Bidirectional tensioner capable of avoiding collision

Abstract

The utility model discloses a two-way tensioner avoiding collision, which comprises a base, a pivot, a support spring, tensioning arms and a buffer component, the base is of a U-shaped structure, the two tensioning arms are symmetrically mounted on two sides of the base, the tensioning arms are rotatably connected with the base through the pivot, the upper ends of the two tensioning arms are connected through the support spring, and the lower ends of the two tensioning arms are connected through the buffer component. The free ends of the two tensioning arms extend outwards along the two arms of the base, and opening and closing of the two tensioning arms drive the supporting spring to stretch out and draw back. Two limiting baffles are arranged on the outer side edges of the two arms of the base in a protruding mode, the limiting baffles and the base are integrally formed, the two limiting baffles are opposite to the outer sides of the two tensioning arms respectively, a set of buffering assembly is arranged between each tensioning arm and the corresponding limiting baffle, and elastic supporting is formed between the outer sides of the tensioning arms and the limiting baffles through the buffering assemblies. The outer side surface of the tensioning arm cannot directly touch the limiting baffle plate; according to the structure, the tensioning arm can be prevented from directly colliding with the support, noise and structural damage in operation are avoided, and the stability of a belt transmission system is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of automobile bidirectional tensioner, specifically relates to a bidirectional tensioner that avoids collision. BACKGROUND

[0002] In the automobile hybrid power system (hybrid system), the bidirectional tensioner of the generator is a specific device for the automobile generator. This bidirectional tensioner design allows automatic adjustment of the tightness of the belt in two directions. When the engine is working, the tension of the belt will also change due to the change of engine load and speed. The bidirectional tensioner automatically adjusts the tensioning force according to the state of the belts on both sides of the generator through an elastic device and two tensioning arms, which can avoid belt slackness or over-tightness, thereby prolonging the life of the belt and ensuring the stable operation of the power system. The existing bidirectional tensioner mainly includes two movable tensioning arms, a base, a linear spring, and two pulleys. The base is fixed on the automobile, the two movable tensioning arms are hinged to the base through a pivot structure, the tensioning arm is hinged to the pulley at one end, and the linear spring is connected to the other end of the two tensioning arms. When the drive belt changes its own tightness or produces vibration due to changes in engine operating conditions, the working torque exerted by the drive belt on the tensioner (i.e. the torque of the pulley relative to the pivot structure) changes significantly, and the linear spring will automatically compress or elongate, causing the tensioning arm to rotate around the pivot structure, automatically adjusting the belt tension on both ends of the generator pulley.

[0003] The existing structure can also refer to patent CN217874021U. In this structure, a stop block 23 is provided on each of the two tensioning arms 2, which is generally made of engineering plastic with low rigidity. When the tensioning arm 2 is opened outward to a specified angle, the stop block 23 contacts the bracket 1, and under the interaction of the stop block 23 and the bracket 1, the movement of the tensioning arm 2 is limited, thereby limiting the range of movement of the tensioning arm 2.

[0004] However, during the operation of the drive belt, due to engine torsional vibration and changes in accessory load, etc., both tensioning arms are in a state of constant oscillation, and the stop block may frequently collide with the bracket under the drive of the tensioning arm. The impact will cause noise and cause the bracket and the tensioning arm to vibrate, thereby reducing the stability of the belt drive system. In high drive belt tension conditions, the pulley hub force is larger, and the impact is also easy to cause structural damage to the stop block. UTILITY MODEL CONTENTS

[0005] The utility model discloses a two -way tensioner of avoiding collision designs the buffer component between support and tensioning arm, when tensioning arm is close to support, buffer component can establish elastic connection between tensioning arm and support, provides additional damping force for the rotation movement of tensioning arm, reduces the rotation speed of tensioning arm, avoids the direct collision of tensioning arm to support, and then weakens noise, tremor and structural damage etc.

[0006] The utility model discloses a technical scheme as follows: a two -way tensioner of avoiding collision, including base, pivot, support spring, tensioning arm and buffer subassembly, the base is U type structure, two tensioning arms are installed to the both sides of base symmetry, and tensioning arm is rotatedly connected with base through pivot, and the upper end of two tensioning arms is connected through support spring, and the free end of two tensioning arms extends outward along the two arms of base, and the opening and closing of two tensioning arms drive support spring to stretch out and draw back motion;The outside of the both arms of base is provided with two limit baffle and is projected, and limit baffle and base are integrally formed, and limit baffle is perpendicular to the surface of base, and two limit baffles are opposite to the outside of two tensioning arms respectively, and one group buffer subassembly is arranged between each tensioning arm and limit baffle, and buffer subassembly makes the outside of tensioning arm and limit baffle form elastic support, and the outside of tensioning arm cannot directly touch limit baffle. Set up buffer subassembly between tensioning arm and limit baffle, when tensioning arm rotates outward and is close to limit baffle, buffer subassembly can establish elastic connection between the both, provides additional damping force for the rotation movement of tensioning arm, reduces the rotation speed of tensioning arm, avoids the direct collision of tensioning arm to base, and then weakens noise, tremor, avoids structural damage.

