A manual gear shift mechanism

Abstract

The utility model discloses a manual gear shifting mechanism, including sealed connection's upper casing and lower casing and be located in its gear shifting control subassembly, gear shifting execution subassembly and gear lock and interlock subassembly. Gear lock subassembly moves through the piston rod of oil cylinder drive, and the positioner of spring reset is coordinated, realizes the double function of hydraulic unlocking before gear shifting and mechanical strong lock after gear shifting. Gear shifting execution subassembly drives the shift fork of fixed shift axle to complete the selection and the gear hanging through the selection rod drive the actuator. The cooperation of interlock subassembly utilizes the stop ball and the side gap of shift axle, prevents the double axle gear hanging simultaneously. The utility model also is equipped with the adjusting screw, can flexible restriction positioner stroke, realizes 2, 3, 4 gear adjustable setting. The mechanism has the advantages of light operation, lock reliable, prevent the gear, prevent the gear, adaptability wide.

Description

Technical Field

[0001] This utility model relates to the field of agricultural machinery transmission technology, specifically to a manual gear shifting mechanism for agricultural vehicles or equipment. Background Technology

[0002] Existing manual gear shifting mechanisms for agricultural applications often suffer from problems such as uneven shifting, inflexible gear selection, and a lack of reliable locking functions. This leads to laborious operation, susceptibility to errors, and the tendency for gears to loosen or skip gears after prolonged use, affecting the stability and safety of the equipment. Therefore, there is a need for a manual gear shifting mechanism that is simple in structure, operates smoothly, has a reliable locking function, and offers adjustable gears. Utility Model Content

[0003] To address the aforementioned problems, this utility model proposes a flip-top integrated armor grinder to solve the issues of inconvenient battery replacement and cumbersome assembly in the prior art.

[0004] The purpose of this invention is to provide a manual gear shifting mechanism that enables smooth gear shifting, adjustable gears, and reliable gear lock-up function, thereby improving the stability and safety of gear shifting operations.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A manual gear shifting mechanism includes an upper housing and a lower housing, which are fastened together by a sealing gasket and screws. The upper and lower housings house a gear shifting mechanism and a gear locking mechanism. The gear locking mechanism includes a hydraulic cylinder, a spring seat, a piston push rod, a piston rod, and a positioner. The hydraulic cylinder is fixed to the left side of the front section of the upper housing by screws, and the spring seat is fixed to the right side of the front section of the upper housing by screws, containing a first spring. The piston push rod is located inside the hydraulic cylinder, with one end exposed outside the cylinder. The front section of the upper housing has a through hole containing the piston rod. The left side of the piston rod connects to the piston push rod inside the hydraulic cylinder, and the right side of the piston rod connects to the first spring inside the spring seat. The positioner is located below the piston rod.

[0007] Preferably, the shifting mechanism includes a selector lever, a shift shaft, and a shift fork. Another through hole is opened inside the upper housing from front to back, through which the selector lever passes. A cover plate is fixed to the rear end of the through hole of the upper housing by screws. The selector lever is partially exposed at the front end of the upper housing. Threaded holes are opened at the front end and middle of the selector lever. The threaded hole at the front end of the selector lever is used to connect to an external manual control unit. A lever is fixed to the rear end of the selector lever by screws through the threaded holes. By controlling the selector lever, the lever can be rotated or moved back and forth, thereby controlling the shift shaft to shift gears.

[0008] Furthermore, the lower housing has two through holes from front to back, and a shift shaft passes through each of the two through holes. A shift fork is fixed to the shift shaft with screws. A second spring and a spring pressure plate are provided inside the shift fork. The bottom of the shifter extends into the two sets of shift forks. By controlling the selection lever, the shifter can be rotated or moved back and forth, thereby controlling the shift shaft to rotate or move back and forth to perform shifting.

[0009] Furthermore, the two through holes at the front end of the lower housing are connected to form a through hole, and a stop pin and a stop ball are placed in the through hole. The shift shaft has an upper notch and a side notch on the front side. The upper notch cooperates with the positioner, and the side notch is connected to the stop ball.

