Power take-off device and electric drive system

Abstract

The utility model relates to a power take-off device and an electric drive system. The power take-off device comprises a shell, a transmission shaft, a power take-off shaft sleeve, a pushing assembly and an output connecting piece. One end of the transmission shaft is sleeved with the power take-off shaft sleeve, and the other end of the transmission shaft is connected with the output connecting piece; the power take-off shaft sleeve is in sliding connection with the transmission shaft through a first guide assembly structure, the sliding direction is in the axial direction of the transmission shaft, and the end of the power take-off shaft sleeve is a tooth-shaped end capable of being in butt-joint meshing with a power shaft of the gearbox. The pushing assembly is arranged on the outer side of the power take-off shaft sleeve in a sleeving mode and can slide relative to the shell so as to push the power take-off shaft sleeve to move outwards in the axial direction, and a closed space is defined by the pushing assembly and the shell jointly. The shell is provided with an inflation inlet communicated with the closed space. According to the power takeoff device, the space occupied in the radial direction can be reduced, the equipment size is reduced, and the problem of clamping stagnation between the power takeoff shaft sleeve and the power shaft in the butt-joint power takeoff process can be solved through connection in a butt-joint meshing mode.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of heavy truck accessories, and particularly relates to a power take-off device and electric drive system. BACKGROUND

[0002] Pure electric drive heavy commercial trucks mostly adopt central electric drive and electric drive axle two driving modes to realize vehicle power transmission, and the electric drive axle has more development potential due to the smaller installation space. The power take-off device is widely arranged and used on traditional fuel vehicles and central electric drive vehicles, but is less arranged on electric drive axle vehicles.

[0003] At present, the electric drive axle system integrated with the power take-off device mostly adopts a single power take-off shaft, and transmits power to the gear of the gear box through gear meshing, which increases the arrangement space and is not compact in structure, and is not conducive to cost control. The above problems need to be solved urgently. UTILITY MODEL CONTENTS

[0004] The utility model discloses a kind of power take-off device and electric drive system, to solve the technical problem existing in prior art.

[0005] The utility model adopts the following technical solutions:

[0006] In the first aspect, the utility model provides a kind of power take-off device, it includes shell, transmission shaft, power take-off shaft sleeve, push assembly and outer transport connecting piece;The transmission shaft is rotatably connected in the shell, and one end is equipped with the power take-off shaft sleeve, the other end is connected with the outer transport connecting piece;The power take-off shaft sleeve is slidably connected with the transmission shaft by first guide component structure, and sliding direction is along the transmission shaft axial direction, and the power take-off shaft sleeve end is the toothed end that can be butted with the power shaft of gear box and engages;The push assembly is set outside the power take-off shaft sleeve, and can be relatively slid with the shell, to push the power take-off shaft sleeve and move outward along axial direction, the push assembly and the shell jointly enclose closed space;Air inlet that is communicated with the closed space is provided on the shell.

[0007] In the power take-off device of the utility model, the push assembly includes mobile pull fork and sealing shaft sleeve;The mobile pull fork is located in the shell, and is set outside the power take-off shaft sleeve, the side of the mobile pull fork close to the toothed end of the power take-off shaft sleeve is matched with the shell gap, and is sealingly connected, the other side is spaced apart from the inner wall of the shell, and is used to push the power take-off shaft sleeve;The sealing shaft sleeve is arranged between the mobile pull fork and the inner wall of the shell, and is sealingly connected with both.

[0008] In the power taking device, the pushing assembly further comprises a moving sliding sleeve and a first sealing ring; the moving pulling fork is provided with an annular flange on the side close to the toothed end of the power taking shaft sleeve; the annular flange is provided with a first sealing groove; the first sealing groove is located on the circumferential side surface and the end surface of the annular flange; the first sealing ring is arranged in the first sealing groove; and the moving sliding sleeve is sleeved on the moving pulling fork and abuts against the first sealing ring.

[0009] In the power taking device, the inner side surface of the moving pulling fork is provided with a pushing protrusion; and the power taking shaft sleeve is provided with an accommodating groove for accommodating the end of the pushing protrusion.

[0010] In the power taking device, a first clamping ring is further arranged in the first clamping groove in the inner wall of the shell and protrudes from the first clamping groove, so as to limit the movement of the pushing assembly towards the external conveying connecting piece.

