JP2001330111A - Lubricating device for power transmission for electric vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate machining for a lubricating oil passage, and to efficiently supply a sufficient lubricating oil to a portion requiring the oil. SOLUTION: The lubricating oil delivered from a pump is supplied to a gear housing chamber 35 for a differential mechanism 19, is supplied to a needle type radial bearing 33 from the chamber 35 through a radial-directional passage 45 of a carrier 31, an axial-directional passage 46 and a radial-directional passage 47 of a pinion supporting shaft 30, and is supplied to an engaging part engaged with the carrier 31, a cover 34 and rotary shafts 20, 21 through axial- directional passages 49, 61 of the rotary shafts 20, 21 and their radial-directional passages 49, 62. Spiral grooves 63, 64 for conducting pumping action to return the supplied lubricating oil to the reservoir 35 are provided in the engaging part among the carrier 31, the cover 34 and the rotary shafts 20, 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating device for a power transmission device for an electric vehicle.

[0002]

2. Description of the Related Art As a power transmission device for an electric vehicle, as described in JP-A-8-240254, power is transmitted from a rotating shaft of an electric motor to a pair of rotating shafts by a planetary gear type reduction mechanism and an umbrella. The transmission mechanism is configured to transmit the gears sequentially through a gear-type differential mechanism, and the gear receiving chamber of the differential mechanism is formed by a carrier that is an output member of the reduction mechanism and a cover that is integrally coupled to the carrier. What has been known is.

[0003]

In the above conventional apparatus, the lubricating oil is supplied by a pump to a fitting portion between one of the pair of rotating shafts and the cover, and the lubricating oil supplied to the fitting portion is supplied to the fitting portion. From the fitting portion, an oblique passage provided in the cover,
The axial passage and the radial passage provided in the carrier, the axial passage and the radial passage provided in the pinion support shaft are sequentially supplied to the pinion bearing, and the radial passage and the axial passage provided in the one rotating shaft are supplied. The lubricating oil supplied to the housing chamber is sequentially passed through the housing chamber, and the lubricating oil supplied to the housing chamber is passed through the axial passage and the radial passage provided in the other rotation shaft from the housing chamber, and a fitting portion between the other rotation shaft and the motor output shaft It is configured to supply to.

However, since the cover is provided with the oblique passage, there is a concern that a problem such as breakage of a drill may occur at the time of machining the oblique passage, and it is necessary to form an axial passage and a radial passage in the cover. There is a problem that the processing cost increases.

An object of the present invention is to solve the above problem.

[0006]

According to the invention of this application, power is transmitted from a rotating shaft of an electric motor to a pair of rotating shafts by a difference between a planetary gear type reduction mechanism and a bevel gear type. The transmission mechanism is configured to transmit power sequentially through a moving mechanism unit, and the gear receiving chamber of the differential mechanism unit is formed by a carrier which is an output member of the speed reduction mechanism unit and a cover integrally coupled to the carrier. In the forced lubrication device of the power transmission device for automobiles,
The pair of rotating shafts, the carrier and the cover are fitted so as to be rotatable relative to each other, lubricating oil is supplied by a pump to the storage chamber through a passage provided in the cover, and the lubricating oil supplied to the storage chamber is stored in the storage chamber. From the chamber, the radial passage provided in the carrier and the axial passage and the radial passage provided in the pinion support shaft are sequentially supplied to the pinion bearing, and the axial passage and the radius provided in each of the pair of rotating shafts. A lubricating device for a power transmission device for an electric vehicle, wherein the lubricating device is configured to supply the power to a fitting portion between the pair of rotating shafts and the carrier and the cover through a directional passage sequentially.

In this configuration, since there is no oblique passage in the passage of the lubricating oil and the number thereof is small, the processing cost for forming the passage is reduced.

In addition, as described in claim 2, a spiral groove having one end communicating with the accommodation chamber and the other end closed is provided at a fitting portion between the pair of rotating shafts and the carrier and the cover. Thereby, leakage of the lubricating oil supplied to the fitting portion can be suppressed.

