Mechanical connection locking structure for shifting fork and shifting fork shaft of mining power takeoff

Abstract

The utility model provides a mechanical connection locking structure for a shifting fork and a shifting fork shaft of a mining power takeoff, and aims to solve the technical problem that the failure rate of the power takeoff is high due to the fact that the traditional connection fastening mode of the shifting fork and the shifting fork shaft of the power takeoff is insufficient in connection strength. Comprising a shifting fork shaft, a shifting fork and two roll pins, the shifting fork comprises a connecting sleeve and a fork body, the fork body is arranged on the outer side of the connecting sleeve, two pairs of connecting through holes are symmetrically formed in the peripheral face of the connecting sleeve in the radial direction, and two positioning through holes which are equal to the two pairs of connecting through holes in diameter and correspond to the two pairs of connecting through holes in position are formed in the peripheral face of the working end of the shifting fork shaft. Each roll pin penetrates through the connecting through hole and the positioning through hole to fixedly sleeve the shifting fork at the working end of the shifting fork shaft; the front end of the working end of the shifting fork shaft extends out of the connecting sleeve of the shifting fork, the outer side wall of the extending part is provided with a trigger face in the axial direction, the trigger face is parallel to a split, passing through the central axis of the connecting sleeve, of the fork body, and the fork body is located on the left side of the trigger face.

Description

Technical Field

[0001] This utility model relates to a vehicle connection locking structure, specifically to a mechanical connection locking structure between a mining power take-off fork and its shaft. Background Technology

[0002] In existing technologies, most non-road wide-body mining trucks used in mining areas use power take-offs (PTOs) to power the vehicle's lifting pump. If the PTO fails, it will directly cause the lifting function of the entire vehicle to fail, thus affecting the vehicle's unloading and other operations. The key to whether the PTO can work properly lies in whether the connection and locking between the shift fork and the shift fork shaft in the PTO shift mechanism is tight. The traditional method of fastening the shift fork and shift fork shaft of a power take-off (PTO) typically involves passing a locking screw with a hole in its head through the mounting hole of the shift fork and tightening it into the threaded hole of the shift fork shaft. A steel wire is then inserted into the hole in the head of the locking screw to prevent loosening. This method not only occupies installation space in the PTO's shifting mechanism but also requires additional steps such as inserting the steel wire after tightening the locking screw, making the assembly process complex and time-consuming. Furthermore, the connection strength is generally weak, and the steel wire used for preventing loosening is easily omitted during assembly. This can lead to the locking screw loosening and falling into the PTO during operation, causing serious malfunctions such as gear wear. Therefore, this connection and fastening method has a high failure rate and poses significant safety hazards under PTO operating conditions.

[0003] Chinese patent CN108930788A discloses a transmission shift fork structure, including a shift fork shaft, a first shift fork assembly, and at least one second shift fork assembly. The first shift fork assembly includes a first shift fork and a first shift block that cooperates with a shift lever. The second shift fork assembly includes a second shift fork and a second shift block that cooperates with a shift lever. By sliding the second shift fork assembly with the shift fork shaft, it shares a single insertion shaft with the first shift fork assembly, ensuring that the first and second shift fork assemblies do not interfere with each other during use. This solution saves on the shift fork shaft and the space occupied by the shift fork installation, but it still does not solve the technical problems that are prone to occur in the traditional connection and fastening method between the power take-off shift fork and the shift fork shaft. Utility Model Content

[0004] The purpose of this utility model is to solve the technical problem that the traditional connection and fastening method of the power take-off fork and the fork shaft has insufficient connection strength, resulting in a high failure rate of the power take-off. Therefore, this utility model provides a mechanical connection locking structure for the power take-off fork and the fork shaft of a mining power take-off.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0006] A locking structure for the mechanical connection between the fork and the fork shaft of a mining power take-off unit is characterized by comprising:

[0007] Shift fork shaft, shift fork, and two coiled pins;

[0008] The shift fork includes a connecting sleeve and a fork body. The fork body is disposed on the outside of the connecting sleeve. The working end of the shift fork shaft is inserted into the connecting sleeve. The outer circumferential surface of the connecting sleeve is symmetrically provided with two pairs of connecting through holes along the radial axis. The outer circumferential surface of the working end of the shift fork shaft is provided with two positioning through holes of the same diameter and corresponding to the two pairs of connecting through holes.

[0009] Each coil pin passes through a pair of connecting through holes and is inserted into the corresponding positioning through hole. The fork is fixedly sleeved on the working end of the fork shaft by the two pairs of coil pins.

[0010] The front end of the working end of the shift fork shaft extends out of the connecting sleeve of the shift fork, and the outer wall of the extended part is provided with a trigger surface that is parallel to the axis of the shift fork shaft and extends axially, for triggering the power take-off switch. The trigger surface is parallel to the midpoint of the fork body passing through the central axis of the connecting sleeve, and the fork body is located to the left of the trigger surface.

[0011] Furthermore, the axes of the two positioning through holes are perpendicular to the surface of the trigger surface and pass through the axis of the connecting sleeve.

