CN217814868U

CN217814868U - Speed reducer shell, speed reducer and power assembly for electric vehicle

Info

Publication number: CN217814868U
Application number: CN202221515342.3U
Authority: CN
Inventors: 王敏珠; 张申
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2022-06-15
Filing date: 2022-06-15
Publication date: 2022-11-15
Anticipated expiration: 2032-06-15

Abstract

The utility model provides a reducer case, wherein, reducer case is equipped with: a baffle structure that partitions an internal space defined by the decelerator housing into a deceleration chamber adapted to arrange the deceleration part and a ventilation chamber communicating with the deceleration chamber, and a ventilation hole that penetrates the decelerator housing and opens into the ventilation chamber, wherein the baffle structure includes first and second plates that are staggered with each other, wherein the first and second plates are arranged on one side of the ventilation hole with a spacing therebetween in a main normal direction defined by the first or second plates, wherein the first and second plates partially overlap each other as viewed along the main normal direction. A retarder and a power assembly for an electric vehicle are also presented. Through the utility model discloses for the reduction gear can be discharged effectively, and prevent that lubricating oil from gathering near the air vent or spilling through the air vent.

Description

Speed reducer shell, speed reducer and power assembly for electric vehicle

Technical Field

The utility model relates to an exhaust of reduction gear especially relates to a reduction gear casing, a reduction gear and a power component for electric vehicle.

Background

Retarders are very important components in industrial applications, especially in vehicles. Since there are many moving parts in the reduction gear and the rotational speed is high, the moving parts need to be lubricated with lubricating oil.

During the operation of the speed reducer, the moving parts rotate at high speed, the temperature inside the speed reducer rises, causing the expansion of the gas and the vaporization of the lubricating oil, so that the gas pressure inside the speed reducer rises. Excessive internal air pressure may break the sealability at the oil seal, resulting in oil leakage. Therefore, it is necessary to provide a vent hole in the reducer case to release high-pressure gas inside the reducer, thereby ensuring pressure balance between the inside and the outside of the reducer.

However, the high speed rotation of the moving parts will cause the oil to splash so that the oil may accumulate near or leak out through the vent holes. Particularly in an electric vehicle, a speed reducer is connected to a motor to reduce the rotation speed and increase the torque, and the rotation speed of a moving part of the speed reducer, such as a gear, is considerably high, and there is a problem that splashed lubricating oil accumulates in the vicinity of a vent hole or leaks through the vent hole more easily.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an improved reduction gear casing to make the reduction gear can exhaust effectively, and prevent that lubricating oil from gathering near the air vent or spilling through the air vent.

According to the utility model discloses an aspect provides a reduction gear casing, wherein, reduction gear casing is equipped with: a baffle structure that partitions an internal space defined by the decelerator housing into a deceleration chamber adapted to arrange the deceleration part and a ventilation chamber communicating with the deceleration chamber, and a ventilation hole that penetrates the decelerator housing and opens into the ventilation chamber, wherein the baffle structure includes first and second plates that are staggered with each other, wherein the first and second plates are arranged on one side of the ventilation hole with a spacing therebetween in a main normal direction defined by the first or second plates, wherein the first and second plates partially overlap each other as viewed in the main normal direction.

According to the utility model discloses an embodiment, the reduction gear casing is including enclosing jointly the first shell main part and the second shell main part of inner space, wherein: the first plate is arranged on the first shell main body and extends from the first shell main body to the second shell main body, and a first gap is formed between the free end of the first plate, which points to the second shell main body, and the second shell main body; the second plate is arranged on the second housing body and extends from the second housing body to the first housing body, and a second gap is formed between a free end of the second plate, which is directed to the first housing body, and the first housing body.

According to an embodiment of the invention, the first plate and the first shell body are formed as an integral casting; the second plate is formed as a one-piece casting with the second shell body.

According to an embodiment of the present invention, the vent hole is formed on the first case main body or the second case main body.

According to an embodiment of the invention, the one of the first plate and the second plate that is closer to the air vent is provided on the same one of the first case main body or the second case main body as the air vent.

