Single-cylinder engine transmission system

Abstract

The utility model relates to a single-cylinder engine transmission system, which belongs to the technical field of mechanical transmission and comprises a gearbox body, a belt pulley clutch is arranged on an input shaft of the gearbox body, and the belt pulley clutch is connected with an output shaft of an engine through a triangular belt. A clutch separation mechanism capable of controlling the belt pulley clutch to realize separation or combination is arranged between the belt pulley clutch and the gearbox body; a bearing seat communicated with the interior of the gearbox body is arranged on an input shaft of the gearbox body, two tapered roller bearings are arranged at the two axial ends of the inner side of the bearing seat, and the two tapered roller bearings are installed on the input shaft of the gearbox body. The tapered roller bearing supports the input shaft entering the gearbox body, and the problem that the position of the input shaft bears torque and bending moment is solved. The input shaft of the gearbox body is linked with the engine through the belt pulley clutch, so that the gear shifting smoothness is improved, and the gear shifting resistance is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical transmission, and particularly relates to a transmission system of a single-cylinder engine. Background Art

[0002] The clutch is located in the flywheel housing between the engine and the gearbox. The clutch assembly is fixed on the rear plane of the flywheel with screws. The output shaft of the clutch is the input shaft of the gearbox. During the driving of an automobile, the driver can step on or release the clutch pedal as needed to temporarily separate and gradually engage the engine and the gearbox, so as to cut off or transmit the power input from the engine to the transmission. The clutch is a commonly used component in mechanical transmission and can separate or engage the transmission system at any time. Its basic requirements are: smooth engagement, quick and complete separation; convenient adjustment and repair; small overall dimensions; small mass; good wear resistance and sufficient heat dissipation capacity; convenient and labor-saving operation. Commonly used clutches are divided into two categories: jaw clutches and friction clutches.

[0003] At present, in vehicles powered by single-cylinder engines, pulley clutches are generally used, and most of the matched gearboxes adopt sliding gear shifting structures. When shifting gears at different speeds in vehicles with this structure, a pair of gears with unequal linear speeds need to be engaged, resulting in impact during gear shifting, causing noise and even damage. In addition, when the driver operates, a large shifting force is required to complete gear shifting in a short time, which is likely to cause driver fatigue.

[0004] In view of the above problems, it is necessary to provide a gearbox assembly that can reduce the torque and bending moment of the input shaft of the gearbox and has smooth gear shifting. Summary of the Utility Model

[0005] To solve the problems in the prior art that the input shaft of the gearbox is subjected to large forces and the poor smoothness of gear shifting leads to easy impact and damage during gear shifting, the utility model provides a transmission system of a single-cylinder engine.

[0006] The utility model is realized by the following technical solutions:

[0007] A transmission system of a single-cylinder engine includes a gearbox body with a synchronizer for gear shifting. A pulley clutch is arranged on the input shaft of the gearbox body, and the pulley clutch is connected to the output shaft of the engine through a V-belt. A clutch separation mechanism capable of controlling the pulley clutch to separate or engage is arranged between the pulley clutch and the gearbox body. A bearing seat communicating with the inside of the gearbox body is arranged on the input shaft of the gearbox body, and two tapered roller bearings are arranged at the axial two ends inside the bearing seat, and the two tapered roller bearings are installed on the input shaft of the gearbox body.

[0008] The tapered roller bearing supports the input shaft entering the gearbox body, alleviating the problem of the input shaft being subjected to both torque and bending moment; the input shaft of the gearbox body is linked to the engine through a pulley clutch, which improves the smoothness of gear shifting and reduces gear shifting resistance; the gearbox body that uses synchronizer shifting has better gear shifting smoothness than traditional single-cylinder agricultural vehicle sliding gears.

[0009] A further improvement of the utility model is that a step for limiting the tapered roller bearing is provided on the input shaft inside the gearbox body; a locking nut for limiting the two tapered roller bearings in cooperation with the step is also provided in the bearing seat, and the locking nut is installed on the input shaft of the gearbox body. The step and the locking nut cooperate to limit the position of the tapered roller bearing on the input shaft.

[0010] A further improvement of the utility model is that a spacer sleeve is provided on the input shaft of the gearbox body between the two tapered roller bearings, and the spacer sleeve supports the gap between the two tapered roller bearings.