[0007] Further, the buffer subassembly is arranged at a position close to the free end of the tensioning arm, the buffer subassembly comprises an outer blind hole, an inner blind hole, a damping block and a buffer spring, the inner blind hole is formed on the outer side surface of the tensioning arm, the outer blind hole corresponding to the inner blind hole is formed on the inner side surface of the limit baffle, the buffer spring is nested in the outer blind hole, the damping block is arranged in the inner blind hole, the outer end of the damping block protrudes from the inner blind hole, the outer end of the damping block can extend into the outer blind hole and abut against the buffer spring, and the tensioning arm rotates outward, so that the damping block presses the buffer spring tightly, and the damping force gradually increases.

[0008] Further, the radial cross section of the damping block is in the shape of a "convex" character, the damping block comprises a fixed cylinder and an abutting cylinder arranged coaxially, the fixed cylinder is connected with the inner blind hole in an interference fit or by thermal fusion bonding, the outer end surface of the fixed cylinder protrudes from the inner blind hole, and the abutting cylinder is connected to the core of the outer end surface of the fixed cylinder.

[0009] Further, a circular groove is formed on the inner wall of the outer blind hole, the circular groove is close to the port of the outer blind hole, a check ring is arranged in the circular groove, the buffer spring is arranged on the inner side of the check ring, and the check ring can limit the end surface of the buffer spring.

[0010] Further, the blocking ring is an open ring-shaped blocking ring, and the abutting cylinder of the damping block is connected to the buffer spring in abutment through the blocking ring.

[0011] Further, the buffer spring is a cylindrical spiral spring, the cross section of the buffer spring is rectangular, the end surface of the buffer spring is pressed by the abutting cylinder, and the buffer spring is always in a compressed state.

[0012] Further, the damping block is made of engineering plastic.

[0013] Further, the free end of the tensioning arm is rotationally connected with a pulley.

[0014] The utility model discloses beneficial effects: in order to solve the problem of the noise damage caused by the outward rotation speed of the tensioning arm of the bidirectional tensioner too fast in the use process, the protruding limiting baffle is arranged on the base, the buffer assembly is arranged between the limiting baffle and the tensioning arm, when the tensioning arm is close to the limiting baffle, the spring in the buffer assembly is compressed, the damping force is increased, the damping force can act on the outside of the tensioning arm, the speed of the outward rotation of the tensioning arm is reduced, the direct impact of the tensioning arm on the limiting baffle and the base is avoided, under the joint action of the inside tensioning force and the outside damping force, the tensioning arm is always in a dynamic swing state, the tensioning arm does not directly impact the base, therefore, the noise and the tremor generated during operation can be weakened, the impact damage to the tensioning arm and the base is avoided, and the stability of the belt transmission system can be improved. ACCURACY OF DRAWINGS

[0015] Figure 1 It is a front view of the bidirectional tensioner of the utility model for avoiding impact;

[0016] Figure 2 It is a side view of the bidirectional tensioner of the utility model for avoiding impact;

[0017] Figure 3 It is Figure 2 It is a sectional view of A-A;

[0018] Figure 4 It is a perspective view of the bidirectional tensioner of the utility model for avoiding impact;

[0019] Figure 5 It is a perspective view of the base;

[0020] Figure 6 It is a perspective view of the tensioning arm;

[0021] Figure 7 It is a structural view of the damping block;

[0022] Figure 8 It is a structural view of the buffer spring;

[0023] Figure 9 It is a structural view of the blocking ring;

[0024] The figure is marked as: base 1, limit baffle 2, outer blind hole 21, round groove 211, pivot 3, supporting spring 4, tensioning arm 5, inner blind hole 51, buffer assembly 6, damping block 61, fixed cylinder 611, abutting cylinder 612, buffer spring 62, check ring 63, pulley 7. DETAILED DESCRIPTION

[0025] The utility model will be further described below in combination with the drawings and examples.