According to an embodiment of the present invention, the lower end of the first plate and the first shell main body enclose a first groove, the first groove being inclined downward in a direction from the first shell main body to the second shell main body; the lower end of the second plate and the second case main body enclose a second groove, and the second groove is inclined downward in a direction from the second case main body to the first case main body.

According to the utility model discloses an embodiment, baffle structure still includes at least one of following: a third plate provided on the first case body and arranged such that the second plate extends between the first plate and the third plate; a fourth plate provided on the second case main body and arranged such that the first plate extends between the second plate and the fourth plate.

According to an embodiment of the invention, the first plate and the second plate are configured such that any radiation directed from the ventilation chamber to the deceleration chamber passes through at least one of the first plate and the second plate.

According to another aspect of the present invention, a speed reducer is provided, wherein the speed reducer comprises a speed reducer housing according to the present invention and a speed reduction part arranged in the speed reduction cavity of the speed reducer housing.

According to a further aspect of the present invention, a power assembly for an electric vehicle is provided, wherein the power assembly comprises a speed reducer according to the present invention and a motor, wherein an output shaft of the motor is configured to drive an input shaft of the speed reducer.

The utility model has the advantages of: the first plates and the second plates which are staggered form a shingled structure. This shingled configuration enables the first plate to effectively block splashed lubricating fluid with the second plate, while the channels between the spaced first and second plates allow gas to pass through. Therefore, during the operation of the speed reducer, the gas can flow from the speed reducing cavity to the ventilation cavity through the baffle plate structure and is exhausted through the ventilation hole, so that the pressure balance between the inside and the outside of the speed reducer shell is realized. Meanwhile, the lubricating oil splashed in the speed reduction chamber may be blocked by the first plate or the second plate. Therefore, it is possible to prevent the lubricating oil from accumulating in the vicinity of the vent hole or leaking out through the vent hole while achieving effective air discharge of the speed reducer.

Drawings

The principles, features and advantages of the present invention may be better understood by describing the invention in more detail below with reference to the accompanying drawings. The drawings comprise:

fig. 1 schematically shows a retarder according to an exemplary embodiment of the present invention;

FIG. 2 schematically illustratesbase:Sub>A partial cross-sectional view along section line A-A in FIG. 1;

fig. 3 schematically illustrates a first shell body of a reducer housing according to an exemplary embodiment of the present invention;

fig. 4 schematically illustrates a second shell body of a reducer housing according to an exemplary embodiment of the present invention; and

fig. 5A and 5B schematically illustrate partial views of a retarder housing according to further embodiments of the invention.

List of reference numerals

1. Speed reducer

10. Speed reducer casing

101. First shell main body

102. Second shell main body

11. Baffle structure

111. First plate

112. Second plate

113. Third plate

114. Fourth board

12. Speed reducing cavity

13. Ventilation cavity

14. Vent hole

15. First gap

16. Second gap

17. The first groove

18. Second groove

20. Speed reduction part

30. Vent valve

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and a plurality of exemplary embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the scope of the invention. In the drawings, other components and steps have been omitted for the sake of brevity, but this does not suggest that the reducer housing and reducer of the present invention may not include other components or modules.

Fig. 1 schematically shows a retarder 1 according to an exemplary embodiment of the invention. Fig. 2 schematically showsbase:Sub>A partial cross-sectional view along the section linebase:Sub>A-base:Sub>A in fig. 1.

The retarder 1 comprises a retarder housing 10 and a retarding element 20 arranged in the inner space of the retarder housing 10. The speed reduction part 20 includes, for example, a gear, a worm wheel, a worm, or the like. The speed reducer 1 is lubricated with lubricating oil.

