 211 is a peripheral wall surface, and an outer side surface (for example, an outer peripheral surface) of the first friction member 30 is in contact with the first wall surface 211; an inner surface (for example, an inner circumferential surface) of the first friction member 30 is in contact with an outer surface (for example, an outer circumferential surface) of the second friction member 40, the inner surface of the first friction member 30 is a first friction surface 310, and the outer surface of the second friction member 40 is a second friction surface 410; the inner surface (for example, the inner circumferential surface) of the second friction member 40 contacts the circumferential surface of the base 50, the inner surface of the second friction member 40 serves as a third friction surface 420, and the circumferential surface of the base 50 serves as a fourth friction surface 510.

Preferably, both the first friction member 30 and the second friction member 40 may be tubular or cylindrical. More preferably, both the first friction member 30 and the second friction member 40 may be circular tube-shaped or cylindrical. The direction adjacent to the rotating shaft 10 is an inward direction, and the direction away from the rotating shaft 10 is an outward direction. The inward and outward directions are indicated by arrows B in fig. 7.

In a third embodiment of the present invention, the tensioner 1 includes a shaft 10, a body 20, a first friction member 30, a second friction member 40, and a base 50. The body 20 has a receiving cavity 210, the receiving cavity 210 has a first wall 211, the first wall 211 is a bottom wall, and the first wall 211 is a first friction surface 310. The body 20 is rotatably disposed with respect to the rotation shaft 10. The first friction member 30 is disposed on the first wall 211, the first friction member 30 has a second friction surface 410 and a third friction surface 420, and the first friction member 30 is disposed on the rotating shaft 10. The second friction member 40 is disposed on the first friction member 30, the second friction member 40 has a fourth friction surface 510, and the second friction member 40 is disposed on the rotating shaft 10.

The base 50 is fixed on the second friction member 40 or the friction force between the base 50 and the second friction member 40 is larger than the second friction force. Thereby, the second friction member 40 and the base 50 are prevented from moving (rotating) relatively, i.e., the second friction member 40 and the base 50 are relatively stationary, so that the second friction member 40 and the base 50 can rotate synchronously.

For example, the upper surface of the first friction member 30 contacts with the bottom wall surface of the accommodating chamber 210, and the upper surface of the first friction member 30 is the second friction surface 410; the lower surface of the first friction member 30 contacts with the upper surface of the second friction member 40, the lower surface of the first friction member 30 is a third friction surface 420, and the upper surface of the second friction member 40 is a fourth friction surface 510; the lower surface of the second friction member 40 is in contact with the upper surface of the base 50.

In the fourth embodiment of the present invention, the tensioner 1 may include a shaft 10, a body 20, a first friction member 30, a second friction member 40, and a base 50. The tensioner 1 of the fourth embodiment of the present invention is different from the tensioner 1 of the third embodiment of the present invention in that: the first wall surface 211 is a peripheral wall surface, an outer side surface (for example, an outer peripheral surface) of the first friction member 30 is in contact with the first wall surface 211, and the outer side surface of the first friction member 30 is a second friction surface 410; an inner surface (for example, an inner circumferential surface) of the first friction member 30 is in contact with an outer surface (for example, an outer circumferential surface) of the second friction member 40, the inner surface of the first friction member 30 is a third friction surface 420, and the outer surface of the second friction member 40 is a fourth friction surface 510; the inner side surface (for example, inner peripheral surface) of the second friction member 40 is in contact with the peripheral surface of the base 50.

In a fifth embodiment of the present invention, the tensioner 1 includes a shaft 10, a body 20, a first friction member 30 and a base 50. The body 20 has a receiving cavity 210, the receiving cavity 210 has a first wall 211, the first wall 211 is a bottom wall, and the first wall 211 is a first friction surface 310. The body 20 is rotatably disposed with respect to the rotation shaft 10. The first friction member 30 is disposed on the first wall 211, the first friction member 30 has a second friction surface 410 and a third friction surface 420, and the first friction member 30 is disposed on the rotating shaft 10. The base 50 is disposed on the first friction member 30, and the base 50 has a fourth friction surface 510.