[0026] As Figures 1-9 The utility model discloses a two -way tensioner of avoiding collision, including base 1, pivot 3, supporting spring 4, tensioning arm 5 and buffer assembly 6, base 1 is U type structure, two tensioning arms 5 are symmetrically installed on the both sides of base 1, and tensioning arm 5 is rotatably connected with base 1 through pivot 3, and the upper end of two tensioning arms 5 is connected through supporting spring 4, and the free end of two tensioning arms 5 extends outward along the two arms of base 1, and the opening and closing of two tensioning arms 5 drive supporting spring 4 to stretch and retract movement, the outer side of the two arms of base 1 is provided with two limit baffle 2, and limit baffle 2 is integrally formed with base 1, and limit baffle 2 is perpendicular to the surface of base 1, and two limit baffle 2 are respectively opposite to the outer side of two tensioning arms 5, and a set of buffer assembly 6 is arranged between each tensioning arm 5 and limit baffle 2, buffer assembly 6 forms elastic support between the outer side of tensioning arm 5 and limit baffle 2, and the outer side of tensioning arm 5 cannot directly touch limit baffle 2.

[0027] Buffer assembly 6 is arranged at the position close to the free end of tensioning arm, and buffer assembly 6 includes outer blind hole 21, inner blind hole 51, damping block 61 and buffer spring 62, and inner blind hole 51 is formed on the outer side of tensioning arm 5, outer blind hole 21 is formed on the inner side of limit baffle 2 and corresponds to inner blind hole, buffer spring 62 is nested in outer blind hole 21, damping block 61 is installed in inner blind hole 51, the outer end of damping block 61 protrudes from the port of inner blind hole 51, the outer end of damping block 61 can extend into outer blind hole 21 and abut with buffer spring 62, tensioning arm 5 rotates outward, buffer spring 62 is pressed tightly by damping block 61, and damping force gradually increases, and the free end of tensioning arm 5 is rotatably connected with pulley 7.

[0028] Buffer assembly 6 is arranged between tensioning arm 5 and limit baffle 2, when tensioning arm 5 rotates outward and approaches limit baffle 2, buffer assembly 6 can establish elastic connection between the two, provides additional damping force for the rotary motion of tensioning arm 5, reduces the rotation speed of tensioning arm 5, avoids that tensioning arm 5 directly collides with base 1, and further weakens noise, trembles, avoids structural damage.

[0029] The damping block 61 has a convex radial cross-section and comprises a coaxially arranged fixed cylinder 611 and an abutting cylinder 612. The fixed cylinder 611 and the inner blind hole 51 are connected by an interference fit or hot-melt bonding. The outer end surface of the fixed cylinder 611 is exposed at the end of the inner blind hole 51, and the abutting cylinder 612 is connected to the core of the outer end surface of the fixed cylinder 611. The damping block 61 is made of engineering plastic.

[0030] The inner wall of the outer blind hole 21 is provided with a circular groove 211, which is located near the end of the outer blind hole 21. A retaining ring 63 is mounted within the circular groove 211, and a buffer spring 62 is disposed inside the retaining ring 63. The retaining ring 63 can limit the end face of the buffer spring 62. The buffer spring 62 is a cylindrical coil spring with a rectangular cross-section. The end face of the buffer spring 62 is pressed against the abutting cylinder, and the buffer spring 62 is always in a compressed state.

[0031] The retaining ring 63 is an open annular retaining ring, and the abutting cylinder 612 of the damping block 61 passes through the retaining ring 63 and is abutted against the buffer spring 62 .

[0032] The working principle of this utility model:

[0033] like Figure 3 As shown, the posture of the left tensioning arm and damping block represents the operating condition when the tensioning arm is away from the limit stop. At this time, the damping block 61 on the tensioning arm is not in contact with the buffer spring 62. This state is generally when there is no transmission belt installed between the two pulleys. In this state, the inner side of the tensioning arm is not subject to transmission belt tension. The compressed posture of the right tensioning arm 5 and damping block 61 is the normal working state. At this time, the inner side of the tensioning arm 5 is subject to transmission belt tension, and the outer side is subject to the damping force of the buffer assembly 6. The top ends of the two tensioning arms 5 are also subject to the elastic force of the support spring 4, and the tensioning arms 5 are in dynamic equilibrium.

