Engine parking mechanism for all-terrain vehicle
The eccentric design of the gear shift drum assembly, parking arm, and cylindrical pin simplifies the machining process of the all-terrain vehicle parking mechanism, reduces costs, maintains high reliability, and solves the problem of complex cam structure machining.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANDONG SHENGWO NEW ENERGY DEV CO LTD
- Filing Date
- 2025-05-30
- Publication Date
- 2026-05-15
AI Technical Summary
The machining process for the cam structure of existing all-terrain vehicles is complex and costly.
It adopts a combination of a transmission drum assembly, parking arm, shift fork shaft and parking gear, combined with the eccentric design of cylindrical pin and transmission drum assembly, and realizes the meshing and release movement of parking arm and parking gear through irregular elliptical surface, replacing the traditional cam structure.
It simplifies the manufacturing process and reduces costs of the parking mechanism while maintaining high reliability and strength.
Smart Images
Figure CN224245403U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of engine parking technology, specifically to an engine parking mechanism for all-terrain vehicles. Background Technology
[0002] The parking mechanism of an all-terrain vehicle (ATV) is a key component that prevents the vehicle from sliding when parked. It uses a gear meshing stop to achieve power locking through mechanical meshing, thereby completing the parking operation. It features a simple structure, high durability and high reliability.
[0003] Specifically, this involves a mechanical hard lock between the parking gear and the parking arm, directly acting on the drive shaft in the vehicle's drivetrain (such as the transmission output shaft or differential input shaft). This design does not rely on the braking system but directly blocks the drivetrain, thus providing stronger braking force. The key component controlling the movement of the parking arm, allowing the parking arm and parking gear to switch between engaged (parking) and disengaged (non-parking) states, is the cam structure on the gear drum. The special profile of the cam structure converts rotational motion into linear displacement or swing angle of the parking arm, pushing the parking arm into the tooth groove of the parking gear. This design balances reliability, cost, and user experience, making it particularly suitable for all-terrain vehicle scenarios with low requirements for electronic system tolerance and high mechanical strength requirements.
[0004] However, in vehicle design and production, we found that the eccentric shape of this cam structure requires multiple turning operations, which is a complex process and has high processing costs. Therefore, we are committed to designing a new parking mechanism that can achieve the same reliability and stability as the cam structure, while simplifying the processing complexity and reducing processing costs. Utility Model Content
[0005] The purpose of this invention is to provide an engine parking mechanism for all-terrain vehicles, in order to solve the problems of complex processing and high processing cost of existing cam structures mentioned in the background art.
[0006] To achieve the above objectives, this utility model provides the following technical solution: an engine parking mechanism for an all-terrain vehicle, comprising a gear shift drum assembly, a parking relief plate fixedly mounted on the shaft end of the gear shift drum assembly, a parking arm sleeved inside the parking relief plate on the outer side of the shaft end of the gear shift drum assembly, a mounting hole provided at one end of the parking arm, a toothed groove provided on the side wall of the other end of the parking arm, a parking gear provided on one side of the toothed groove, a shift fork shaft rotatably connected to the middle of the parking arm, a cylindrical pin fixedly mounted inside the mounting hole at the shaft end of the gear shift drum assembly, the cylindrical pin being eccentrically designed with respect to the axis of the gear shift drum assembly, and the outline of the mounting hole being an irregular elliptical surface smoothly formed by a set of cross-sectional profiles.
[0007] As a further technical solution of this utility model, the parking unloading plate is ring-shaped, and an L-shaped bending plate is integrally provided on one side of the parking unloading plate.
[0008] As a further technical solution of this utility model, the parking arm is provided with a "C" shaped groove on the side near the mounting hole, which can accommodate the "L" shaped bending plate.
[0009] As a further technical solution of this utility model, the speed change drum assembly includes a speed change drum, a transmission shaft is provided inside the speed change drum, and a shaft elastic retaining ring is provided on the contact end face of the transmission shaft and the speed change drum.
[0010] As a further technical solution of this utility model, the tooth groove and the parking gear can mesh with each other.
[0011] As a further technical solution of this utility model, the profile of the mounting hole includes a release state portion and an engagement state portion, and the release state portion and the engagement state portion are connected end to end.