[0012] Furthermore, one of the two positioning through holes is located near the front end of the connecting sleeve, and the other is located near the rear end of the connecting sleeve.

[0013] Further defined: the radius of the front end of the working end of the shift fork shaft is R1, and the depth of the positioning through hole is 2R1.

[0014] Furthermore, to facilitate disassembly later, we define the sidewall thickness of the connecting sleeve as H and the axial length of the coiled pin as L, then we have: 2H+2R1<L.

[0015] Furthermore, the coiled pin is a hollow cylindrical structure with an opening along the axial direction on its outer circumference, and the two thin edges on both sides of the opening can be rolled together.

[0016] Both ends of the coiled pin are provided with chamfered and narrowed openings that match the diameter of the connecting through hole.

[0017] Furthermore, the coiled pin is a hollow cylindrical structure with an opening along the axial direction on its outer circumference, and the two thin edges on both sides of the opening can be rolled together.

[0018] One end of the coiled pin is provided with a chamfered end that matches the diameter of the connecting through hole.

[0019] Furthermore, the coiled pin has an interference fit with the wall of the connecting through hole and the positioning through hole.

[0020] Furthermore, the trigger surface and the end face of the working end of the shift fork shaft are connected by an inclined plane to achieve stress buffering between the trigger surface and the power take-off switch.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) This utility model locks and fixes the two coiled pins by hammering them through the pre-set connecting through hole on the outer circumference of the shift fork connecting sleeve and the pre-set positioning through hole on the outer circumference of the shift fork shaft. Compared with the prior art, which uses a steel wire inserted into a stop screw with a hole in the head for fixing and preventing loosening, this solution is not only simple and convenient to operate, but also has high connection strength. There is no serious fault such as the coiled pins falling into the power take-off and causing the power take-off gear to break due to loosening of the connecting parts. It is safe and saves assembly space.

[0023] (2) The coiled pin in this utility model has chamfered ends and an opening on the outer circumference. When hammering, the chamfered ends guide the coiled pin to be inserted into the connecting through hole and the positioning through hole. During the insertion process, the opening will be tightened and contracted, and the thin edges on both sides will be rolled together. The elasticity will generate radial pressure with the hole walls of the connecting through hole and the positioning through hole. The tight connection between the shift fork and the shift fork shaft can ensure the stable transmission of torque during the power transmission process and the positioning accuracy between the shift fork and the shift fork shaft.

[0024] (3) The end face of the working end of the shift fork shaft and the trigger face are connected by an inclined plane transition, which can buffer the stress when the shift fork shaft moves in the shift mechanism to trigger the power take-off switch, avoid wear of the shift fork shaft and the power take-off switch, and improve service life. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural diagram of an embodiment of the mechanical connection and locking structure between the fork and the fork shaft of a mining power take-off device according to this utility model;

[0026] Figure 2 This is a schematic diagram of the structure of the shift fork in an embodiment of the mechanical connection and locking structure between the shift fork and the shift fork shaft of a mining power take-off device according to this utility model;

[0027] Figure 3 This is a schematic diagram of the fork shaft in an embodiment of the mechanical connection and locking structure of a mining power take-off fork and fork shaft according to the present invention.

[0028] In the diagram: 1-shift fork shaft, 2-shift fork, 21-connecting sleeve, 22-fork body, 3-coil pin, 4-trigger surface. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] See appendix Figure 1 and Figure 2As shown, this embodiment provides a mechanical connection locking structure for a mining power take-off (PTO) fork and fork shaft, including a fork shaft 1, a fork 2, and two coiled pins 3. The fork 1 includes a connecting sleeve 21 and a fork body 22. The fork body 22 is located outside the connecting sleeve 21, and the outer circumferential surface of the connecting sleeve 21 has two pairs of connecting through holes symmetrically arranged along the radial axis. The outer circumferential surface of the working end of the fork shaft 1 is provided with two positioning through holes corresponding to the positions of the two pairs of connecting through holes. The inner diameter of the positioning through holes is equal to that of the connecting through holes. The fork 2 is locked by passing the two coiled pins 3 sequentially through one of each pair of connecting through holes and then through the positioning through holes. The positioning through hole and the other of each pair of connecting through holes are used to fix the shift fork 2 to the working end of the shift fork shaft 1. The coiled pin 3 is interference-fitted with the hole wall of the connecting through hole and the positioning through hole. Specifically, the front end radius of the working end of the shift fork shaft is R1, and the depth of the positioning through hole is 2R1. The front end of the working end of the shift fork shaft 1 extends out of the connecting sleeve 21 of the shift fork 2, and the outer side wall of the extended part is provided with a trigger surface 4 along the axial direction. The trigger surface 4 and the end face of the working end of the shift fork shaft 1 are connected by an inclined plane, which can play a role in buffering stress when the shift fork shaft 1 moves to trigger the power take-off switch.

