Gearbox neutral gear switch starting device

Abstract

The utility model discloses a gearbox neutral position switch starting device which comprises an upper cover, a first transverse hole and a plurality of blind holes parallel to the first transverse hole are formed in the upper cover, and the rear ends of the blind holes are closed. A shifting fork shaft hole is further formed in the upper cover and is perpendicular to the first transverse hole, a lifting pin is arranged at the bottom of the shifting fork shaft hole, and the upper end of the lifting pin is connected with a shifting fork shaft arranged at the lowermost portion in the shifting fork shaft hole. A neutral gear switch is arranged in the first transverse hole in a penetrating mode, a switch starting pin is arranged at the front end of the neutral gear switch, and the front end of the switch starting pin abuts against the lifting pin. An axial installation hole is formed in the lifting pin, a spring penetrates through the installation hole, and the bottom end of the spring is arranged on a screw plug fixed to the bottom of the shifting fork shaft hole in a sleeved mode. A trigger structure formed by the lifting pin and the switch starting pin can simultaneously realize neutral gear switch starting and gear shifting interlocking functions, the neutral gear switch only bears axial force and does not bear radial force, the working environment of the neutral gear switch is optimized, and wear failure of the neutral gear switch is effectively avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of transmission shifting, and in particular relates to a transmission neutral switch starting device. Background Art

[0002] At present, the neutral switch of commercial vehicle transmissions is mostly arranged on the transmission operating housing. When shifting gears, the shift shaft rotates in the circumferential direction, and the V-groove structure on the shift shaft triggers the neutral switch to be turned on and off, and outputs a neutral signal. In this neutral switch triggering method, the top rod of the neutral switch contacts the V-groove on the shift shaft. When working, the shift shaft will generate axial and lateral forces on the top rod of the neutral switch. Over time, it will cause abnormal wear of the copper shell that wraps the top rod of the neutral switch, which will lead to switch failure and ultimately affect the reliability of the entire vehicle. Utility Model Content

[0003] In view of the existing technical problems at this stage, the purpose of the utility model is to provide a transmission neutral switch starting device to solve the technical problem in the prior art that the neutral switch is easily ineffective due to wear of the push rod.

[0004] In order to achieve the above object, the utility model discloses the following technical solutions:

[0005] A transmission neutral switch starting device comprises an upper cover, wherein a first transverse hole with an open rear end is formed in the upper cover, and a plurality of blind holes which are parallel to the first transverse hole and closed at the rear end; a shift fork shaft hole is also formed in the upper cover, wherein the shift fork shaft hole is perpendicularly arranged to the first transverse hole, and the shift fork shaft hole is connected to the front end of the first transverse hole and the front end of each blind hole;

[0006] The first fork shaft, the second fork shaft, the third fork shaft and the fourth fork shaft are sequentially arranged in the fork shaft hole from top to bottom; the second fork shaft, the third fork shaft and the fourth fork shaft are all provided with positioning grooves along the axial direction of the fork shaft hole, and interlocking pins are arranged in the positioning grooves; interlocking steel balls are arranged between two adjacent fork shafts, and the interlocking steel balls can drive the interlocking pins to move in the same direction;

[0007] A top pin is also provided at the bottom of the shift fork shaft hole, and the upper end of the top pin is connected to the lower end of the fourth shift fork shaft;

[0008] A neutral switch is passed through the first transverse hole, a switch start pin is provided at the front end of the neutral switch, and the front end of the switch start pin abuts against the push pin; an axial mounting hole is provided on the push pin, a spring is passed through the mounting hole, and the bottom end of the spring is sleeved on a screw plug fixed at the bottom of the fork shaft hole.

[0009] Furthermore, the first transverse hole includes a first through hole, a second through hole and a third through hole that are integrally connected from back to front, the inner diameter of the first through hole is larger than the inner diameter of the second through hole, the inner diameter of the second through hole is larger than the inner diameter of the third through hole, a neutral switch limit step is formed at the connection between the first through hole and the second through hole, and a switch start pin limit step is formed at the connection between the second through hole and the third through hole.

[0010] The utility model also has the following technical features:

[0011] Preferably, the interlocking steel balls include a first interlocking steel ball, a second interlocking steel ball and a third interlocking steel ball.