For example, the upper surface of the first friction member 30 contacts with the bottom wall surface of the accommodating chamber 210, and the upper surface of the first friction member 30 is the second friction surface 410; the lower surface of the first friction member 30 contacts the upper surface of the base 50, the lower surface of the first friction member 30 is a third friction surface 420, and the upper surface of the base 50 is a fourth friction surface 510.

In the sixth embodiment of the present invention, the tensioner 1 includes a rotating shaft 10, a body 20, a first friction member 30, and a base 50. The tensioner 1 of the sixth embodiment of the present invention is different from the tensioner 1 of the fifth embodiment of the present invention in that: the first wall surface 211 is a peripheral wall surface, an outer side surface (for example, an outer peripheral surface) of the first friction member 30 is in contact with the first wall surface 211, and the outer side surface of the first friction member 30 is a second friction surface 410; an inner surface (for example, an inner peripheral surface) of the first friction member 30 contacts a peripheral surface of the base 50, the inner surface of the first friction member 30 is a third friction surface 420, and the peripheral surface of the base 50 is a fourth friction surface 510.

In the seventh embodiment of the present invention, the tensioner 1 includes a rotating shaft 10, a body 20, a first friction member 30, a second friction member 40, a third friction member, and a base 50. The body 20 has a receiving cavity 210, and the receiving cavity 210 has a first wall 211, and the first wall 211 is a bottom wall. The body 20 is rotatably disposed with respect to the rotation shaft 10.

The first friction member 30 is fixed on the first wall 211 or the friction force between the first friction member 30 and the first wall 211 is greater than the second friction force, and the base 50 is fixed on the third friction member or the friction force between the base 50 and the third friction member is greater than the second friction force. Thereby, the first friction member 30 and the body 20 can be prevented from moving (rotating) and the third friction member and the base 50 can be prevented from moving (rotating), i.e., the first friction member 30 and the body 20 can be relatively stationary and the third friction member and the base 50 can be relatively stationary, so that the first friction member 30 and the body 20 can rotate synchronously and the third friction member and the base 50 can rotate synchronously.

The first friction member 30 has a first friction surface 310, and the first friction member 30 is disposed on the rotating shaft 10. The second friction member 40 is disposed on the first friction member 30, the second friction member 40 has a second friction surface 410 and a third friction surface 420, and the second friction member 40 is disposed on the rotating shaft 10. The third friction member is disposed on the second friction member 40, the third friction member has a fourth friction surface 510, and the third friction member is disposed on the rotating shaft 10.

For example, the upper surface of the first friction member 30 is in surface contact with the bottom wall of the housing chamber 210; the lower surface of the first friction member 30 contacts with the upper surface of the second friction member 40, the lower surface of the first friction member 30 is a first friction surface 310, and the upper surface of the second friction member 40 is a second friction surface 410; the lower surface of the second friction member 40 is in contact with the upper surface of the third friction member, the lower surface of the second friction member 40 is a third friction surface 420, and the upper surface of the third friction member is a fourth friction surface 510; the lower surface of the third friction member 40 is in contact with the upper surface of the base 50.

Preferably, the third friction members may be flat plate-shaped. More preferably, the third friction member may be annular.

In the eighth embodiment of the present invention, the tensioner 1 includes a rotating shaft 10, a body 20, a first friction member 30, a second friction member 40, a third friction member, and a base 50. The tensioner 1 of the eighth embodiment of the present invention is different from the tensioner 1 of the seventh embodiment of the present invention in that: the first wall surface 211 is a peripheral wall surface, and an outer side surface (for example, an outer peripheral surface) of the first friction member 30 is in contact with the first wall surface 211; an inner surface (for example, an inner circumferential surface) of the first friction member 30 is in contact with an outer surface (for example, an outer circumferential surface) of the second friction member 40, the inner surface of the first friction member 30 is a first friction surface 310, and the outer surface of the second friction member 40 is a second friction surface 410; an inner side surface (for example, an inner peripheral surface) of the second friction member 40 is in contact with an outer side surface (for example, an outer peripheral surface) of the third friction member, the inner side surface of the second friction member 40 is a third friction surface 420, and the outer side surface of the third friction member is a fourth friction surface 510; the inner surface (for example, the inner peripheral surface) of the third friction member is in contact with the peripheral surface of the base 50.

