Transmission device for electric drive axle and electric drive axle

Abstract

The utility model relates to a transmission device for an electric drive axle. The transmission device comprises a shell; the transmission shaft is mounted in the shell and is provided with a first end and a second end which are axially opposite to each other; the stressed component is arranged on the transmission shaft, and the stressed component bears axial force towards the first end in at least one working state; the bearing comprises a bearing inner ring and a bearing outer ring which can rotate relatively, the bearing inner ring is installed on the transmission shaft and located between the stressed component and the first end, and in the at least one working state, the bearing inner ring bears the axial force of the stressed component, and the bearing outer ring is located between the stressed component and the first end. The bearing outer ring is indirectly or directly supported on the shell and bears the axial force of the shell towards the second end; and the stop part is arranged on the transmission shaft and used for preventing the bearing inner ring from axially moving towards the first end. The utility model further relates to the electric drive axle. The transmission device has the advantages that the bearing inner ring can be assisted in resisting axial impact, so that the service life of the transmission device is prolonged.

Description

Technical Field

[0001] This application relates to a transmission device for an electric drive axle and an electric drive axle. Background Technology

[0002] Transmission devices for electric drive axles, particularly reducers, have drive shafts. The drive shaft is supported by bearings within the housing of the transmission device. The bearings include an inner ring mounted on the drive shaft with an interference fit and an outer ring mounted in the housing. The outer ring is additionally axially supported by the housing. In the prior art, based on the interference fit mounting of the inner ring and the axial support of the outer ring by the housing, the bearing is generally considered fixed without additional positioning measures. However, the applicant unexpectedly discovered that when a transmission component is located next to the bearing, the inner ring of the bearing can still shift due to the axial impact of the adjacent transmission component, leading to premature bearing failure. Utility Model Content

[0003] The purpose of this application is to provide a transmission device for an electric drive axle, which in particular helps to resist axial impacts on the inner ring of the bearing, thereby increasing the service life of the transmission device.

[0004] According to a first aspect of this application, a transmission device for an electric drive axle is provided, characterized in that the transmission device comprises:

[0005] case;

[0006] A drive shaft, which is installed inside the housing, and has a first end and a second end that are axially opposite each other;

[0007] The force-bearing component mounted on the drive shaft is subjected to an axial force toward the first end in at least one working state;

[0008] A bearing includes an inner ring and an outer ring that can rotate relative to each other. The inner ring is mounted on the drive shaft and located between the force-bearing component and the first end. In the at least one working state, the inner ring is subjected to the axial force of the force-bearing component, and the outer ring is indirectly or directly supported by the housing and subjected to the axial force of the housing toward the second end.

[0009] A stop portion is provided on the drive shaft, which prevents the inner ring of the bearing from moving axially toward the first end.

[0010] According to an optional embodiment of this application, the force-bearing component and the bearing inner ring are respectively fitted onto the transmission shaft from the first end to the second end. The transmission device includes a stop member, which includes a fixing part adapted to be fixedly mounted on the transmission shaft and includes the stop part. The fixing part carries the stop part.

[0011] According to an optional embodiment of this application, the stop portion and the fixing portion are integral; and / or, the fixing portion is fixedly mounted on the drive shaft in the form of a threaded connection or an interference fit; and / or, the stop portion is fixed to the end face or circumferential surface of the drive shaft.

[0012] According to an optional embodiment of this application, the stop member has a stud section as the fixing part, and the end face of the drive shaft is provided with an end face threaded hole suitable for installing the stud section; the stop member has a flange section that extends radially beyond the end face of the drive shaft, and the flange section forms the stop part; the bearing inner ring extends axially beyond the end face of the drive shaft or is flush with the end face of the drive shaft axially; the stop member has an axial through hole that communicates with the central oil passage hole of the drive shaft; the stop member has a sealing section on the side of the flange section opposite to the stud section, the sealing section is provided with a sealing ring groove suitable for installing a sealing ring, and the sealing section and the housing achieve radial sealing through the sealing ring; the diameter of the sealing section is smaller than the diameter of the end face of the drive shaft.