[0012] Furthermore, the mounting hole includes a conical hole and a cylindrical hole connected from top to bottom, the large diameter end of the conical hole is connected to the cylindrical hole, the spring is inserted into the cylindrical hole, and the lower end passes through the cylindrical hole.

[0013] Furthermore, the switch start pin includes a body and a cone head which are integrally connected from back to front, and a first inclined surface is arranged on the cone head.

[0014] Furthermore, the lower end of the ejector pin is provided with a second inclined surface capable of abutting against the first inclined surface.

[0015] Furthermore, the blind hole includes a first blind hole, a second blind hole, a third blind hole and a fourth blind hole, the first fork shaft is located in front of the first blind hole, the second fork shaft is located in front of the second blind hole, the third fork shaft is located in front of the third blind hole, and the fourth fork shaft is located in front of the fourth blind hole.

[0016] Furthermore, the first transverse hole includes a first through hole, a second through hole and a third through hole that are integrally connected from back to front, the inner diameter of the first through hole is larger than the inner diameter of the second through hole, the inner diameter of the second through hole is larger than the inner diameter of the third through hole, a neutral switch limit step is formed at the connection between the first through hole and the second through hole, and a switch start pin limit step is formed at the connection between the second through hole and the third through hole.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The utility model can realize the neutral switch starting and gear shift interlocking functions simultaneously by means of the trigger structure composed of the ejector pin and the switch starting pin, especially through the cooperation between the first inclined surface and the second inclined surface, and the ejector ball head and the trigger mechanism of the neutral switch are non-contact designs. The neutral switch only bears axial force but not radial force, which optimizes the working environment of the neutral switch and avoids the wear and failure of the neutral switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide further understanding of the present disclosure and constitute a part of the specification. They are used to explain the present disclosure together with the following detailed description, but do not constitute a limitation of the present disclosure.

[0020] Figure 1 It is a cross-sectional view of the utility model;

[0021] Figure 2 This is a state diagram of the unlocking of the utility model;

[0022] Figure 3 It is the cross-sectional view of the ejector pin;

[0023] Figure 4 Cutaway view of the switch start pin.

[0024] Numbers in the figure:

[0025] 1-upper cover, 2-first fork shaft, 3-second fork shaft, 4-third fork shaft, 5-fourth fork shaft, 6-interlocking pin, 7-interlocking steel ball, 8-lift pin, 9-neutral switch, 10-switch start pin, 11-spring, 12-screw plug; 71-first interlocking steel ball, 72-second interlocking steel ball, 73-third interlocking steel ball; 81-mounting hole; 91-elevator ball head; 101-first transverse hole, 102-fork shaft hole, 103-first blind hole, 104-second blind hole, 105-third blind hole, 106-fourth blind hole; 811-conical hole, 812-cylindrical hole; 1001-body, 1002-conical head.

[0026] The following specific implementation manner describes this solution in detail. DETAILED DESCRIPTION

[0027] It should be noted that when describing the orientation of the present invention, the orientation or positional relationship indicated by the terms "upper end", "lower end", etc. is only for the convenience of describing the present invention 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. If the specific posture changes, the directional indication will also change accordingly. In the present invention, unless otherwise clearly stipulated and limited, the terms "connected", "fixed", etc. should be understood in a broad sense. For example, "fixed" can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0028] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0029] Unless otherwise specified, the components in the present invention can be purchased from the market.