As shown in fig. 1 and 2, the reducer case 10 is provided with a baffle structure 11. The baffle structure 11 divides an inner space defined by the decelerator housing 10 into a deceleration chamber 12 and a ventilation chamber 13. The reduction member 20 is disposed within the reduction chamber 12. The ventilation chamber 13 communicates with the deceleration chamber 12. The retarder housing 10 is further provided with a vent hole 14 which extends through the retarder housing 10 and opens into the vent chamber 13. The baffle structure 11 comprises first and

second plates

111, 112 interleaved with each other. As can be seen more clearly with reference to fig. 2, the first plate 111 and the second plate 112 are arranged spaced apart from each other on one side of the vent hole 14 in the main normal direction defined by the first plate 111 or the second plate 112. The first plate 111 and the second plate 112 partially overlap each other as viewed in the main normal direction. Here, the major normal direction defined by a certain plate may mean a normal direction of a maximum surface of a smallest parallelepiped just completely surrounding the plate. In fig. 2, the main normal direction defined by the first plate 111 is schematically shown in a chain line.

Thus, the first plates 111 and the second plates 112 interlaced with each other form a shingled structure. This shingled configuration enables the first plate 111 to effectively block splashed lubricating fluid with the second plate 112, while the channels between the spaced first and

second plates

111, 112 allow gas to pass through. Thus, during operation of the retarder 1, gas can flow from the retardation chamber 12 to the venting chamber 13 through the baffle structure 11 and be discharged via the venting holes 14, thereby achieving pressure equalization inside and outside the retarder housing 10. Meanwhile, the lubricating oil splashed in the speed reduction chamber 12 may be blocked by the first plate 111 or the second plate 112. Therefore, it is possible to prevent the lubricating oil from accumulating near the vent hole 14 or leaking out through the vent hole 14 while achieving effective exhaust of the reducer 1.

As shown by the broken line arrows in fig. 1, when the lubricating oil in the reduction chamber 12 is splashed in the direction of the breather chamber 13 due to, for example, the rotation of the gear, the lubricating oil is blocked by the first plate 111 in most cases. As can be seen in connection with fig. 2, even if the lubricant oil happens to pass by the first plate 111, it is blocked by the second plate 112. As shown by the dotted arrows in fig. 2, when the pressure in the deceleration chamber 12 rises, the gas in the deceleration chamber 12 may flow to the passage between the first plate 111 and the second plate 112 bypassing the first plate 111, and then flow to the ventilation chamber 13 bypassing the second plate 112. Finally, the gas can be vented via vent 14.

In addition, during the operation of the speed reducer 1, the temperature inside the speed reducer 1 increases, possibly causing the lubrication oil to gasify. The above-described baffle structure 11 allows a longer passage between the aeration chamber 13 and the deceleration chamber 12 to allow the passage of gas. During the flow through the longer passages, the vaporized lubricating oil is lowered in temperature and liquefied. This also helps to prevent leakage of the lubricating oil through the vent hole 14.

It is to be understood that, in the present context, "the venting chamber is in communication with the deceleration chamber" means that a gas or liquid is able to communicate between the venting chamber and the deceleration chamber.

Additionally, the retarder 1 may comprise a vent valve 30, said vent valve 30 being arranged above the vent hole 14 or in the vent hole 14.

The retarder 1 may for example be part of a power unit of an electric vehicle. Here, the electric vehicle means a vehicle that runs at least partially powered by an on-board battery and that drives wheels using a motor. The power assembly includes a motor (not shown in the drawings). The output shaft of the motor is configured to drive the input shaft of the speed reducer 1 to reduce the rotation speed and increase the torque with the speed reducer 1. The output shaft of the motor can reach a relatively high rotational speed. Accordingly, the input shaft of the speed reducer 1 and the speed reducing member 20 will also rotate at a high rotational speed. When the speed reduction part 20 is rotated at a high speed, a large degree of splashing of the lubricating oil may be caused, so that the amount of the splashed lubricating oil is larger and the splashing range of the lubricating oil is wider. Therefore, more lubricating oil may splash in the direction of the breather chamber 13. With the baffle structure 11 described above, the accumulation of the lubricating oil in the vicinity of the vent hole 14 can be effectively prevented.