Preferably, the third friction member may be tubular or cylindrical. More preferably, the third friction member may be a circular tube or a cylinder.

As shown in fig. 4 to 7, a mounting hole is provided on the bottom wall surface of the body 20, and the first end portion of the rotating shaft 10 is relatively rotatably fitted in the mounting hole so that the body 20 can rotate about the rotating shaft 10. The second end of the shaft 10 is connected to the base 50. This makes the structure of the tensioner 1 more stable and reasonable.

In some examples of the present invention, as shown in fig. 8 and 9, the stopper 60 includes a groove 610 and a protrusion 620. A groove 610 is provided on one of the first friction face 310 and the second friction face 410 and a protrusion 620 is provided on the other of the first friction face 310 and the second friction face 410, the protrusion 620 being capable of fitting within the groove 610. Wherein the groove 610 has a first side wall 611 and a second side wall 612 opposite in the circumferential direction of the rotary shaft 10, the first side wall 611 being located downstream of the second side wall 612 in the other one of the clockwise direction and the counterclockwise direction, the protrusion 620 having a first side surface 621 and a second side surface 622 opposite in the circumferential direction of the rotary shaft 10, the first side surface 621 being located downstream of the second side surface 622 in the other one of the clockwise direction and the counterclockwise direction.

The first sidewall 611 being downstream of the second sidewall 612 in the other of the clockwise direction and the counterclockwise direction means: the second sidewall 612 is rotated (rotated) by a certain angle (a certain distance) in the other one of the clockwise direction and the counterclockwise direction to reach the position of the first sidewall 611. The first side 621 being downstream of the second side 622 in the other of the clockwise and counterclockwise directions means: the second side 622 is rotated (rotated) by a certain angle (a certain distance) in the other of the clockwise direction and the counterclockwise direction to reach the position where the first side 621 is located.

The curvature of the first sidewall 611 is greater than that of the second sidewall 612, and the curvature of the first side surface 621 is greater than that of the second side surface 622. Alternatively, the included angle between the first side wall 611 and the one of the first friction surface 310 and the second friction surface 410 is larger than the included angle between the second side wall 612 and the one of the first friction surface 310 and the second friction surface 410, and the included angle between the first side surface 621 and the other of the first friction surface 310 and the second friction surface 410 is larger than the included angle between the second side surface 622 and the other of the first friction surface 310 and the second friction surface 410.

When the first friction face 310 rotates in one of the clockwise and counterclockwise directions relative to the second friction face 410, the protrusions 620 may disengage the grooves 610 due to the smaller curvature of the second side wall 612 and the second side surface 622 or the smaller angle of the second side wall 612 to the one of the first friction face 310 and the second friction face 410 and the smaller angle of the second side surface 622 to the other of the first friction face 310 and the second friction face 410, such that the first friction face 310 rotates in the one of the clockwise and counterclockwise directions relative to the second friction face 410.

When the first friction surface 310 rotates relative to the second friction surface 410 in the other one of the clockwise direction and the counterclockwise direction, the first friction member 30 and the second friction member 40 may be coupled together, that is, the groove 610 may catch the protrusion 620, due to the greater curvature of the first side wall 611 and the first side surface 621 or the greater included angle of the first side wall 611 and the one of the first friction surface 310 and the second friction surface 410, and the greater included angle of the first side surface 621 and the other one of the first friction surface 310 and the second friction surface 410, so that the first friction member 30 and the second friction member 40 may rotate synchronously.

This enables the blocking portion 60 to effectively block the rotation of the first friction surface 310 relative to the second friction surface 410 in the other of the clockwise direction and the counterclockwise direction.