[0011] In the power taking device, the shell is provided with a first sealing gasket on the side end surface close to the toothed end of the power taking shaft sleeve; and the shell is sealingly connected to the gear box through the first sealing gasket.

[0012] In the power taking device, the external conveying connecting piece comprises an output flange, a flange gasket, a flange bolt and a fourth sealing ring; the output flange is a necked flange, the neck is sleeved on the outer side of the transmission shaft, the end of the neck is located between the shell and the transmission shaft, and the neck is sealingly connected to the shell through the oil seal on the shell; the center of the flange plate of the output flange is provided with an accommodating groove; the flange gasket is located in the accommodating groove and is sealingly connected to the side wall of the accommodating groove through the fourth sealing ring; and the flange bolt is screwed to the transmission shaft after penetrating through the flange gasket.

[0013] In the power taking device, an elastic member is further arranged between the shell and the pushing assembly.

[0014] In the power taking device, a bushing or a bearing is sleeved on the side close to the toothed end of the power taking shaft sleeve.

[0015] In the second aspect, the utility model further provides an electric drive system which comprises the power taking device and the gear box.

[0016] The technical scheme of the utility model can achieve the following beneficial effects:

[0017] The utility model mainly provides a kind of power taking device, based on the power taking shaft sleeve's toothed end and the power shaft of gear box butt joint engagement, can reduce the space occupied in radial direction, reduce equipment size, and with the way of butt joint engagement connection, can avoid the jamming problem between power taking shaft sleeve and the power shaft of gear box in the process of butt joint power taking, improve the stability of power taking process;With the way of structure simple, reliable that pusher assembly promotes power taking shaft sleeve to take power. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme of the utility model embodiment, the following will be to the embodiment description needed to use the drawing briefly introduced, constitutes the utility model a part, the utility model of illustrative embodiment and its explanation the utility model, and does not constitute improper limitation to the utility model.In the drawings:

[0019] Figure 1 It is one of the three-dimensional structure schematic diagram of the utility model's power taking device;

[0020] Figure 2 It is the sectional structure schematic diagram of the utility model's power taking device;

[0021] Figure 3 It is the local structure schematic diagram of the utility model's airtight space;

[0022] Figure 4 It is the local structure schematic diagram of the utility model's airtight space;

[0023] Figure 5 It is the second three-dimensional structure schematic diagram of the utility model's power taking device;

[0024] Figure 6 It is the structure schematic diagram of the utility model's electric drive system.

[0025] BRIEF DESCRIPTION OF DRAWINGS

[0026] 1. housing;11. inflation port;12. first clamping groove;13. first sealing gasket;14. plugging head;15. oil seal;2. transmission shaft;3. power taking shaft sleeve;4. pusher assembly;41. moving pull fork;411. annular flange;412. first sealing groove;413. push protrusion;42. sealing shaft sleeve;43. moving sliding sleeve;44 first sealing ring;45. second sealing ring;46. third sealing ring;5. external delivery connecting piece;51. output flange;511. containing groove;52. flange gasket;53. flange bolt;54. fourth sealing ring;6. first guide assembly;7. airtight space;8. first clamping ring;9. second guide assembly;101. elastic member;102. second clamping ring;103. bearing. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the utility model clearer, the utility model technical scheme will be described clearly and completely in combination with specific embodiments of the utility model and corresponding drawings. In the description of the utility model, it needs to be indicated that the term "or" is usually used in the meaning of including "and / or", unless the content is explicitly indicated otherwise.

[0028] In the description of the utility model, it needs to be indicated that, unless explicitly specified and limited otherwise, the terms "mounting", "connection" and "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or magnetic connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For ordinary skilled person in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances. In addition, in the description of the application, the terms "first", "second" and the like are only used for distinguishing description, and cannot be understood as indicating or implying relative importance. In the description of the utility model, the meaning of "multiple" is at least two, for example, two, three or more, unless explicitly specified and limited.

[0029] Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary skilled person in the art without making creative labor belong to the scope protected by the utility model.

[0030] To solve the problems in the prior art, the embodiment of the application provides a power taking device and an electric drive system.

