Chain tensioning device for motorcycle

Abstract

The utility model discloses a chain tensioning device for a motorcycle, which relates to the field of chain tensioning and comprises rear forks symmetrically arranged on two sides of a rear wheel mechanism of the motorcycle, a sliding groove is arranged on the outer side of the left end of each rear fork, a mounting block device is connected in each sliding groove, and the mounting block devices are used for mounting the rear wheel mechanism of the motorcycle. A locking hole with an opening facing leftwards is formed in the right side of the sliding groove, a guide hole with an opening facing the inner side of the rear fork is formed in the locking hole, an adjusting bolt is installed in the locking hole, a spring ball device is installed in the guide hole, and the spring ball device is perpendicular to the adjusting bolt and abuts against the adjusting bolt. The rotating angle of the adjusting bolt is calculated according to the sound frequency by matching with scale marks on the rear fork and a pointer of the mounting block device, mutual reference is achieved, the chain tensioning adjusting precision is improved, the adjusting bolt is limited and fixed, abnormal sound generated by jumping of a steel ball is avoided, the adjusting bolt is prevented from rebounding repeatedly, and the reliability of the device is greatly improved.

Description

Technical Field

[0001] This utility model belongs to the field of chain tensioning, specifically relating to a chain tensioning device for motorcycles. Background Technology

[0002] Chain drive is the most common power transmission method in motorcycle transmission systems. Because the chain length is not adjustable, prolonged use can cause the chain pitch to increase, leading to greater chain slack and reduced effective engagement between the chain and sprockets, thus decreasing transmission efficiency. Therefore, a tensioning device is needed to allow users to easily adjust the chain tension. Existing common manual tensioning devices use tensioning bolts to adjust the rear axle position and regulate chain tension, offering advantages such as low cost and simple structure.

[0003] Patent application CN202211020459.9 discloses a chain tensioner device, including a bolt for adjusting chain tension. Rotating the bolt causes the wheel axle to move, thus adjusting the chain tension. The bolt has circumferentially distributed slots. A telescopic ball, a spring, and a plunger are also included. The telescopic ball and plunger are connected to the two ends of the spring. The spring pushes the telescopic ball outwards towards the plunger, causing the telescopic ball to abut against the slots. When adjusting the bolt, the slots periodically contact the telescopic ball, producing a sound. The rotation angle of the stud is calculated based on the sound to assist in chain tensioning and improve adjustment accuracy. However, in this structure, the spring is vertically positioned, and the telescopic ball lacks a limiting position, which can easily produce abnormal noise. After tensioning, the bolt lacks a locking mechanism, leading to repeated rebound and affecting the reliability of the device. Relying solely on sound to determine chain tension makes it susceptible to external interference, affecting adjustment accuracy. Utility Model Content

[0004] To address the problems mentioned in the background section, this utility model provides a chain tensioning device for motorcycles, which improves adjustment accuracy, avoids abnormal noise, and enhances device reliability.

[0005] To achieve the above objectives, the specific technical solution of this utility model is as follows:

[0006] A chain tensioning device for motorcycles includes rear forks symmetrically arranged on both sides of the rear wheel mechanism. A groove is formed on the outer side of the left end of each rear fork, and a mounting block is connected to the groove for mounting the rear wheel mechanism. A locking hole with its opening facing left is formed on the right side of the groove, and a guide hole with its opening facing the inner side of the rear fork is formed on the locking hole. An adjusting bolt is installed in the locking hole, and a spring ball device is installed in the guide hole. The spring ball device is perpendicular to and abuts against the adjusting bolt.

[0007] As a further feature of the above scheme, a waist-shaped mounting hole is provided at the center of the slide groove, allowing the motorcycle rear wheel mechanism to move horizontally within the waist-shaped mounting hole. A scale mark is provided above the slide groove, and a first thread is provided on the left end of the inner wall of the locking hole, while a second thread is provided on the inner end of the inner wall of the guide hole.

[0008] As a further feature of the above solution, the mounting block device includes a mounting block with a shaft hole and a vertically upward pointer. The mounting block is slidably installed in a groove, the shaft hole is used to install the motorcycle rear wheel mechanism, and the right end of the mounting block abuts against an adjusting bolt.

[0009] As a further feature of the above scheme, the left end of the adjusting bolt is provided with a hexagonal head, and the right side of the hexagonal head of the bolt is provided with a locking thread. A preload nut is connected to the locking thread, and the locking thread is engaged with the first thread. An axially distributed circumferential groove is provided on the outer wall of the adjusting bolt on the right side of the locking thread.