[0010] Furthermore, the positioner is equipped with a third spring, with the upper end of the positioner matching the piston rod and the bottom matching the upper notch on the shift shaft.

[0011] Furthermore, several sets of abutments are provided on the outer side of the piston rod. The diameter of the abutments is larger than the diameter of the piston rod. By moving the piston rod left and right, the abutments move left and right, thereby locking the up and down movement of the positioner to achieve gear locking or release.

[0012] Preferably, the stop ball engages with the side notch of the shift shaft to lock the other shift shaft after shifting, ensuring gear stability.

[0013] Preferably, the end faces of the upper and lower housings are sealed with gaskets and fastened together with screws to improve the sealing performance and structural stability of the mechanism.

[0014] The beneficial effects of this utility model are as follows:

[0015] 1. Hydraulic power assist for easy operation: The mechanical lock can be released with a small flow of hydraulic oil, which greatly reduces the initial operating force for shifting gears and improves the driver's experience.

[0016] 2. Dual-stage locking for safety and reliability: It adopts a dual locking mechanism of "initial positioning with positioning spring" and "final mechanical pressing with piston rod block", which has a large locking force and excellent shock resistance and anti-derailment performance.

[0017] 3. Adjustable gears, multi-purpose: The number of available gears can be changed by simply adjusting the screw, allowing the same mechanism to flexibly adapt to different gearboxes or working conditions, making it highly versatile.

[0018] 4. Structural interlock to prevent gear shifting: The unique stop ball interlock design fundamentally eliminates the possibility of both shift shafts engaging gears simultaneously, improving the safety of the transmission system.

[0019] 5. Compact structure and good sealing: The integrated shell design and high degree of internal mechanism integration make it suitable for agricultural machinery installation environments with limited space and harsh conditions. Attached Figure Description

[0020] Figure 1 This is an exploded view of the three-dimensional structure of this utility model.

[0021] Figure 2 This is a structural diagram of the shifting mechanism and gear locking mechanism of this utility model.

[0022] Figure 3 This is a bottom view of the gear locking mechanism structure of this utility model.

[0023] Figure 4 This is an assembly drawing of the shift fork structure of this utility model.

[0024] Figure 5 This is an internal schematic diagram of the shift fork structure of this utility model.

[0025] Figure 6 This is a gear shift diagram for this utility model.

[0026] The components are: 1. Upper housing; 2. Lower housing; 3. Hydraulic cylinder; 4. Spring seat; 5. Piston push rod; 6. Piston rod; 7. Positioner; 8. First spring; 9. Selector lever; 10. Shift shaft; 11. Shift fork; 12. Actuator; 13. Second spring; 14. Spring pressure plate; 15. Stop pin; 16. Stop ball; 17. Upper notch; 18. Side notch; 19. Abutment block. Detailed Implementation

[0027] To deepen the understanding of this utility model, the following detailed description will be provided in conjunction with embodiments. These embodiments are only used to explain this utility model and do not constitute a limitation on the scope of protection of this utility model.

[0028] according to Figure 1-6 As shown, the manual shifting mechanism provided in this embodiment has an upper housing 1 and a lower housing 2 made of high-strength cast iron. The mating surfaces of the two are fitted with oil-resistant rubber gaskets and fastened with a ring of internal hexagonal head screws to form a rigid, dustproof and waterproof sealed cavity.

[0029] I. Working process of the gear locking component:

[0030] The hydraulic cylinder 3 is fixed to the mounting base on the front left side of the upper housing 1 by four screws. The oil inlet of the hydraulic cylinder 3 is connected to the hydraulic system of the tractor. The piston push rod 5 inside the hydraulic cylinder 3 is connected to the left end of the piston rod 6 by a thread. The spring seat 4 is fixed to the right side of the upper housing 1. The first spring 8 (reset spring) inside it is always in a compressed state. Its elastic force acts on the right end step of the piston rod 6, attempting to push the piston rod 6 to the left.

[0031] Two protruding cylindrical blocks 19 are provided on the outer side of the middle section of the piston rod 6. The positioner 7 is an inverted "T"-shaped slider, the vertical part of which passes through the guide groove of the lower housing 2. The upper end can contact the lower surface of the block 19, and the lower end is hemispherical, which together with the third spring forms an elastic positioning head.

