Chain tensioning device based on ratchet mechanism

Abstract

The utility model discloses a chain tensioning device based on a ratchet mechanism, which comprises a chain wheel, a box body, a tension spring, a gear shaft, a gear shaft bearing seat, a gear and ratchet combination shaft, a gear and ratchet combination shaft bearing seat, a chain wheel shaft, a chain wheel shaft bearing sleeve, a movable chain wheel shaft bearing seat, a pawl spring, a pawl, a shaft end check ring, a sleeve, a chain wheel shaft bearing and a box cover, the device is characterized in that the box cover is fixed on the box body, the gear shaft bearing seat and the gear and ratchet wheel combined shaft bearing seat are fixed on the inner wall of the bottom surface of the box body, the movable chain wheel shaft bearing seat is located in the box body, the box body is connected with the movable chain wheel shaft bearing seat through the tension spring, and the gear shaft is installed on the gear shaft bearing seat. The gear and ratchet wheel combined shaft, the pawl spring and the pawl are installed on the gear and ratchet wheel combined shaft bearing seat, the chain wheel shaft is installed on the movable chain wheel shaft bearing seat, and the chain wheel is installed on the chain wheel shaft. The device is simple in structure, low in cost, easy to mount and dismount and convenient to operate.

Description

Technical Field

[0001] This patent relates to the technical field of chain tensioning device design, specifically a chain tensioning device based on a ratchet mechanism. Background Art

[0002] Chain drives are widely used in many mechanical transmission scenarios. For chain drive systems, maintaining the chain in a properly tensioned state is crucial. Currently, most common chain tensioning devices achieve chain tensioning by adding a tensioning pulley. However, this approach has significant drawbacks. On the one hand, the addition of a tensioning pulley complicates the structure of the entire transmission system, adding additional friction contact surfaces, which in turn reduces transmission efficiency. On the other hand, due to the increased friction contact, the wear of the chain and related transmission components also increases. This not only shortens the service life of each component, but may also cause transmission failures and other problems due to excessive wear during long-term use.

[0003] To overcome the shortcomings of traditional chain tensioning methods and meet the real-world demand for efficient, stable, and automatically tensioned chain drives, a chain tensioning device based on a ratchet mechanism has emerged. This device leverages the characteristics of the ratchet mechanism to achieve automatic chain tensioning without the need for an additional tensioning pulley. Furthermore, the other end of the sprocket shaft is connected to the power input or output device via a universal coupling, ensuring smooth transmission and providing a more advantageous tensioning solution for chain drive systems. Utility Model Content

[0004] In view of the shortcomings of existing similar devices, this patent provides a chain tensioning device based on a ratchet mechanism with simple structure, low cost, strong adaptability and stability.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by this patent is a chain tensioning device based on a ratchet mechanism, including a sprocket, a box body, a tension spring, a gear shaft, a gear shaft bearing seat, a gear ratchet combination shaft, a gear ratchet combination shaft bearing seat, a sprocket shaft, a sprocket shaft bearing sleeve, a movable sprocket shaft bearing seat, a pawl spring, a pawl, a shaft end retaining ring, a sleeve, a sprocket shaft bearing and a box cover, characterized in that: the box cover is fixed to the box body by screws, the gear shaft bearing seat and the gear ratchet combination shaft bearing seat are fixed to the bottom inner wall of the box body by screws, the movable sprocket shaft bearing seat is located inside the box body, the box body and the movable sprocket shaft bearing seat are connected by a tension spring, the gear shaft is installed on the gear shaft bearing seat, the gear ratchet combination shaft, the pawl spring and the pawl are installed on the gear ratchet combination shaft bearing seat, the sprocket shaft is installed on the movable sprocket shaft bearing seat through the sprocket shaft bearing and the sprocket shaft bearing sleeve, and the sprocket is installed on the sprocket shaft through a flat key, a sleeve and a shaft end retaining ring.