[0013] According to an optional embodiment of this application, the drive shaft has a first mounting section suitable for mounting the inner ring of the bearing and a second mounting section with external threads that is axially adjacent to the first mounting section at a first end, the diameter of the second mounting section being less than or equal to that of the first mounting section, and the stop member having a stop member threaded hole suitable for mounting in the second mounting section as the fixing part.

[0014] According to an optional embodiment of this application, the stop is a retaining pin or a retaining ring, and the circumferential surface of the drive shaft is provided with a mounting groove suitable for installing the retaining pin or the retaining ring.

[0015] According to an optional embodiment of this application, the drive shaft has a protrusion integral with the drive shaft, the protrusion forming the stop portion.

[0016] According to an optional embodiment of this application, the force-bearing component is a helical gear adapted to be mounted on the drive shaft; the helical gear is axially adjacent to the inner ring of the bearing in the mounted state.

[0017] According to an optional embodiment of this application, in at least one operating state, there are radial force components and axial force components between the inner ring and the outer ring of the bearing; and / or, the bearing is a tapered roller bearing and includes tapered rollers as rolling elements; and / or, the outer ring of the bearing is supported on the housing via a washer; and / or, the inner ring of the bearing is interference-fitted with the drive shaft; and / or, the housing has an oil supply channel for supplying oil to the central oil passage of the drive shaft; and / or, the transmission device is a speed reducer; and / or, the drive shaft is a shift shaft equipped with multiple shift gears; and / or, the stop portion abuts against the inner ring of the bearing.

[0018] According to a second aspect of this application, an electric drive axle is provided, characterized in that the electric drive axle includes a motor and the aforementioned transmission device for the electric drive axle capable of being connected to the motor.

[0019] At least in some embodiments, the positive effects of this application are: it can help the inner ring of the bearing resist axial impact, thereby improving the life of the transmission device; the structure is simple and the bearing is easy to install. Attached Figure Description

[0020] The principles, features, and advantages of this application will be better understood below with reference to the accompanying drawings. The drawings include:

[0021] Figure 1 An example of the electric drive bridge of this application is illustrated schematically.

[0022] Figure 2 An example of a transmission device is illustrated schematically.

[0023] Figure 3 An example of the area of ​​the drive shaft and bearings is shown in a close-up view.

[0024] Figure 4 An example of a drive shaft, bearing, and stop is shown schematically in a partially enlarged view.

[0025] Figure 5 Shown separately under magnification Figure 4 The stop component in the middle.

[0026] Figure 6 A second example of a stop is illustrated schematically.

[0027] Figure 7 A third example of a stop is illustrated schematically.

[0028] Figure 8 The fourth example of the stop is illustrated schematically.

[0029] Figure 9Another example of a stop is shown schematically. Detailed Implementation

[0030] To make the technical problems to be solved, the technical solutions, and the beneficial technical effects of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and several exemplary embodiments. It should be understood that the specific embodiments described herein are only for explaining this application and are not intended to limit the scope of protection of this application.

[0031] Figure 1 An example of the electric drive axle of this application is schematically illustrated. The electric drive axle includes a motor 2 and a transmission device 1 of this application. Exemplarily, the transmission device 1 acts on an axle 3. Wheels 4 are mounted on the axle 3. Here, Figure 1 This should be understood by way of example, and not as an absolute limitation of this application.

[0032] The transmission device 1 is particularly a speed reducer. In some cases, the electric drive axle or the transmission device 1 may also include a differential.

[0033] Figure 2 An example of the transmission device 1 is shown schematically.

[0034] The transmission device 1 includes a housing 11, a drive shaft 12, and a bearing 13. The drive shaft 12 is mounted inside the housing 11 and has a first end 128 and a second end 129 that are axially opposed. The drive shaft 12 is, in particular, the shift shaft of a reducer.

[0035] Figure 3 An example of the area of ​​the drive shaft 12 and bearing 13 is shown schematically in a partial enlarged view.