[0012] As a further technical solution of this utility model, the diameter of the cylindrical pin is d1, the diameter of the shaft end of the transmission drum is d2, the length of the release state part from the nearest point of the transmission drum shaft center is d3, d3≥d1+1 / 2d2, and the length of the engagement state part from the nearest point of the transmission drum shaft center is d4, d4 <d1+1 / 2d2。
[0013] Compared with the prior art, the beneficial effects of this utility model are: the parking mechanism has the advantages of being lighter, having a simpler parts processing process, and lower processing costs, and has great utilization value;
[0014] (1) By setting up the gear shift drum assembly, parking arm, shift fork shaft and parking gear, the parking mechanism forms a complete lever parking actuator, thereby achieving the requirements of compact structure and high parking reliability.
[0015] (2) By setting a cylindrical pin, the cylindrical pin and the axis of the transmission drum assembly are designed to be eccentric. In addition, the irregular elliptical surface is formed by the smooth transition of the profile of the mounting hole. This enables the oscillating reciprocating motion between the toothed end of the parking arm 3 and the parking gear to complete the meshing state (parking state) and the gear release state (non-parking state). This replaces the original cam structure and has the advantages of lighter overall weight, simpler processing process, and lower processing cost. Attached Figure Description
[0016] Figure 1 This is a three-dimensional structural diagram of the present invention in its non-parked state;
[0017] Figure 2This is a top view of the present invention in its non-parked state;
[0018] Figure 3 This is a three-dimensional structural diagram of the present invention in the parked state;
[0019] Figure 4 This is a top view of the present invention in the parked state.
[0020] In the diagram: 1. Gearbox assembly; 11. Gearbox; 12. Drive shaft; 13. Shaft retaining ring; 2. Parking relief plate; 21. L-shaped bending plate; 3. Parking arm; 31. Mounting hole; 311. Release state section; 312. Engagement state section; 32. Gear groove; 33. "C" groove; 4. Parking gear; 5. Shift fork shaft; 6. Cylindrical pin. Detailed Implementation
[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0022] Example: Please refer to Figure 1-4 An engine parking mechanism for an all-terrain vehicle includes a gear shift drum assembly 1, which includes a gear shift drum 11. A drive shaft 12 is disposed inside the gear shift drum 11. A shaft elastic retaining ring 13 is disposed on the contact end face between the drive shaft 12 and the gear shift drum 11. The gear shift drum is mounted in the transmission housing through bearings. The spiral groove on its surface cooperates with the guide pin of the shift fork to convert the rotational motion into the axial movement of the shift fork, thereby realizing the switching of different gears.
[0023] A parking arm 3 is fitted inside the parking relief plate 2 on the outer side of the shaft end of the transmission drum assembly 1. One end of the parking arm 3 has a mounting hole 31, and the other end of the parking arm 3 has a toothed groove 32 on its side wall. A parking gear 4 is provided on one side of the toothed groove 32. The toothed groove 32 and the parking gear 4 can mesh with each other. A shift fork shaft 5 is rotatably connected to the middle of the parking arm 3. When one end of the parking arm 3 is subjected to force and displacement occurs, a set of lever structures is formed through the shift fork shaft 5 in the middle as the fulcrum of rotation. This allows the toothed groove 32 at the other end of the parking arm 3 to move closer to or further away from the parking gear 4, thereby achieving the purpose of parking and non-parking.
[0024] A cylindrical pin 6 is fixedly installed inside the shaft end mounting hole 31 of the transmission drum assembly 1. The cylindrical pin 6 can be fixed by first opening a round hole on the transmission drum 11 and pressing the cylindrical pin 6 and the round hole into the hole with an interference fit, or by opening a threaded hole to fix the two by thread, or even by welding. The principle will not be elaborated in detail here. The cylindrical pin 6 is eccentrically designed with respect to the axis of the transmission drum assembly 1. The cylindrical pin 6 and the mounting hole 31 of the parking arm 3 are both located below the shaft elastic retaining ring 13. The outline of the mounting hole 31 is formed by a set of cross-sectional profiles smoothly transitioned together. The irregular elliptical surface of the mounting hole 31 includes a release state portion 311 and an engagement state portion 312. The release state portion 311 and the engagement state portion 312 are connected end to end. When the cylindrical pin 6 is within the range of the release state portion 311 of the mounting hole 31, the cylindrical pin 6 contacts the side wall of the release state portion 311, causing the mounting hole 31 end of the parking arm 3 to move in the direction of the release state portion 311. At this time, the tooth groove 32 at the other end of the parking arm 3 moves away from the parking gear 4, and the tooth groove 32 and the parking gear 4 separate. At this time, the vehicle is in a non-parking state.