[0031] Embodiment 1

[0032] The embodiment provides a power taking device, as shown in Figure 1 and 2 1. It comprises a shell 1, a transmission shaft 2, a power taking shaft sleeve 3, a pushing assembly 4 and an external conveying connecting piece 5; the transmission shaft 2 is rotationally connected in the shell 1, and one end is sleeved with the power taking shaft sleeve 3, and the other end is connected with the external conveying connecting piece 5; the power taking shaft sleeve 3 is slidably connected with the transmission shaft 2 through the first guide assembly 6 structure, and the sliding direction is along the axial direction of the transmission shaft 2, and the end part of the power taking shaft sleeve 3 is a toothed end capable of being butted and engaged with the power shaft of the gear box; the pushing assembly 4 is sleeved outside the power taking shaft sleeve 3, and can slide relative to the shell 1 to push the power taking shaft sleeve 3 to move outward along the axial direction, and the pushing assembly 4 and the shell 1 jointly enclose a closed space 7; the shell 1 is provided with an inflation port 11 communicating with the closed space 7, and the inflation port 11 is used for external connection of a pressure source.

[0033] The utility model discloses a kind of power taking devices, based on the toothed end of power taking shaft sleeve and gear box shaft butt joint engagement, can reduce the space occupied in radial direction, reduce equipment size, and with butt joint engagement mode connection, can avoid the jamming problem between power taking shaft sleeve and power shaft of gear box in the process of butt joint power taking, improve the stability of power taking process;With the structure simple, reliable of the way structure of pushing assembly to push power taking shaft sleeve to take power.

[0034] In some preferred embodiments, a sealing head 14 is arranged on the inflation port 11.

[0035] In some preferred embodiments, the transmission shaft 2 is rotatably connected with the housing 1 through a bearing 103.

[0036] In some preferred embodiments, as shown in Figure 1 , the first guide assembly 6 is a guide groove and a guide block; based on this, while performing axial guide sliding, the rotation of the power taking shaft sleeve 3 around the axis is limited.

[0037] In some preferred embodiments, as shown in Figure 1 , the toothed end face of the power taking shaft sleeve 3 is circumferentially spaced apart and provided with a plurality of protruding teeth; the protruding teeth extend axially along the power taking shaft sleeve 3; correspondingly, the shaft end face of the gear box is provided with mating protruding teeth that can be inserted between the protruding teeth.

[0038] In some preferred embodiments, as shown in Figure 2 and 3 , the pushing assembly 4 includes a movable pull fork 41 and a sealing shaft sleeve 42; the movable pull fork 41 is located inside the housing 1 and is sleeved outside the power taking shaft sleeve 3, one side of the movable pull fork 41 close to the toothed end of the power taking shaft sleeve 3 is gap-fitted and sealingly connected with the housing 1, and the other side is spaced apart from the inner wall of the housing 1 and is used for pushing the power taking shaft sleeve 3; the sealing shaft sleeve 42 is arranged between the movable pull fork 41 and the inner wall of the housing 1 and is sealingly connected with both; based on the arrangement of the sealing shaft sleeve 42, on the one hand, the moving direction of the movable pull fork 41 is guided, and on the other hand, a sealing member is arranged on both sides of the sealing shaft sleeve 42 for sealing, which can improve the sealing effect and reduce the processing requirements of the sealing shaft sleeve 42.

[0039] Preferably, the sealing shaft sleeve 42 is sealingly connected with the movable pull fork 41 and the housing 1 through a second sealing ring 45 and a third sealing ring 46.

[0040] In some preferred embodiments, as shown in Figure 2 and 3As shown, the pushing assembly 4 further comprises a moving sliding sleeve 43 and a first sealing ring 44; the moving pulling fork 41 is provided with an annular flange 411 on one side close to the toothed end of the power take-off shaft sleeve 3; the annular flange 411 is provided with a first sealing groove 412; the first sealing groove 412 is located on the circumferential side and the end face of the annular flange 411; the first sealing ring 44 is arranged in the first sealing groove 412; the moving sliding sleeve 43 is sleeved on the moving pulling fork 41 and abuts against the first sealing ring 44; based on the moving sliding sleeve 43 and the first sealing groove 412 jointly limiting the first sealing ring 44, on the one hand, the effect of limiting the first sealing ring 44 is improved, and on the other hand, the replacement of the first sealing ring 44 is facilitated.