[0030] Example 1

[0031] Following the above technical solution, Figure 1 to Figure 2 As shown, the present embodiment discloses a transmission neutral switch starting device, which is suitable for a six-speed transmission, and comprises an upper cover 1, wherein a first transverse hole 101 with an open rear end and a plurality of blind holes parallel to the first transverse hole 101 and closed at the rear end are provided in the upper cover 1. In the present embodiment, a total of four blind holes are provided, and a shift fork shaft hole 102 is further provided in the upper cover 1. The shift fork shaft hole 102 is vertically arranged with the first transverse hole 101, and the shift fork shaft hole 102 is connected with the front end of the first transverse hole 101 and the front end of each blind hole; a first shift fork shaft 2, a second shift fork shaft 3, a third shift fork shaft 4 and a fourth shift fork shaft 5 are sequentially arranged in the shift fork shaft hole 102 from top to bottom, wherein the first shift fork shaft 2 is a first and second gear shift fork shaft, the second shift fork shaft 3 is a third and fourth gear shift fork shaft, the third shift fork shaft 4 is a fifth and sixth gear shift fork shaft, and the fourth shift fork shaft 5 is a reverse gear shift fork shaft. The blind hole 103 includes a first blind hole 103, a second blind hole 104, a third blind hole 105 and a fourth blind hole 106. The first fork shaft 2 is located in front of the first blind hole 103, the second fork shaft 3 is located in front of the second blind hole 104, the third fork shaft 4 is located in front of the third blind hole 105, and the fourth fork shaft 5 is located in front of the fourth blind hole 106; the second fork shaft 3, the third fork shaft 4 and the fourth fork shaft 5 are all provided with positioning grooves along the axial direction of the fork shaft hole 102, and interlocking pins 6 are arranged in the positioning grooves; interlocking steel balls 7 are arranged between two adjacent fork shafts, and the interlocking steel balls 7 can drive the interlocking pins 6 arranged thereunder to move in the same direction; the first fork shaft 2, the second fork shaft 3, the third fork shaft 4 and the fourth fork shaft 5 are all provided with grooves that can match the interlocking steel balls 7.

[0032] A top pin 8 is also provided at the bottom of the fork shaft hole 102, and the upper end of the top pin 8 is connected to the lower end of the fourth fork shaft 5;

[0033] A neutral switch 9 is passed through the first transverse hole 101, and a switch start pin 10 is provided at the front end of the neutral switch 9, wherein the switch start pin 10 contacts the ball head 91 of the push rod of the neutral switch 9, and the front end of the switch start pin 10 abuts against the push pin 8; an axial mounting hole 81 is provided on the push pin 8, and a spring 11 is passed through the mounting hole, and a screw plug 12 is connected to the bottom end of the spring 11, and the screw plug 12 is fixed to the bottom of the fork shaft hole 102.

[0034] As a preferred solution of the present invention, the interlocking steel balls 7 include a first interlocking steel ball 71 , a second interlocking steel ball 72 and a third interlocking steel ball 73 .

[0035] As a preferred embodiment of the present invention, Figure 3 As shown, the mounting hole 81 includes a conical hole 811 and a cylindrical hole 812 which are connected from top to bottom. The large diameter end of the conical hole 811 is connected to the cylindrical hole 812. The spring 11 is inserted into the cylindrical hole 812, and the lower end thereof passes through the cylindrical hole 812.

[0036] As a preferred embodiment of the present invention, Figure 4 As shown, the switch start pin 10 includes a body 1001 and a cone head 1002 which are integrally connected from back to front, and the cone head 1002 is provided with a first inclined surface.

[0037] As a preferred solution of the present invention, a second inclined surface capable of abutting against the first inclined surface is provided at the lower end of the ejector pin 8 .

[0038] As a preferred solution of the utility model, the first transverse hole 101 includes a first through hole, a second through hole and a third through hole which are integrally connected from back to front, the inner diameter of the first through hole is larger than the inner diameter of the second through hole, the inner diameter of the second through hole is larger than the inner diameter of the third through hole, a neutral switch limit step is formed at the connection between the first through hole and the second through hole, and the neutral switch limit step is used to limit the neutral switch, and a switch start pin limit step is formed at the connection between the second through hole and the third through hole, and the switch start pin limit step is used to limit the switch start pin.

[0039] When the utility model is in use:

[0040] When the gearbox is in the neutral position, the ball head of the neutral switch push rod is not squeezed, the internal circuit of the switch is closed, the neutral signal is output, and the vehicle instrument displays N gear. At this time, the engine can read the neutral signal and start normally;

[0041] When the transmission is in gear, Figure 2As shown, after the first shift fork drawer 2 is pushed, it moves along its axial direction, and the groove moves axially along the first shift fork drawer 2 accordingly. The first interlocking steel ball 71 will move axially along the shift fork shaft hole 102 under the extrusion of the first shift fork drawer 2, and the first interlocking steel ball 71 pushes the interlocking pin 6, and the interlocking pin 6 pushes the second interlocking steel ball 72 to move, and finally pushes the top pin 8 to move axially. The second inclined surface on the top pin 8 squeezes the second inclined surface at the front end of the cone head 1002 of the switch start pin 10, so that the switch start pin 10 moves axially along the first transverse hole 101, compressing the ball head of the push rod of the neutral switch 9, disconnecting the internal circuit of the switch, closing the neutral signal, and disappearing the neutral signal of the whole vehicle, realizing the start-close function of the neutral switch 9. After the gear is disengaged, the top pin 8 is reset under the action of the spring 11, and no longer squeezes the switch start pin 10, and the internal circuit of the neutral switch 9 is closed, and the neutral signal is output.