[0032] Initial (locked) state: The hydraulic system is not supplying oil, and under the thrust of the first spring 8, the piston rod 6 is in the leftmost position. At this time, the stop block 19 is pressed against the upper end face of the positioner 7, pressing it downwards tightly into the upper notch 17 of any shift shaft 10 (usually the notch corresponding to neutral). This downward pressure, together with the third spring inside the positioner, firmly locks the shift shaft 10, preventing it from moving forward or backward.

[0033] Unlocking process: When the driver needs to shift gears, the hydraulic system supplies oil to the cylinder 3. The oil pressure pushes the piston rod 5 and drives the piston rod 6 to move to the right. This movement has two key effects: First, the stop block 19 moves away from the upper end face of the positioner 7, relieving the downward load on it; second, as the piston rod 6 moves to the right, it will slightly lift the positioner 7 upward through a connecting pin (or ramp), causing its lower hemispherical head to disengage from the upper notch 17 of the shift shaft 10. At this point, the axial movement constraint of the shift shaft 10 is completely released.

[0034] Shifting and Relocking Process: The driver then manipulates the selector lever 9 to select and engage the gear. When the shift shaft 10 moves to the target gear, its corresponding upper notch 17 moves precisely below the positioner 7. Under the action of its internal third spring, the positioner 7 automatically falls into the notch, achieving initial gear positioning and holding. Next, the hydraulic system is depressurized, and under the strong restoring force of the first spring 8, the piston rod 6 quickly returns to its original position to the left. During the return process, the abutment 19 presses down on the positioner 7 again, wedging it firmly into the upper notch 17 of the shift shaft 10, forming the final, unshakeable mechanical lock. This process is accompanied by a clear "click," providing the driver with clear feedback that the gear is in position.

[0035] II. Working process of the gear shifting operation and execution components:

[0036] The selector lever 9 passes through the top of the upper housing 1, and the rear end is fixed to the shifter 12 by a screw with holes. Two shift shafts 10 are arranged in parallel in the lower housing 2, and a shift fork 11 is fixed to each shaft by a screw with holes and a locking wire. The shift fork 11 has a slot on its upper part, and the shifter 12 is inserted into the slots of the two shift forks 11.

[0037] Gear selection operation: The driver swings the gear shift lever (connected to the front end of the selector lever 9) to the left or right, causing the selector lever 9 and the shifter 12 to rotate around the axis. The shifter 12 rotates to the left or right, causing one of the shift forks 11 to rotate. At this point, the mechanism enters the state of "preparing to operate the left (or right) shift shaft".

[0038] Gear engagement operation: The driver pushes the gear shift lever forward or backward, causing the selector lever 9 and the shifter 12 to move back and forth along the axis. Since the shifter 12 is engaged with the target shift fork 11, this back and forth movement is directly converted into the axial movement of the shift fork 11 and the shift shaft 10 it is fixed to, thereby driving the synchronizer in the gearbox to complete the engagement or disengagement of the gear.

[0039] III. Working process of the shift shaft interlock assembly:

[0040] The lower housing 2 has a horizontal through-hole cavity machined at the front, inside which a stop ball 16 and stop pins 15 at both ends are placed. Each of the two shift shafts 10 has a side notch 18 on its front side. In the neutral position, the side notches 18 of the two shift shafts 10 are aligned with this through-hole cavity, and the stop ball 16 can be partially inserted into the two notches under the restriction of the stop pins 15 at both ends.

[0041] Interlocking Principle: Suppose we want to engage left gear (by moving the left shift shaft 10 forward). As the left shift shaft 10 begins to move forward, its side notch 18 also moves open. The stop ball 16, unable to move to the right due to the obstruction of the right stop pin 15, is pushed to the right by the shaft of the left shift shaft 10. This rolling causes the ball to be pressed deeper into the side notch 18 of the right shift shaft 10, thus locking the right shift shaft 10 in its current position (neutral), preventing any axial movement. The reverse is also true. This ingenious design ensures that at any given time, only one shift shaft can move to engage gears, achieving a reliable mechanical interlock.