[0025] As the cylindrical pin 6 continues to rotate with the transmission drum 11 and enters the range of the engagement state section 312, the mounting hole 31 end of the parking arm 3 will move towards the engagement state section 312 until the tooth groove 32 is fully engaged with the parking gear 4, and the cylindrical pin 6 will also be stuck between the shaft end of the transmission drum 11 and the mounting hole 31, so that the vehicle enters the parking state.
[0026] Furthermore, the diameter of the cylindrical pin 6 is d1, the shaft end diameter of the transmission drum 11 is d2, the length of the release state section 311 from the nearest point of the axis of the transmission drum 11 is d3, d3≥d1+1 / 2d2, and the length of the engagement state section 312 from the nearest point of the axis of the transmission drum 11 is d4, d4 <d1+1 / 2d2。
[0027] Furthermore, in order to eliminate the reverse force borne by the cylindrical pin 6, a parking relief plate 2 is fixedly installed at the shaft end of the transmission drum assembly 1. The parking relief plate 2 is annular, and an L-shaped bending plate 21 is integrally provided on one side of the parking relief plate 2. A C-shaped groove 33 that can accommodate the L-shaped bending plate 21 is provided on the side of the parking arm 3 near the mounting hole 31. When the vehicle enters the parking state, the L-shaped bending plate 21 is inserted into the C-shaped groove 33 to offset the force borne by the cylindrical pin 6.
[0028] Working principle: When using this utility model, the driver first drives the gear shift drum assembly 1 by operating the gear shift lever, causing the parking arm 3 to swing back and forth around the shift fork shaft 5 as the fulcrum. This allows the toothed end 32 of the parking arm 3 to engage (parking state) and release (non-parking state) with the parking gear 4 as needed by the operator.
[0029] Because the axis of the cylindrical pin 6 and the gear drum 1 is eccentrically designed, with the cooperation of the cylindrical pin 6 and the release state part 311 and the engagement state part 312 of the parking arm 3, the parking arm 3 can rotate around the shift fork shaft 5 as the pivot point, and drive the tooth groove 32 end of the parking arm 3 to achieve the engagement state (parking state) and the gear release state (non-parking state) with the parking gear 4.
[0030] It will be apparent to those skilled in the art that this invention 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 essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
Claims
1. An engine parking mechanism for an all-terrain vehicle, comprising a transmission drum assembly (1), characterized in that: The shaft end of the gear drum assembly (1) is fixedly provided with a parking relief plate (2). The parking relief plate (2) on the outer side of the shaft end of the gear drum assembly (1) is fitted with a parking arm (3). One end of the parking arm (3) is provided with a mounting hole (31). The side wall of the other end of the parking arm (3) is provided with a tooth groove (32). A parking gear (4) is provided on one side of the tooth groove (32). The middle part of the parking arm (3) is rotatably connected with a shift fork shaft (5). A cylindrical pin (6) is also fixedly provided inside the mounting hole (31) at the shaft end of the gear drum assembly (1). The cylindrical pin (6) is eccentrically designed with respect to the axis of the gear drum assembly (1). The outline of the mounting hole (31) is an irregular elliptical surface formed by a smooth transition of a set of cross-sectional profiles.
2. The engine parking mechanism for an all-terrain vehicle according to claim 1, characterized in that: The parking unloading plate (2) is ring-shaped, and an L-shaped bending plate (21) is integrally provided on one side of the parking unloading plate (2).
3. The engine parking mechanism for an all-terrain vehicle according to claim 2, characterized in that: The parking arm (3) has a C-shaped groove (33) on the side near the mounting hole (31) that can accommodate the L-shaped bending plate (21).
4. The engine parking mechanism for an all-terrain vehicle according to claim 1, characterized in that: The gear shift drum assembly (1) includes a gear shift drum (11), and a drive shaft (12) is provided inside the gear shift drum (11). A shaft elastic retaining ring (13) is provided on the contact end face between the drive shaft (12) and the gear shift drum (11).
5. The engine parking mechanism for an all-terrain vehicle according to claim 1, characterized in that: The tooth groove (32) can mesh with the parking gear (4).
6. The engine parking mechanism for an all-terrain vehicle according to claim 4, characterized in that: The profile of the mounting hole (31) includes a release state portion (311) and an engagement state portion (312), which are connected end to end.
7. An engine parking mechanism for an all-terrain vehicle according to claim 6, characterized in that: The diameter of the cylindrical pin (6) is d1, the diameter of the shaft end of the gear shift drum (11) is d2, the length of the release state part (311) from the nearest point of the gear shift drum (11) is d3, d3≥d1+1 / 2d2, and the length of the engagement state part (312) from the nearest point of the gear shift drum (11) is d4, d4 <d1+1 / 2d2。