CN112747091B

CN112747091B - REPS belt tensioner and vehicle

Info

Publication number: CN112747091B
Application number: CN201911046887.7A
Authority: CN
Inventors: 潘宗亮
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2019-10-30
Filing date: 2019-10-30
Publication date: 2022-07-15
Anticipated expiration: 2039-10-30
Also published as: CN112747091A

Abstract

The utility model relates to a REPS belt tightener and vehicle, this belt tightener includes the motor, the lead screw, band pulley reduction gears, including the little band pulley that is connected with the output shaft of motor, the big band pulley that is connected with the lead screw, and the belt of cover on little band pulley and big band pulley, the casing is used for sealing band pulley reduction gears, and set up the adjustment mechanism between little band pulley and big band pulley, adjustment mechanism is including setting up the back shaft in the adjustment hole of casing, connect the cylinder that is used for with belt looks butt on the back shaft, and the regulating part that is connected with the back shaft, the axial motion of regulating part drive back shaft in the adjustment hole, and drive the cylinder along the direction motion of being close to or keeping away from the belt. The adjusting part drives the supporting shaft to move outwards along the axial direction, so that the acting force of the roller on the belt can be reduced, the adjusting part drives the supporting shaft to move inwards along the axial direction, the acting force of the roller on the belt can be increased, the tensioning of the belt and the adjustment of the tensioning force are realized, and the operation is simple and rapid.

Description

REPS belt tensioner and vehicle

Technical Field

The disclosure relates to the field of automobile steering, in particular to a REPS belt tensioning device and a vehicle.

Background

A rack-assisted electric power steering (REPS) drives a rack to provide assistance through an assistance motor and a speed reducing mechanism so as to adjust the tension of a belt. However, the belt tensioning device in the form needs to be preassembled with a motor, the torque of the screw cannot be twisted in place, the motor needs to be kept still after the adjustment is finished, and the screw is locked finally, so that the process is complicated; and for a vehicle using for a long time, the belt is attenuated, the tension is not as good as that in the initial state, the belt is easy to slip or loose, the expected tension can be obtained only by keeping the belt immovably through pre-assembly fine adjustment, the assembly time is prolonged, and the risk of failure after durability exists.

Disclosure of Invention

A first object of the present disclosure is to provide a REPS belt tensioner which enables fine adjustment of a belt tension and is simple and quick to operate.

A second object of the present disclosure is to provide a vehicle that uses the REPS belt tensioner provided by the present disclosure.

In order to achieve the above object, the present disclosure provides a REPS belt tensioner comprising: the motor, the lead screw, band pulley reduction gears, include with the output shaft of motor be connected little band pulley, with big band pulley that the lead screw is connected, and the cover is established little band pulley with belt on the big band pulley, the casing is used for sealing band pulley reduction gears, and adjustment mechanism, set up in little band pulley with between the big band pulley, adjustment mechanism including set up in back shaft in the adjustment hole of casing, connect be used for on the back shaft with the cylinder of belt looks butt, and with the regulating part that the back shaft is connected, the regulating part drive the back shaft is in axial motion in the adjustment hole, and drive the cylinder is along being close to or keeping away from the direction motion of belt.

Optionally, threaded connection section has on the inner wall of regulation hole, the regulating part be with the nut that threaded connection section is connected, be formed with annular containing groove on the terminal surface of back shaft, adjustment mechanism still includes and is located connect in the annular containing groove the regulating part with the first elastic component of back shaft, the one end of first elastic component supports the top on the diapire of annular containing groove, the other end supports the top on the regulating part.

Optionally, the inner wall of the adjusting hole is further provided with a round hole section and a platform stage, an annular boss is formed on the outer peripheral wall of one end face of the supporting shaft, an accommodating hole is formed in the outer peripheral wall of the supporting shaft, the adjusting mechanism further comprises a second elastic piece located in the accommodating hole, one end of the second elastic piece abuts against the lower surface of the annular boss, and the other end of the second elastic piece abuts against the joint of the round hole section and the platform stage.

Optionally, the accommodating hole is multiple, and the second elastic element is arranged in each accommodating hole.

Optionally, the first elastic member is a metal spring, and the second elastic member is a rubber spring.

Optionally, the round hole section of the supporting shaft is sleeved with a first gasket.

Optionally, a second washer is sleeved on the adjusting piece, and/or a third washer is arranged between the adjusting piece and the supporting shaft.

Optionally, the other end of the supporting shaft is formed with a lifting lug which is arranged oppositely, and the two ends of the drum are fixed in the mounting holes of the lifting lug through bearings.

Optionally, a fastener for fixing the housing is further included.

According to a second aspect of the present disclosure, there is also provided a vehicle including the REPS belt tensioner described above.