[0041] In some preferred embodiments, as shown in the drawings, Figure 2 and 4 As shown, the inner side surface of the moving pulling fork 41 is provided with a pushing protrusion 413; the power take-off shaft sleeve 3 is provided with a containing groove 31 for containing the end of the pushing protrusion 413.

[0042] Preferably, the side wall on one side of the containing groove 31 is formed by the power take-off shaft sleeve 3, and the side wall on the other side is formed by the second clamping ring 102 clamped on the power take-off shaft sleeve 3; based on this, the power take-off shaft sleeve 3 is facilitated to be disassembled and assembled, that is, the second clamping ring 102 is removed, and then the power take-off shaft sleeve 3 is taken out from the side where the second clamping ring 102 is arranged, at this time, the diameter of the side where the second clamping ring 102 is arranged is smaller than the inner diameter of the power take-off shaft sleeve 3.

[0043] In some preferred embodiments, as shown in the drawings, Figure 2 Further comprising a first clamping ring 8; the first clamping ring 8 is arranged in the first clamping groove 12 of the inner wall of the housing 1 and protrudes out of the first clamping groove 12, for limiting the movement of the pushing assembly 4 towards the outer conveying connector 5, specifically, limiting the movement of the sealing shaft sleeve 42; based on the limiting effect of the first clamping ring 8, the movement of the pushing assembly 4 is avoided to be excessive, which affects the sealing performance of the sealed space 7.

[0044] In some preferred embodiments, as shown in the drawings, Figure 1 The housing 1 is provided with a first sealing gasket 13 on the end face of the side close to the toothed end of the power take-off shaft sleeve 3; the housing 1 is sealingly connected to the gear box through the first sealing gasket 13; in this way, the oil in the gear box is prevented from leaking out.

[0045] In some preferred embodiments, as shown in the drawings, Figure 1 , 2As shown in Figure 5, the external transmission connection part 5 includes an output flange 51, a flange gasket 52, a flange bolt 53 and a fourth sealing ring 54; the output flange 51 is a neck flange, the neck of which is sleeved on the outside of the transmission shaft 2, and the end of the neck is located between the housing 1 and the transmission shaft 2, and is sealed to the housing 1 through the oil seal 15 on the housing 1; the center of the flange plate of the output flange 51 has a receiving groove 511; the flange gasket 52 is located in the receiving groove 511, and is sealed to the side wall of the receiving groove 511 through the fourth sealing ring 54; the flange bolt 53 passes through the flange gasket 52 and is screwed to the transmission shaft 2; the output flange 51 is used for external transmission docking, which is more convenient, and is equipped with an oil seal 15 and a fourth sealing ring 54.

[0046] Preferably, the output flange 51 is slidably connected to the transmission shaft 2 via a second guide assembly 9, with the sliding direction being along the axial direction of the transmission shaft 2; the second guide assembly 9 can limit the rotation of the output flange 51 around the axis of the transmission shaft 2; specifically, the second guide assembly 9 is a guide groove and a guide block.

[0047] In some preferred embodiments, Figure 2 As shown, it also includes an elastic member 101; the elastic member 101 is pressed between the shell 1 and the pushing assembly 4; based on the elastic pushing of the elastic member 101, when the pressure in the confined space 7 is reduced, it can push the moving fork 41 and then drive the power take-off sleeve 3 to reset, thereby realizing the switching between the power take-off state and the non-power take-off state.

[0048] Preferably, the elastic member 101 is a spring.

[0049] In some preferred embodiments, Figure 1 As shown, a bushing or a bearing is provided on one side of the transmission shaft 2 adjacent to the toothed end of the power take-off sleeve 3; based on this, the friction during rotation can be supported and reduced. Since the shaft of the gearbox and the transmission shaft 2 of the power take-off device are connected through the bushing or the bearing, compared with a floating transmission shaft without a bushing or bearing to engage with the intermediate shaft of the gearbox, the coaxiality of the entire axial direction is better guaranteed.

[0050] Example 2

[0051] This embodiment provides an electric drive system, such as Figure 6 As shown, it includes the power take-off device A and the gear box B in the above embodiment 1; the power take-off sleeve 3 of the power take-off device A is docked and meshed with the power shaft of the gear box B, such as docked and meshed with the intermediate shaft of the gear box.