Optionally, the first plate 111 and the second plate 112 are configured such that any (virtual) ray directed from the ventilation chamber 13 to the deceleration chamber 12 passes through at least one of the first plate 111 and the second plate 112. Therefore, no matter in which direction the lubricating oil is splashed, it is not directly splashed from the deceleration chamber 12 into the breather chamber 13.

As shown in fig. 2, the decelerator housing 10 may include a first housing body 101 and a second housing body 102. The first case main body 101 and the second case main body 102 are fixed to each other and together enclose an inner space of the gear case 10. The first plate 111 may be disposed on the first case body 101 and extend from the first case body 101 to the second case body 102, and a free end of the first plate 111 directed to the second case body 102 forms a first gap 15 with the second case body 102. The second plate 112 may be arranged on the second housing body 102 and extend from the second housing body 102 to the first housing body 101, a second interspace 16 being formed between a free end of the second plate 112 directed to the first housing body 101 and the first housing body 101. This configuration facilitates manufacturing and assembly. The vent chamber 13 may be formed on the first case body 101 or the second case body 102. In further embodiments, the first plate 111 and the second plate 112 may also be provided on the same case main body.

In the embodiment shown in fig. 2, the first plate 111 is formed in one piece with the first case main body 101, and the second plate 112 is formed in one piece with the second case main body 102. This can further simplify the manufacturing and assembly of the gear housing. In particular, the first plate 111 and the first case main body 101 may be formed as an integral piece by casting. Alternatively or additionally, the second plate 112 and the second shell body 102 may be formed as a cast, unitary piece. By the casting process, the integrated first plate 111 and first case body 101 and/or the integrated second plate 112 and second case body 102 can be simply and conveniently manufactured. However, the present invention is not limited thereto, and the first plate 111 may be fixed to the first case main body 101 by means of plug connection, welding, or adhesion. Similarly, the second plate 112 may be fixed to the second case main body 102 by means of plug connection, welding, or adhesion, or the like.

In an exemplary embodiment, one of the first plate 111 and the second plate 112 that is closer to the vent hole 14 is provided on the same one of the first case body 101 or the second case body 102 as the vent hole 14. Thereby, a longer passage can be formed between the ventilation chamber 13 and the deceleration chamber 12. This is advantageous to further prevent the lubricating oil from reaching the breather chamber 13.

Fig. 3 schematically shows a first shell body 101 of the reducer case 10 according to an exemplary embodiment of the present invention. As shown in fig. 3, the first case main body 101 is provided with the vent hole 14 and the first plate 111. The lower end of the first plate 111 encloses a first groove 17 with the first case main body 101. The first groove 17 may be inclined downward in a direction from the first case body 101 to the second case body 102. Thus, even if the lubricating oil is not blocked by the first plate 111 and enters the space on the side of the first plate 111 facing away from the speed reduction chamber 12, the lubricating oil can flow out along the first grooves 17 without accumulating there.

Fig. 4 schematically shows the second shell body 102 of the reducer case 10 according to an exemplary embodiment of the present invention. As shown in fig. 4, the second case main body 102 is provided with a second plate 112. The lower end of the second plate 112 encloses the second recess 18 with the second case main body 102. The second groove 18 may be inclined downward in a direction from the second case main body 102 toward the first case main body 101. Thereby, even if the lubricating oil is not blocked by the second plate 112 and enters the space on the side of the second plate 112 facing away from the speed reducing chamber 12, the lubricating oil can flow out along the second grooves 18 without accumulating there.

The first plate 111 and/or the second plate 112 may for example be provided with stiffening ribs for reinforcing the strength of the respective first plate 111 and/or second plate 112.

Fig. 5A and 5B schematically illustrate partial views of a retarder housing 10 according to further embodiments of the invention.

In the embodiment shown in fig. 5A, the baffle structure 11 includes, in addition to the first plate 111 and the second plate 112, a third plate 113 provided on the first case body 101 and arranged such that the second plate 112 extends between the first plate 111 and the third plate 113. This facilitates the formation of a longer passage between the ventilation chamber 13 and the deceleration chamber 12.