Through the technical scheme, the regulating part drives the back shaft and outwards moves along the axial direction, the acting force of the roller on the belt can be reduced, the regulating part drives the back shaft and inwards moves along the axial direction, the acting force of the roller on the belt can be increased, the tensioning of the belt and the regulation of the tensioning force are realized, in addition, after the belt tensioning device is used for a long time, the REPS belt tensioning device provided by the disclosure can perform belt attenuation compensation, the reassembling is not needed, only the regulating part needs to be operated, and the operation is simple and fast.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure, but do not constitute a limitation of the disclosure. In the drawings:

FIG. 1 is a schematic representation of a prior art REPS belt tensioner;

FIG. 2 is a schematic illustration of a REPS belt tensioner provided by an exemplary embodiment of the present disclosure;

FIG. 3 is a cross-sectional view of a REPS belt tensioner provided in an exemplary embodiment of the present disclosure;

FIG. 4 is a schematic illustration of the structure of an adjustment mechanism in a REPS belt tensioner provided in an exemplary embodiment of the present disclosure;

FIG. 5 is a force analysis diagram of an adjustment mechanism in a REPS belt tensioner provided in an exemplary embodiment of the present disclosure;

FIG. 6 is an exploded view of an adjustment mechanism in a REPS belt tensioner provided in an exemplary embodiment of the present disclosure;

FIG. 7 is an exploded view of an adjustment mechanism in a REPS belt tensioner provided in an exemplary embodiment of the present disclosure;

FIG. 8 is a schematic diagram of a support shaft in a REPS belt tensioner provided by an exemplary embodiment of the present disclosure;

FIG. 9 is a schematic view of a housing in a REPS belt tensioner provided in an exemplary embodiment of the present disclosure.

Description of the reference numerals

1 motor 2 screw rod

31 small belt wheel and 32 large belt wheel

33 Belt 40 adjustment holes

41 threaded connection section 42 round hole section

43 step section 51 support shaft

52 roller 53 adjustment

54 first elastic member 55 second elastic member

61 first washer 62 second washer

63 third washer 7 fastener

511 ring-shaped accommodating groove 512 ring-shaped boss

513 receiving hole 514 lug

8 mounting case

Detailed Description

The following detailed description of the embodiments of the disclosure refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

In the present disclosure, unless stated to the contrary, use of directional terms such as "upper", "lower", "top" and "bottom" generally refer to those defined with respect to normal installation of the REPS belt tensioner provided by the present disclosure, and specifically with reference to the drawing directions shown in fig. 2, "inner" and "outer" refer to the inner and outer of the profile of the respective component, and "axial" and "circumferential" refer to the axial direction relative to the respective component. Furthermore, the terms "first," "second," and the like, as used in this disclosure, are intended to distinguish one element from another, and not necessarily for order or importance. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated.

As shown in fig. 1, in the conventional REPS belt tensioning device, in order to ensure that a motor 1 needs to be preassembled and a screw torque cannot be twisted in place, the rotating motor 1 adjusts the belt tensioning force, the motor 1 needs to be fixed after the adjustment is completed, the screw torque is finally tightened, if the motor 1 rotates in the screw tightening process, the motor 1 needs to be readjusted to ensure that the belt 33 is tensioned, and the process is complicated and complicated; in addition, after long-time use, the tensile force of the belt 33 is attenuated, so that the phenomenon of slipping or loosening is easy to occur, and the conventional REPS belt tensioning device has the risk of failure after durability.

In order to solve the above problems, as shown in fig. 2 to 6, the present disclosure provides a REPS belt tensioning device, comprising a motor 1, a screw rod 2, a pulley decelerating mechanism, a housing 4 and an adjusting mechanism, wherein the pulley decelerating mechanism comprises a small pulley 31 connected to an output shaft of the motor 1, a large pulley 32 connected to the screw rod 2, and a belt 33 sleeved on the small pulley 31 and the large pulley 32, wherein a diameter of the large pulley 32 is relatively larger than a diameter of the small pulley 31, the screw rod 2 is connected to a knuckle arm, and therefore can only be connected to the large pulley 32 with a larger diameter, the housing 4 is used for enclosing the pulley decelerating mechanism, the adjusting mechanism is disposed between the small pulley 31 and the large pulley 32 and close to the large pulley 32, the adjusting mechanism is integrally installed in an adjusting hole 40 of the housing 4, the adjusting mechanism comprises a supporting shaft 51 disposed in the adjusting hole 40, a roller 52 connected to the supporting shaft 51 for abutting against the belt 33, and an adjusting member 53 connected to the supporting shaft 51, wherein the adjusting member 53 drives the supporting shaft 51 to move axially in the adjusting hole 40 and drives the roller 52 to move in a direction approaching or moving away from the belt 33. The contact of the roller 52 on the belt 33 means that the curved surface of the roller 52 is in line contact with the belt 33, the housing 4 is fixed on the housing of the motor 1 by a fastening member 7, such as a screw, the housing 4 is formed with a cylinder protruding outward, the center hole of the cylinder is vertically penetrated with the mounting hole on the housing 4, that is, the center hole of the cylinder is formed as the adjusting hole 40, and the adjusting member 53 drives the supporting shaft 51 to drive the roller 52 to move up and down along the axial direction of the cylinder. When the REPS belt tensioning device provided by the disclosure is assembled, the motor 1 and the screw rod 2 are installed in the installation shell 8, the belt 33 is sleeved on the small belt wheel 31 and the large belt wheel 32, the shell 4 is installed, the fastening piece 7 is locked, the adjusting mechanism is installed, the roller 52 compresses the belt 33, the acting force of the roller 52 on the belt 33 is adjusted by operating the adjusting piece 53, and the tensioning of the belt 33 and the adjustment of the tensioning force are realized.