[0010] As a further provision of the above scheme, the spring ball device includes an external threaded plug, which is connected to a second thread. The external threaded plug is provided with a connecting rod that runs downward along the central axis. A positioning ball is fixedly connected to the lower end of the connecting rod. A spherical groove is opened at the lower end of the positioning ball. A telescopic spring is sleeved on the connecting rod. The length of the telescopic spring is longer than that of the connecting rod. A steel ball is fixedly connected to the lower end of the telescopic spring.

[0011] This utility model has the following beneficial effects:

[0012] Tighten the adjusting bolt. The adjusting bolt pushes the mounting block device backward, thereby pushing the motorcycle's rear wheel mechanism backward and tensioning the chain. When the adjusting bolt rotates, the steel ball contacts the long groove in sequence under the action of the telescopic spring, making a sound as a reminder. The rotation angle of the adjusting bolt can be calculated based on the number of sounds. By referring to the pointer and scale markings, the adjustment accuracy of the chain tension can be improved.

[0013] After the chain is adjusted, screw the external threaded plug inward. The connecting rod drives the positioning ball to move horizontally. The spherical groove contacts the steel ball, and the positioning ball abuts against the steel ball and applies pressure to the steel ball. In conjunction with the long groove, the adjusting bolt is limited and fixed. At the same time, tighten the preload nut and it contacts the rear fork to further limit and fix the adjusting bolt, preventing the steel ball from jumping and causing abnormal noise, and preventing the adjusting bolt from repeatedly rebounding, which greatly improves the reliability of the device. Attached Figure Description

[0014] Figure 1 This is a front view of the appearance of this utility model;

[0015] Figure 2 This is a schematic diagram of a partial cross-section along the AA direction of this utility model;

[0016] Figure 3 This is a schematic diagram of the cross-section of the rear fork of this utility model;

[0017] Figure 4 This is a schematic diagram showing the positions of the mounting block device and the spring ball device of this utility model;

[0018] Figure 5 This is a schematic diagram of the spring ball device of this utility model.

[0019] 1. Rear fork; 2. Mounting block device; 3. Adjusting bolt; 4. Preload nut; 5. Spring ball device; 101. Slide groove; 102. Waist-shaped mounting hole; 103. Scale mark; 104. Locking hole; 1041. First thread; 105. Guide hole; 1051. Second thread; 201. Mounting block; 202. Shaft hole; 203. Pointer; 301. Bolt hexagonal head; 302. Locking thread; 303. Long groove; 501. External thread plug; 502. Connecting rod; 503. Positioning ball; 5031. Spherical groove; 504. Telescopic spring; 505. Steel ball. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The following will refer to the appendix... Figures 1-5 This application will be described in detail with reference to the embodiments.

[0022] like Figure 1 , Figure 2 As shown, a chain tensioning device for a motorcycle includes a rear fork 1 symmetrically arranged on both sides of the rear wheel mechanism of the motorcycle. A groove 101 is opened on the outer side of the left end of the rear fork 1. A mounting block device 2 is connected in the groove 101. The mounting block device 2 is used to install the rear wheel mechanism of the motorcycle. A locking hole 104 with its opening facing left is opened on the right side of the groove 101. A guide hole 105 with its opening facing the inner side of the rear fork 1 is opened on the locking hole 104. An adjusting bolt 3 is installed in the locking hole 104. A spring ball device 5 is installed in the guide hole 105. The spring ball device 5 is perpendicular to and abuts against the adjusting bolt 3.

[0023] like Figure 3As shown, a waist-shaped mounting hole 102 is opened at the center of the slide groove 101. The motorcycle rear wheel mechanism can move horizontally within the waist-shaped mounting hole 102. When the motorcycle rear wheel mechanism can move horizontally within the waist-shaped mounting hole 102, the tension of the chain will change. A scale line 103 is provided above the slide groove 101. A first thread 1041 is opened at the left end of the inner wall of the locking hole 104, and a second thread 1051 is opened at the inner end of the inner wall of the guide hole 105.

