High-speed reverse gear prevention device

Abstract

The utility model discloses a high-speed reverse gear preventing device, which relates to the technical field of gear shifting mechanisms, is mounted on a frame, is positioned at a main speed change gear shifting lever and a high-low speed gear shifting lever, and comprises an anti-falling frame movably mounted on the frame, and an anti-falling driving part and an anti-falling limiting part are arranged on the anti-falling frame. The anti-falling driving part is used for driving the anti-falling frame to move in the direction of the main speed changing gear shifting rod in the process that the high-low speed gear shifting rod is engaged to a high-speed gear, and the anti-falling limiting part is used for being blocked on a reverse gear engaging path of the main speed changing gear shifting rod after the anti-falling frame moves in the direction of the main speed changing gear shifting rod; and the anti-falling frame is connected with a return driving mechanism. Under the condition that the high-low speed gear shifting rod is shifted to the high-speed gear, the anti-falling limiting part is blocked on the reverse gear shifting path of the main speed changing gear shifting rod, so that the main speed changing gear shifting rod cannot be shifted to the reverse gear, the reverse operation can be effectively avoided when the high-low speed gearbox is in the high-speed gear, and the reliable operation of parts is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to gear shifting mechanism technical field especially, relates to a high speed reverse gear preventing device. BACKGROUND

[0002] In the agricultural and forestry machinery operation, a traction chassis or a self-propelled chassis is used to drive walking, and its power system includes an engine, a gearbox, a transmission mechanism, a gear shifting mechanism and the like. The gearbox is used to change the gear position (i.e. the transmission ratio), so as to achieve the economy and efficiency of power output when the required speed is reached, and to switch the gear position for forward and reverse movement under the scene requirement. In actual application, the above chassis not only needs to be used to drive walking during the operation process, but also needs to be used to drive during the scene change and the return trip. Therefore, the above chassis needs to meet the requirement of a large wide speed interval during the operation process at low speed and during the scene change or the return trip at high speed. Therefore, a high-low speed gearbox is connected in series in the chassis for use. More specifically, the high-low speed gearbox is switched to the low speed gear position during the operation, and the gear position is switched by the main gearbox to meet the requirement of low speed driving during the operation process. During the scene change or the return trip, the high-low speed gearbox is switched to the high speed gear position to meet the requirement of high speed driving. When the reverse movement is required, the high-low speed gearbox is switched to the low speed gear position, and the main gearbox is switched to the reverse gear, so that the reverse movement operation can be performed. However, in actual use, the high-low speed gearbox is often forgotten to be in the high speed gear position, and the reverse movement is directly performed by the main gearbox. The transmission ratio of the high speed gear position of the high-low speed gearbox is large, which can cause the overload of the engine power end torque, resulting in the engine flameout, and can even cause the damage of the parts. Therefore, a measure is needed to prevent the reverse movement operation when the high-low speed gearbox is in the high speed gear position, so as to solve the above problems. SUMMARY

[0003] The utility model provides a high speed reverse gear preventing device, effectively avoids the reverse movement operation when the high-low speed gearbox is in the high speed gear position, and is beneficial to ensuring the reliable operation of the parts.

[0004] To solve the above technical problems, the technical scheme of the utility model is as follows: a high speed reverse gear preventing device is installed on a rack and located at a main gear shifting lever and a high-low speed gear shifting lever, and includes a reverse movement preventing frame movably installed on the rack. The reverse movement preventing frame is provided with a reverse movement preventing driving part and a reverse movement preventing limiting part. The reverse movement preventing driving part is used to drive the reverse movement preventing frame to move towards the main gear shifting lever during the process that the high-low speed gear shifting lever is hung to the high speed gear position. The reverse movement preventing limiting part is used to block the reverse gear hanging path of the main gear shifting lever after the reverse movement preventing frame moves towards the main gear shifting lever. The reverse movement preventing frame is connected with a return driving mechanism.

[0005] The anti-reverse driving part comprises an anti-reverse driving smooth edge arranged on the anti-reverse frame.

[0006] The anti-reverse limiting part comprises an anti-reverse stop arranged fixedly on the anti-reverse frame.

[0007] The return driving mechanism comprises a return driving smooth edge arranged on the anti-reverse frame.