[0034] As the tension on pulley 7 increases, it drives the tension arm 5 to rotate outward, bringing it closer to the stop plate 2. This forces the abutting cylinder 612 of the damping block 61 through the retaining ring 63, contacting and squeezing the buffer spring 62. The compressed buffer spring 62 exerts an elastic supporting reaction force on the end surface, establishing an elastic connection between the tension arm 5 and the stop plate 2. This supporting reaction force acts as a damping force on the rotational motion of the tension arm 5, reducing its rotational speed. As the rotation angle of the tension arm 5 increases, the compression of the buffer spring 62 increases, increasing the damping force and slowing the outward rotation of the tension arm 5. This prevents the tension arm 5 from colliding with the stop plate 2 at high speeds. When the tension arm 5 reaches the specified limit rotation angle, the outer end surface of the fixed cylinder 611 of the damping block slowly contacts the surface of the stop plate 2, limiting the rotational motion of the tension arm 5 and halting it.

[0035] When the tensioning arm 5 moves away from the limiting baffle in the opposite direction, the damping block 61 gradually leaves the buffer spring 62, and under the elastic force of the end face of the buffer spring 62, the tensioning arm 5 can move away from the limiting baffle 2 at a faster speed. Since the limiting baffle and the base are an integral molded part, the limiting baffle is part of the base, and it can be understood that the tensioning arm cannot hit the base.

[0036] The above is only a few preferred embodiments of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes and replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A two-way tensioner to avoid a collision, characterized in that: The application relates to a supporting device, which comprises a base, a pivot, a supporting spring, a tensioning arm and a buffer assembly, wherein the base is in a U-shaped structure, two tensioning arms are symmetrically arranged on the two sides of the base, the two tensioning arms are rotationally connected with the base through the pivot, the upper ends of the two tensioning arms are connected through the supporting spring, the free ends of the two tensioning arms extend outward along the two arms of the base, and the opening and closing of the two tensioning arms drives the supporting spring to perform the extension and contraction movement; the outer sides of the two arms of the base are provided with two limiting baffle plates, the limiting baffle plates are integrally formed with the base, the limiting baffle plates are perpendicular to the surface of the base, the two limiting baffle plates are opposite to the outer sides of the two tensioning arms respectively, and a group of buffer assemblies are arranged between each tensioning arm and the limiting baffle plate, so that the outer side of the tensioning arm and the limiting baffle plate form elastic support, and the outer side of the tensioning arm cannot directly touch the limiting baffle plate.

2. The collision-avoiding bidirectional tensioner of claim 1, wherein: The buffer assembly is arranged at a position close to the free end of the tensioning arm, the buffer assembly comprises an outer blind hole, an inner blind hole, a damping block and a buffer spring, the inner blind hole is arranged on the outer side of the tensioning arm, the outer blind hole corresponding to the inner blind hole is arranged on the inner side of the limiting baffle plate, the buffer spring is nested in the outer blind hole, the damping block is arranged in the inner blind hole, the outer end of the damping block protrudes from the port of the inner blind hole, the outer end of the damping block can extend into the outer blind hole and abut against the buffer spring, the tensioning arm is rotated outward, so that the damping block presses the buffer spring, and the damping force gradually increases.

3. The collision-avoiding bidirectional tensioner of claim 2, wherein: The radial section of the damping block is in a "convex" shape, the damping block comprises a fixed cylinder and an abutting cylinder which are coaxially arranged, the fixed cylinder is connected with the inner blind hole in an interference fit or is adhesively connected with the inner blind hole through heat melting, the outer end surface of the fixed cylinder is exposed from the port of the inner blind hole, and the abutting cylinder is connected to the core of the outer end surface of the fixed cylinder.

4. The collision-avoiding bidirectional tensioner of claim 3, wherein: A circular groove is arranged on the inner wall of the outer blind hole, the circular groove is close to the port of the outer blind hole, a check ring is arranged in the circular groove, the buffer spring is arranged on the inner side of the check ring, and the check ring can limit the end surface of the buffer spring.

5. The collision-avoiding bidirectional tensioner of claim 4, wherein: The check ring is an open ring-shaped check ring, the abutting cylinder of the damping block passes through the check ring and abuts against the buffer spring.

6. The collision-avoiding bidirectional tensioner of claim 5, wherein: The buffer spring is a cylindrical spiral spring, the section of the buffer spring is rectangular, the end surface of the buffer spring is pressed by the abutting cylinder, and the buffer spring is always in a compressed state.

7. The collision-avoiding bidirectional tensioner of claim 6, wherein: The damping block is made of engineering plastic.

8. The collision-avoiding bidirectional tensioner of claim 7, wherein: The free end of the tensioning arm is rotationally connected with a belt wheel.

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