[0006] The box body includes a box body spring fixer, a sprocket shaft bearing seat limiting rod and a movable groove, and is characterized in that: the box body spring fixer is welded on the inner side wall of the box body, the sprocket shaft bearing seat limiting rod is welded on the top inner wall of the box body, and the side wall of the box body is provided with a movable groove.

[0007] The movable sprocket shaft bearing seat includes a limiter, a roller, a bearing seat spring fixer and a rack, and is characterized in that a limiter is provided on the upper part of the movable sprocket shaft bearing seat, a rack is provided on the lower part, the roller is installed on the limiter, and the bearing seat spring fixer is welded to the side of the movable sprocket shaft bearing seat.

[0008] The beneficial effects of this patent are: simple structure, low cost, strong adaptability and stability, and easy operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is an overall schematic diagram of this patent.

[0010] Figure 2 It is a longitudinal cross-sectional view of this patent through the central axis of the sprocket shaft.

[0011] Figure 3 It is a schematic diagram of the ratchet mechanism part of this patent.

[0012] Figure 4 It is a schematic diagram of the internal structure of the box of this patent.

[0013] Figure 5 It is a schematic diagram of the movable sprocket shaft bearing seat structure of this patent.

[0014] As shown in the figure: 1-sprocket; 2-housing; 3-tension spring; 4-gear shaft; 5-gear shaft bearing seat; 6-gear ratchet combination shaft; 7-gear ratchet combination shaft bearing seat; 8-sprocket shaft; 9-sprocket shaft bearing sleeve; 10-movable sprocket shaft bearing seat; 11-pawl spring; 12-pawl; 13-shaft end retaining ring; 14-sleeve; 15-sprocket shaft bearing; 16-housing cover; 21-housing spring retainer; 22-sprocket shaft bearing seat limit rod; 23-movable groove; 101-limiter; 102-roller; 103-bearing seat spring retainer; 104-rack. DETAILED DESCRIPTION

[0015] In order to make the above-mentioned purposes, features and advantages of this patent more obvious and easy to understand, the specific implementation methods of this patent are described in detail below with reference to the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of this patent. However, this patent can also be implemented in other ways different from those described herein. Those skilled in the art can make similar generalizations without violating the connotation of this patent. Therefore, this patent is not limited to the specific implementation methods disclosed below.

[0016] Secondly, this patent describes the device in detail with schematic diagrams. For ease of explanation, the schematic diagrams depicting the device structure may be partially enlarged, not to scale, when describing the embodiments of this patent. Furthermore, these schematic diagrams are merely illustrative and should not limit the scope of protection of this patent. Furthermore, in actual production, the three-dimensional dimensions of length, width, and depth should be included. Example

[0017] In order to make the purpose, technical solutions and advantages of this patent clearer, the implementation methods of this patent will be further described in detail below with reference to the accompanying drawings.

[0018] like Figure 1 and Figure 2 A chain tensioning device based on a ratchet mechanism includes a sprocket 1, a box body 2, a tension spring 3, a gear shaft 4, a gear shaft bearing seat 5, a gear-ratchet combination shaft 6, a gear-ratchet combination shaft bearing seat 7, a sprocket shaft 8, a sprocket shaft bearing sleeve 9, a movable sprocket shaft bearing seat 10, a pawl spring 11, a pawl 12, a shaft end retaining ring 13, a sleeve 14, a sprocket shaft bearing 15 and a box cover 16.

[0019] like Figure 4 The box body 2 includes a box body spring fixer 21, a sprocket shaft bearing seat limiting rod 22 and a moving groove 23.

[0020] like Figure 5 The movable sprocket shaft bearing seat 10 includes a limiter 101, a roller 102, a bearing seat spring fixer 103 and a rack 104.