[0009]

1 is a longitudinal sectional view of an upper half of a power transmission device for an electric vehicle. FIG. 2 is a vertical cross section of the differential mechanism section, which is a cross section shifted by 90 degrees from the cross section of FIG.
The fixed case 11 of the power transmission device 10 for an electric vehicle includes:
Also serves as the frame of the left electric motor 12. Electric motor 12
Are a stator core 13 fixed to the case 11 within the case 11, an exciting coil 14 fixed to the stator core 13, and a rotor core 1 located on the inner diameter side of the stator core.
5 and a hollow rotary shaft 16 that rotates integrally with the rotor core 15
Are the main components. The hollow rotary shaft 16 is supported on the case 11 via a ball type radial bearing 17. The power of the hollow rotary shaft 16 is transmitted to a pair of rotary shafts 20 and 21 coaxially arranged via a planetary gear type reduction mechanism 18 and a bevel gear type differential mechanism 19 in order. The rotating shaft 20 is rotatably connected to one of the left and right driving wheels, and the rotating shaft 21 is rotatably connected to one of the left and right driving wheels.

The speed reducing mechanism 18 is connected to the hollow rotary shaft 16 and is integrated with the hollow rotary shaft 16 in the first row sun gear 2.
2, a first row ring gear 23 connected and fixed to the case 11, a first row pinion 24 meshing with the sun gear 22 and the ring gear 23, and a first row in which both ends of a pinion support shaft 25 of the pinion 24 are fixed. Carrier 26,
A second row sun gear 27 connected so as to rotate integrally with the first row carrier 26, a second row ring gear 28 connected and fixed to the case 11, a second row pinion 29 meshing with the sun gear 27 and the ring gear 28; The main components are a second row carrier 31 to which both ends of a pinion support shaft 30 of the pinion 29 are fixed. Pinion 2
4 is supported on a pinion support shaft 25 via a needle type radial bearing 32 which is a pinion bearing using a needle, and the pinion 24 is supported on a pinion support shaft 30 via a needle type radial bearing 33 which is a pinion bearing. . Note that a washer-type thrust bearing is interposed between both ends of the pinion 24 and the carrier 26, and a washer-type thrust bearing is interposed between both ends of the pinion 29 and the carrier 26.

The differential gear mechanism 19 is installed in a storage chamber 35 formed by a second row carrier 31 of the speed reduction mechanism 18 and a cover 34 integrally connected thereto, and a pair of rotating shafts 20 is provided. , 21 and a pair of pinions 39, 40 supported by a support shaft 38 having both ends fixed to the carrier 31 and engaged with the side gears 36, 37 as main components. . The cover 34 is a ball type radial bearing 41
And is supported by the case 11 via the. The rotating shafts 20 and 21 are fitted to the carrier 31 and the cover 34 so as to be relatively rotatable.

The carrier 31 has a pump driving gear 42.
Is fixed, and lubricating oil discharged from a pump (not shown) driven through the gear 42 is supplied through an unillustrated passage provided in the case 11 to an annular passage 43 provided on the outer periphery of the right end of the cover 34. Supplied to Annular passage 43
Is supplied to the storage chamber 35 through an axial passage 44 provided in the cover 34. Accommodation room 35
Is supplied to an axial passage 46 provided in the pinion support shaft 30 through a radial passage 45 provided in the carrier 31, and is supplied from the axial passage 46 to a radial direction provided in the pinion support shaft 30. It is supplied to the needle type radial bearing 33 through the passage 47.

The rotating shafts 20 and 21 are fitted to the carrier 31 and the cover 34 so as to be relatively rotatable. The rotating shaft 20 has an axial passage 48 and radial passages 49, 5,
The lubricating oil supplied to the storage chamber 35 is supplied to the fitting portion between the rotating shaft 20 and the carrier 31 through the axial passage 48 and the radial passage 49. Through a radial passage 50, it is supplied to a tubular axial passage 52 defined between the outer periphery of the rotating shaft 20 and the inner periphery of the hollow rotating shaft 16. The lubricating oil supplied to the tubular axial passage 52 is supplied to a ball-type radial bearing 53 interposed between the outer periphery of the left end of the hollow rotary shaft 16 and the carrier 26,
The needle-type radial bearing 54 interposed between the carrier 26 and the carrier 31 and the needle-type thrust bearing 55 interposed between the sun gear 27 and the carrier 31 are also supplied to the carrier 26. Radial passage 57 and axial passage 58 provided in pinion support shaft 25
To the needle type radial bearing 32 through the radial passage 59 in order, and further through the radial passage 56 provided in the hollow rotary shaft 16 to the ball type radial bearing 17.
And a ball-type radial bearing 60 interposed between the carrier 26 and the case 11, and the hollow rotary shaft 16
Is supplied to a ball-type radial bearing (not shown) that supports the left end of the case 11 on the case 11.

