Synchronous belt active tensioning device and rear wheel steering gear

Abstract

The utility model relates to the technical field of synchronous belt tensioning devices, and provides a synchronous belt driving tensioning device and a rear wheel steering gear, which comprise a driving wheel, a driven wheel and a torsion rod spring, the driving wheel is connected with a motor and is in transmission connection with the driven wheel through a synchronous belt, one end of the torsion rod spring is relatively fixed, and the other end of the torsion rod spring is fixed. The other end of the torsion rod spring is connected with an eccentric wheel, the eccentric wheel is connected with a tensioning wheel used for abutting against the synchronous belt, the tensioning wheel and the torsion rod spring are eccentrically arranged, and pre-tightening force of the torsion rod spring acts on the eccentric wheel to enable the eccentric wheel to rotate; the tensioning wheel moves to offset the loose gap between the tensioning wheel and the synchronous belt, the synchronous belt is further abutted, automatic dynamic adjustment of the tensioning force of the synchronous belt is achieved, the risk of synchronous belt transmission slipping is reduced, and the stability and reliability of a transmission system are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of synchronous belt tensioning devices, in particular to an active synchronous belt tensioning device and a rear wheel steering gear. Background Art

[0002] At present, the rear-wheel active steering gear is usually driven by a steering motor. The motor is independently designed outside the steering gear housing. Through a secondary reduction mechanism, the rotational motion of the motor is converted into axial displacement of the screw, which is used to promote the lateral movement of the wheel suspension steering rod, thereby driving the rear wheel steering.

[0003] The common rear wheel steering gear secondary reduction mechanism mainly adopts synchronous belt and synchronous pulley transmission mechanism. However, the aging problem of synchronous belt leads to a decrease in tension and needs to be adjusted regularly. At present, the tension of synchronous belt is usually adjusted by adjusting the center distance of two synchronous pulleys, but because the structure of the steering gear is fixed, the installation position of the synchronous pulley axis cannot be moved at will; in addition, a synchronous pulley tensioning mechanism can be added, but it also needs regular manual operation, which is very inconvenient and the adjustment range is difficult to accurately grasp. Utility Model Content

[0004] The purpose of the utility model is to provide an active synchronous belt tensioning device and a rear wheel steering gear to solve the above-mentioned technical problems, realize automatic dynamic adjustment of the synchronous belt tensioning force, reduce the risk of synchronous belt transmission slippage, and ensure the stability and reliability of the transmission system.

[0005] The embodiment of the utility model is realized through the following technical scheme: a synchronous belt active tensioning device, including a driving wheel and a driven wheel, the driving wheel is connected to a motor, the driving wheel is connected to the driven wheel through a synchronous belt, and also includes a torsion bar spring, one end of the torsion bar spring is relatively fixed, the other end of the torsion bar spring is connected to an eccentric wheel, the eccentric wheel is connected to a tensioning wheel for tightening the synchronous belt, and the tensioning wheel and the torsion bar spring are eccentrically arranged.

[0006] Furthermore, it also includes a limiting mechanism for limiting the unidirectional rotation of the eccentric wheel.

[0007] Preferably, the limiting mechanism comprises tooth grooves and ratchet pawls, the tooth grooves are evenly arranged on the outer periphery of the eccentric wheel, and the ratchet pawls cooperate with the tooth grooves for unidirectional intermittent motion.

[0008] Furthermore, the tensioning wheel is rotatably connected to the eccentric wheel via a rotating shaft.

[0009] Furthermore, the tension wheel and the torsion bar spring are respectively connected to two sides or the same side of the eccentric wheel.

[0010] A rear wheel steering gear comprises the above-mentioned active synchronous belt tensioning device.

[0011] The utility model has at least the following advantages and beneficial effects: the preload force of the torsion bar spring acts on the eccentric wheel, causing the eccentric wheel to rotate; and simultaneously, due to the eccentric arrangement of the tensioning wheel and the torsion bar spring, the movement of the tensioning wheel offsets the slack gap between the tensioning wheel and the synchronous belt, further tightening the synchronous belt, thereby achieving automatic dynamic adjustment of the tensioning force of the synchronous belt, reducing the risk of slippage of the synchronous belt drive, and ensuring the stability and reliability of the transmission system. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 A front view of a rear wheel steering device provided by the utility model;

[0014] Figure 2 For this utility model Figure 1 Sectional view along AA direction;

[0015] Figure 3 A schematic diagram of the structure of a synchronous belt active tensioning device provided by the utility model;

[0016] Figure 4 An enlarged view of an active tensioning device for a synchronous belt provided by the utility model;

[0017] Icon: 1-housing, 2-driving wheel, 3-driven wheel, 4-motor, 5-synchronous belt, 6-torsion bar spring, 7-eccentric wheel, 70-rotating shaft, 8-tensioning wheel, 9-limiting mechanism, 90-shaft rod, 91-tooth groove, 92-ratchet. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Example