[0011] The utility model is further improved in that the pulley clutch comprises a pulley body, wherein the pulley body is provided with a pulley side cover, a driven plate, a driving plate, a driven plate, a clutch pressure plate, a disc spring and a pulley side cover arranged in sequence toward one side of the gearbox body; the driven plate, the driving plate, the driven plate and the clutch pressure plate are slidably arranged on the input shaft of the gearbox body; the clutch pressure plate is evenly provided with at least three guide bolts penetrating the pulley side cover on the side away from the driven plate, the outer end of the guide bolt is provided with a limit nut, and a separation lever with a middle section hinged on the pulley side cover is slidably provided on the guide bolt, and the other end of the separation lever is connected to the clutch separation mechanism. The clutch separation mechanism can drive the separation lever to complete the engagement or separation of the pulley clutch.

[0012] A further improvement of the utility model is that the disc spring is arranged on the side cover of the adjacent pulley and is pushed by the clutch pressure plate to squeeze the driven plate. When the release lever is not subjected to external force, the disc spring can use its own elastic force to achieve the fit of the driven plate, the active plate and the clutch pressure plate, thereby achieving the engagement state of the pulley clutch.

[0013] A further improvement of the utility model is that the driven disc and the input shaft of the gearbox body are spline-connected to form a guide for the sliding of the driven disc on the gearbox body.

[0014] A further improvement of the utility model is that a groove is provided on the inner wall of the pulley body to allow the driving plate and the clutch pressure plate to move axially.

[0015] A further improvement of the present utility model is that the above clutch separation mechanism includes a separation claw seat connected to the bearing seat. A separation claw is provided on one side of the separation claw seat. Ratchet surfaces that can cooperate with each other are provided on the opposite surfaces of the separation claw and the separation claw seat. The separation claw axially moves along the input shaft of the transmission body through the separation claw seat, and the axially moving separation bearing pushes the separation lever to complete the separation of the pulley clutch. When the separation claw rotates, it can move along the input shaft relative to the separation claw seat, thereby completing the prying of the separation lever.

[0016] A further improvement of the present utility model is that an oil seal that mates with the input shaft of the transmission body is provided on one side of the separation claw seat close to the bearing seat.

[0017] A further improvement of the present utility model is that a V-belt groove is provided on the outer wall of the pulley body, and a V-belt that mates with the engine output shaft is sleeved in the V-belt groove. This improves the transmission effect.

[0018] It can be seen from the above technical solutions that the beneficial effects of the present utility model are as follows: The tapered roller bearing supports the input shaft entering the transmission body, alleviating the problem that the input shaft here is subjected to both torque and bending moment; the input shaft of the transmission body is linked with the engine through the pulley clutch, improving the smoothness of gear shifting and reducing the gear shifting resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the present utility model, the drawings required for description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 It is a schematic structural diagram of the specific embodiment of the present utility model.

[0021] Figure 2 It is a schematic diagram of the pulley clutch of the specific embodiment of the present utility model.

[0022] Figure 3 It is an exploded view of the separation claw and the separation claw seat of the specific embodiment of the present utility model.

[0023] In the drawings: 1. Transmission body; 2. Bearing seat; 21. Tapered roller bearing; 22. Sleeve; 23. Locking nut; 3. Pulley clutch; 31. Pulley side cover; 32. Driven disc; 33. Driving disc; 34. Clutch pressure plate; 35. Disc spring; 36. Guide bolt; 37. Separation lever; 38. Pulley body; 39. V-belt groove; 4. Clutch separation mechanism; 41. Separation claw seat; 42. Separation claw; 43. Separation bearing. Detailed implementation mode

[0024] In order to make the purpose, features, and advantages of the present utility model more obvious and understandable, the technical solutions in the present utility model will be clearly and completely described below in conjunction with the drawings in this specific embodiment. Obviously, the embodiments described below are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments in this patent, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of this patent.

[0025] As shown in the attached Figures 1-3 figure, a single-cylinder engine transmission system includes a transmission body 1 with a synchronizer for shifting gears. The transmission body with a synchronizer for shifting gears has better shifting smoothness compared to the sliding gears of traditional single-cylinder agricultural vehicles; on the input shaft of the transmission body 1, a bearing seat 2, a clutch release mechanism 4, and a pulley clutch 3 are successively arranged outward. The bearing seat 2 is internally connected to the transmission body 1. At both axial ends inside the bearing seat 2, two tapered roller bearings 21 are provided. The two tapered roller bearings 21 are installed on the input shaft of the transmission body 1; the tapered roller bearings 21 support the input shaft entering the transmission body 1, alleviating the problem that the input shaft here is subjected to both torque and bending moment. On the input shaft of the transmission body 1 between the two tapered roller bearings 21, a spacer sleeve 22 is provided. The spacer sleeve 22 supports the gap between the two tapered roller bearings 21. On the input shaft inside the transmission body 1, there is a step for limiting the tapered roller bearings 21; inside the bearing seat 2, there is also a locking nut 23 that cooperates with the step to limit the two tapered roller bearings 21. The step and the locking nut 23 cooperate to complete the position limitation of the tapered roller bearings 21 on the input shaft.