Through the technical scheme, the adjusting part 53 drives the supporting shaft 51 to move outwards along the axial direction, the acting force exerted on the belt 33 by the roller 52 can be reduced, the adjusting part 53 drives the supporting shaft 51 to move inwards along the axial direction, the acting force exerted on the belt 33 by the roller 52 can be increased, the tensioning of the belt 33 and the adjustment of the tensioning force are realized, in addition, after the REPS belt tensioning device provided by the disclosure is used for a long time, the belt attenuation compensation can be carried out, the reassembling is not needed, only the adjusting part 53 needs to be operated, and the operation is simple and fast.

The connection of the adjustment member 53 and the adjustment hole 40 and the connection of the adjustment member 53 and the support shaft 51 may be any suitable structure. In the present disclosure, as shown in fig. 7 and 8, the inner wall of the adjusting hole 40 has a threaded connection section 41, the adjusting member 53 is a nut connected to the threaded connection section 41, an end surface of the supporting shaft 51 is formed with an annular accommodating groove 511, the adjusting mechanism further includes a first elastic member 54 located in the annular accommodating groove 511 and connecting the adjusting member 53 and the supporting shaft 51, as shown in fig. 4 and 5, one end of the first elastic member 54 abuts against a bottom wall of the annular accommodating groove 511, and the other end abuts against the adjusting member 53. In this embodiment, a receiving groove abutting against the first elastic member 54 is also formed on the bottom wall of the adjusting member 53, a nut head convenient for an operator to operate is further formed on the top wall, and two ends of the first elastic member 54 can be respectively and fixedly connected in the adjusting member 53 and the annular receiving groove 511, that is, the adjusting member 53 and the supporting shaft 51 are indirectly connected through the first elastic member 54, so that fine adjustment of the tension of the belt 33 can be realized. By designing the depth of the threaded connection of the adjustment member 53 and the adjustment hole 40, different torques can be achieved to meet the adjustment requirement of the tension of the belt 33.

As shown in fig. 8 and 9, the inner wall of the adjusting hole 40 further has a circular hole section 42 and a step section 43, the outer peripheral wall of one end face of the supporting shaft 51 is formed with an annular boss 512, the outer peripheral wall of the supporting shaft 51 is formed with an accommodating hole 513, the adjusting mechanism further includes a second elastic member 55 located in the accommodating hole 513, as shown in fig. 4 and 5, one end of the second elastic member 55 abuts against the lower surface of the annular boss 512, and the other end abuts against the connection between the circular hole section 42 and the step section 43. The roller 52 presses the belt 33, the belt 33 applies a force f3 to the roller 52, and when the adjusting member 53 is screwed, the first elastic member 54 is compressed by the force f1 until the lower end face of the adjusting member 53 contacts the upper end face of the supporting shaft 51, the supporting shaft 51 moves in the axial direction, and the second elastic member 55 is compressed, and the force of the roller 52 on the belt 33 increases; in contrast, when the adjusting member 53 is reversely screwed, the adjusting member 53 and the supporting shaft 51 are gradually separated, and the supporting shaft 51 is moved outward in the axial direction by the restoring force f2 of the second elastic member 55, and the force of the roller 52 acting on the belt 22 is reduced, thereby completing the adjustment process of the tension of the belt 33.

Further, in the present disclosure, as shown in fig. 8, the receiving hole 513 may be a semi-cylindrical hole, the first elastic member 54 may be a metal spring, the second elastic member 55 may be a rubber spring, and the second elastic member 55 is disposed in the semi-cylindrical hole and filled between the supporting shaft 51 and the inner wall of the adjusting hole 40, so that the gap expansion abnormal noise can be eliminated. Further, the accommodating hole 513 may be multiple, and the second elastic member 55 is disposed in each accommodating hole 513, and specifically, in the present embodiment, the accommodating holes 513 are disposed oppositely, so that the supporting shaft 51 is prevented from shifting, jamming and stopping during the axial movement.

