CN220268329U

CN220268329U - Tensioner for vehicle

Info

Publication number: CN220268329U
Application number: CN202321919786.8U
Authority: CN
Inventors: 丁凯
Original assignee: SAIC Motor Corp Ltd
Current assignee: SAIC Motor Corp Ltd
Priority date: 2023-07-19
Filing date: 2023-07-19
Publication date: 2023-12-29
Anticipated expiration: 2033-07-19

Abstract

The utility model discloses a tensioner for a vehicle, which comprises a base, a tension rod and a tension rod, wherein the base is fixedly connected with an engine; the connecting shaft penetrates through the center hole and can rotate around the center hole, the swing arm is located at the first axial end of the base, the torsion spring is circumferentially limited and installed between the swing arm and the base, and the torsion spring is in a torsion state so as to provide circumferential torque; the axial damping unit is located at the axial second end of the base and comprises a tray, an elastic component and a damping piece, the tray is detachably connected to the connecting shaft, the elastic component is abutted to the tray, and the damping piece is pressed on the base. According to the vehicle tensioner disclosed by the utility model, the independent adjustable axial damping unit is additionally arranged, when the belt tension changes, the swing arm swings or the swing trend occurs, damping force is generated between the damping piece and the base, the swing of the swing arm is restrained, the damping is not influenced by the structural size any more, and the damping force is adjustable and controllable.

Description

Tensioner for vehicle

Technical Field

The utility model relates to the technical field of vehicles, in particular to a vehicle tensioner.

Background

The accessory tensioner is the most important component of the accessory transmission system at the front end of the engine, is usually arranged on an engine cylinder body, a front cover or a transition bracket and is used for tensioning an accessory transmission belt and providing stable and continuous tension for the belt system, so that the problems of belt slipping, abnormal sound and the like caused by the fact that the belt is extended and worn after being used for a period of time are prevented.

The prior art tensioner for vehicles, as shown in fig. 1 and 2, generates positive pressure by pressing the inner wall of the base 3 'through the damping block 2' by virtue of the fact that the outer diameter of the spring is enlarged when the internal torsion spring 1 'rotates, thereby generating damping force and restraining the swing of the swing arm 4'.

However, the vehicle tensioner in the prior art is limited by a structure, damping is simultaneously influenced by a plurality of sizes such as the outer diameter of a torsion spring, a damping block or a damping ring, the inner diameter of a base and the like, the damping fluctuation range is large, and the tolerance can only be controlled to be +/-20%.

Disclosure of Invention

The utility model aims to provide a tensioner for a vehicle, which is not influenced by structural dimensions and solves the problem of large damping fluctuation range in the prior art.

In order to solve the above technical problems, the present utility model provides a tensioner for a vehicle, comprising:

the base is used for being fixedly connected with the engine, and a central hole which is axially communicated is formed in the middle of the base;

the connecting shaft penetrates through the inside of the central hole and can rotate around the central hole, the swing arm is located at the first axial end of the base, the torsion spring is circumferentially and limitedly arranged between the swing arm and the base, and the torsion spring is in a pretensioned state so as to provide circumferential torque;

the axial damping unit is located the axial second end of base, including tray, elastomeric element and damping piece, tray detachably connect in the connecting axle, elastomeric element with the tray butt, and follow the axial with the damping piece compress tightly in the base.

The utility model provides a vehicle tensioner, which provides a brand new damping force generation mode, wherein a torsion spring is arranged between a swing arm and a base, is not used for extruding a damping structure to generate damping force, and is only used for circumferential torque, namely, the torsion spring and the base are only provided with a torsion force generation structure; meanwhile, an independent adjustable axial damping unit is additionally arranged, the tray axially extrudes the elastic component to generate positive pressure, the elastic component compresses the damping component on the base, and when the belt tension changes, the swing arm swings or has a tendency of swinging, damping force can be generated between the damping component and the base to inhibit swinging of the swing arm.

Therefore, the vehicle tensioner disclosed by the utility model has the advantages that the generation mode and the action position of damping are adjusted, the generation of damping is not influenced by a plurality of structural dimensions such as the outer diameter of the torsion spring, the damping structure, the inner diameter of the base and the like, the damping force is stable, the problem that abnormal sound is possibly generated due to a large damping fluctuation range in the prior art is solved, and the user experience is good.