Preferably, the protrusion 620 may be plural, the plural protrusions 620 may be provided at intervals in the circumferential direction of the rotation shaft 10, the plural grooves 610 may be provided, and the plural grooves 610 may be provided at intervals in the circumferential direction of the rotation shaft 10. Wherein the plurality of protrusions 620 can be fitted in the plurality of grooves 610 in a one-to-one correspondence.

It will be appreciated by those skilled in the art that tensioner 1 may also include an elastic member (e.g., a spring). The spring may be known and may be mounted in a known manner.

The body 20, the first friction member 30, the second friction member 40 and the base 50 (which may also include the third friction member) may thus be pressed together by the resilient member such that the pressing force between the first friction face 310 and the second friction face 410 is equal to the pressing force between the third friction face 420 and the fourth friction face 510.

Preferably, the coefficient of friction of the first friction surface 310 and the second friction surface 410 is less than the coefficient of friction of the third friction surface 420 and the fourth friction surface 510. Thereby, the first frictional force can be made smaller than the second frictional force, so that the structure of the tensioner 1 can be made more reasonable.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims (10)

1. A tensioner (1), characterized by comprising:

a body (20), the body (20) being rotatably arranged;

a first friction face (310) and a second friction face (410), the first friction face (310) being in contact with the second friction face (410), the first friction face (310) being rotatable relative to the second friction face (410) in one of a clockwise direction and a counter-clockwise direction so as to generate a first friction force, wherein at least one of the first friction face (310) and the second friction face (410) is provided with a stop (60) for stopping rotation of the first friction face (310) relative to the second friction face (410) in the other of the clockwise direction and the counter-clockwise direction; and

a third friction face (420) and a fourth friction face (510), the third friction face (420) in contact with the fourth friction face (510), the third friction face (420) rotatable relative to the fourth friction face (510) in the other of a clockwise direction and a counter-clockwise direction to generate a second friction force, wherein the second friction force is greater than the first friction force.

2. The tensioner (1) according to claim 1, characterized in that it comprises:

a rotating shaft (10);

the body (20), the body (20) is provided with a containing cavity (210), the containing cavity (210) is provided with a first wall surface (211), the first wall surface (211) is a peripheral wall surface or a bottom wall surface, and the body (20) is rotatably arranged relative to the rotating shaft (10);

a first friction member (30), wherein the first friction member (30) is fixedly arranged on the first wall surface (211) or the friction force between the first friction member (30) and the first wall surface (211) is larger than the second friction force, the first friction member (30) is provided with the first friction surface (310), and the first friction member (30) is sleeved on the rotating shaft (10);

a second friction member (40), wherein the second friction member (40) is arranged on the first friction member (30), the second friction member (40) is provided with a second friction surface (410) and a third friction surface (420), and the second friction member (40) is sleeved on the rotating shaft (10); and

a base (50), the base (50) is arranged on the second friction piece (40), and the base (50) is provided with the fourth friction surface (510).

3. The tensioner (1) according to claim 1, characterized in that it comprises:

a rotating shaft (10);

the body (20), the body (20) has a containing cavity (210), the containing cavity (210) has a first wall surface (211), the first wall surface (211) is a peripheral wall surface or a bottom wall surface, the first wall surface (211) is the first friction surface (310), wherein the body (20) is rotatably arranged relative to the rotating shaft (10);

the first friction piece (30), the first friction piece (30) is arranged on the first wall surface (211), the first friction piece (30) is provided with the second friction surface (410) and the third friction surface (420), and the first friction piece (30) is sleeved on the rotating shaft (10);

a second friction member (40), wherein the second friction member (40) is arranged on the first friction member (30), the second friction member (40) is provided with a fourth friction surface (510), and the second friction member (40) is sleeved on the rotating shaft (10); and

the base (50) is fixedly arranged on the second friction piece (40) or the friction force between the base (50) and the second friction piece (40) is larger than the second friction force.