[0036] like Figure 2 and Figure 3 As shown, the transmission device 1 includes a force-receiving component 14 mounted on the transmission shaft 12. In at least one working state, the force-receiving component 14 is subjected to an axial force toward the first end 128.

[0037] like Figure 3 As shown, the bearing 13 includes an inner bearing ring 130 and an outer bearing ring 132 that are rotatable relative to each other. The inner bearing ring 130 is mounted on the drive shaft 12 and located between the force-bearing component 14 and the first end 128. In at least one operating state, the inner bearing ring 130 is subjected to the axial force of the force-bearing component 14, and the outer bearing ring 132 is indirectly or directly supported by the housing 11 and subjected to the axial force of the housing 11 toward the second end 129. In at least one operating state, there are radial force components and axial force components between the inner bearing ring 130 and the outer bearing ring 132.

[0038] For example, such as Figure 2 and Figure 3 As shown, the bearing 13 is a tapered roller bearing and includes tapered rollers as rolling elements 131. The inner ring 130 of the bearing is particularly interference-fitted with the drive shaft 12.

[0039] The load-bearing component 14 will exert an axial impact on the inner ring 130 of the bearing due to the axial force it receives. Due to the axial impact on the inner ring 130 of the bearing, the bearing 13 and the transmission device 1 may fail prematurely.

[0040] Figure 4 An example of a drive shaft 12, bearing 13, and stop 15 is schematically shown in a partially enlarged view. In this application, the transmission device 1 includes a stop 15 disposed on the drive shaft 12, which prevents the inner ring 130 of the bearing from moving axially toward the first end 128. The stop 15 effectively prevents bearing 13 failure.

[0041] The stop portion 15 can in particular abut against the inner ring 130 of the bearing or have a small gap with the inner ring 130 of the bearing.

[0042] exist Figure 3 In this example, the force-bearing component 14 is a helical gear adapted to be mounted on the drive shaft 12. The helical gear, in its mounted state, is axially abutted against the inner ring 130 of the bearing. The force-bearing component 14 can also be other force-bearing components 14 that may be subjected to axial forces, such as a bevel gear.

[0043] For example, the force-bearing component 14 and the bearing inner ring 130 are respectively mounted on the drive shaft 12 from the first end 128 to the second end 129.

[0044] According to an exemplary embodiment of this application, such as Figure 4 As shown, the transmission device 1 includes a stop member 5, which includes a fixing portion 50 adapted to be fixedly mounted on the transmission shaft 12 and includes the stop portion 15, the fixing portion 50 carrying the stop portion 15. By designing the stop member 5, it is possible to install the stop member 5 after the bearing 13 is mounted on the transmission shaft 12, thereby facilitating the installation of the bearing 13 while simultaneously implementing the stop portion 15. The fixing portion 50, in particular, directly carries or indirectly carries the stop portion 15 via a transition portion 58.

[0045] like Figure 4 As shown, the stop portion 15 can be integral with the fixing portion 50. This facilitates manufacturing. Theoretically, it is also possible for the stop portion 15 to be independent of the fixing portion 50 and to be fixed to the fixing portion 50.

[0046] like Figure 4 As shown, the fixing part 50 is fixedly mounted to the drive shaft 12 by a threaded connection. Alternatively, it is conceivable that the fixing part 50 is fixedly mounted to the drive shaft 12 by an interference fit.

[0047] exist Figure 4 In this example, the stop 5 is fixed to the end face 122 of the drive shaft 12.

[0048] Figure 5 Shown separately under magnification Figure 4 Stop component 5 in the middle.

[0049] See Figure 4 and Figure 5 For example, the stop member 5 has a stud section 51 as the fixing part 50. Figure 4 and Figure 5 The stop component 5 can also be called the shaft end bolt.

[0050] Correspondingly, see Figure 3 The end face 122 of the drive shaft 12 is provided with an end face threaded hole 120 suitable for installing the stud section 51.