In addition, the tray is connected to the connecting shaft, and can be detached, namely axial damping units and bases are mutually independent, each vehicle tensioner can be matched with a plurality of axial damping units, the quantity and basic size design of elastic components in each axial damping unit are adjusted, the axial force generated by the elastic components is also different, and further the adjustable and controllable damping force generated by the axial damping units is realized.

Optionally, the end part of the connecting shaft is provided with a threaded connecting hole with internal threads, the threaded connecting hole comprises a first hole section and a second hole section which are axially connected, the second hole section is close to the open end, the diameter of the second hole section is larger than that of the first hole section, and a first step surface is formed between the first hole section and the second hole section;

the periphery wall of the protruding shaft is provided with matched external threads, the protruding shaft comprises a first diameter section and a second diameter section which are axially connected, the first diameter section is close to the free end, the diameter of the second diameter section is larger than that of the first diameter section, and a second step surface is formed between the first diameter section and the second diameter section;

in the installation state, the first diameter section is in threaded connection with the first hole section, the second diameter section is connected with the second hole Duan Luowen, and the first step surface is in butt joint with the second step surface.

Optionally, the middle part of tray is provided with protruding axle, connecting axle with in the protruding axle, one is provided with the internal thread, and another week wall is provided with assorted external screw thread, both threaded connection.

Optionally, the tray is provided with an annular receiving groove at an outer circumference of the protruding shaft, an inner end of the annular receiving groove is opened and extends outward, and the elastic member is installed inside the annular receiving groove.

Optionally, the axial damping unit further comprises an annular thrust plate, the annular thrust plate is mounted between the elastic component and the damping piece, and the annular thrust plate is in limit connection with the tray in the circumferential direction.

Optionally, the annular holding groove is provided with the breach in the open end, the breach runs through the inner wall of annular holding groove to radially outwards extend, annular thrust piece corresponds and is provided with the protruding portion, annular thrust piece installs annular holding groove is inside, protruding portion one-to-one is located inside the breach.

Optionally, the axial second end of the base is provided with a first accommodation groove, and the axial damping unit is located inside the first accommodation groove.

Optionally, an inner end wall of the first accommodating groove is provided with an annular protrusion, and the damping piece is abutted with the annular protrusion.

Optionally, the torsion spring has a first end and a second end, the base has a first abutment wall, the swing arm has a second abutment wall, in the installed state, the first end and the first abutment wall abut, the second end and the second abutment wall abut, and the torsion spring is in a pretensioned state.

Optionally, the first axial end of the base is provided with a second accommodating groove, and the torsion spring is located inside the second accommodating groove.

Drawings

FIG. 1 is a schematic structural view of a first embodiment of a prior art vehicle tensioner;

FIG. 2 is a schematic diagram of a second embodiment of a prior art vehicular tensioner;

FIG. 3 is a schematic view of an embodiment of a vehicle tensioner according to the present utility model;

FIG. 4 is an axial cross-sectional view of the vehicle tensioner of FIG. 3;

FIG. 5 is a schematic view of the construction of the belleville springs in the vehicle tensioner of FIG. 3;

FIG. 6 is a schematic view of the disk spring of FIG. 5 in axial cross-section;

FIG. 7 is a cross-sectional view of the belleville spring of FIG. 5 having a support surface;

FIG. 8 is a cross-sectional view of the Belleville spring of FIG. 5 without a support surface;

FIG. 9 is a graph of the performance of a single belleville spring;

FIG. 10 is a graph showing the load carrying capacity and characteristics of various combinations of multiple belleville springs;

wherein reference numerals in fig. 1-2 are described as follows:

a 1' -torsion spring; 2' -damping block; a 3' -base; 4' -swing arm;

wherein reference numerals in fig. 3-4 are illustrated as follows:

1-a base; 1 a-a first receiving groove; 1 b-a second receiving groove; a-annular protrusions; 11-connecting lugs;

21-a swing arm; 22-connecting shaft;

3-torsion springs;

4-an axial damping unit; 41-a tray; 411-protruding shaft; 41 a-an annular receiving groove; 41 b-a limiting hole; 42-an elastic member; 43-damping member; 44-annular thrust plate;

5-self-lubricating shaft sleeve.