4. The tensioner (1) according to claim 1, characterized in that it comprises:

a rotating shaft (10);

the body (20), the body (20) is provided with a containing cavity (210), the containing cavity (210) is provided with a first wall surface (211), the first wall surface (211) is a peripheral wall surface or a bottom wall surface, and the body (20) is rotatably arranged relative to the rotating shaft (10);

a first friction member (30), wherein the first friction member (30) is fixedly arranged on the first wall surface (211) or the friction force between the first friction member (30) and the first wall surface (211) is larger than the second friction force, the first friction member (30) is provided with the first friction surface (310), and the first friction member (30) is sleeved on the rotating shaft (10);

a second friction member (40), wherein the second friction member (40) is arranged on the first friction member (30), the second friction member (40) is provided with a second friction surface (410) and a third friction surface (420), and the second friction member (40) is sleeved on the rotating shaft (10);

a third friction member provided on the second friction member (40), the third friction member having the fourth friction surface (510), the third friction member being fitted on the rotating shaft (10); and

the base (50) is fixedly arranged on the third friction piece or the friction force between the base (50) and the third friction piece is larger than the second friction force.

5. The tensioner (1) according to claim 1, characterized in that it comprises:

a rotating shaft (10);

the body (20), the body (20) has a containing cavity (210), the containing cavity (210) has a first wall surface (211), the first wall surface (211) is a peripheral wall surface or a bottom wall surface, the first wall surface (211) is the first friction surface (310), wherein the body (20) is rotatably arranged relative to the rotating shaft (10);

the first friction piece (30), the first friction piece (30) is arranged on the first wall surface (211), the first friction piece (30) is provided with the second friction surface (410) and the third friction surface (420), and the first friction piece (30) is sleeved on the rotating shaft (10); and

a base (50), the base (50) is arranged on the first friction piece (30), and the base (50) is provided with the fourth friction surface (510).

6. The tensioner (1) of any one of claims 1-5, characterized in that the coefficient of friction of the first friction surface (310) with the second friction surface (410) is less than the coefficient of friction of the third friction surface (420) with the fourth friction surface (510).

7. The tensioner (1) of any one of claims 2-5, wherein the stop (60) comprises:

a groove (610), the groove (610) being provided on one of the first friction face (310) and the second friction face (410), the groove (610) having a first sidewall (611) and a second sidewall (612) opposed in a circumferential direction of the rotating shaft (10), the first sidewall (611) being located downstream of the second sidewall (612) in the other of the clockwise direction and the counterclockwise direction; and

a projection (620) fitted in the groove (610), the projection (620) being provided on the other of the first friction face (310) and the second friction face (410), the projection (620) having a first side face (621) and a second side face (622) opposed in a circumferential direction of the rotating shaft (10), wherein the first side face (621) is located downstream of the second side face (622) in the other of the clockwise direction and the counterclockwise direction,

wherein the curvature of the first sidewall (611) is greater than the curvature of the second sidewall (612), the curvature of the first side surface (621) is greater than the curvature of the second side surface (622),

or the first side wall (611) is at a greater angle to said one of the first friction surface (310) and the second friction surface (410) than the second side wall (612) is at a greater angle to said one of the first friction surface (310) and the second friction surface (410), and the first side surface (621) is at a greater angle to said other of the first friction surface (310) and the second friction surface (410) than the second side surface (622) is at said other of the first friction surface (310) and the second friction surface (410).

8. The tensioner (1) of claim 2 or 3, characterized in that each of the first friction member (30) and the second friction member (40) is flat plate-like or tubular.

9. A tensioning device (100), comprising:

a tensioner (1), said tensioner (1) being a tensioner (1) according to any one of claims 1-8;

a tension pulley (2) for abutting against the belt (200); and

the first end of the connecting piece (3) is connected with the body (20) of the tensioner (1), and the second end of the connecting piece (3) is connected with the tension wheel (2).

10. A drive system (1000), comprising:

a belt (200); and

tensioner (100), said tensioner (100) being a tensioner (100) according to claim 9, a tensioner pulley (2) of said tensioner (100) resting on a belt (200).

Images