[0031] like Figure 3 As shown, two positioning through holes are symmetrically arranged on the outer peripheral surface of the working end of the shift fork shaft 1. The axis of the positioning through hole is perpendicular to the surface of the trigger surface 4 and passes through the axis of the connecting sleeve 21. The trigger surface 4 is parallel to the midpoint of the fork body 22 that passes through the central axis of the connecting sleeve 21, and the fork body 22 is located to the left of the trigger surface 4.

[0032] The coiled pin 3 is a hollow cylindrical structure with an axial opening on its outer circumference, and thin edges on both sides of the opening. Both ends of the coiled pin 3 have chamfered constrictions that match the diameter of the connecting through holes. When the coiled pin 3 is hammered into the corresponding connecting through holes and positioning through holes, the chamfered constrictions first enter the connecting through holes to guide the coiled pin 3 into insertion smoothly. During insertion, the opening will tighten and the two thin edges will curl together, generating radial pressure against the walls of the connecting through holes and positioning through holes through elasticity, thus achieving a tight connection. The axial length of the coiled pin 3 is greater than the combined thickness of the connecting through holes and positioning through holes, which facilitates disassembly later. This connection and fastening method is simple and quick to operate, saves assembly space, and has high connection strength, ensuring stable torque transmission and relative positioning accuracy between components during power transmission.

[0033] The above are merely embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the technical solution of this utility model should be included within the protection scope of this utility model. Furthermore, it should be noted that the accompanying drawings are merely illustrative and are not drawn to scale, and should not be construed as limiting the actual scope of protection claimed by this utility model.

Claims

1. A locking structure for the mechanical connection between the fork and the fork shaft of a mining power take-off device, characterized in that, include: The shift fork shaft (1), the shift fork (2), and two coil pins (3); The shift fork (2) includes a connecting sleeve (21) and a fork body (22). The fork body (22) is disposed on the outside of the connecting sleeve (21). The working end of the shift fork shaft (1) is inserted into the connecting sleeve (21). The outer circumferential surface of the connecting sleeve (21) is symmetrically provided with two pairs of connecting through holes along the radial axis. The outer circumferential surface of the working end of the shift fork shaft (1) is provided with two positioning through holes of the same diameter and corresponding to the two pairs of connecting through holes. Each coil pin (3) passes through a pair of connecting through holes and is inserted into the corresponding positioning through hole. The fork (2) is fixedly sleeved on the working end of the fork shaft (1) by the two pairs of coil pins (3). The front end of the working end of the shift fork shaft (1) extends out of the connecting sleeve (21) of the shift fork (2), and the outer side wall of the extended part is provided with a trigger surface (4) that is parallel to the axis of the shift fork shaft (1) and extends axially, for triggering the power take-off switch. The trigger surface (4) is parallel to the midpoint of the fork body (22) passing through the central axis of the connecting sleeve (21), and the fork body (22) is located to the left of the trigger surface (4).

2. The locking structure for mechanical connection between the fork and the fork shaft of a mining power take-off device according to claim 1, characterized in that: The axes of the two positioning through holes are perpendicular to the surface of the trigger surface (4) and pass through the axis of the connecting sleeve (21).

3. The locking structure for mechanical connection between the fork and the fork shaft of a mining power take-off device according to claim 2, characterized in that: One of the two positioning through holes is located near the front end of the connecting sleeve (21), and the other is located near the rear end of the connecting sleeve (21).

4. A locking structure for mechanical connection between the fork and the fork shaft of a mining power take-off device according to any one of claims 1-3, characterized in that: Definition: The radius of the front end of the working end of the shift fork shaft (1) is R1, and the depth of the positioning through hole is 2R1.

5. The locking structure for mechanical connection between the fork and the fork shaft of a mining power take-off device according to claim 4, characterized in that: Definition: The sidewall thickness of the connecting sleeve (21) is H, and the axial length of the coiled pin (3) is L. Then: 2H+2R1<L.

6. The locking structure for mechanical connection between the fork and the fork shaft of a mining power take-off device according to claim 1, characterized in that: The coiled pin (3) is a hollow column structure with an opening along the axial direction on its outer circumference and thin edges on both sides of the opening. The two ends of the coiled pin (3) are provided with chamfered necks that match the diameter of the connecting through hole.

7. The locking structure for mechanical connection between the fork and the fork shaft of a mining power take-off device according to claim 1, characterized in that: The coiled pin (3) is a hollow column structure with an opening along the axial direction on its outer circumference and thin edges on both sides of the opening. One end of the coiled pin (3) is provided with a chamfered end that matches the diameter of the connecting through hole.

8. The locking structure for mechanical connection between the fork and the fork shaft of a mining power take-off device according to claim 1, characterized in that: The coiled pin (3) is interference-fitted with the wall of the connecting through hole and the positioning through hole.

9. The locking structure for mechanical connection between the fork and the fork shaft of a mining power take-off device according to claim 1, characterized in that: The trigger surface (4) and the end face of the working end of the shift fork shaft (1) are connected by an inclined plane to achieve stress buffering between the trigger surface (4) and the power take-off switch.

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