CN116557478A - Planetary gear reducer and vehicle driving device - Google Patents

Abstract

The application proposes a planetary gear reducer and vehicle drive arrangement, planetary gear reducer includes casing (1), casing (1) defines at least part and the exhaust chamber (12) of reduction gear chamber (11), exhaust chamber (12) are located the radial outside in reduction gear chamber (11), casing (1) is provided with first hole (14) and second hole (15), first hole (14) with second hole (15) make reduction gear chamber (11) with exhaust chamber (12) communicate under the state that planetary gear reducer is installed the vehicle, the position of first hole (14) is higher than the position of second hole (15).

Description

Planetary gear reducer and vehicle driving device

Technical Field

The application belongs to the field of vehicle driving mechanisms, and particularly relates to a planetary gear reducer and a vehicle driving device.

Background

The power assembly of the electric automobile or the hybrid electric automobile comprises a speed reducer and a motor, and the speed reducer and the motor have the characteristics of miniaturization and high transmission power, so that the requirement on lubricating oil cooling is very high. Meanwhile, the running speed of the power assembly is very high, and the sealing requirement is very high, so that the cleaning degree of lubricating oil is very high.

For a planetary gear reducer, the lubricating oil forms oil rings distributed outside the cavity of the reducer under the action of centrifugal force, and has certain pressure. Automatic gearboxes can use an oil pump to circulate oil for cooling, but require additional cooling system power (oil pump) and are costly.

Chinese patent application CN107882970a discloses a planetary gearbox with exhaust holes in the axial location of the gearbox. Due to its low vent position, there may be a problem of insufficient protection level, for example, when the vehicle is wading.

Disclosure of Invention

The application aims to provide a planetary gear reducer, so that the heat dissipation efficiency of the planetary gear reducer is higher.

The present application proposes a planetary gear reducer comprising a housing defining at least a portion of a reducer cavity and at least a portion of a vent cavity, said vent cavity being located radially outside said reducer cavity,

the housing is provided with a first aperture and a second aperture, the first aperture and the second aperture communicating the retarder chamber and the exhaust chamber,

the first hole is located higher than the second hole in a state where the planetary gear reducer is mounted to a vehicle.

In at least one embodiment, a filter member capable of filtering impurities in oil is provided in the exhaust chamber, and the filter member is located between the first hole and the second hole in the circumferential direction of the planetary gear reducer.

In at least one embodiment, when the planetary gear reducer is operated at a high speed, the oil in the reducer chamber forms an oil ring, and the first hole is located radially outward of the oil ring.

In at least one embodiment, the vent chamber is provided with a third aperture that communicates the vent chamber with the exterior of the housing.

In at least one embodiment, the third aperture is located higher than the first aperture and the second aperture.

In at least one embodiment, the exhaust chamber is provided with an oil blocking portion located between the first hole and the third hole in the circumferential direction of the planetary gear reducer.

In at least one embodiment, the first hole is located between the second hole and the third hole in a circumferential direction of the planetary gear reducer.

In at least one embodiment, the portion of the exhaust chamber between the first and second apertures corresponds to a central angle of less than 180 degrees.

In at least one embodiment, the exhaust cavity is an arc-shaped section extending along the circumferential direction of the shell, and the central angle corresponding to the arc-shaped section is greater than 90 degrees.

The application also proposes a vehicle drive device comprising a planetary gear reducer according to any one of the above-mentioned technical solutions.

Through adopting above-mentioned technical scheme, utilize the pressure differential in reduction gear chamber and exhaust chamber, do not use the oil pump to provide extra power can make fluid circulation flow between two chambeies to realize better radiating effect.

Drawings

Fig. 1 shows a cross-sectional view of a vehicle drive device according to an embodiment of the present application.

Fig. 2 shows a schematic structural view of a vehicle driving device according to an embodiment of the present application.

Fig. 3 shows a cross-sectional view along line D-D in fig. 2.

Fig. 4 shows a cross-sectional view along line E-E in fig. 2.

Fig. 5 shows a cross-sectional view along line F-F in fig. 2.

Fig. 6 shows a schematic structural view of a housing of a vehicle drive device according to an embodiment of the present application.

Description of the reference numerals

1 the shell 11 the speed reducer cavity 12 the exhaust cavity 13 the third hole 14 the first hole 15 the second hole 16 the oil baffle 17 the oil cavity

2 gear set 21 planetary gear

3 exhaust cavity cover

Aaxial Rradial Ccircumferential.