[0008] The anti-reverse frame is swing-installed on the machine frame, and the swing shaft of the anti-reverse frame is located between the gear shifting path of the main gear shifting lever and the gear shifting path of the high-low speed gear shifting lever. The groove edge of the linkage slot close to the main gear shifting lever constitutes the anti-reverse driving part, and the groove edge of the linkage slot away from the main gear shifting lever constitutes the return driving mechanism. The anti-reverse limiting part is located on the side of the reverse gear shifting path of the main gear shifting lever.

[0009] The swing shaft is a swing bolt fixedly installed on the machine frame, and the anti-reverse frame is provided with a swing connecting ear part sleeved on the swing bolt.

[0010] The swing bolt is provided with an axial limiting structure on both sides of the swing connecting ear part.

[0011] The high-speed reverse prevention device is installed on the machine frame and located at the main gear shifting lever and the high-low speed gear shifting lever, and comprises an anti-reverse frame swing-installed on the machine frame. The anti-reverse limiting part is used for stopping the anti-reverse frame on the reverse gear shifting path of the main gear shifting lever after the anti-reverse frame moves towards the main gear shifting lever. The anti-reverse frame is connected with a return driving mechanism. In the case that the high-low speed gear shifting lever is shifted to the high-speed gear position, the anti-reverse limiting part stops on the reverse gear shifting path of the main gear shifting lever, so that the main gear shifting lever cannot be shifted to the reverse gear. BRIEF DESCRIPTION OF DRAWINGS

[0012] The following drawings are only intended to illustrate and explain the present application, and do not limit the scope of the present application.

[0013] Figure 1 This is a three-dimensional structural diagram of the hidden cover plate according to an embodiment of the present utility model;

[0014] Figure 2 yes Figure 1 A schematic diagram of the structure behind the cover plate is shown;

[0015] Figure 3 yes Figure 1 A diagram showing the reverse gear engagement state of the main transmission shift lever after the high / low speed shift lever has been switched to the high speed position.

[0016] Figure 4 yes Figure 3 A schematic diagram of the structure behind the cover plate is shown.

[0017] In the diagram: 1-Frame; 11-U-shaped side plate; 12-Cover plate; 13-Gear guide hole; 2-Main transmission shift lever; 3-High and low speed shift lever; 4-Anti-tipping frame; 41-Anti-tipping drive part; 42-Anti-tipping limit part; 43-Swing bolt; 44-Swing connecting ear; 45-Linkage slot; 5-Return drive mechanism. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the following detailed description, only certain exemplary embodiments of the present invention are described by way of illustration. Undoubtedly, those skilled in the art will recognize that various modifications can be made to the described embodiments without departing from the spirit and scope of the present invention. Therefore, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.

[0019] like Figures 1 to 4 As shown, the high-speed reverse gear prevention device is installed on the frame 1 and located at the main gear shift lever 2 and the high / low speed shift lever 3. The frame 1 can be a separate frame for this device or a frame 1 shared with the power chassis; no limitation is made here. This embodiment only illustrates the box structure at the main gear shift lever 2 and the high / low speed shift lever 3 in the frame 1. The box structure includes a U-shaped side plate 11, and a cover plate 12 is provided on the U-shaped side plate 11. The cover plate 12 is provided with gear guide holes 13 corresponding to the main gear shift lever 2 and the high / low speed shift lever 3, respectively.

[0020] The main gear shift lever 2 is the operating structure for switching gears in the main gearbox. It is mainly used for switching between various gears, such as forward gears and reverse gears. In this embodiment, to solve the problem of preventing high-speed reverse gearing, it should at least have the function of switching to reverse gear. However, the number and type of other switchable gears are not limited here. The high-low speed shift lever 3 is the operating structure for operating the high-low speed gearbox. It should at least have the function of switching between one low-speed gear and one high-speed gear. Whether it can switch to other speed gears is not limited here.

[0021] This device includes an anti-reverse frame 4 movably mounted on the frame 1. The anti-reverse frame 4 is provided with an anti-reverse driving part 41 and an anti-reverse limiting part 42. The anti-reverse driving part 41 is used to drive the anti-reverse frame 4 towards the main gear shift lever 2 during the process of the high and low speed shift lever 3 being engaged with the high speed gear. The anti-reverse limiting part 42 is used to block the anti-reverse frame 4 in the reverse gear engagement path of the main gear shift lever 2 after the anti-reverse frame 4 moves towards the main gear shift lever 2.