[0051] In order to enable direct stopping via the stop portion 15, the bearing inner ring 130 can extend axially beyond the end face 122 of the drive shaft 12 (see...). Figure 3 Alternatively, it can be flush with the end face 122 of the drive shaft 12 along the axial direction.

[0052] To stop the blockage, such as Figure 4 and Figure 5 As shown, the stop member 5 has a flange section 52 that extends radially beyond the end face 122 of the drive shaft 12, and the flange section 52 forms the stop portion 15.

[0053] To avoid stress concentration and increase strength, such as Figure 5 As shown, the transition from stud section 51 to flange section 52 can have an arc-shaped transition portion 58. Alternatively, an angled transition portion 58 may also be conceived. Corresponding to the transition portion 58, see [link to relevant documentation]. Figure 3 The end face threaded hole 120 can also have a corresponding transition area 1200.

[0054] like Figure 2 and Figure 3 As shown, the drive shaft 12 has a central oil passage 121. The drive shaft 12 also has radial branch holes 123 communicating with the central oil passage 121 to supply lubricating oil to various transmission components mounted on the drive shaft 12, particularly the shift gear 19. The housing 11 may have an oil supply channel 110 for supplying oil to the central oil passage 121 of the drive shaft 12.

[0055] In order to achieve oil transportation, such as Figure 4 and Figure 5 As shown, the stop member 5 has an axial through hole 57, which is connected to the central oil passage hole 121 of the transmission shaft 12.

[0056] In addition, such as Figure 4 and Figure 5 As shown, the stop member 5 may have a sealing section 6 located on the side of the flange section 52 opposite to the stud section 51. The sealing section 6 is provided with a sealing ring groove 60 suitable for installing a sealing ring. The sealing section 6 and the housing 11 achieve radial sealing via the sealing ring. See also Figure 2 The housing 11 here specifically has a groove for receiving the sealing section 6. The oil delivery passage 110 of the housing 11 communicates with the groove.

[0057] In addition, see, for example Figure 4 The diameter of the sealing section 6 is smaller than the diameter of the end face 122 of the drive shaft 12. This saves costs and facilitates sealing.

[0058] Figure 6 A second example of stop 5 is shown schematically.

[0059] Here, by way of example, the drive shaft 12 has a first mounting section 124 adapted to mount the bearing inner ring 130 and a second mounting section 125 with external threads that is axially adjacent to the first mounting section 124 near a first end 128. The diameter of the second mounting section 125 is smaller than that of the first mounting section 124, and the stop member 5 has a stop member threaded hole 55 adapted to be mounted in the second mounting section 125 as the fixing part 50. Figure 6 The stop part 5 can be regarded as a nut or bolt.

[0060] exist Figure 6 In this case, the diameter of the stop end face 59 of the stop member 5 facing the inner ring 130 of the bearing is larger than the diameter of the first mounting section 124 of the drive shaft 12, so that the stop end face 59 of the stop member 5 can form a stop portion 15 for the inner ring 130 of the bearing.

[0061] like Figure 6 As shown, the drive shaft 12 may also include a sealing section 6. The diameter of the sealing section 6 may be smaller than the diameter of the second mounting section 125 of the drive shaft 12. The sealing section 6 is axially adjacent to the second mounting section 125.

[0062] Figure 7 A third example of stop 5 is shown schematically.

[0063] and Figure 6Similarly, the drive shaft 12 has a first mounting section 124 adapted for mounting the bearing inner ring 130 and a second, externally threaded mounting section 125 axially adjacent to the first mounting section 124 near a first end 128. Figure 6 Unlike the first mounting section 124, the diameter of the second mounting section 125 is equal. Figure 7 The stop member 5 also has a stop member threaded hole 55 suitable for installation in the second mounting section 125 as the fixing part 50. Figure 7 The drive shaft 12 also has a sealing section 6. The diameter of the sealing section 6 can be smaller than the diameter of the first mounting section 124 or the second mounting section 125.

[0064] Figure 6 and Figure 7 The example can be understood as: the stop 5 is fixed to the circumferential surface of the drive shaft 12.