[0026] The clutch release mechanism 4 is arranged between the pulley clutch 3 and the transmission body 1 and can control the pulley clutch 3 to achieve separation or engagement.

[0027] The clutch release mechanism 4 includes a release claw seat 41 connected to the bearing seat 2. On one side of the release claw seat 41, there is a release claw 42. On the opposite surface of the release claw 42 and the release claw seat 41, there are ratchet surfaces that can cooperate with each other. That is to say, taking the release claw 42 as an example, at least two inclined surfaces are provided on the surface of the release claw 42 close to the release claw seat 41, and there is a step drop between adjacent inclined surfaces; the release claw 42 moves axially along the input shaft of the transmission body 1 through the release claw seat 41, and the axially moving release bearing 43 pushes the release lever 37 to complete the separation of the pulley clutch 3. When the release claw 42 rotates, it can move along the input shaft with the release bearing 43, thereby completing the prying of the release lever 37.

[0028] An oil seal matching the input shaft of the gearbox body 1 is provided on one side of the separation claw seat 41 close to the bearing seat 2 .

[0029] The pulley clutch 3 is connected to the output shaft of the engine through a V-belt. The input shaft of the gearbox body 1 is linked with the engine through the pulley clutch 3, which improves the smoothness of gear shifting and reduces gear shifting resistance.

[0030] The pulley clutch 3 comprises a pulley body 38, wherein the pulley body 38 is provided with a pulley side cover 31, a driven plate 32, a driving plate 33, a driven plate 32, a clutch pressure plate 34 and a pulley side cover 31 arranged in sequence toward one side of the gearbox body 1; the driven plate 32 is spline-connected with the input shaft of the gearbox body 1. A guide is formed for the sliding of the driven plate 32 on the gearbox body 1. The pulley side cover 31 is provided with a disc spring 35 for pushing the clutch pressure plate 34 to squeeze the driven plate 32. When the separation lever 37 is not subjected to external force, the disc spring 35 can use its own elastic force to achieve the fit of the driven plate 32, the driving plate 33 and the clutch pressure plate 34, thereby achieving the engagement state of the pulley clutch 3. The driven plate 32, the driving plate 33, the driven plate 32 and the clutch pressure plate 34 are slidably arranged on the input shaft of the gearbox body 1; the clutch pressure plate 34 is evenly provided with at least three guide bolts 36 penetrating the pulley side cover 31 on the side away from the driven plate 32, and the outer end of the guide bolt 36 is provided with a limit nut, and a separation lever 37 with a middle section hinged on the pulley side cover 31 is slidably arranged on the guide bolt 36, and the other end of the separation lever 37 is connected to the clutch separation mechanism 4. The clutch separation mechanism 4 can drive the separation lever 37 to complete the engagement or separation of the pulley clutch 3.

[0031] The inner wall of the pulley body 38 is provided with a groove that allows the driving plate 33 and the clutch pressure plate 34 to move axially.

[0032] The outer wall of the pulley body 38 is provided with a V-belt groove 39, and a V-belt matching the engine output shaft is sleeved in the V-belt groove 39 to improve the transmission effect.

[0033] When the gearbox body 1 is shifted, first the clutch separation mechanism 4 drives the pulley clutch 3 to work, cutting off the power between the engine and the gearbox input shaft; then the shift mechanism is operated to make the synchronizer work to complete the gear shift.

[0034] When the gearbox works normally, the friction force generated by the friction surface causes the driven plate 32 and the pulley body 38 to rotate together, transmitting the power of the engine to the input shaft of the gearbox body 1.

[0035] When shifting gears, the separating claw 42 rotates around the input shaft. Under the cooperation of the ratchet surface of the separating claw seat 41 and the separating claw 42, the separating claw 42 drives the release bearing 43 to move axially. At this time, the release lever 37 rotates, and the other end of the release lever 37 drives the guide bolt 36 and the clutch pressure plate 34 to move axially (in the direction opposite to the release bearing 43), overcoming the pressure of the disc spring 35, separating the contact surfaces of the driven disc 32, the pulley side cover 31, the driving disc 33, and the clutch pressure plate 34, and cutting off the power between the transmission and the engine to shift gears.

