Gear locking mechanism of gearbox

Abstract

The utility model discloses a gear locking mechanism of a gearbox, and belongs to the technical field of gearboxes. Comprising a control shell, a transverse gear shifting rod is arranged in the control shell, and a gear shifting shifting block is arranged on the transverse gear shifting rod in a sleeving mode; a gear selecting guide block unit is arranged at the working end of the gear shifting block; the gear selecting guide block unit comprises a plurality of gear guide blocks; a high-gear lock plunger is arranged in the highest-gear gear guide block in the gear guide blocks and used for limiting the gear shifting block to select the highest-gear gear guide block. The axial direction of the high-gear lock plunger is parallel to the axial direction of the transverse gear shifting rod. The gear locking mechanism is a pure mechanical gear locking mechanism, is simple and reliable in structure and low in failure rate, and can reduce the cost of a gearbox compared with an original gear locking structure; and air path control gear locking is not needed, whole vehicle air path arrangement of a main engine plant can be reduced, and whole vehicle assembly complexity and operation complexity are reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of gearboxes and relates to a gearbox locking mechanism. Background Art

[0002] Under special working conditions, when using a mechanical transmission, it is required to lock the highest gear (such as 8th gear) to limit the vehicle speed. The current gearbox lock mechanism adopts a scheme of adding a lock cylinder to the operating mechanism, and extending the piston rod out of the cylinder through the air circuit to lock the gear selector on the shift lever. Figure 1 For example, the invention patent "A transmission lock mechanism" with application number 201510344998.1 solves the problem of locking the high reverse gear and high climbing gear. The previous lock mechanism adopts a lock cylinder added to the upper cover, which is achieved by extending the piston rod out of the cylinder to block the fork shaft in the high gear range. This lock structure needs to change the structure of the upper cover and the fork shaft, resulting in many deformed parts, increasing the manufacturing and inventory costs, and when the transmission is in overdrive and a reversing mechanism needs to be added, the lock cylinder is difficult to arrange. The proposed technical solution includes a transmission operating housing with a transverse shift rod, a lock cylinder is arranged on the side of the transmission operating housing, and a lock cylinder piston is arranged in the lock cylinder to limit the transverse shift rod. The piston jacket of the lock cylinder is provided with a return spring.

[0003] This type of locking mechanism still requires the addition of a locking cylinder to the operating mechanism, and requires an air pipe to be connected from the entire vehicle for ventilation. For gearbox manufacturing, the gear selector head structure needs to be changed, new deformed parts need to be produced, and the operating mechanism needs to add a cylinder assembly, which will increase the gearbox cost and parts inventory cost. For OEMs and users, the vehicle air circuit needs to be rearranged, which increases assembly difficulty and operation complexity. Utility Model Content

[0004] The utility model aims to solve the technical problems in the prior art that when locking the gear, the gear selection dial structure needs to be changed, new deformed parts are produced, and the operating mechanism needs to increase the cylinder assembly, and provides a gearbox locking mechanism.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] In the first aspect, the utility model provides a gearbox locking mechanism, including an operating shell, a transverse shift rod is arranged in the operating shell, and the transverse shift rod sleeve is provided with a shift dial head; the working end of the shift dial head is a gear selection guide block unit, and the gear selection guide block unit includes a plurality of gear guide blocks; a high-speed lock plunger is arranged in the highest-speed gear guide block among the plurality of gear guide blocks, which is used to limit the shift dial head from selecting the highest-speed gear guide block; the axial direction of the high-speed lock plunger is parallel to the axial direction of the transverse shift rod.

[0007] The utility model is further improved in that:

[0008] A return spring is arranged between the high-speed lock plunger and the highest-speed gear guide block; when the shifting head moves to the gear guide block adjacent to the highest-speed gear guide block, the return spring is compressed to the maximum compression amount.

[0009] The high-speed lock plunger and the highest-speed gear guide block are clearance-matched; the return spring and the highest-speed gear guide block are clearance-matched.

[0010] A high-speed lock screw plug is arranged on the highest-speed gear guide block at the rear end of the return spring.

[0011] The high-grade lock plunger is in the shape of a cylinder with a raised step on the wall surface; the raised step is used to snap into the highest-grade gear guide block to prevent the high-grade lock plunger from falling off.

[0012] The contact surface between the high-speed lock plunger and the shifting head is in an arc shape.