[0042] In the gear shifting state, the first shift fork shaft 2 in the gear continuously squeezes the first interlocking steel ball 71 and the interlocking pin connected to the first interlocking steel ball 71, and the first interlocking steel ball 71 locks the shift fork shafts of the remaining gears, making the other shift fork shafts unable to shift gears, thereby realizing the gear interlocking function.

[0043] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0044] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0045] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A transmission neutral switch starting device, comprising an upper cover (1), wherein the upper cover (1) is provided with a first transverse hole (101) with an open rear end, and a plurality of blind holes parallel to the first transverse hole (101) and with closed rear ends, characterized in that: A shift fork shaft hole (102) is also provided in the upper cover (1), the shift fork shaft hole (102) is arranged perpendicular to the first transverse hole (101), and the shift fork shaft hole (102) is connected to the front end of the first transverse hole (101) and the front end of each blind hole; The fork shaft hole (102) is provided with a first fork shaft (2), a second fork shaft (3), a third fork shaft (4) and a fourth fork shaft (5) in order from top to bottom; the second fork shaft (3), the third fork shaft (4) and the fourth fork shaft (5) are all provided with positioning grooves along the axial direction of the fork shaft hole (102), and an interlocking pin (6) is provided in the positioning groove; and an interlocking steel ball (7) is provided between two adjacent fork shafts; A top pin (8) is also provided at the bottom of the shift fork shaft hole (102), and the upper end of the top pin (8) is connected to the lower end of the fourth shift fork shaft (5); A neutral switch (9) is passed through the first transverse hole (101), a switch start pin (10) is arranged at the front end of the neutral switch (9), and the front end of the switch start pin (10) abuts against the top pin (8); an axial mounting hole (81) is opened on the top pin (8), a spring (11) is passed through the mounting hole, a screw plug (12) is connected to the bottom end of the spring (11), and the screw plug (12) is fixed to the bottom of the fork shaft hole (102).

2. The transmission neutral switch activation device according to claim 1, characterized in that: The interlocking steel balls (7) include a first interlocking steel ball (71), a second interlocking steel ball (72) and a third interlocking steel ball (73).

3. The transmission neutral switch activation device according to claim 1, characterized in that: The mounting hole (81) comprises a conical hole (811) and a cylindrical hole (812) which are connected from top to bottom, the large diameter end of the conical hole (811) is connected to the cylindrical hole (812), the spring (11) is inserted into the cylindrical hole (812), and the lower end thereof passes through the cylindrical hole (812).

4. The transmission neutral switch activation device according to claim 1, characterized in that: The switch start pin (10) comprises a body (1001) and a cone head (1002) which are integrally connected from back to front, and a first inclined surface is arranged on the cone head (1002).

5. The transmission neutral switch activation device according to claim 4, characterized in that: The lower end of the ejector pin (8) is provided with a second inclined surface capable of abutting against the first inclined surface.

6. The transmission neutral switch activation device according to claim 1, characterized in that: The blind holes include a first blind hole (103), a second blind hole (104), a third blind hole (105) and a fourth blind hole (106); the first shift fork shaft (2) is located in front of the first blind hole (103); the second shift fork shaft (3) is located in front of the second blind hole (104); the third shift fork shaft (4) is located in front of the third blind hole (105); and the fourth shift fork shaft (5) is located in front of the fourth blind hole (106).

7. The transmission neutral switch activation device according to claim 1, characterized in that: The first transverse hole (101) comprises a first through hole, a second through hole and a third through hole which are connected in an integrated manner from back to front, the inner diameter of the first through hole is larger than the inner diameter of the second through hole, the inner diameter of the second through hole is larger than the inner diameter of the third through hole, a neutral switch limit step is formed at the connection between the first through hole and the second through hole, and a switch start pin limit step is formed at the connection between the second through hole and the third through hole.

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