Detailed Description

To more clearly illustrate the above objects, features and advantages of the present application, specific embodiments of the present application are described in detail in this section in conjunction with the accompanying drawings. The present application can be embodied in other different forms besides the embodiments described in this section, and those skilled in the art may make corresponding modifications, variations, and substitutions without departing from the spirit of the application, so that the application is not limited to the specific examples disclosed in this section. The protection scope of the present application shall be subject to the claims.

In the following description, if not specifically explained, the circumferential direction C refers to the circumferential direction of the vehicle drive device/speed reducer, the radial direction R refers to the radial direction of the vehicle drive device/speed reducer, and the axial direction a refers to the axial direction of the vehicle drive device/speed reducer. The circumferential direction of the vehicle driving device/speed reducer is consistent with the circumferential direction of the shell of the vehicle driving device/speed reducer and the planetary gear set, the radial direction of the vehicle driving device/speed reducer is consistent with the radial direction of the shell of the vehicle driving device/speed reducer and the planetary gear set, and the axial direction of the vehicle driving device/speed reducer is consistent with the axial direction of the shell of the vehicle driving device/speed reducer and the planetary gear set.

Referring to fig. 1 to 6, the present invention provides a planetary gear reducer and a vehicle driving device including the planetary gear reducer and a motor. The vehicle drive may be, for example, a hub drive. In the vehicle driving device, the motor and the planetary gear reducer may be coaxially arranged, and the planetary gear reducer may output power of the motor to wheels. The vehicle including the vehicle driving device may be a pure electric vehicle or a hybrid vehicle.

The motor and planetary gear reducer are enclosed within a housing of the vehicle drive. Hereinafter, the planetary gear reducer portion will be mainly described, and therefore, the housing of the vehicle drive device or a part of the housing of the vehicle drive device will also be referred to as a housing of the planetary gear reducer. It will be appreciated that the housing 1 of the planetary gear reducer is not limited to being used only to house a planetary gear reducer.

The planetary gear reducer may include a housing 1, a gear set 2, and an exhaust chamber cover 3.

A speed reducer chamber 11 is formed at one side (left side in fig. 1) in the axial direction of the housing 1, and an exhaust chamber 12 is formed at the other side (right side in fig. 1) in the axial direction of the housing 1, the speed reducer chamber 11 and the exhaust chamber 12 being partitioned by the housing 1. The opening of the decelerator chamber 11 may be directed to one side in the axial direction (left side of fig. 1), and the opening of the exhaust chamber 12 may be directed to the other side in the axial direction (right side of fig. 1).

It will be appreciated that the housing 1 herein having a decelerator chamber 11 and a vent chamber 12 is not necessarily limited to the housing 1 itself defining the entire decelerator chamber 11 or the entire vent chamber 12, but may also be at least a portion of the housing 1 defining the decelerator chamber 11 or at least a portion of the vent chamber 12. For example, referring to FIG. 1, the housing 1 may define a reducer chamber 11 with other components such as a cover plate or hub, and the housing 1 may define an exhaust chamber 12 with the bulkhead 3, etc.

It will be appreciated that the axial face shape of the housing 1 may be curved. Although the decelerator chamber 11 is located on the left side of the housing 1 and the exhaust chamber 12 is located on the right side of the housing 1 in fig. 1, this does not limit the relative positional relationship of the decelerator chamber 11 and the exhaust chamber 12, and for example, a part of the decelerator chamber 11 may be located on the right side of the exhaust chamber 12 in an axial sectional view as in fig. 1.

The exhaust chamber cover 3 is connected to the opening of the exhaust chamber 12 and closes the opening of the exhaust chamber 12, and the exhaust chamber cover 3 may be connected to the housing 1 by welding, clamping, screwing, or the like. A seal may be provided between the vent chamber cover 3 and the opening of the vent chamber 12 to prevent oil within the vent chamber 12 from leaking from the gap between the opening and the vent chamber cover 3.

Lubricating oil is mainly stored in the reducer housing 11, which can be used for lubrication of the gear set 2. Gear set 2 may include a planetary gear set including a sun gear, a ring gear, planet gears 21, and a carrier. When the retarder is stationary or running at low speed, the lubrication oil collects under the influence of gravity in the bottom of the retarder chamber 11, which may be over part of the components of the gear set 2. When the speed reducer runs at high speed, the lubricating oil can be driven by the gear set 2 to form an oil liquid ring in the speed reducer cavity 11 under the action of centrifugal force.

As shown in fig. 1 and 3 to 5, the exhaust chamber 12 is located radially outside the speed reducer chamber 11. The bottom of the reducer chamber 11 or the casing 1 may have an oil chamber 17, the oil chamber 17 communicating with the reducer chamber 11, the radial position of the oil chamber 17 being accessible to the radial position of the exhaust chamber 12.