[0065] Figure 8 The fourth example of the stop 5 is illustrated schematically.

[0066] Here, the stop 5 is a retaining pin 56, and the circumferential surface of the drive shaft 12 is provided with a mounting groove 126 suitable for installing the retaining pin 56. Alternatively, it is conceivable that the stop 5 is a retaining ring, and the circumferential surface of the drive shaft 12 is provided, for example, with an annular mounting groove 126.

[0067] Figure 9 Another example of the stop 15 is shown schematically.

[0068] Instead of the stop 5, the drive shaft 12 may have a protrusion 127 integral with the drive shaft 12, the protrusion 127 forming the stop 15. The integral protrusion 127 can be understood as being integrally formed or formed into one piece by means such as welding.

[0069] The dimensions, quantity, position, shape, and interrelationships of the elements in the accompanying drawings should be understood as examples, not as absolute limitations of this application. Those skilled in the art can also conceive of simple variations in the dimensions, quantity, position, shape, and interrelationships of these elements without departing from the scope of protection of this application.

[0070] In the accompanying drawings, there are multiple elements that have the same function. Sometimes only some of them are labeled as examples, but those skilled in the art can identify the other elements that have the same function without any doubt by the similarity between the shapes of these elements.

[0071] In some of the accompanying drawings, certain elements and the gaps between components are shown in an exaggerated manner for clarity.

[0072] Provided that it is permissible in principle, each of the cited features can be considered as an individual feature and can be combined with any other feature in any form without departing from the scope of protection of this application. If it is permissible in principle, even if not explicitly stated, a feature described for one embodiment should be considered as being arbitrarily applicable to other embodiments.

[0073] Although specific embodiments of this application are described in detail herein, they are given for illustrative purposes only and should not be construed as limiting the scope of this application. Various substitutions, modifications, and alterations can be conceived without departing from the spirit and scope of this application.

[0074] List of reference numerals

[0075] 1. Transmission device

[0076] 11. Shell

[0077] 110 oil transfer channel

[0078] 12 drive shafts

[0079] 120 end face threaded hole

[0080] 1200 transition zone

[0081] 121 Center Oil Through Hole

[0082] 122 end face

[0083] 123 Radial Branch Hole

[0084] 124 First Installation Section

[0085] 125 Second Installation Section

[0086] 126 mounting slot

[0087] 127 protrusion

[0088] 128 First End

[0089] 129 Second End

[0090] 13 bearings

[0091] 130 bearing inner ring

[0092] 131 Rolling Body

[0093] 132 bearing outer ring

[0094] 14 load-bearing components

[0095] 15 Stop section

[0096] 19-speed gear

[0097] 2 motors

[0098] 3 axles

[0099] 4 wheels

[0100] 5 stop components

[0101] 50 fixed part

[0102] 51 stud section

[0103] 52 flange segments

[0104] 55 Stop Threaded Hole

[0105] 56 card pin

[0106] 57 Axial Through Hole

[0107] 58 Transition Section

[0108] 59 Stop end face

[0109] 6 sealing sections

[0110] 60 sealing ring groove

Claims

1. A transmission device for an electric drive axle, characterized in that, The transmission device (1) includes: Shell (11); A drive shaft (12) is installed inside the housing (11) and has a first end (128) and a second end (129) that are axially opposite each other. The force-receiving component (14) mounted on the drive shaft (12) is subjected to an axial force toward the first end (128) in at least one working state; The bearing (13) includes an inner bearing ring (130) and an outer bearing ring (132) that are rotatable relative to each other. The inner bearing ring (130) is mounted on the drive shaft (12) and located between the force-bearing component (14) and the first end (128). In the at least one working state, the inner bearing ring (130) is subjected to the axial force of the force-bearing component (14), and the outer bearing ring (132) is indirectly or directly supported by the housing (11) and subjected to the axial force of the housing (11) toward the second end (129). A stop (15) is provided on the transmission shaft (12), the stop (15) preventing the inner ring (130) of the bearing from moving axially toward the first end (128).