[0022] More specifically, such as Figure 1 and Figure 2 As shown, when the high / low speed shift lever 3 is not engaged in the high-speed gear, the anti-reverse bracket 4 is in its original position, away from the main gear shift lever 2. Figure 3 and Figure 4 As shown, when the high-low speed shift lever 3 is engaged in the high-speed gear, the high-low speed shift lever 3 will drive the anti-reverse bracket 4 to move toward the main gear shift lever 2 through the anti-reverse drive part 41. Finally, the anti-reverse restriction part 42 will hold the main gear shift lever 2 in the reverse gear engagement path. In this embodiment, the position of the anti-reverse bracket 4 at this time is called the holding position.

[0023] By engaging the anti-reverse frame 4 to the high-speed gear position, the anti-reverse limiting part 42 is engaged in the reverse gear engagement path of the main transmission shift lever 2, preventing the main transmission shift lever 2 from engaging reverse gear at this time. This effectively avoids reversing operations when the high and low speed transmissions are in high gear, thus ensuring the reliable operation of the components.

[0024] The anti-reverse drive unit 41 described in this embodiment includes an anti-reverse drive smooth edge disposed on the anti-reverse frame 4. That is, the high / low speed shift lever 3 drives the anti-reverse frame 4 to swing by abutting against the anti-reverse drive smooth edge. Of course, during high-speed gear shifting, the contact point between the high / low speed shift lever 3 and the anti-reverse drive smooth edge changes, and the smoothness of the anti-reverse drive smooth edge prevents jamming during this process. Therefore, the anti-reverse drive smooth edge only needs to maintain a smooth shape within the abutment range of the high / low speed shift lever 3 when shifting to high-speed gear, such as a straight line or an arc.

[0025] The anti-reverse limiting part 42 includes an anti-reverse baffle fixedly mounted on the anti-reverse frame 4, which rigidly blocks and achieves the purpose of preventing high-speed reverse gear.

[0026] The anti-reverse frame 4 is connected to a return drive mechanism 5, so that after the high-low speed shift lever 3 is disengaged from the high-speed gear, the anti-reverse frame 4 can return to its original position. At this time, the reverse gear holding function of the main transmission shift lever 2 is released, thus facilitating the main transmission shift lever 2 to engage reverse gear when the high-low speed shift lever 3 is switched to the low-speed gear, so that the equipment can reverse under reasonable torque load and drive speed.

[0027] The return drive mechanism 5 described in this embodiment includes a return drive smooth edge disposed on the anti-reverse frame 4. This return drive is similar in principle to the anti-reverse drive when shifting gears at high speed, both of which are driven back by the abutment of the high and low speed shift lever 3.

[0028] More specifically, in this embodiment, the main gear shift lever 2 is used for reverse gear engagement, and the high / low speed shift lever 3 is used for high speed gear engagement. The anti-reverse frame 4 is oscillatingly mounted on the frame 1, and the oscillation axis of the anti-reverse frame 4 is located between the engagement path of the main gear shift lever 2 and the engagement path of the high / low speed shift lever 3. Of course, the engagement path here does not only refer to the reverse gear engagement path or the high speed gear engagement path. The anti-reverse frame 4 has a linkage slot 45 located at the high and low speed shift lever 3. The high and low speed shift lever 3 passes through the linkage slot 45. The groove edge of the linkage slot 45 near the main gear shift lever 2 constitutes the anti-reverse driving part 41, that is, the anti-reverse driving smooth edge. The groove edge of the linkage slot 45 away from the main gear shift lever 2 constitutes the return driving mechanism 5, that is, the return driving smooth edge. The anti-reverse limiting part 42 is located on the side of the reverse gear engagement path of the main gear shift lever 2.

