Mining truck electric drive axle power take-off assembly

Abstract

The utility model discloses a kind of mine truck electric drive axle power take-off assembly, belong to the technical field of automobile parts, it includes input gear shaft, output gear shaft, power take-off casing, piston cylinder and meshing sleeve etc. Core components, the tooth part of input gear shaft and the tooth part of output gear shaft are conical gear of meshing cooperation, the lower end of output shaft is assembled in the core hole of output gear shaft through roller bearing, the upper end is sequentially connected with output flange assembly through piston cylinder, output shaft bearing, piston cylinder drives piston by air inlet admission, meshing sleeve is driven to move down, realize with the spline coupling of output gear shaft. The assembly adapts mine truck electric drive axle power output scene, can solve the problem that the insufficient installation space of existing cylindrical gear parallel-shaft type power take-off output direction is limited, power is not interrupted to cause energy waste, with compact structure, engagement reliable, energy-efficient features.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile accessories, in particular to an electric drive axle power take-off assembly for mining vehicles. Background Art

[0002] Existing power take-offs matched with electric drive axle reducers of mining vehicles generally adopt a cylindrical gear parallel shaft structural design, and under this structure, the power take-off output is always in an uninterrupted state. In terms of output direction, limited by the transmission characteristics of the parallel shaft of cylindrical gears, the power take-off output direction can only be parallel to the cylindrical gear of the axle reducer, that is, output to both sides of the axle along the central axis of the wheel; however, the frame rails and axle suspension of the mining vehicle occupy most of the space on both sides of the axle, resulting in insufficient installation space for the whole vehicle's power take-off oil pump, poor adaptability, and great inconvenience to actual assembly. At the same time, due to the uninterrupted power design, even when the vehicle is working under working conditions that do not require power take-off, the power take-off will still continue to output power, which not only causes unnecessary power loss, but also significantly increases the energy consumption of the whole vehicle, which does not meet the requirements of high efficiency and energy saving for mining vehicles. Utility Model Content

[0003] The utility model provides an electric drive axle power take-off assembly for a mining vehicle, which can solve the problems of insufficient installation space for the power take-off oil pump caused by limited output direction and energy consumption waste caused by uninterrupted power existing in the existing electric drive axle power take-off for mining vehicles.

[0004] In order to solve the above problems, the technical scheme adopted by the utility model is as follows: the electric drive axle power take-off assembly for a mining vehicle comprises an input gear shaft and an output gear shaft, wherein the tooth part of the input gear shaft and the tooth part of the output gear shaft are conical teeth in meshing fit; a needle roller bearing is arranged in a core hole of the output gear shaft, the lower end of an output shaft is installed in the core hole of the needle roller bearing, and the upper end of the output shaft sequentially passes through a piston cylinder and an output shaft bearing from bottom to top to be connected with an output flange assembly; an output end oil seal is arranged between the output flange assembly and an output shaft bearing seat; the interior of the piston cylinder is divided into a first chamber and a second chamber by a piston; a housing of the piston cylinder is provided with an air port communicated with the first chamber, and a pressure switch for controlling opening and closing of the air port; an engaging sleeve is sleeved on the output shaft located in the second chamber, the output shaft is provided with a first positioning convex ring which extends radially and is installed in the engaging sleeve in a penetrating manner, a spring is sleeved outside the engaging sleeve, the lower end of the spring abuts against a limit table on the outer side of the lower end of the engaging sleeve, and the upper end of the spring is located in the piston; when the engaging sleeve drives the output shaft to move downward, the engaging sleeve is sleeved outside the output gear shaft and is in spline connection with the output gear shaft.

[0005] A more specific technical solution to the above technical solution may be as follows: the power take-off housing includes a horizontal part and a vertical part, the front end of the horizontal part is connected to the reducer housing, the input gear shaft is mounted in the reducer housing through an input shaft bearing, and its teeth are accommodated in the horizontal part, the output gear shaft is mounted in the vertical part through an output gear shaft bearing, a first O-ring is provided at the junction of the horizontal part and the reducer housing, and a first groove is provided on the horizontal part to accommodate the first O-ring.

