Parking and gear shifting interlocking safety mechanism for tractor

Abstract

The invention discloses a parking and gear shifting interlocking safety mechanism for a tractor, and belongs to the field of tractor gearbox design. The gear shifting mechanism comprises a shaft assembly, a first gear shifting shaft, a second gear shifting shaft, a lock plate and a lock plate. The middle of the lock plate is hinged to the first gear shifting shaft, one end of the lock plate is slidably connected with the second gear shifting shaft through the shifting notch, and the other end of the lock plate is provided with a passing notch. The locking plate is fixedly connected to a swing arm of the shaft assembly and provided with an arc-shaped strip coaxial with the shaft assembly. According to the mechanical interference principle of swinging of the lock plate and arc-shaped movement of the lock plate, only when the gear shifting shaft is in a neutral gear, parking operation is allowed to be executed through the fact that the notch is right opposite to the lock plate, and after parking, the lock plate penetrates into the notch to lock the gear shifting shaft, and gear engaging cannot be achieved; when the gear shifting shaft is in a gear engaging position, the side wall of the lock plate blocks the movement path of the lock plate, and the parking state is forbidden. According to the mechanism, the interlocking function of parking and gear shifting is achieved through pure mechanical structure linkage, and the problem of gear tooth breaking or damage of a gearbox gear caused by misoperation is effectively avoided.

Description

Technical Field

[0001] This invention belongs to the field of tractor gearbox design, specifically relating to a parking and shifting interlock safety mechanism for tractors, which realizes separate control and interlocking functions for parking and shifting. Background Technology

[0002] Currently, the gear lock-up parking mechanism and the shifting mechanism in tractor gearboxes are independent of each other, lacking a linkage control mechanism. This leads to the following problems in practical use: The driver mistakenly engaged drive gear while the vehicle was parked, resulting in gear damage. The driver mistakenly engaged the parking gear while the vehicle was in motion, causing the gears to grind and become damaged. Summary of the Invention

[0003] This invention aims to provide a parking and shifting interlock safety mechanism for tractors, realizing the interlock function between parking and shifting. The specific technical solution is as follows: A parking and shifting interlock safety mechanism for a tractor includes a shaft assembly rotatably mounted on a gearbox housing, and shift shaft one and shift shaft two slidably mounted on the gearbox housing, wherein the centerline of the shaft assembly is perpendicular to the centerlines of shift shaft one and shift shaft two, and further includes: A locking plate has a hinge hole in the middle of its body and a through slot and a toggle slot at each end. The locking plate is hinged to the first shift shaft by a first fastener passing through the hinge hole. A second fastener is fixed to the second shift shaft and is slidably connected to it in the toggle slot, so that when the first shift shaft and the second shift shaft are relatively displaced, the locking plate can be rotated around the first fastener. A locking plate is fixedly connected to the swing arm connected to the shaft assembly. The locking plate has an arc-shaped strip, and the axis of the arc-shaped body of the arc-shaped strip is coaxial with the shaft assembly. Specifically, when the first and second shift shafts are in neutral, the movement path of the through slot is aligned with that of the arc-shaped bar, allowing the shaft assembly to rotate and drive the locking plate through the through slot to enter the parking state; when the locking plate passes through the through slot, the arc-shaped bar and the through slot form a blocking engagement to restrict the rotation of the locking plate, thereby locking the axial displacement of the first and second shift shafts; when the first or second shift shaft is in gear, the side wall of the locking plate at the through slot provides a blocking limit to the locking plate, thereby restricting the shaft assembly from rotating in the parking direction.

[0004] Furthermore, the main body of the locking piece is the arc-shaped strip, and the left and right ends of the arc-shaped strip are respectively fixedly connected to the swing arm through the left end connecting part and the right end connecting part.

[0005] Furthermore, when the first shift shaft or the second shift shaft is in the gear position, the side wall of the locking plate at the end where the slot is located forms a blocking and limiting action on the right end connecting part of the locking piece.

[0006] Furthermore, the first fastener is bolt one, and the second fastener is bolt two.

[0007] Furthermore, the first shift shaft synchronously drives the first shift fork, and the second shift shaft synchronously drives the second shift fork.

[0008] Furthermore, when the shaft assembly is in a non-parking state, the locking plate is axially offset from the locking plate to release the restriction on the displacement of the first shift shaft and the second shift shaft.