2. The transmission device for an electric drive axle according to claim 1, characterized in that, The force-bearing component (14) and the bearing inner ring (130) are respectively fitted onto the transmission shaft (12) from the first end (128) to the second end (129). The transmission device (1) includes a stop member (5). The stop member (5) includes a fixing part (50) adapted to be fixedly mounted on the transmission shaft (12) and includes the stop part (15). The fixing part (50) carries the stop part (15).

3. The transmission device for an electric drive axle according to claim 2, characterized in that, The stop (15) and the fixing part (50) are integral; and / or The fixing part (50) is fixedly mounted to the drive shaft (12) by means of a threaded connection or an interference fit; and / or The stop (5) is fixed to the end face (122) or circumferential surface of the transmission shaft (12).

4. The transmission device for an electric drive axle according to claim 2, characterized in that, The stop member (5) has a stud section (51) as the fixing part (50), and the end face (122) of the transmission shaft (12) is provided with an end face threaded hole (120) suitable for installing the stud section (51); The stop member (5) has a flange section (52) that extends radially beyond the end face (122) of the drive shaft (12), and the flange section (52) forms the stop portion (15); The bearing inner ring (130) extends axially beyond the end face (122) of the drive shaft (12) or is flush with the end face (122) of the drive shaft (12) in the axial direction; The stop (5) has an axial through hole (57), which is connected to the central oil hole (121) of the drive shaft (12); The stop member (5) has a sealing section (6) on the side of the flange section (52) opposite to the stud section (51), the sealing section (6) is provided with a sealing ring groove (60) suitable for installing a sealing ring, and the sealing section (6) and the housing (11) are radially sealed via the sealing ring. The diameter of the sealing section (6) is smaller than the diameter of the end face (122) of the drive shaft (12).

5. The transmission device for an electric drive axle according to claim 2, characterized in that, The drive shaft (12) has a first mounting section (124) suitable for mounting the bearing inner ring (130) and a second mounting section (125) with external threads that is axially adjacent to the first mounting section (124) near a first end (128), the diameter of the second mounting section (125) being less than or equal to that of the first mounting section (124), and the stop (5) has a stop threaded hole (55) suitable for mounting in the second mounting section (125) as the fixing part (50).

6. The transmission device for an electric drive axle according to claim 2, characterized in that, The stop (5) is a retaining pin (56) or a retaining ring, and the circumferential surface of the drive shaft (12) is provided with a mounting groove (126) suitable for installing the retaining pin (56) or the retaining ring.

7. The transmission device for an electric drive axle according to claim 1, characterized in that, The drive shaft (12) has a protrusion (127) integral with the drive shaft (12), and the protrusion (127) forms the stop (15).

8. The transmission device for an electric drive axle according to any one of claims 1 to 7, characterized in that, The force-bearing component (14) is a helical gear suitable for mounting on the transmission shaft (12); The helical gear is axially adjacent to the inner ring (130) of the bearing in the installed state.

9. The transmission device for an electric drive axle according to any one of claims 1 to 7, characterized in that, In at least one of the operating states, there is a radial force component and an axial force component between the inner ring (130) and the outer ring (132) of the bearing; and / or The bearing (13) is a tapered roller bearing and includes tapered rollers as rolling elements (131); and / or The outer ring of the bearing (132) is supported on the housing (11) via a gasket; and / or The bearing inner ring (130) is interference-fitted with the drive shaft (12); and / or The housing (11) has an oil supply channel (110) for supplying oil to the central oil passage (121) of the drive shaft (12); and / or The transmission device (1) is a speed reducer; and / or The drive shaft (12) is a shift shaft equipped with multiple shift gears (19); and / or The stop portion (15) abuts against the inner ring (130) of the bearing.

10. An electric drive bridge, characterized in that, The electric drive axle includes a motor (2) and a transmission device for the electric drive axle according to any one of claims 1 to 9, which can be connected to the motor (2).

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