[0006] Furthermore: the upper end of the vertical part abuts against the lower end of the piston cylinder housing, the upper end of the housing abuts against the lower end of the output shaft bearing seat, the output shaft is mounted on the piston cylinder and the output shaft bearing seat through the output shaft bearing, the middle of the inner wall of the output shaft bearing seat is provided with a radially extending first limiting protrusion ring, the output shaft is provided with a radially extending second limiting protrusion ring, and the output shaft bearing is located between the first limiting protrusion ring and the second limiting protrusion ring; the output end oil seal is fitted on the upper end of the first limiting protrusion ring, the output shaft bearing seat and the output end oil seal are provided with interconnected vertical threaded holes, and the nut is pressed against the upper end of the output shaft bearing seat and the output end oil seal through a double-ended stud inserted in the threaded hole.

[0007] Furthermore: a spacer is provided between the power take-off housing and the engagement sleeve, and a radially extending guide ring is provided on the spacer.

[0008] Furthermore: a piston seat is provided between the housing and the piston; a bearing adjusting washer is provided at the lower end of the output shaft bearing; a piston seat retaining ring is fitted between the bearing adjusting washer and the piston seat; a second groove for accommodating the piston seat retaining ring is provided on the inner wall of the housing; a piston adjusting washer and a piston retaining ring are fitted sequentially from bottom to top on the upper end of the engagement sleeve; a second O-ring is provided between the piston and the housing; a third groove for accommodating the second O-ring is provided on the outer side wall of the lower part of the piston; a third O-ring is provided between the piston seat and the housing; a fourth groove for accommodating the third O-ring is provided on the outer side wall of the piston seat; and a second positioning protrusion ring extending radially and inserted into the piston seat is provided on the outer wall of the piston.

[0009] Furthermore: the input shaft bearing, the output shaft bearing, and the output gear shaft bearing are all deep groove ball bearings; the piston seat retaining ring is a retaining ring for the bore, and the piston retaining ring is a retaining ring for the shaft.

[0010] By adopting the above technical solution, this utility model has the following beneficial effects compared with the prior art: 1. Because this utility model adopts bevel gear meshing transmission to realize the reversal of power direction, and uses the structure of spline engagement / disengagement of the meshing sleeve and the output gear shaft through piston cylinder pneumatic control, it changes the output direction of the traditional parallel shaft power take-off, adapts to the vertical installation space requirements, solves the installation problem of power take-off oil pump, and realizes power on and off as needed, reducing energy loss in non-power take-off working conditions.

[0011] 2. Because the power take-off housing adopts a separate design with horizontal and vertical sections, and is sealed to the reducer housing through the first O-ring, it achieves precise matching and installation with the electric drive axle reducer, improves the sealing and dustproof performance of the connection, avoids the erosion of the internal transmission structure by the harsh mining environment, and simplifies the assembly process.

[0012] 3. Because the output shaft bearing is positioned by double limiting convex rings and the output end oil seal is fixed by double-ended studs and nuts, the coaxiality of the output shaft in vertical operation is guaranteed, the reliability of the oil seal is enhanced, oil leakage is effectively prevented, and the service life of the power take-off unit under high-intensity working conditions is extended.

[0013] 4. Because a spacer with a guide ring is set between the power take-off housing and the engagement sleeve, it plays a precise guiding role in the up and down sliding of the engagement sleeve, avoiding spline connection jamming caused by engagement sleeve misalignment, ensuring smooth power engagement and disengagement, and improving operation response efficiency.

[0014] 5. Due to the independent air passage and multiple O-ring sealing structures inside the piston cylinder, and the optimized assembly clearance through bearing adjustment washers, precise pneumatic control response is achieved, preventing gas leakage from affecting the timely engagement, while ensuring the sealing performance inside the piston cylinder and preventing dust and oil from entering and affecting the operation of the components.

[0015] 6. Because deep groove ball bearings are selected as the support components of each shaft system, and standardized retaining rings for holes and shafts are used for fixing, the load-bearing capacity and operational stability of the power take-off are improved, making it suitable for the high-intensity operating load of mining trucks. At the same time, standardized parts reduce maintenance and replacement costs and assembly errors. Attached Figure Description

[0016] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0017] Figure 2 This is a schematic diagram of the pre-assembly of an embodiment of the present invention.

[0018] Figure 3 This is a schematic diagram of assembly component A according to an embodiment of the present utility model.

[0019] Figure 4 This is a schematic diagram of assembly component B according to an embodiment of the present invention.