In the embodiment shown in fig. 5B, the baffle structure 11 includes, in addition to the first plate 111 and the second plate 112, a fourth plate 114 provided on the second case main body 102 and arranged such that the first plate 111 extends between the second plate 112 and the fourth plate 114. This also facilitates the formation of a longer passage between the ventilation chamber 13 and the deceleration chamber 12.

The baffle structure 11 may also comprise both a third plate 113 and a fourth plate 114.

Although specific embodiments of the invention have been described in detail herein, they have been presented for purposes of illustration only and are not to be construed as limiting the scope of the invention. Various substitutions, alterations, and modifications may be devised without departing from the spirit and scope of the present invention. In particular, features from different embodiments may be combined with each other.

Claims

1. A retarder housing (10), characterized in that the retarder housing (10) is provided with:

a baffle structure (11) dividing an inner space defined by the reducer case (10) into a reduction chamber (12) adapted to arrange a reduction member (20) and a ventilation chamber (13) communicating with the reduction chamber (12), and

a vent hole (14) that penetrates the reducer case (10) and opens into the vent chamber (13),

wherein the baffle structure (11) comprises a first plate (111) and a second plate (112) which are interleaved with each other, wherein the first plate (111) and the second plate (112) are arranged spaced apart from each other on one side of the vent hole (14) in a main normal direction defined by the first plate (111) or the second plate (112), wherein the first plate (111) and the second plate (112) partly overlap each other as seen in said main normal direction.

2. Retarder housing (10) according to claim 1,

the gear case (10) includes a first case main body (101) and a second case main body (102) that together enclose the internal space, wherein:

a first plate (111) is arranged on the first housing body (101) and extends from the first housing body (101) to the second housing body (102), a first interspace (15) being formed between a free end of the first plate (111) directed to the second housing body (102) and the second housing body (102);

a second plate (112) is arranged on the second housing body (102) and extends from the second housing body (102) to the first housing body (101), a second recess (16) being formed between a free end of the second plate (112) pointing towards the first housing body (101) and the first housing body (101).

3. Retarder housing (10) according to claim 2,

the first plate (111) is formed as a one-piece casting with the first shell body (101);

the second plate (112) is formed as a one-piece casting with the second shell body (102).

4. Retarder housing (10) according to claim 2 or 3,

the vent hole (14) is formed in the first case main body (101) or the second case main body (102).

5. Retarder housing (10) according to claim 2 or 3,

one of the first plate (111) and the second plate (112) that is closer to the vent hole (14) is provided on the same one of the first case main body (101) or the second case main body (102) as the vent hole (14).

6. Retarder housing (10) according to claim 2 or 3,

the lower end of the first plate (111) and the first case main body (101) enclose a first groove (17), and the first groove (17) is inclined downward in a direction from the first case main body (101) to the second case main body (102);

the lower end of the second plate (112) and the second case main body (102) enclose a second groove (18), and the second groove (18) is inclined downward in a direction from the second case main body (102) to the first case main body (101).

7. Retarder housing (10) according to claim 2 or 3,

the baffle structure (11) further comprises at least one of:

a third plate (113) provided on the first case body (101) and arranged such that the second plate (112) extends between the first plate (111) and the third plate (113);

a fourth plate (114) provided on the second case main body (102) and arranged such that the first plate (111) extends between the second plate (112) and the fourth plate (114).

8. Retarder housing (10) according to any of claims 1 to 3,

the first plate (111) and the second plate (112) are configured such that any ray directed from the ventilation chamber (13) to the deceleration chamber (12) passes through at least one of the first plate (111) and the second plate (112).

9. Retarder (1), characterized in that the retarder (1) comprises a retarder housing (10) according to any of claims 1-8 and a retarding element (20) arranged in a retarding cavity (12) of the retarder housing (10).

10. A power pack for an electric vehicle, characterized in that it comprises a retarder (1) according to claim 9 and an electric machine, wherein the output shaft of the electric machine is configured to drive the input shaft of the retarder (1).