[0009] This invention has the function of preventing misoperation, and can effectively avoid gear damage caused by shifting gears while parked or accidentally parking while driving. Attached Figure Description

[0010] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 A schematic diagram of an embodiment of the shaft assembly control mechanism as seen from the outside of the gearbox; Figure 3 An exploded view of an embodiment of the parking control structure associated with the axle assembly; Figure 4 This is a structural diagram of the shaft assembly and locking plate combination; Figure 5 Here is a diagram of the lock plate structure; Figure 6 Diagram showing the state where the shift shaft 20 is engaged and the locking plate 19 blocks the locking piece 32; Figure 7 This is a diagram showing the state of the shift shaft 21 after shifting gears, with the locking plate 19 blocking the locking piece 32.

[0012] The reference numerals in the diagram are as follows: 1. Housing; 2. Parking control arm; 3. Shaft assembly; 4. Swing arm position spring; 5. Limit pin one; 6. Fixing plate; 7. Limit pin two; 8. Separation plate; 9. Drive spring; 10. Support plate; 11. Camshaft; 12. Pin; 13. Roller sleeve; 14. Gear plate; 15. Gear plate return spring; 16. Gear plate fixing shaft; 18. Drive inclined surface; 19. Locking plate; 20. Shift shaft one; 21. Shift shaft two; 22. Bolt one; 23. Bolt two; 24. Shift fork two; 25. Shift fork one; 111. Shaft body; 112. Cam body; 141. Rack; 31. Swing arm; 32. Locking plate; 311. Pin; 81. Long hole. Hinge hole 190, through slot 191, actuating slot 192, arc strip 321, right end connecting part 322, left end connecting part 323. Detailed Implementation

[0013] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0014] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0015] As shown in the figure, the present invention includes a shaft assembly 3, a shift shaft 1 20 and a shift shaft 21 respectively installed on the gearbox housing 1, and also includes a locking plate 19 and a locking piece 32.

[0016] Shaft assembly 3 is used for parking control. This invention provides a specific embodiment of a parking control mechanism. For the specific structure and working principle, please refer to the independent control structure for locking the gearbox of a tractor in CN224049678U. It will not be repeated here.

[0017] The rotation of the shaft assembly 3 can be achieved by the parking handle through a flexible shaft or pull rod to drive the parking control arm 2 to flip. The specific transmission connection structure is a conventional technology and will not be described in detail here.

[0018] The centerlines of shift shaft 1 20 and shift shaft 21 are parallel to each other and can slide relative to housing 1 along their respective centerlines; the centerline of shaft assembly 3 is perpendicular to the centerlines of shift shaft 1 20 and shift shaft 21, and shaft assembly 3 can rotate on housing 1 around its own centerline. The shift shaft 1 20 synchronously drives the shift fork 1 25, and the shift shaft 2 synchronously drives the shift fork 24 for shifting gears. The specific shifting structure and working principle are existing technologies and will not be described in detail in this article.

[0019] See Figure 5 As shown, the locking plate 19 has a hinge hole 190 in the middle and through slots 191 and actuation slots 192 at both ends. The locking plate 19 is positioned above the shift shaft 1 20 and the shift shaft 2 21. The locking plate 19 is hinged to the shift shaft 1 20 via a bolt 1 22 passing through a hinge hole 190. The locking plate 19 faces the shaft assembly 3 via a slot 191, and the shifting slot 192 faces the shift shaft 2. The shift shaft 2 is fixedly connected to a bolt 2 23, which passes through the shifting slot 192 and is slidably connected to it. When the shift shaft 1 20 and the shift shaft 2 21 are relatively displaced, the locking plate 19 can be rotated around the bolt 1 22 through the sliding cooperation between the bolt 2 23 and the shifting slot 192.

[0020] The present invention welds and fixes a locking piece 32 to the rocker arm 31 connected to the existing shaft assembly 3. Specifically, in conjunction with... Figure 4 As shown, the main body of the locking piece 32 is an arc-shaped strip 321. The axis of the arc-shaped body of the arc-shaped strip 321 is coaxial with the shaft assembly 3. The left and right ends of the arc-shaped strip 321 are fixed to the swing arm 31 through the left end connecting part 323 and the right end connecting part 322, respectively. When shift shaft 1 20 and shift shaft 2 21 are in neutral (e.g.) Figure 1 As shown), the right end connecting part 322 and the arc-shaped strip 321 are directly opposite each other through the slot 191. The right end connecting part 322 and the arc-shaped strip 321 can pass through the slot 191 in sequence under the rotation of the shaft assembly 3, that is, the vehicle can enter the parking state at this time. When the arc-shaped bar 321 passes through the slot 191, the locking plate 19 is restricted from rotating around the bolt 22 due to the blocking action of the arc-shaped bar 321 and the slot 191. This prevents the shift shaft 20 or the shift shaft 21 from moving independently along the axis. In other words, when the vehicle is in the parking state, the shift shaft 20 and the shift shaft 21 are locked and cannot move back and forth, thus preventing gear shifting. When shift shaft 1 20 or shift shaft 2 21 is in the gear position (e.g.) Figure 6 , Figure 7 As shown), the end of the locking plate 19 with the slot 191 can block and limit the right end connecting part 322 of the arc strip 321, restricting the rotation of the shaft assembly 3, thereby restricting the parking gear from being engaged, i.e., preventing the vehicle from entering the parking state. When shaft assembly 3 is in the non-parking position (e.g.) Figure 1 As shown), the locking plate 32 is higher than the locking plate 19, and the shift shaft 1 20 and shift shaft 21 can move back and forth to achieve shifting.