[0013] The gear selection guide block unit comprises a fourth-fifth gear guide block, a sixth-seventh gear guide block and an eighth-gear guide block which are arranged in sequence; the eighth-gear guide block is a highest-gear gear guide block.

[0014] The high-grade lock plunger is made of metal.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] The utility model discloses a gearbox lock mechanism, which adds a high-end lock plunger to the existing highest-gear gear guide block, and one end of the high-end lock plunger extends out of the highest-gear gear guide block to limit the shift head from selecting the highest-gear operation. The utility model is a purely mechanical gear lock mechanism, which has a simple and reliable structure and a low failure rate, and can reduce the gearbox cost compared with the original gear lock structure; and there is no need for air circuit control to lock the gear, which can reduce the air circuit layout of the whole vehicle of the main engine factory, and reduce the complexity of assembly and operation of the whole vehicle.

[0017] Furthermore, one end of the high-speed lock plunger is connected to a return spring, and the other end extends out of an eight-speed guide block to limit the eight-speed gear selection. When operating the gear selection, when the gear selection dial selects the sixth or seventh gear guide block, the return spring is compressed to the maximum compression amount, and the high-speed lock plunger restricts the gear selection dial from selecting the eighth gear position, thereby successfully locking the eighth gear. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of a gear lock mechanism of a gearbox in the prior art;

[0020] Figure 2 This is a schematic diagram of the 2 / 3 gear position of a gearbox lock mechanism in the utility model;

[0021] Figure 3 The utility model is a schematic diagram of a gearbox locking mechanism for realizing 8-gear locking structure.

[0022] Among them: 101-locking cylinder; 102-cylinder head; 103-cylinder piston; 104-cylinder return spring; 105-existing operating housing; 106-existing lateral shift lever; 107-existing shift dial head; 108-existing gear selection dial head; 1-lateral shift lever; 2-shift dial head; 3-fourth and fifth gear guide blocks; 4-sixth and seventh gear guide blocks; 5-eighth gear guide block; 6-eighth gear lock plunger; 7-return spring; 8-eighth gear lock screw plug; 9-operating housing; 10-transmission upper cover; 11-transmission housing. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0026] In the description of the embodiments of the present utility model, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use, it is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0027] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0028] In the description of the embodiments of the present utility model, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0029] The utility model is further described in detail below with reference to the accompanying drawings:

[0030] See also Figure 2The utility model discloses a gearbox lock mechanism, which is characterized by comprising an operating housing 9, a transverse shift rod 1 is arranged in the operating housing 9, and the transverse shift rod 1 is sleeved with a shift head 2; the working end of the shift head 2 is a gear selection guide block unit, and the gear selection guide block unit includes a fourth and fifth gear guide block 3, a sixth and seventh gear guide block 4 and an eighth gear guide block 5 arranged in sequence; the eighth gear guide block 5 is a highest gear position guide block; an eighth gear lock plunger 6 is arranged in the eighth gear guide block 5, which is used to limit the shift head 2 from selecting the eighth gear guide block 5; the axial direction of the eighth gear lock plunger 6 is parallel to the axial direction of the transverse shift rod 1. A return spring 7 is arranged between the eighth gear lock plunger 6 and the eighth gear guide block 5; an eighth gear lock screw plug 8 is arranged on the eighth gear guide block 5 at the rear end position of the return spring 7. The shape of the eight-speed lock plunger 6 is a cylinder with a raised step on the wall; the raised step is used to be clamped in the eight-speed gear guide block 5 to prevent the eight-speed lock plunger 6 from falling off, and at the same time, the part of the eight-speed lock plunger 6 located on one side of the raised step is clamped in the return spring 7 to fix the return spring 7. The contact surface between the eight-speed lock plunger 6 and the shifting head 2 is arc-shaped. The high-speed lock plunger is made of metal.

[0031] See also Figure 3 When the shift knob 2 moves to the adjacent gear guide block of the highest gear guide block, the return spring 7 is compressed to the maximum compression amount, and the high-speed lock plunger restricts the shift knob from selecting the eighth gear position.