[0020] Figure 5 This is a schematic diagram of assembly component C according to an embodiment of the present utility model. Detailed Implementation

[0021] To make the above-mentioned objectives, features, and advantages of this utility model more readily understood, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model; however, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0022] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "fixation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0023] like Figure 1The power take-off (PTO) assembly of the electric drive axle of the mining truck shown includes an input gear shaft 1 and an output gear shaft 2 housed within the PTO housing 6. The teeth of the input gear shaft 1 mesh with the teeth of the output gear shaft 2. The teeth of the input gear shaft 1 and the output gear shaft 2 are bevel teeth that mesh with each other. Specifically, the PTO housing 6 includes a horizontal portion 61 and a vertical portion 62. The front end of the horizontal portion 61 is connected to the reducer housing 5. The input gear shaft 1 is mounted in the reducer housing 5 via an input shaft bearing 4, and its teeth are accommodated in the horizontal portion 62. Inside the vertical section 61, the output gear shaft 2 is mounted in the vertical section 62 via the output gear shaft bearing 3. A first O-ring 10 is provided at the junction of the horizontal section 61 and the reducer housing 5, and a first groove for accommodating the first O-ring is provided on the horizontal section 61. The upper end of the vertical section 62 abuts against the lower end of the piston cylinder 11 housing 111, and the upper end of the piston cylinder 11 housing 111 abuts against the lower end of the output shaft bearing seat 12. The output shaft 7 is mounted in the piston cylinder 11 and the output shaft bearing seat 12 via the output shaft bearing 13. The output gear shaft 2 has a needle roller bearing 15 installed in its core hole. The lower end of the output shaft 7 is installed in the core hole of the needle roller bearing 15, and its upper end passes through the piston cylinder 11 and the output shaft bearing 13 from bottom to top. It is connected to the output flange assembly 16 by bolts 14. An output end oil seal 17 is provided between the output flange assembly 16 and the output shaft bearing housing 12. A radially extending first limiting convex ring 12-1 is provided in the middle of the inner wall of the output shaft bearing housing 12, and a radially extending second limiting convex ring 7-1 is provided on the output shaft 7. The output shaft bearing 13 is located between the first limiting convex ring 12-1 and the second limiting convex ring 7-1. The lower end of the output shaft bearing 13 is provided with a bearing adjusting washer 20. The output end oil seal 17 is fitted on the outer wall of the output flange assembly 16 and is located at the upper end of the first limiting convex ring 12-1. The output shaft bearing housing 12 and the output end oil seal 17 are provided with vertical threaded holes that communicate with each other. The nut 22 is pressed onto the upper end of the output shaft bearing housing 12 and the output end oil seal 17 by a double-ended stud 23 that passes through the threaded hole.

[0024] The piston cylinder 11 includes a housing 111 and a piston 112 and a piston seat 113 disposed within the housing 111. The piston seat 113 is disposed between the housing 111 and the piston 112. The housing 111 is divided into a first chamber a and a second chamber b by the piston 112. The housing 111 has an air port K that communicates with the first chamber a, and a pressure switch 24 that controls the opening and closing of the air port K.

[0025] A meshing sleeve 25 is fitted onto the output shaft located in the second chamber b. The output shaft 7 has a radially extending first positioning protrusion 26 that passes through the meshing sleeve 25. A spring 27 is fitted over the meshing sleeve 25, with its lower end abutting against a limiting platform on the outer side of the lower end of the meshing sleeve 25, and its upper end located inside the piston 112. A piston adjusting washer 28 and a piston retaining ring 29 are sequentially fitted onto the upper end of the meshing sleeve 25 from bottom to top; the piston retaining ring 29 is a shaft retaining ring. A second O-ring 30 is provided between the piston 112 and the housing 111. The outer wall of the piston 112 is provided with a third groove for accommodating the second O-ring. A third O-ring 31 is provided between the piston seat 113 and the housing 111. The outer wall of the piston seat 113 is provided with a fourth groove for accommodating the third O-ring 31. The outer wall of the piston 112 is provided with a second positioning protrusion 32 that extends radially and passes through the piston seat 113. A piston seat fixing ring 21 is fitted between the piston seat 113 and the bearing adjusting washer 20. The piston seat fixing ring 21 is a retaining ring for the hole. The inner wall of the housing 111 is provided with a second groove for accommodating the piston seat fixing ring 21.