Detailed Description

In order to make the technical solution of the present utility model better understood by those skilled in the art, the present utility model will be further described in detail with reference to the accompanying drawings and specific embodiments.

The term "plurality" as used herein is typically more than two; and when "a plurality" is used to denote the number of a certain number of components, the number of components is not necessarily related to each other.

Herein, the extending direction along the connecting shaft 22 is the "axial direction".

Herein, the side of the tray 41 facing the base 1 is "inside", and the side facing away from the base 1 is "outside".

Referring to fig. 3 and 4, fig. 3 is a schematic structural view of an embodiment of a tensioner for a vehicle according to the present utility model; fig. 4 is an axial cross-sectional view of the vehicle tensioner of fig. 3.

The present utility model provides a tensioner for a vehicle, comprising:

the engine comprises a base 1, wherein the base 1 is fixedly connected with an engine, and a central hole which is axially communicated is formed in the middle of the base 1;

the swing arm 21, the connecting shaft 22 and the torsion spring 3, wherein the swing arm 21 and the connecting shaft 22 are fixedly connected, the connecting shaft 22 penetrates through the inside of the central hole and can rotate around the central hole, the swing arm 21 is positioned at the first axial end of the base 1, the torsion spring 3 is circumferentially and limitedly arranged between the swing arm 21 and the base 1, and the torsion spring 3 is in a pretensioned state to provide circumferential torque;

the axial damping unit 4 is located at the axial second end of the base 1, the axial damping unit 4 comprises a tray 41, an elastic component 42 and a damping piece 43, the tray 41 is detachably connected to the connecting shaft 22, and the elastic component 42 is abutted to the tray 41 and presses the damping piece 43 to the base 1.

The utility model provides a vehicle tensioner, which provides a brand new damping force generation mode, wherein a torsion spring 3 is arranged between a swing arm 21 and a base 1, is not used for extruding a damping structure to generate damping force, and is only used for generating circumferential torque, namely, only a torsion force generation structure is arranged among the swing arm 21, the torsion spring 3 and the base 1; meanwhile, an independent adjustable axial damping unit 4 is additionally arranged, the tray 41 axially presses the elastic component 42 to generate positive pressure, the elastic component 42 presses the damping component 43 to the base 1, and when the belt tension changes, the swing arm 21 swings or has a tendency of swinging, damping force is generated between the damping component 43 and the base 1 to restrain swinging of the swing arm 21.

In addition, the tray 41 is connected to the connecting shaft 22, and is detachable, that is, the axial damping units 4 are independent of the base 1, each vehicle tensioner can be matched with a plurality of axial damping units 4, the number and basic size of the elastic components 42 in each axial damping unit 4 are adjusted, the axial force generated by the elastic components 42 can be different, and further the adjustable and controllable damping force generated by the axial damping units 4 is realized.

As shown in fig. 3 and fig. 4, the swing arm 21 and the connecting shaft 22 are in a split structure and are fixed into a whole, the second end of the connecting shaft 22 is provided with a turnover edge extending outwards, the second end of the central hole is provided with a counter bore, the connecting shaft 22 passes through the central hole in the middle of the base 1, the turnover edge is positioned in the counter bore, the first end of the connecting shaft 22 is connected with the swing arm 21, the connection mode is not limited, if the swing arm 21 is correspondingly provided with a connecting hole, and the connecting shaft 22 is in interference fit with the connecting hole.

The specific structure of the elastic member 42 is not limited, for example, the elastic member 42 may include one or more coil springs, and when the number of coil springs is plural, the plural coil springs are distributed circumferentially, and the coil springs are abutted against the tray 41 and compress the damping member 43 against the base 1 in the axial direction.

Referring to fig. 4-10, fig. 5 is a schematic view of the belleville spring in the vehicle tensioner of fig. 3; FIG. 6 is a schematic view of the disk spring of FIG. 5 in axial cross-section; FIG. 7 is a cross-sectional view of the belleville spring of FIG. 5 having a support surface; FIG. 8 is a cross-sectional view of the Belleville spring of FIG. 5 without a support surface; FIG. 9 is a graph of the performance of a single belleville spring; FIG. 10 shows the load carrying capacity and characteristics of various combinations of multiple belleville springs.