As shown in fig. 2 and 6, when the housing 1 is viewed along the axial direction a, the exhaust chamber 12 forms approximately an arc segment of a semicircular arc, and the central angle corresponding to the arc segment is greater than 90 degrees. In a state where the planetary gear reducer is mounted to the vehicle, the exhaust chamber 12 may extend from the bottom to the top of the housing 1 in the circumferential direction C, and the housing 1 may be "C" -shaped when viewed in the axial direction a. When the retarder is stationary or operating at low speed, a portion of the exhaust chamber 12 is below the surface of the oil.

As shown in fig. 2 to 6, the exhaust chamber 12 is provided with a first hole 14, a second hole 15, and a third hole 13. In a state where the planetary gear reducer is mounted to the vehicle, the position of the first hole 14 is higher than the position of the second hole 15, and the position of the third hole 13 is higher than the position of the first hole 14.

When viewed from the right side in fig. 1 to the left in the axial direction a, referring to fig. 6, oil can flow in the clockwise direction in the speed reducer chamber 11, and after entering the exhaust chamber 12 through the first hole 14, the oil flows downward in the counterclockwise direction.

As shown in fig. 4 and 6, the exhaust chamber 12 is provided with an oil blocking portion 16, and the oil blocking portion 16 is located between the second hole 14 and the third hole 13 in the circumferential direction C. The oil baffle 16 can prevent oil entering the exhaust chamber 12 from being thrown to the third hole 13 under the inertia effect and leaking out of the housing 1. Alternatively, the oil baffle 16 may be an L-shaped rib or rib in cross section, and the oil entering the discharge chamber 12 is thrown onto the oil baffle 16 by inertia and then falls down due to the loss of pressure.

As shown in fig. 4, the first hole 14 communicates the exhaust chamber 12 and the decelerator chamber 11, and the first hole 14 may extend in the radial direction R.

It will be appreciated that when the reducer is operating at high speed, even if a complete, closed oil ring is not formed, the lubrication oil can flow from the reducer housing 11 to the exhaust housing 12 via the first holes 14, as long as the gear set 2 (the planet gears and the planet carrier) can carry the lubrication oil to a level above the first holes 14 in the reducer housing 11. Thus, the height of the first bore 14 is related to the design rotational speed of the gear set 2 (the planet gears and the planet carrier), and the height of the first bore 14 may be lower if the design rotational speed of the gear set 2 is lower, and the height of the first bore 14 may be higher if the design rotational speed of the gear set 2 is higher.

As shown in fig. 5, the second hole 15 communicates the exhaust chamber 12 and the speed reducer chamber 11, the second hole 15 may extend in the axial direction a, the second hole 15 may communicate directly to the speed reducer chamber 11, or the second hole 15 may communicate not directly to the speed reducer chamber 11 but to the oil chamber 17 at the bottom of the housing 1. The second holes 15 may be adjacent to a radially inner portion of the exhaust chamber 12.

The position of the second bore 15 is below the level of the oil when the retarder is stationary or running at low speed. When the reducer is operating at high speed, the first holes 14 are located radially outside the oil ring.

As shown in fig. 3, the third hole 13 may be located at a radially outer side wall portion of the exhaust chamber 12, allowing the exhaust chamber 12 to communicate with the outside of the housing 1. The third hole 13 may be located at the top of the exhaust chamber 12. A vent valve or vent plug may be installed in the third bore 13.

As shown in fig. 6, when the housing 1 is viewed in the axial direction a, the first hole 14 and the second hole 15 may be located on the same side in the left-right direction in fig. 6, and an angle between a line connecting the first hole 14 and the axis of the planetary gear reducer and a line connecting the second hole 15 and the axis of the planetary gear reducer may be smaller than 180 degrees. The circulation path of the oil through the first hole 14 and the second hole 15 does not cross the axis of the planetary gear reducer, and the oil circulates on one side (left side in fig. 6) in the left-right direction of the casing 1.

A filter element may also be provided in the exhaust chamber 12, which filter element is located between the first and second holes 14, 15 in the circumferential direction C, and is capable of filtering solid impurities, such as metal filings, in the oil. The filter element may be adjacent to the second aperture 15.