As shown in fig. 4 and 8, the circular hole section 42 of the supporting shaft 51 is sleeved with a first washer 61, such as an O-shaped rubber ring, which can eliminate the gap between the supporting shaft 51 and the inner wall of the adjusting hole 40. The adjusting piece 53 is sleeved with a second gasket 62, such as an O-shaped rubber ring, so that a gap between the adjusting piece 53 and the inner wall of the adjusting hole 40 can be eliminated, and a third gasket 63, such as a rubber flat gasket, is arranged between the adjusting piece 53 and the supporting shaft 51, so that abnormal noise caused by collision can be prevented.

The roller 52 is rotatably connected to one end of the supporting shaft 51, as shown in fig. 7, the other end of the supporting shaft 51 is formed with oppositely arranged hanging lugs 514, the two ends of the roller 52 are fixed in the mounting holes of the hanging lugs 514 through bearings 56, the roller 52 moves in a direction close to the belt 33 to increase the belt tension, or moves in a direction away from the belt 33 to decrease the belt tension, the roller 52 can rotate along with the belt 33 and ensure that the belt 33 is not loosened.

According to a second aspect of the present disclosure, there is also provided a vehicle comprising the REPS belt tensioner introduced above. The vehicle has all the benefits of the REPS belt tensioner described above and will not be described in further detail herein.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that, in the above embodiments, the various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations will not be further described in the present disclosure.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims

1. A REPS belt tensioner, comprising:

a motor (1) is arranged on the base,

a screw rod (2),

the belt wheel speed reducing mechanism comprises a small belt wheel (31) connected with an output shaft of the motor (1), a large belt wheel (32) connected with the screw rod (2), and a belt (33) sleeved on the small belt wheel (31) and the large belt wheel (32),

a housing (4) for enclosing the pulley reduction mechanism, and

the adjusting mechanism is arranged between the small belt wheel (31) and the large belt wheel (32) and comprises a supporting shaft (51) arranged in an adjusting hole (40) of the shell (4), a roller (52) connected to the supporting shaft (51) and used for being abutted to the belt (33), and an adjusting piece (53) connected with the supporting shaft (51), wherein the adjusting piece (53) drives the supporting shaft (51) to axially move in the adjusting hole (40) and drives the roller (52) to move in a direction close to or far away from the belt (33);

the inner wall of the adjusting hole (40) is provided with a threaded connecting section (41), the adjusting piece (53) is a nut connected with the threaded connecting section (41), an annular accommodating groove (511) is formed in one end face of the supporting shaft (51), the adjusting mechanism further comprises a first elastic piece (54) which is positioned in the annular accommodating groove (511) and is connected with the adjusting piece (53) and the supporting shaft (51), one end of the first elastic piece (54) abuts against the bottom wall of the annular accommodating groove (511), and the other end of the first elastic piece abuts against the adjusting piece (53);

the inner wall of the adjusting hole (40) is further provided with a round hole section (42) and a platform stage (43), an annular boss (512) is formed on the outer peripheral wall of one end face of the supporting shaft (51), an accommodating hole (513) is formed on the outer peripheral wall of the supporting shaft (51), the adjusting mechanism further comprises a second elastic piece (55) located in the accommodating hole (513), one end of the second elastic piece (55) abuts against the lower surface of the annular boss (512), and the other end of the second elastic piece abuts against the joint of the round hole section (42) and the platform stage (43).

2. The REPS belt tensioner as claimed in claim 1, wherein the receiving hole (513) is plural, the second resilient member (55) being provided in each receiving hole (513).

3. The REPS belt tensioner as claimed in claim 1, wherein the first resilient member (54) is a metal spring and the second resilient member (55) is a rubber spring.

4. The REPS belt tensioner as claimed in claim 1, characterized in that a first washer (61) is sleeved on the circular bore section (42) of the support shaft (51).

5. The REPS belt tensioner according to claim 4, characterized in that a second washer (62) is sleeved on the adjusting piece (53) and/or a third washer (63) is arranged between the adjusting piece (53) and the support shaft (51).

6. The REPS belt tensioner according to claim 1, characterized in that the other end of the support shaft (51) is formed with oppositely disposed lugs (514), and both ends of the drum (52) are fixed in mounting holes of the lugs (514) by bearings (56).

7. The REPS belt tensioner as claimed in claim 1, further comprising a fastener (7) for securing the housing (4).

8. A vehicle, characterized in that it comprises a REPS belt tensioner according to any of claims 1 to 7.