[0042] This simple mechanical limiting method allows the shifting mechanism to be adapted to gearboxes with different numbers of gears without replacing any parts, making it highly practical and economical.

[0043] In summary, this utility model achieves excellent performance with low shifting force, reliable locking, and adjustable functions through the ingenious combination of hydraulics and mechanics, making it particularly suitable for agricultural and engineering machinery fields with high requirements for reliability and adaptability.

[0044] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A manual gear shifting mechanism, comprising an upper housing (1) and a lower housing (2), which are fastened together by a sealing gasket and screws, wherein a gear shifting mechanism and a gear locking mechanism are assembled inside the upper housing (1) and the lower housing (2), characterized in that: The gear locking mechanism includes a hydraulic cylinder (3), a spring seat (4), a piston push rod (5), a piston rod (6), and a positioner (7). The hydraulic cylinder (3) is fixed to the left side of the front section of the upper housing by screws, and the spring seat (4) is fixed to the right side of the front section of the upper housing by screws. A first spring (8) is built inside the spring seat (4). The piston push rod (5) is located inside the hydraulic cylinder (3), and one end of the piston push rod (5) is exposed outside the hydraulic cylinder (3). The front section of the upper housing (1) is provided with a through hole, which contains the piston rod (6). The left side of the piston rod (6) is connected to the piston push rod (5) inside the hydraulic cylinder (3), and the right side of the piston rod (6) is connected to the first spring (8) inside the spring seat (4). The positioner (7) is located below the piston rod (6).

2. The manual gear shifting mechanism according to claim 1, characterized in that: The shifting mechanism includes a selector lever (9), a shift shaft (10), and a shift fork (11). The upper housing (1) has another through hole from front to back, through which the selector lever (9) is inserted. The rear end of the through hole of the upper housing (1) is fixed to the cover plate by screws. The selector lever (9) is partially exposed at the front end of the upper housing (1). The front end and middle of the selector lever (9) have threaded holes. The threaded hole at the front end of the selector lever (9) is used to connect to the external manual control unit. The rear end of the selector lever (9) is fixed to the lever (12) by screws in the threaded hole. By controlling the selector lever (9), the lever (12) is controlled to rotate or move back and forth, thereby controlling the shift shaft (10) to shift gears.

3. A manual gear shifting mechanism according to claim 2, characterized in that: The lower housing (2) has two through holes from front to back, and a shift shaft (10) passes through each of the two through holes. A shift fork (11) is fixed to the shift shaft (10) with screws. A second spring (13) and a spring pressure plate (14) are provided inside the shift fork (11). The bottom of the actuator (12) extends into the two sets of shift forks (11). By controlling the selector lever (9), the actuator (12) can be rotated or moved back and forth, thereby controlling the shift shaft (10) to rotate or move back and forth to perform shifting.

4. A manual gear shifting mechanism according to claim 3, characterized in that: The two through holes at the front end of the lower housing (2) are connected to form a through hole. A stop pin (15) and a stop ball (16) are placed in the through hole. The shift shaft (10) has an upper notch (17) and a side notch (18) on the front side. The upper notch (17) cooperates with the positioner (7), and the side notch (18) is connected to the stop ball (16).

5. A manual gear shifting mechanism according to claim 4, characterized in that: The positioner (7) is provided with a third spring. The upper end of the positioner (7) matches the piston rod (6), and the bottom matches the upper notch (17) on the shift shaft (10).

6. A manual gear shifting mechanism according to claim 5, characterized in that: Several sets of abutments (19) are provided on the outside of the piston rod (6). The diameter of the abutments (19) is larger than the diameter of the piston rod (6). By moving the piston rod (6) left and right, the abutments (19) move left and right, thereby locking the up and down movement of the positioner (7) to achieve gear locking or release.

7. The manual shifting mechanism according to claim 4, characterized in that, The stop ball (16) cooperates with the side notch (18) of the shift shaft (10) to lock the other shift shaft after shifting gears, ensuring gear stability.

8. The manual shifting mechanism according to claim 1, characterized in that, Sealing gaskets are used on the end faces of the upper housing (1) and the lower housing (2).

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