In this embodiment, the elastic member 42 includes a plurality of disc springs. The disc spring is named as a bowl-like disc-shaped disc spring for short, is usually made of spring steel, and is made of 60Si2MnA and 50CrVA, quenching and tempering are needed after the disc spring is molded, and the surface of the disc spring is also subjected to corrosion prevention. The disc spring mainly bears axial load, the load is uniformly distributed on the inner edge of the upper surface and the outer edge of the lower surface, static load and dynamic alternating load can be borne, the stroke of the disc spring is short, the deformation is small, the bearing capacity is large, the space utilization rate is high, and the maintenance and the replacement are easy.

As shown in FIGS. 7 and 8, the main dimensional parameters of the belleville springs include an outer diameter D, an inner diameter D, a thickness t, and a height H ₀ F is the deformation, h ₀ For maximum deflection, F is the axial force, F _C Is the axial force when the spring is pressed, D ₀ Is the effective radius of damping friction force. In practical application, different axial forces can be obtained by changing the thickness t, the inner diameter D, the outer diameter D and the like of the disc spring, so that the damping force is changed; or the compression height of the disc spring is controlled, so that the axial force of the disc spring is changed, and different damping forces are obtained; or by increasing the effective radius D of damping friction of the belleville springs ₀ Resistance torque is improved.

As shown in fig. 9 and 10, different load carrying capacities and characteristic curves can be obtained by changing the number of disc springs or the combination of disc springs. Therefore, in practical application, different axial forces can be obtained by changing the number of the disc springs, so that the damping force is changed; different axial forces are obtained through different combination modes of a plurality of disc springs, and the damping force is changed.

With continued reference to fig. 4, the tray 41 is connected to the connection shaft 22 and is detachable, and in this embodiment, a protruding shaft 411 is provided at the middle of the tray 41, an internal thread is provided at the free end of the connection shaft 22, a matched external thread is provided on the peripheral wall of the protruding shaft 411, and the protruding shaft 411 is screwed with the connection shaft 22.

Thus, by twisting the protruding shaft 411, the position of the tray 41 connected to the connecting shaft 22 can be adjusted, the distance between the tray 41 and the end wall of the base 1 can be adjusted, the compression amount of the elastic member 42 can be changed, and the axial force generated by the elastic member 42 can be further changed, so that the damping force generated by the axial damping unit 4 can be adjusted. Alternatively, the damping force can be adjusted by increasing or decreasing the number of elastic members 42 by adjusting the distance between the tray 41 and the end wall of the base 1.

Of course, in practical application, the protruding shaft 411 and the connecting shaft 22 may be screwed, or the free end of the protruding shaft 411 may be provided with an internal thread, and the peripheral wall of the connecting shaft 22 may be provided with a matched external thread.

With continued reference to fig. 4, in this embodiment, the end of the connecting shaft 22 is provided with a threaded connection hole having an internal thread, the threaded connection hole includes a first hole section and a second hole section axially connected, the second hole section is close to the open end, the diameter of the second hole section is larger than that of the first hole section, and a first step surface is formed between the first hole section and the second hole section;

the peripheral wall of the protruding shaft 411 is provided with matched external threads, the protruding shaft 411 comprises a first diameter section and a second diameter section which are axially connected, the first diameter section is close to the free end, the diameter of the second diameter section is larger than that of the first diameter section, and a second step surface is formed between the first diameter section and the second diameter section;

in the installation state, the first diameter section is in threaded connection with the first hole section, the second diameter section is in threaded connection with the second hole Duan Luowen, and the first step surface and the second step surface are in mutual abutting connection.

In this way, the relative rotation between the connection shaft 22 and the protruding shaft 411 is prevented by the abutting action of the first step surface and the second step surface, and the tray 41 is prevented from being separated from the connection shaft 22.