[0026] A spacer 33 is provided between the upper part of the power take-off housing 6 and the lower part of the engagement sleeve 25. A radially extending guide ring 34 is provided on the spacer 33. The inner wall of the lower end of the engagement sleeve 25 is provided with an inner spline, and the outer wall of the output gear shaft 2 is provided with an outer spline. When the engagement sleeve 25 drives the output shaft 7 to move downward, the engagement sleeve 25 is fitted over the output gear shaft 2, and the engagement sleeve 25 is splinedly connected to the output gear shaft 2.

[0027] The input shaft bearing 4, the output shaft bearing 13, and the output gear shaft bearing 3 are all deep groove ball bearings; the two ends of the input shaft bearing 4 are respectively fitted with an input shaft bearing shaft retaining ring 4-1 and an input shaft bearing bore retaining ring 4-2; the two ends of the output gear shaft bearing 3 are respectively fitted with an output gear shaft bearing shaft retaining ring 3-1 and an output gear shaft bearing bore retaining ring 3-2.

[0028] The assembly method is as follows: like Figure 2 As shown, mounting positions are reserved on the housing of the mining truck axle reducer. The input shaft bearing 4, input gear shaft 1, input shaft bearing retaining ring 4-1, and input shaft bearing bore retaining ring 4-2 are mounted on the reducer housing 5. The input gear shaft 1 is splinedly connected to the axle reducer gear train. The input gear shaft 1 and input shaft bearing 4 rotate flexibly. This forms a pre-assembly.

[0029] like Figure 3 As shown, the output gear shaft 2, the output gear shaft bearing retaining ring 3-1, the input shaft bearing 4, the output gear shaft bearing retaining ring 3-2, and the spacer 33 are sequentially installed on the power take-off housing 6. Then, the needle roller bearing 15 is installed into the core hole of the output gear shaft 2, allowing the output gear shaft 2 to rotate freely. This constitutes component A.

[0030] like Figure 4 As shown, the engagement sleeve 25, spring 27, piston 112, and second O-ring 30 are sequentially installed into the housing 111 of the piston cylinder 11. The piston adjusting washer 28 and piston retaining ring 29 are used to fix these parts onto the engagement sleeve 25, allowing the engagement sleeve 25 and piston 112 to slide up and down without jamming. Then, the piston seat 113 and third O-ring 31 are installed, and the piston seat 113 is fixed with the piston retaining ring 29. Next, the pressure switch 24 is installed, and finally, the bearing adjusting washer 20 is placed in. This constitutes component B.

[0031] like Figure 5 As shown, the output shaft bearing 13 is mounted on the output shaft 7, and together they are fitted onto the output shaft bearing housing 12. An output end oil seal 17 is pressed into the output shaft bearing housing 12, and the output flange assembly 16 is mounted on the output shaft 7. The output flange assembly 16 and the output shaft 7 rotate freely. This constitutes component C.

[0032] Finally, install the above components A, B, and C onto the axle reducer housing in sequence, and fix them with nuts 22 and studs 23 to make the input gear shaft 1 and output gear shaft 2 mesh with each other. The flange assembly 16 can be rotated flexibly without jamming.

[0033] The electric drive axle power take-off (PTO) assembly of this mining truck innovatively adopts a dual-core design architecture: On the one hand, the input gear shaft is precisely connected to the axle reducer gear train via splines to obtain power. Its bevel teeth then mesh with the bevel teeth of the output gear shaft to achieve vertical reversal of the power transmission direction, completely breaking the limitations of the traditional output direction. On the other hand, relying on the synergistic mechanism of pneumatic control and mechanical reset, when power is needed, a pressure switch triggers air pressure input, pushing the piston to drive the engagement sleeve to achieve spline engagement with the output bevel gear. Power is smoothly transmitted to the external device through the output shaft and output flange assembly. When power is not needed, the air pressure is discharged, and the spring drives the engagement sleeve to quickly disengage from the output bevel gear, realizing power interruption on demand. Throughout the transmission process, deep groove ball bearings and needle roller bearings ensure smooth operation of components, while various seals and fasteners form a solid structural stability defense. This assembly, through core technological innovations such as conical gear reversing transmission, pneumatically controllable engagement, and split-type sealed housing, specifically addresses industry problems such as limited output direction, installation space conflicts, inability to disconnect power, and insufficient sealing reliability of traditional power take-off units. The overall structure is compact and scientifically and rationally laid out, providing convenient vertical installation conditions for the power take-off pump and reducing the overall vehicle energy consumption by switching power on and off as needed. It also has significant advantages such as stable transmission, leak-proof sealing, and convenient maintenance. It can fully meet the high-intensity and high-reliability operation requirements of mining truck electric drive axles under harsh working conditions, and has outstanding practical value and broad prospects for promotion.