The rotating shaft 21 is provided with an axial passage 61 and a radial passage 62, and the lubricating oil supplied to the storage chamber 35 passes through the axial passage 61 and the radial passage 62 to cover the rotating shaft 21 and the cover. 34. A spiral groove 63 having one end communicating with the accommodation chamber 35 and the other end closed is provided at a fitting portion of the cover 34 with the rotating shaft 21. A spiral groove 64 having one end communicating with the accommodation chamber 35 and the other end closed is also provided at the fitting portion of the carrier 31 with the rotating shaft 20. The spiral groove 63 functions as a pump that returns the lubricating oil supplied to the fitting portion between the rotating shaft 21 and the cover 34 to the housing chamber 35 by the relative rotation between the rotating shaft 21 and the cover 34. The spiral groove 64 allows the lubricating oil supplied to the fitting portion between the rotating shaft 21 and the carrier 31 to transfer the lubricating oil to the rotating shaft 21 and the carrier 31.
A pump action of returning to the storage chamber 35 by the relative rotation of.
Thereby, the annular passage 43 and the axial passage 44
The lubricating oil supplied to the storage chamber 35 through the storage chamber 35
Thus, the lubricating oil is efficiently supplied to the radial passage 45 of the carrier 31, the axial passage of the rotating shaft 20, and the axial passage of the rotating shaft 21, and sufficient lubricating oil is supplied to a portion requiring lubricating oil.

As is apparent from FIG. 1, the lubricating oil passage extends in the axial or radial direction, such as the axial passage 44 and the radial passage 45 of the carrier 31, so that the mechanical passage is provided. Drill breakage during processing is very small.

[0016]

As described above, the lubricating device for a power transmission device for an electric vehicle according to the invention of this application has no oblique passages in the passage of the lubricating oil and has a small number of passages. The cost can be reduced, and sufficient lubricating oil can be efficiently supplied to the parts requiring lubricating oil.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an upper half of a power transmission device for an electric vehicle according to the invention of this application.

FIG. 2 is a longitudinal sectional view of a differential mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Power transmission device for electric vehicles 11 ... Case 12 ... Electric motor 15 ... Rotor core 16 ... Hollow rotating shaft 18 ... Reduction mechanism part 19 ... Differential mechanism part 20, 21 ... Rotating shaft 31 ... Carrier 34 ... Cover 43 ... Circular passage 44,46,48,61 ... Axial passage 45,47,49,62 ... Radial passage 63,64 ... Spiral grooves

Continued on the front page (72) Inventor Katsuhiro Tsuchiya 2-1-1 Asahi-cho, Kariya-shi, Aichi F-term (reference) in Aisin Seiki Co., Ltd. 3J027 FA23 FA50 FB02 GB06 GB10 GC13 GC24 GC26 GD04 GD08 GD12 GE01 GE05 HB07 HB12 HC07 3J063 AA04 AB12 AB13 AC11 BA01 BA11 CA01 CA05 CB02 CB06 CB41 CB48 CD02 CD67 XA37 XD03 XD23 XD25 XD42 XD43 XD73 XE15 XE22

Claims (2)

[Claims] The power transmission device is configured to transmit power from a rotation shaft of an electric motor to a pair of rotation shafts coaxially arranged through a planetary gear type reduction mechanism portion and a bevel gear type differential mechanism portion in order. In a forced lubrication device for a power transmission device for an electric vehicle, a housing for accommodating a gear of a dynamic mechanism unit is formed by a carrier serving as an output member of the speed reducing mechanism unit and a cover integrally connected to the carrier. And the carrier and the cover are fitted so as to be relatively rotatable, lubricating oil is supplied to the storage chamber by a pump through a passage provided in the cover, and the lubricating oil supplied to the storage chamber is supplied from the storage chamber to the carrier. The axial passage and the radial passage provided in the pair of rotary shafts are sequentially supplied to the pinion bearing through the radial passage provided in the pinion support shaft and the axial passage and the radial passage provided in the pinion support shaft. A lubricating device for a power transmission device for an electric vehicle, wherein the lubricating device is configured to supply the power to a fitting portion between the pair of rotary shafts, the carrier, and the cover via a pair. 2. A lubricating device for a power transmission device for an electric vehicle according to claim 1, wherein said fitting portion is provided with a spiral groove having one end communicating with said housing chamber and the other end closed. A lubricating device for a power transmission device for an electric vehicle.