[0021] like Figure 1-4 As shown, in this embodiment, a synchronous belt active tensioning device is mainly disclosed, which has a simple and reliable structure and saves layout space, including a driving wheel 2 and a driven wheel 3, the driving wheel 2 is connected to a motor 4 for driving the driving wheel 2 to rotate, and the driving wheel 2 is connected to the driven wheel 3 through a synchronous belt 5. The device also includes a torsion bar spring 6, one end of the torsion bar spring 6 is relatively fixed, and the other end of the torsion bar spring 6 is connected to an eccentric wheel 7, and the eccentric wheel 7 is connected to a tensioning wheel 8 for tightening the synchronous belt 5, and the tensioning wheel 8 and the torsion bar spring 6 are eccentrically arranged; it should be noted that the torsion bar spring 6 is made of spring steel The torsion bar can be set with a certain preload force during installation; after long-term use, the tension of the synchronous belt 5 decreases and it becomes loose and longer. The device acts on the eccentric wheel 7 through the preload force of the torsion bar spring 6, so that the eccentric wheel 7 rotates. At the same time, due to the eccentric arrangement of the tensioning wheel 8 and the torsion bar spring 6, the tensioning wheel 8 moves to offset the slack gap between the tensioning wheel 8 and the synchronous belt 5, further tightening the synchronous belt 5, and realizing automatic dynamic adjustment of the tensioning force of the synchronous belt 5, so that the synchronous belt 5 always maintains an appropriate tension, reduces the risk of transmission slippage of the synchronous belt 5, and ensures the stability and reliability of the transmission system.

[0022] Furthermore, in the specific implementation, the above-mentioned embodiment provided in the utility model also includes a limiting mechanism 9 for limiting the unidirectional rotation of the eccentric wheel 7; specifically, the limiting mechanism 9 includes a tooth groove 91 and a ratchet 92, the tooth groove 91 is evenly arranged on the outer periphery of the eccentric wheel 7, and the ratchet 92 cooperates with the tooth groove 91 for unidirectional intermittent movement; it should be noted that the ratchet 92 can be arranged above the eccentric wheel 7, and after the tension of the synchronous belt 5 decreases, the abutment effect of the synchronous belt 5 on the tension wheel 8 becomes smaller. At this time, under the preload force of the torsion bar spring 6 The lower eccentric wheel 7 is rotated, and the back of the tooth abuts and moves the pawl 92 upward. When the pawl 92 slides over the tooth groove 91, the pawl 92 falls down under the action of gravity and is reinserted into the tooth groove 91, thereby realizing the intermittent motion coordination of the pawl 92 and the tooth groove 91. In addition, the pawl 92 can be reset and swung by adding elastic parts such as torsion springs. When the tensioning wheel 8 is pressed against the synchronous belt 5 again, the eccentric wheel 7 stops rotating. The pawl 92 cooperates with the tooth groove 91 to realize the unidirectional rotation of the eccentric wheel 7, thereby effectively preventing the eccentric wheel 7 from reversing.

[0023] Furthermore, in a specific implementation, the tensioning wheel 8 provided in the embodiment of the utility model is rotatably connected to the eccentric wheel 7 via a rotating shaft 70. Preferably, the tensioning wheel 8 can be a bearing structure, which is installed on the eccentric wheel 7 by an interference fit, so that the tensioning wheel 8 rotates following the movement of the synchronous belt 5, thereby reducing the wear on the synchronous belt 5, extending the service life of the synchronous belt 5, and reducing the maintenance cost.

[0024] Furthermore, in a specific implementation, the tension wheel 8 and the torsion bar spring 6 provided in the embodiment of the utility model are respectively connected to both sides or the same side of the eccentric wheel 7, such as Figure 3 , 4 As shown, the embodiment of the utility model is a schematic diagram of a situation in which the tensioning wheel 8 and the torsion bar spring 6 are respectively connected to the two sides of the eccentric wheel 7.

[0025] In this embodiment, a rear wheel steering gear based on the above-mentioned active tensioning device of the synchronous belt is also disclosed, specifically, it includes a shell 1, a driven wheel 3 is rotatably connected to the shell 1 through a bearing, one end of the torsion bar spring 6 is fixed to the shell 1, and a pawl 92 is swingably connected to the shell 1 through a shaft 90.

[0026] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A synchronous belt active tensioning device, comprising a driving wheel (2) and a driven wheel (3), wherein the driving wheel (2) is connected to a motor (4), and the driving wheel (2) is transmission-connected to the driven wheel (3) via a synchronous belt (5), characterized in that: It also includes a torsion bar spring (6), one end of which is relatively fixed, and the other end of which is connected to an eccentric wheel (7), and the eccentric wheel (7) is connected to a tensioning wheel (8) for tightening the synchronous belt (5), and the tensioning wheel (8) and the torsion bar spring (6) are eccentrically arranged.

2. The active tensioning device for a synchronous belt according to claim 1, characterized in that: It also includes a limiting mechanism (9) for limiting the unidirectional rotation of the eccentric wheel (7).

3. The active tensioning device for a synchronous belt according to claim 2, characterized in that: The limiting mechanism (9) comprises a tooth groove (91) and a ratchet (92); the tooth groove (91) is evenly arranged on the outer periphery of the eccentric wheel (7); and the ratchet (92) cooperates with the tooth groove (91) in unidirectional intermittent motion.

4. The active tensioning device for a synchronous belt according to claim 1, characterized in that: The tension wheel (8) is rotatably connected to the eccentric wheel (7) via a rotating shaft (70).

5. The active tensioning device for a synchronous belt according to claim 1, characterized in that: The tension wheel (8) and the torsion bar spring (6) are respectively connected to two sides or the same side of the eccentric wheel (7).

6. A rear wheel steering gear, characterized in that: It comprises an active synchronous belt tensioning device as described in any one of claims 1 to 5.

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