[0034] This utility model can be modified and varied in various ways. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model shall be included within the protection scope of this utility model.

Claims

1. A power take-off (PTO) assembly for an electric drive axle of a mining truck, comprising an input gear shaft and an output gear shaft disposed within a PTO housing, characterized in that: The input gear shaft and the output gear shaft have meshing bevel teeth. A needle roller bearing is installed inside the core hole of the output gear shaft. The lower end of the output shaft is installed inside the core hole of the needle roller bearing, and its upper end passes through the piston cylinder and the output shaft bearing sequentially from bottom to top, connecting to the output flange assembly. An output end oil seal is provided between the output flange assembly and the output shaft bearing housing. The piston cylinder is divided into a first chamber and a second chamber by a piston. An opening on the piston cylinder housing connects to the first chamber. The air inlet is provided with a pressure switch to control the opening and closing of the air inlet; a meshing sleeve is fitted on the output shaft located in the second chamber, and a first positioning protrusion ring extending radially and inserted into the meshing sleeve is provided on the output shaft. A spring is fitted on the meshing sleeve, and the lower end of the spring abuts against the limiting platform on the outer side of the lower end of the meshing sleeve, while its upper end is located inside the piston; when the meshing sleeve drives the output shaft to move downward, the meshing sleeve is fitted onto the output gear shaft and splinedly connected to the output gear shaft.

2. The power take-off assembly of the electric drive axle of the mining truck according to claim 1, characterized in that: The power take-off housing includes a horizontal portion and a vertical portion. The front end of the horizontal portion is connected to the reducer housing. The input gear shaft is mounted in the reducer housing via an input shaft bearing, and its teeth are housed in the horizontal portion. The output gear shaft is mounted in the vertical portion via an output gear shaft bearing. A first O-ring is provided at the junction of the horizontal portion and the reducer housing, and a first groove is provided on the horizontal portion to accommodate the first O-ring.

3. The power take-off assembly of the electric drive axle of the mining truck according to claim 2, characterized in that: The upper end of the vertical section abuts against the lower end of the piston cylinder housing, and the upper end of the housing abuts against the lower end of the output shaft bearing seat. The output shaft is mounted on the piston cylinder and the output shaft bearing seat at the junction through the output shaft bearing. The middle of the inner wall of the output shaft bearing seat is provided with a radially extending first limiting protrusion ring, and the output shaft is provided with a radially extending second limiting protrusion ring. The output shaft bearing is located between the first limiting protrusion ring and the second limiting protrusion ring. The output end oil seal is fitted on the upper end of the first limiting protrusion ring. The output shaft bearing seat and the output end oil seal are provided with interconnected vertical threaded holes. The nut is pressed against the upper end of the output shaft bearing seat and the output end oil seal through a double-ended stud inserted in the threaded hole.

4. The power take-off assembly of the electric drive axle of the mining truck according to claim 3, characterized in that: A spacer is provided between the power take-off housing and the engagement sleeve, and a radially extending guide ring is provided on the spacer.

5. The power take-off assembly for the electric drive axle of a mining truck according to claim 4, characterized in that: A piston seat is provided between the housing and the piston. A bearing adjusting washer is provided at the lower end of the output shaft bearing. A piston seat retaining ring is fitted between the bearing adjusting washer and the piston seat. A second groove is provided on the inner wall of the housing to accommodate the piston seat retaining ring. A piston adjusting washer and a piston retaining ring are fitted sequentially from bottom to top on the upper end of the engagement sleeve. A second O-ring is provided between the piston and the housing. A third groove is provided on the outer side wall of the lower part of the piston to accommodate the second O-ring. A third O-ring is provided between the piston seat and the housing. A fourth groove is provided on the outer side wall of the piston seat to accommodate the third O-ring. A second positioning protrusion is provided on the outer wall of the piston, extending radially and inserted into the piston seat.

6. The power take-off assembly of the electric drive axle of the mining truck according to claim 5, characterized in that: The input shaft bearing, the output shaft bearing, and the output gear shaft bearing are all deep groove ball bearings; the piston seat retaining ring is a retaining ring for the bore, and the piston retaining ring is a retaining ring for the shaft.

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