In addition, the outer wall of the tray 41 is processed with a limiting hole 41b, and the shape of the limiting hole 41b is not limited, for example, a hexagonal hole, a triangular hole, a cross hole and the like, when the axial damping unit 4 is dismounted, a dismounting tool is inserted into the limiting hole 41b to realize circumferential limiting, and the axial damping unit 4 can be mounted on the connecting shaft 22 or dismounted by twisting the dismounting tool. The dismounting tool can be a screwdriver and the like.

With continued reference to fig. 4, the tray 41 is provided with an annular receiving groove 41a at the outer periphery of the protruding shaft 411, and an open end of the annular receiving groove 41a penetrates an inner wall of the tray 41, i.e., an inner end of the annular receiving groove 41a is open and extends outward, and the elastic member 42 is installed inside the annular receiving groove 41 a.

As described above, the annular accommodating groove 41a can position not only the elastic member 42, but also when the elastic member 42 is a disc spring, it is possible to realize mounting of a disc spring having a larger effective radius with a large and stable damping force by this structure.

Further, the axial damping unit 4 further includes an annular thrust plate 44, the annular thrust plate 44 is installed between the elastic member 42 and the damping member 43, and the annular thrust plate 44 is in circumferential limit connection with the tray 41.

In this way, the elastic member 42 may contact the damper 43 through the annular thrust piece 44, ensuring that the positive pressure of the elastic member 42 acts uniformly on the damper 43.

As shown in fig. 3 and 4, the annular accommodating groove 41a is provided with a notch at an open end, the notch penetrates through an inner wall of the annular accommodating groove 41a and extends radially outwards, the annular thrust plate 44 is correspondingly provided with a protruding portion, the annular thrust plate 44 is mounted inside the annular accommodating groove 41a, and the protruding portions are located inside the notch in a one-to-one correspondence manner, so that circumferential limitation of the annular thrust plate 44 is achieved.

As can be seen from fig. 3, in this embodiment, the number of the protruding portions of the annular thrust plate 44 is four, and the four protruding portions are uniformly distributed along the circumferential direction, that is, the included angle between two adjacent protruding portions is 90 °, and the number of the corresponding notches of the annular accommodating groove 41a is also four. In practical application, the number of the protruding parts and the notches is not limited, for example, the number of the protruding parts and the notches can be at least one, and the protruding parts and the notches are in one-to-one correspondence.

With continued reference to fig. 4, the axial second end of the base 1 is provided with a first accommodating groove 1a, and the axial damping unit 4 is mounted inside the first accommodating groove 1 a.

As set forth above, the first accommodating groove 1a forms an installation space of the axial damping unit 4, on one hand, the overall structure is more compact, the axial dimension of the vehicle tensioner is reduced, and the space occupation is reduced; on the other hand, the first accommodating groove 1a forms a protective effect on the axial damping unit 4, so that when the installation position of the vehicle tensioner is low, pollutants such as water, oil, sediment and the like are prevented from entering the axial damping unit 4, abnormal sound is caused, and even the vehicle tensioner is blocked, so that the normal use of the vehicle tensioner is ensured.

Further, the inner end wall of the first accommodation groove 1a is provided with an annular projection a with which the damper 43 abuts.

Further, the torsion spring 3 has a first end and a second end, the base 1 has a first abutment wall, the swing arm 21 has a second abutment wall, the first end abuts against the first abutment wall in the mounted state, the second end abuts against the second abutment wall, and the torsion spring 3 is in the pretensioned state.

In this way, the swing arm 21 is in circumferential abutment with the base 1 through the torsion spring 3, and when the swing arm 21 swings, the outer diameter of the torsion spring 3 gradually increases, generating circumferential torque; when the swing arm 21 returns to the initial position, the torsion spring 3 is released and its outer diameter gradually decreases.

As can be seen from fig. 4, the first axial end of the base 1 is further provided with a second receiving groove 1b, and the torsion spring 3 is located inside the second receiving groove 1 b.

In addition, referring to fig. 3, in this embodiment, the base 1 is further provided with two radially extending connecting lugs 11, and the free ends of the connecting lugs 11 are provided with connecting holes for the connecting pieces to pass through for fixedly connecting with the engine.

In addition, referring to fig. 3 and 4, in the present embodiment, the vehicle tensioner further includes a self-lubricating sleeve 5 sleeved inside the central hole, and the outer periphery of the connecting shaft 22, so as to improve the smoothness of rotation of the connecting shaft 22 relative to the central hole.