[0052] The electric drive system can reduce the space occupied in the radial direction, reduce the equipment size, and is connected in a butt joint engagement mode, so that the jamming problem between the power shaft sleeve and the power shaft of the gear box B in the butt joint power taking process can be avoided, and the stability of the power taking process is improved.

[0053] The embodiments of the utility model are described above in combination with the drawings, but the utility model is not limited to the specific embodiments described above, and the specific embodiments described above are only illustrative but not restrictive, and many forms can be made by the ordinary skilled in the art under the inspiration of the utility model without departing from the scope of the utility model and the protection scope of the claims, and all belong to the protection of the utility model.

Claims

1. A power take-off device, characterized in that: It includes a housing, a transmission shaft, a power take-off sleeve, a push assembly and an external transmission connector; The transmission shaft is rotatably connected to the housing, with one end being sleeved with the power take-off sleeve and the other end being connected to the external transmission connector; The power take-off sleeve is slidably connected to the transmission shaft via a first guide assembly structure, and the sliding direction is along the axial direction of the transmission shaft. The end of the power take-off sleeve is a toothed end capable of docking and meshing with the power shaft of the gearbox; The pushing assembly is sleeved on the outside of the power take-off sleeve and can slide relative to the housing to push the power take-off sleeve to move axially outward. The pushing assembly and the housing together form a closed space. The shell is provided with an air charging port communicating with the enclosed space.

2. The power take-off device according to claim 1, characterized in that: The pushing assembly includes a moving fork and a sealing sleeve; The movable fork is located in the housing and is sleeved on the outside of the power take-off sleeve. One side of the movable fork close to the toothed end of the power take-off sleeve is in clearance fit with the housing and is sealed, and the other side is spaced apart from the inner wall of the housing and is used to push the power take-off sleeve. The sealing sleeve is arranged between the movable fork and the inner wall of the housing and is sealed with both.

3. The power take-off device according to claim 2, characterized in that: The pushing assembly further includes a movable sleeve and a first sealing ring; An annular flange is provided on one side of the movable fork close to the toothed end of the power take-off sleeve; A first sealing groove is provided on the annular flange; The notches of the first sealing grooves are located on the circumferential side surfaces and end surfaces of the annular flange; The first sealing ring is arranged in the first sealing groove; The movable sliding sleeve is fixed on the movable fork and abuts against the first sealing ring.

4. The power take-off device according to claim 2, characterized in that: The inner surface of the movable fork is provided with a pushing protrusion; The power take-off sleeve is provided with an accommodating groove for accommodating the end of the pushing protrusion.

5. The power take-off device according to claim 1, characterized in that: Also included is a first clasp; The first clamping ring is disposed in a first clamping groove on the inner wall of the housing and protrudes out of the first clamping groove, and is used to limit the movement of the pushing component toward the external transmission connecting piece.

6. The power take-off device according to claim 1, characterized in that: A first sealing gasket is provided on one end surface of the housing adjacent to the toothed end of the power take-off sleeve; the housing is sealed and connected to the gear box via the first sealing gasket.

7. The power take-off device according to claim 1, characterized in that: The external transmission connection piece includes an output flange, a flange gasket, flange bolts and a fourth sealing ring; The output flange is a flange with a neck, the neck of which is sleeved on the outside of the transmission shaft, and the end of the neck is located between the housing and the transmission shaft, and is sealed to the housing through an oil seal on the housing; The output flange has an accommodating groove at its center. The flange gasket is located in the accommodating groove and is sealed to the side wall of the accommodating groove via the fourth sealing ring; The flange bolt passes through the flange gasket and is screwed to the transmission shaft.

8. The power take-off device according to claim 1, characterized in that: Also included is an elastic member; The elastic member is positioned between the housing and the pushing assembly.

9. The power take-off device according to claim 1, characterized in that: A bushing or a bearing is sleeved on one side of the transmission shaft adjacent to the toothed end of the power take-off sleeve.

10. An electric drive system, characterized in that: A power take-off device and a gearbox comprising any one of claims 1 to 9; The power take-off sleeve of the power take-off device is butted and meshed with the power shaft of the gear box.

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