[0021] This invention achieves an interlock function between parking and gear shifting by cooperating with the locking plate 19, as detailed below: When the parking lever is in the neutral position, i.e., in the non-parking state, the transmission can shift gears normally; When the parking lever is in the parking position, i.e., in the parking state, the transmission can only be in neutral and cannot be shifted into gear; Parking is permitted when the gear shift lever is in the neutral position, i.e., in neutral. Parking is prohibited when the gear shift lever is not in the neutral position, i.e., when it is not in neutral (engaged).

[0022] Through the linkage of the mechanical structure, it is ensured that the vehicle cannot be parked when it is not in neutral, and cannot be shifted when parked, thus completely avoiding gear damage or tooth breakage caused by misoperation.

[0023] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A parking and shifting interlock safety mechanism for a tractor, comprising a shaft assembly (3) rotatably mounted on a gearbox housing (1), and a shift shaft one (20) and a shift shaft two (21) slidably mounted on the gearbox housing (1), wherein the axis of the shaft assembly (3) is perpendicular to the axis of the shift shaft one (20) and the shift shaft two (21), characterized in that, Also includes: The locking plate (19) has a hinge hole (190) in the middle of its body and a through slot (191) and a toggle slot (192) at both ends of its body. The locking plate (19) is hinged to the first shift shaft (20) through the hinge hole (190) by a first fastener. A second fastener is fixed on the second shift shaft (21). The second fastener passes through the toggle slot (192) and slides therewith, so that when the first shift shaft (20) and the second shift shaft (21) are relatively displaced, the locking plate (19) can be toggle around the first fastener. Locking plate (32), the locking plate (32) is fixedly connected to the swing arm (31) connected to the shaft assembly (3), the locking plate (32) has an arc-shaped strip (321), the axis of the arc-shaped body of the arc-shaped strip (321) is coaxial with the shaft assembly (3); When the first shift shaft (20) and the second shift shaft (21) are in neutral, the movement paths of the through slot (191) and the arc strip (321) are aligned, allowing the shaft assembly (3) to rotate and drive the locking piece (32) through the through slot (191) to enter the parking state; when the locking piece (32) passes through the through slot (191), the arc strip (321) and the through slot (191) form a blocking engagement to restrict the rotation of the locking plate (19), thereby locking the axial displacement of the first shift shaft (20) and the second shift shaft (21); when the first shift shaft (20) or the second shift shaft (21) is in gear, the side wall of the end where the through slot (191) of the locking plate (19) is located forms a blocking limit on the locking piece (32) to restrict the shaft assembly (3) from rotating in the parking direction.

2. The parking and shifting interlock safety mechanism for a tractor according to claim 1, characterized in that, The main body of the locking piece (32) is the arc-shaped strip (321), and the left and right ends of the arc-shaped strip (321) are fixedly connected to the swing arm (31) through the left end connecting part (323) and the right end connecting part (322) respectively.

3. The parking and shifting interlock safety mechanism for a tractor according to claim 2, characterized in that, When the first shift shaft (20) or the second shift shaft (21) is in the gear position, the side wall of the lock plate (19) through the slot (191) forms a blocking limit on the right end connection part (322) of the lock piece (32).

4. The parking and shifting interlock safety mechanism for a tractor according to claim 1, characterized in that, The first fastener is bolt one (22), and the second fastener is bolt two (23).

5. A parking and shifting interlock safety mechanism for a tractor according to claim 1, characterized in that, The first shift shaft (20) synchronously drives the first shift fork (25), and the second shift shaft (21) synchronously drives the second shift fork (24).

6. A parking and shifting interlock safety mechanism for a tractor according to claim 1, characterized in that, When the shaft assembly (3) is in a non-parking state, the locking plate (32) is axially offset from the locking plate (19) to release the restriction on the displacement of the first shift shaft (20) and the second shift shaft (21).

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