[0029] The swing shaft is a swing bolt 43 fixedly mounted on the frame 1, and the anti-tipping frame 4 is provided with a swing connecting lug 44 sleeved on the swing bolt 43. The swing mounting of the anti-tipping frame 4 is achieved by the sleeve of the swing connecting lug 44 and the swing bolt 43. The swing bolt 43 is provided with axial limiting structures on both sides of the swing connecting lug 44 to ensure stable swing; the axial limiting structures can be implemented using nuts or the like, and are not limited here.

[0030] In the frame 1 structure shown in this embodiment, the swing bolt 43 is fixedly installed on the cover plate 12, and the anti-tipping frame 4 is installed inside the cover plate 12. To reduce size and ensure smooth swinging action, the main body of the anti-tipping frame 4 in this embodiment adopts a plate structure, so it can swing in a direction approximately parallel to the cover plate 12. Thus, the anti-tipping frame 4 roughly forms an F-shape, realizing a linkage operation to prevent high-speed reverse gear through a simple plate part. The structure is compact, easy to assemble, and smooth to operate.

[0031] In addition to the aforementioned structure, the return drive mechanism 5 may also be implemented without using the return drive smooth edge, but instead using a return spring or similar device installed between the anti-tipping frame 4 and the frame 1. This method should also be within the scope of the return drive mechanism 5. Of course, the anti-tipping drive part 41 may also be implemented using a hinged link or similar device between the high / low speed shift lever 3 and the anti-tipping frame 4. When using this hinged link, the hinged link can also serve as the return drive mechanism 5, and this method should also be within the protection scope of this utility model.

[0032] 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 without departing from the spirit and scope of this utility model. For example, the anti-reverse frame 4 can also be installed in a sliding manner, with its sliding direction intersecting the reverse gear engagement path of the main transmission shift lever 2. Through the inclined surface pressing of the high / low speed shift lever 3 or the hinged connecting rod, when the high / low speed shift lever 3 is engaged in a high-speed gear, the anti-reverse frame 4 can slide, and after sliding, the anti-reverse limiting part 42 holds the main transmission shift lever 2 in the reverse gear engagement path. These changes and modifications all fall within the scope of this utility model as claimed. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A high-speed reverse gear prevention device, mounted on the frame and located at the main transmission shift lever and the high / low speed shift lever, characterized in that: The device includes an anti-reverse frame movably mounted on the frame. The anti-reverse frame is provided with an anti-reverse driving part and an anti-reverse limiting part. The anti-reverse driving part is used to drive the anti-reverse frame to move towards the main gear shift lever when the high-low speed shift lever is engaged in a high-speed gear. The anti-reverse limiting part is used to block the anti-reverse frame in the reverse gear engagement path of the main gear shift lever after it moves towards the main gear shift lever. The anti-reverse frame is connected to a return drive mechanism.

2. The high-speed reverse gear prevention device as described in claim 1, characterized in that: The anti-tipping mechanism includes an anti-tipping smooth edge disposed on the anti-tipping frame.

3. The high-speed reverse gear prevention device as described in claim 1, characterized in that: The anti-tipping limiting part includes an anti-tipping baffle fixedly installed on the anti-tipping frame.

4. The high-speed reverse gear prevention device as described in claim 1, characterized in that: The return drive mechanism includes a return drive smooth edge disposed on the anti-tipping frame.

5. The high-speed reverse gear prevention device according to any one of claims 1 to 4, characterized in that: The main gear shift lever is used for reverse gear engagement, and the high / low speed shift lever is used for high speed gear engagement. An anti-reverse frame is oscillatingly mounted on the frame, with its oscillation axis located between the engagement paths of the main gear shift lever and the high / low speed shift lever. The anti-reverse frame has a linkage slot located at the high / low speed shift lever, through which the high / low speed shift lever passes. The slot edge of the linkage slot near the main gear shift lever constitutes the anti-reverse driving part, and the slot edge away from the main gear shift lever constitutes the return drive mechanism. The anti-reverse limiting part is located to the side of the reverse gear engagement path of the main gear shift lever.

6. The high-speed reverse gear prevention device as described in claim 5, characterized in that: The swing shaft is a swing bolt fixedly installed on the frame, and the anti-tipping frame is provided with a swing connecting lug sleeved on the swing bolt.

7. The high-speed reverse gear prevention device as described in claim 6, characterized in that: The swing bolt is provided with axial limiting structures on both sides of the swing connecting lug.

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