[0032] The utility model discloses a gearbox lock mechanism, which adds a high-end lock plunger to the existing highest-gear gear guide block, one end of the high-end lock plunger extends out of the highest-gear gear guide block to limit the gear shift head from selecting the highest gear operation, one end of the high-end lock plunger is connected to a return spring, and the other end extends out of an eighth-gear guide block to limit the eighth-gear selection. When operating the gear selection, when the gear selection head selects the sixth or seventh-gear guide block, the return spring is compressed to the maximum compression amount, and the high-end lock plunger limits the gear selection head from selecting the eighth-gear position, thereby successfully locking the eighth gear. The utility model is a purely mechanical gear lock mechanism, which has a simple and reliable structure, a low failure rate, and can reduce the gearbox cost compared to the original gear lock structure; and there is no need for air circuit control to lock the gear, which can reduce the air circuit layout of the whole vehicle of the main engine factory, and reduce the assembly complexity and operation complexity of the whole vehicle.

[0033] The working process of the utility model is as follows:

[0034] Existing locking mechanism such as Figure 1As shown, when the gear lock cylinder 101 is ventilated, the cylinder piston 103 will push out the gear lock cylinder 101, and when the user selects a gear, the gear selector head 108 will move the gear shifter head 107, and when it moves to the 6 / 7 gear position, it will contact the pushed-out cylinder piston 103, thereby limiting the gear selector head 108 from continuing to move to the 8th gear position, thereby limiting the user from selecting the 8th gear, thereby achieving the gear lock effect. This structure requires that the gear lock cylinder 101 be ventilated all the time, which is more troublesome.

[0035] The utility model designs a gearbox locking mechanism, which does not need to add a locking cylinder to the operation. Figure 2 As shown, the gearbox is in the second or third gear. When the user continues to select the fourth or fifth gear, the horizontal shift lever 1 drives the shift head 2 to move horizontally to select the gear. The shift head 2 moves to the fourth or fifth gear guide block 3. The shift head 2 contacts the eighth gear lock plunger 6. At this time, the eighth gear lock plunger 6 is not squeezed. When the user continues to select the sixth or seventh gear, as shown in FIG. Figure 3 As shown, the transverse shift lever 1 continues to drive the shift head 2 to move transversely to select gears, and the shift head 2 moves to the sixth and seventh gear guide block 4 positions. At this time, the eighth gear lock plunger 6 is squeezed and extends toward the eighth gear guide block 5, squeezing the return spring 7 inside the eighth gear guide block 5. At this time, the return spring 7 is squeezed to the maximum compression amount, and the eighth gear lock plunger 6 stops extending and retracting, thereby restricting the shift head 2 from continuing to move. At this time, the user can be prevented from continuing to select the eighth gear, thereby achieving the purpose of locking the eighth gear.

[0036] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A gearbox locking mechanism, characterized in that: The invention comprises an operating housing (9), wherein a transverse shift lever (1) is arranged in the operating housing (9), and the transverse shift lever (1) is sleeved with a shift dial head (2); the working end of the shift dial head (2) is a gear selection guide block unit, and the gear selection guide block unit comprises a plurality of gear guide blocks; a high-speed lock plunger is arranged in the highest-speed gear guide block among the plurality of gear guide blocks, and is used to limit the shift dial head (2) from selecting the highest-speed gear guide block; the axial direction of the high-speed lock plunger is parallel to the axial direction of the transverse shift lever (1).

2. The gearbox locking mechanism according to claim 1, characterized in that: A return spring (7) is arranged between the high-speed lock plunger and the highest-speed gear guide block; when the shifting head (2) moves to the gear guide block adjacent to the highest-speed gear guide block, the return spring (7) is compressed to a maximum compression amount.

3. The gearbox locking mechanism according to claim 2, characterized in that: The high-speed lock plunger and the highest-speed gear guide block are clearance-matched; the return spring (7) and the highest-speed gear guide block are clearance-matched.

4. The gearbox locking mechanism according to claim 2, characterized in that: A high-speed locking screw plug is arranged on the highest-speed gear guide block at the rear end of the return spring (7).

5. The gearbox locking mechanism according to claim 1, characterized in that: The high-grade lock plunger is in the shape of a cylinder with a raised step on the wall surface; the raised step is used to snap into the highest-grade gear guide block to prevent the high-grade lock plunger from falling off.

6. The gearbox locking mechanism according to claim 1, characterized in that: The contact surface between the high-speed lock plunger and the gear shifting head (2) is in an arc shape.

7. The gearbox locking mechanism according to claim 1, characterized in that: The gear selection guide block unit comprises a fourth and fifth gear guide block (3), a sixth and seventh gear guide block (4) and an eighth gear guide block (5) which are arranged in sequence; the eighth gear guide block (5) is a highest gear position guide block.

8. The gearbox locking mechanism according to claim 1, characterized in that: The high-grade lock plunger is made of metal.

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