[0021] When the chain becomes loose, the movable sprocket shaft bearing seat 10 is subjected to the tension of the tension spring 3, and the movable sprocket shaft bearing seat 10 moves in the direction of chain tensioning. Due to the mutual constraint between the sprocket shaft bearing seat limit rod 22 and the limiter 101, the mutual constraint between the roller 102 and the inner wall of the top surface of the box body 2, and the mutual cooperation between the rack 104 and the gear shaft 4, and the gear ratchet combination shaft 6, the movable sprocket shaft bearing seat 10 has only the degree of freedom in the direction of the central axis of the tension spring 3.

[0022] like Figure 3When the movable sprocket shaft bearing seat 10 moves in the direction of chain tensioning, the rack 104 moves to the left, and at the same time drives the gear shaft 4 and the gear ratchet combination shaft 6 to rotate counterclockwise. At this time, due to the interaction between the ratchet and the pawl 12 on the gear ratchet combination shaft 6, the gear ratchet combination shaft 6 and the gear shaft 4 are allowed to rotate counterclockwise, and the gear ratchet combination shaft 6 and the gear shaft 4 are prevented from rotating clockwise, that is, the rack 104 is allowed to move to the left and the rack 104 is prevented from moving to the right. At the same time, the module of the ratchet is small, and the number of teeth is large when the diameter is constant, and three pawls 12 are used. When the gear ratchet combination shaft 6 has a tendency to rotate in the opposite direction, it can provide anti-reverse blocking force from multiple angles, making the anti-reverse effect more uniform and improving the stability of preventing reverse rotation.

[0023] Although the present invention has been described above with reference to embodiments, various modifications may be made thereto and components may be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there are no structural conflicts, the various features of the embodiments disclosed in the present invention may be combined with each other in any manner, and the fact that these combinations are not exhaustively described in this specification is solely for the purpose of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A chain tensioning device based on a ratchet mechanism, comprising a sprocket (1), a housing (2), a tension spring (3), a gear shaft (4), a gear shaft bearing seat (5), a gear ratchet combination shaft (6), a gear ratchet combination shaft bearing seat (7), a sprocket shaft (8), a sprocket shaft bearing sleeve (9), a movable sprocket shaft bearing seat (10), a pawl spring (11), a pawl (12), a shaft end retaining ring (13), a sleeve (14), a sprocket shaft bearing (15) and a housing cover (16), characterized in that: The box cover (16) is fixed to the box body (2) by screws, the gear shaft bearing seat (5) and the gear ratchet combination shaft bearing seat (7) are fixed to the bottom inner wall of the box body (2) by screws, the movable sprocket shaft bearing seat (10) is located inside the box body (2), the box body (2) and the movable sprocket shaft bearing seat (10) are connected by a tension spring (3), the gear shaft (4) is installed on the gear shaft bearing seat (5), the gear ratchet combination shaft (6), the pawl spring (11) and the pawl (12) are installed on the gear ratchet combination shaft bearing seat (7), the sprocket shaft (8) is installed on the movable sprocket shaft bearing seat (10) through the sprocket shaft bearing (15) and the sprocket shaft bearing sleeve (9), and the sprocket (1) is installed on the sprocket shaft (8) through a flat key, a sleeve (14) and a shaft end retaining ring (13).

2. A chain tensioning device based on a ratchet mechanism according to claim 1, characterized in that The box body (2) includes a box body spring retainer (21), a sprocket shaft bearing seat limiting rod (22) and a movable groove (23), and is characterized in that: the box body spring retainer (21) is welded to the inner side wall of the box body (2), the sprocket shaft bearing seat limiting rod (22) is welded to the inner wall of the top surface of the box body (2), and the side wall of the box body (2) is provided with a movable groove (23).

3. A chain tensioning device based on a ratchet mechanism according to claim 1, characterized in that The movable sprocket shaft bearing seat (10) comprises a stopper (101), a roller (102), a bearing seat spring retainer (103) and a rack (104), and is characterized in that the upper portion of the movable sprocket shaft bearing seat (10) is provided with a stopper (101), the lower portion is provided with a rack (104), the roller (102) is mounted on the stopper (101), and the bearing seat spring retainer (103) is welded to the side of the movable sprocket shaft bearing seat (10).

Images