It is understood that the lubricating oil contains metal shavings due to gear mesh. When the speed reducer is operated at a high speed, the lubricating oil of the speed reducer chamber 11 enters the exhaust chamber 12 through the first hole 14 under pressure (centrifugal force). Since there is no pressure in the exhaust chamber 12, the lubricating oil containing metal filings flows downwards and is filtered by the filter element, and the cleaned lubricating oil after filtration enters the reducer chamber again from the second hole 15. The lubricating oil is pressurized in the retarder chamber 11 and not in the exhaust chamber 12, and the lubricating oil can circulate between the retarder chamber 11 and the exhaust chamber 12 via the first hole 14 and the second hole 15. Under the condition that no pump is used for providing additional power, a good heat dissipation effect can be achieved through lubricating oil circulation, and cost is saved. And in the circulating flow process of the lubricating oil, the filtering piece is used for filtering the lubricating oil, so that impurities such as metal scraps can be filtered out, and the cleanness and purity of the oil are maintained.

When the retarder is stationary or running at low speed, the rotational speed of the gear set 2 (the planet gears and the planet carrier) is low and lubrication oil can be mainly stored in the bottom of the retarder chamber 11. The high temperature expansion air in the retarder chamber 11 may enter the exhaust chamber 12 through the first holes 14 and exit the housing 1 through the third holes 13.

When the reducer runs at high speed, the rotational speed of the gear set 2 (the planet gears and the planet carrier) is high, and the lubricating oil forms an oil ring distributed in the reducer chamber 11 under the centrifugal force and has a certain pressure. Lubricating oil containing metal chips is forced under pressure from the first holes 14 into the exhaust chamber 12. The exhaust chamber 12 is not pressurized so that the lubricating oil can flow downwards and, after filtration through the filter element, clean lubricating oil can flow back from the second holes 15 to the retarder chamber 11. The high temperature expansion air in the retarder chamber 11 may enter the exhaust chamber 12 through the first holes 14 and exit the housing 1 through the third holes 13.

This application need not to use the oil pump to provide power, just can make lubricating oil circulate between reduction gear room 11 and exhaust chamber 12 to utilize the circulation of lubricating oil to cool off casing 1, improve radiating efficiency, and can filter the cleanness through the filter in the course of circulation to the impurity in the lubricating oil.

While the present application has been described in detail using the above embodiments, it will be apparent to those skilled in the art that the present application is not limited to the embodiments described in the present specification. The present application can be modified and implemented as a modified embodiment without departing from the spirit and scope of the present application as defined by the claims. Accordingly, the descriptions in this specification are for purposes of illustration and are not intended to be limiting in any way.

Claims (10)

1. A planetary gear reducer characterized in that it comprises a housing (1), said housing (1) defining at least a portion of a reducer cavity (11) and at least a portion of an exhaust cavity (12), said exhaust cavity (12) being located radially outside said reducer cavity (11),

the housing (1) is provided with a first hole (14) and a second hole (15), the first hole (14) and the second hole (15) communicate the speed reducer chamber (11) with the exhaust chamber (12),

the first hole (14) is located higher than the second hole (15) in a state where the planetary gear reducer is mounted to a vehicle.

2. A planetary gear reducer according to claim 1, characterized in that a filter element capable of filtering impurities in oil is provided in the exhaust chamber (12), said filter element being located between the first hole (14) and the second hole (15) in the circumferential direction (C) of the planetary gear reducer.

3. A planetary gear reducer according to claim 1, characterized in that when the planetary gear reducer is operated at high speed, the oil in the reducer chamber (11) forms an oil ring, and the first holes (14) are located radially outside the oil ring.

4. A planetary gear reducer according to claim 1, characterized in that the exhaust chamber (12) is provided with a third hole (13), the third hole (13) putting the exhaust chamber (12) in communication with the outside of the housing (1).

5. A planetary gear reducer according to claim 4, characterized in that the position of the third hole (13) is higher than the position of the first hole (14) and the position of the second hole (15).

6. A planetary gear reducer according to claim 4, characterized in that the exhaust chamber (12) is provided with an oil baffle (16), the oil baffle (16) being located between the first hole (14) and the third hole (13) in the circumferential direction (C) of the planetary gear reducer.

7. A planetary gear reducer according to claim 4, characterized in that the first hole (14) is located between the second hole (15) and the third hole (13) in the circumferential direction (C) of the planetary gear reducer.

8. A planetary gear reducer according to claim 1, characterized in that the portion of the exhaust chamber (12) located between the first hole (14) and the second hole (15) corresponds to a central angle of less than 180 degrees.

9. A planetary gear reducer according to claim 1, characterized in that the exhaust chamber (12) is an arc-shaped section extending in the circumferential direction (C) of the housing (1), the arc-shaped section corresponding to a central angle greater than 90 degrees.

10. A vehicle drive device, characterized in that it comprises the planetary gear reducer according to any one of claims 1 to 9.