[0036] In the transmission system of a single-cylinder engine according to the present utility model, the tapered roller bearings support the input shaft entering the transmission body, alleviating the problem that the input shaft is subjected to both torque and bending moment here; the input shaft of the transmission body is linked with the engine through a pulley clutch, improving the smoothness of gear shifting and reducing the gear shifting resistance.

[0037] In this specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same and similar parts among the various embodiments, reference may be made to each other.

[0038] Terms such as "upper", "lower", "outer side", "inner side", etc. in the specification, claims and above-mentioned drawings of the present utility model, if any, are used to distinguish the relative positions and do not need to be qualitatively defined. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of the present utility model described herein can be implemented in an order different from those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion.

[0039] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A single-cylinder engine transmission system, comprising a gearbox body (1), characterized in that: A pulley clutch (3) is provided on the input shaft of the gearbox body (1), and the pulley clutch (3) is connected to the output shaft of the engine via a V-belt; a clutch separation mechanism (4) capable of controlling the pulley clutch (3) to separate or engage is provided between the pulley clutch (3) and the gearbox body (1); A bearing seat (2) which is in communication with the interior of the gearbox body (1) is provided on the input shaft of the gearbox body (1); two tapered roller bearings (21) are provided at two axial ends of the inner side of the bearing seat (2); and the two tapered roller bearings (21) are mounted on the input shaft of the gearbox body (1).

2. A single-cylinder engine transmission system according to claim 1, characterized in that: The input shaft inside the gearbox body (1) is provided with a step for limiting the tapered roller bearing (21); the bearing seat (2) is also provided with a locking nut (23) that matches the step and limits the two tapered roller bearings (21); the locking nut (23) is mounted on the input shaft of the gearbox body (1).

3. A single-cylinder engine transmission system according to claim 2, characterized in that: A spacer sleeve (22) is provided on the input shaft of the gearbox body (1) between the two tapered roller bearings (21).

4. A single-cylinder engine transmission system according to any one of claims 1 to 3, characterized in that: The pulley clutch (3) comprises a pulley body (38), wherein the pulley body (38) is provided with a pulley side cover (31), a driven plate (32), a driving plate (33), a driven plate (32), a clutch pressure plate (34), a disc spring (35) and a pulley side cover (31) arranged in sequence toward one side of the gearbox body (1); the driven plate (32), the driving plate (33), the driven plate (32) and the clutch pressure plate (34) are slidably arranged on the input shaft of the gearbox body (1); at least three guide bolts (36) penetrating the pulley side cover (31) are evenly distributed on the side of the clutch pressure plate (34) away from the driven plate (32), and the outer end of the guide bolt (36) is provided with a limit nut, and a separation lever (37) is slidably provided on the guide bolt (36), the middle section of which is hinged on the pulley side cover (31), and the other end of the separation lever (37) is connected to the clutch separation mechanism (4).

5. A single-cylinder engine transmission system according to claim 4, characterized in that: The disc spring (35) is arranged on the adjacent pulley side cover (31) and is pushed by the clutch pressure plate (34) to press the driven plate (32).

6. A single-cylinder engine transmission system according to claim 5, characterized in that: The driven disc (32) and the input shaft of the gearbox body (1) are spline-connected.

7. A single-cylinder engine transmission system according to claim 4, characterized in that: The inner wall of the pulley body (38) is provided with a groove for allowing the driving plate (33) and the clutch pressure plate (34) to move axially.

8. A single-cylinder engine transmission system according to claim 4, characterized in that: The clutch separation mechanism (4) comprises a separation claw seat (41) connected to the bearing seat (2), a separation claw (42) is provided on one side of the separation claw seat (41), and the separation claw (42) and the separation claw seat (41) are provided with ratchet surfaces that can cooperate with each other on the opposite surfaces. The separation claw (42) moves axially along the input shaft of the gearbox body (1) through the separation claw seat (41), and the axially moving separation bearing (43) pushes the separation lever (37) to complete the separation of the pulley clutch (3).

9. A single-cylinder engine transmission system according to claim 8, characterized in that: An oil seal matching the input shaft of the gearbox body (1) is provided on one side of the separation claw seat (41) close to the bearing seat (2).

10. A single-cylinder engine transmission system according to claim 4, characterized in that: A V-belt groove (39) is provided on the outer wall of the pulley body (38), and a V-belt matched with the output shaft of the engine is sleeved in the V-belt groove (39).

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