[0024] like Figure 4 As shown, the mounting block device 2 includes a mounting block 201 with a shaft hole 202 and a vertically upward pointer 203. The mounting block 201 is slidably installed in the slide groove 101. The shaft hole 202 is used to install the motorcycle rear wheel mechanism. The right end of the mounting block 201 abuts against the adjusting bolt 3. The left end of the adjusting bolt 3 is provided with a bolt hexagonal head 301. The right side of the bolt hexagonal head 301 is provided with a locking thread 302. A preload nut 4 is connected to the locking thread 302. The locking thread 302 is engaged with the first thread 1041. The outer wall of the adjusting bolt on the right side of the locking thread 302 is provided with an axially distributed circumferentially distributed long groove 303.

[0025] like Figure 5 As shown, the spring ball device 5 includes an external threaded plug 501, which is connected to the second thread 1051. The external threaded plug 501 is provided with a connecting rod 502 that runs downward along the central axis. A positioning ball 503 is fixedly connected to the lower end of the connecting rod 502. A spherical groove 5031 is opened at the lower end of the positioning ball 503. A telescopic spring 504 is sleeved on the connecting rod 502. The length of the telescopic spring 504 is longer than that of the connecting rod 502. A steel ball 505 is fixedly connected to the lower end of the telescopic spring 504.

[0026] The working process of this utility model is as follows: During adjustment, firstly, use a tool to tighten the adjusting bolt 3 through the hexagonal head 301. The adjusting bolt 3 pushes the mounting block device 2 backward, thereby pushing the motorcycle rear wheel mechanism backward and tensioning the chain. When the adjusting bolt 3 rotates, under the action of the telescopic spring 504, the steel ball 505 contacts the long groove 303 in sequence, emitting a sound as a reminder. The rotation angle of the adjusting bolt 3 can be calculated based on the number of sounds. By referring to the pointer 203 and the scale mark 103, the chain tension can be increased. The chain tension adjustment accuracy is as follows: After the chain adjustment is completed, the external thread plug 501 is screwed inward, and the positioning ball 503 is moved horizontally through the connecting rod 502. The spherical groove 5031 contacts the steel ball 505, and the positioning ball 503 abuts against the steel ball 505 and applies pressure to the steel ball 505. In conjunction with the long groove 303, the adjusting bolt 3 is limited and fixed. At the same time, the preload nut 4 is tightened and contacts the rear fork 1 to further limit and fix the adjusting bolt 3, so as to avoid the steel ball 505 jumping and producing abnormal noise, and to prevent the adjusting bolt 3 from repeatedly rebounding.

[0027] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model.

[0028] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A chain tensioning device for motorcycles, comprising rear forks symmetrically arranged on both sides of the motorcycle's rear wheel mechanism, characterized in that, A groove is provided on the outer side of the left end of the rear fork. A mounting block device is connected in the groove. The mounting block device is used to install the rear wheel mechanism of the motorcycle. A locking hole with its opening facing left is provided on the right side of the groove. A guide hole with its opening facing the inside of the rear fork is provided on the locking hole. An adjusting bolt is installed in the locking hole. A spring ball device is installed in the guide hole. The spring ball device is perpendicular to and abuts against the adjusting bolt.

2. The chain tensioning device for motorcycles according to claim 1, characterized in that, A waist-shaped mounting hole is provided at the center of the slide groove, and a scale mark is provided above the slide groove. A first thread is provided at the left end of the inner wall of the locking hole, and a second thread is provided at the inner end of the inner wall of the guide hole.

3. The chain tensioning device for motorcycles according to claim 2, characterized in that, The mounting block device includes a mounting block with a shaft hole and a vertically upward pointer. The mounting block is slidably installed in a groove, and the right end of the mounting block abuts against an adjusting bolt.

4. The chain tensioning device for motorcycles according to claim 2, characterized in that, The left end of the adjusting bolt is provided with a hexagonal head, and the right side of the hexagonal head is provided with a locking thread. A preload nut is connected to the locking thread, and the locking thread is engaged with the first thread. The outer wall of the adjusting bolt on the right side of the locking thread is provided with an axially distributed circumferential groove.

5. The chain tensioning device for motorcycles according to claim 2, characterized in that, The spring ball device includes an external threaded plug, which is connected to a second thread. The external threaded plug is provided with a connecting rod that runs downward along the central axis. A positioning ball is fixedly connected to the lower end of the connecting rod. A spherical groove is opened at the lower end of the positioning ball. A telescopic spring is sleeved on the connecting rod. The length of the telescopic spring is longer than that of the connecting rod. A steel ball is fixedly connected to the lower end of the telescopic spring.

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