The foregoing has outlined rather broadly the principles and embodiments of the present utility model in order that the detailed description of the utility model that follows may be better understood, and in order that the present utility model may be better understood. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the utility model can be made without departing from the principles of the utility model and these modifications and adaptations are intended to be within the scope of the utility model as defined in the following claims.

Claims

1. A tensioner for a vehicle, comprising:

the engine comprises a base (1), wherein the base (1) is fixedly connected with an engine, and a central hole which is axially communicated is formed in the middle of the base (1);

the device comprises a swing arm (21), a connecting shaft (22) and a torsion spring (3), wherein the swing arm (21) is fixedly connected with the connecting shaft (22), the connecting shaft (22) penetrates through the center hole and can rotate around the center hole, the swing arm (21) is positioned at the first axial end of the base (1), the torsion spring (3) is circumferentially limited and installed between the swing arm (21) and the base (1), and the torsion spring (3) is in a pretensioned state so as to provide circumferential torque;

the axial damping unit (4) is located at the axial second end of the base (1), the axial damping unit (4) comprises a tray (41), an elastic component (42) and a damping piece (43), the tray (41) is detachably connected to the connecting shaft (22), the elastic component (42) is abutted to the tray (41), and the damping piece (43) is pressed on the base (1) along the axial direction.

2. The tensioner of claim 1, wherein the middle portion of the tray (41) is provided with a protruding shaft (411), one of the connecting shaft (22) and the protruding shaft (411) is provided with an internal thread, and the other peripheral wall is provided with a matching external thread, and the two are in threaded connection.

3. The tensioner of claim 2, wherein the end of the connecting shaft (22) is provided with a threaded connection hole having an internal thread, the threaded connection hole comprising a first hole section and a second hole section axially connected, the second hole section being adjacent to the open end, the second hole section having a diameter greater than the diameter of the first hole section, a first step surface being formed between the first hole section and the second hole section;

the peripheral wall of the protruding shaft (411) is provided with matched external threads, the protruding shaft (411) comprises a first diameter section and a second diameter section which are axially connected, the first diameter section is close to the free end, the diameter of the second diameter section is larger than that of the first diameter section, and a second step surface is formed between the first diameter section and the second diameter section;

4. The tensioner of claim 2, wherein the tray (41) is provided with an annular receiving groove (41 a) at an outer periphery of the protruding shaft (411), an inner end of the annular receiving groove (41 a) is opened and extends outward, and the elastic member (42) is installed inside the annular receiving groove (41 a).

5. The tensioner of claim 4, wherein the axial damping unit (4) further comprises an annular thrust plate (44), the annular thrust plate (44) being mounted between the elastic member (42) and the damping member (43), and the annular thrust plate (44) being in circumferential limit connection with the pallet (41).

6. The tensioner of claim 5, wherein the annular receiving groove (41 a) is provided with a notch at an open end, the notch penetrates through an inner wall of the annular receiving groove (41 a) and extends radially outwards, the annular thrust plate (44) is correspondingly provided with a protruding portion, the annular thrust plate (44) is mounted inside the annular receiving groove (41 a), and the protruding portions are located inside the notch one by one.

7. The vehicle tensioner according to any of claims 1 to 6, characterized in that the second axial end of the base (1) is provided with a first housing groove (1 a), the axial damping unit (4) being located inside the first housing groove (1 a).

8. The tensioner of claim 7, wherein the inner end wall of the first receiving groove (1 a) is provided with an annular protrusion (a), and the damping member (43) abuts against the annular protrusion (a).

9. The vehicle tensioner according to any one of claims 1 to 6, characterized in that the torsion spring (3) has a first end and a second end, the base (1) has a first abutment wall, the swing arm (21) has a second abutment wall, in the mounted state, the first end and the first abutment wall abut, the second end and the second abutment wall abut, and the torsion spring (3) is in a pretensioned state.

10. The vehicle tensioner according to claim 9, characterized in that the axial first end of the base (1) is provided with a second housing groove (1 b), the torsion spring (3) being located inside the second housing groove (1 b).