CN105703540B

CN105703540B - Liquid cooling type in-wheel motor and motor vehicle

Info

Publication number: CN105703540B
Application number: CN201410683334.3A
Authority: CN
Inventors: 黄超; 西维奥·赞姆泽; 蔡向阳; 樊晓旭
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Technologies AG and Co KG
Priority date: 2014-11-24
Filing date: 2014-11-24
Publication date: 2020-09-01
Anticipated expiration: 2034-11-24
Also published as: CN105703540A

Abstract

The utility model provides a liquid cooling type in-wheel motor and motor vehicle, liquid cooling type in-wheel motor includes the casing, the coolant jacket, motor and gland, the coaxial setting of coolant jacket is in the casing, the coaxial setting of motor is in the coolant jacket, the gland sets up the side of casing to compress tightly from the axial the coolant jacket with be provided with first sealing washer and second sealing washer between the casing, with the coolant jacket and the coolant cavity is constituteed to the casing, first sealing washer and second sealing washer quilt the coolant jacket and the casing is upwards compressed tightly from the axial. The axially arranged sealing ring is more convenient for sealing control and production assembly, and the radial size precision control requirements of the shell and the cooling liquid sleeve and the possibility of damage in the production process are reduced.

Description

Liquid cooling type in-wheel motor and motor vehicle

Technical Field

The invention relates to an in-wheel motor of a motor vehicle, in particular to a liquid-cooling type in-wheel motor, and also relates to a motor vehicle adopting the in-wheel motor.

Background

The wheel hub motor technology is also called wheel built-in motor technology, and is a technology that the motor for driving the automobile is arranged inside the wheel rim and outside the wheel hub, and the wheel hub motor technology is characterized in that power, transmission and braking devices are all integrated into the wheel hub, so that the mechanical part of the electric vehicle is greatly simplified. In a general four-wheel automobile, a hub motor is respectively arranged in four wheels, and due to limited space, heat generated in the operation of the motor is difficult to dissipate by itself, and a special cooling system is needed for matching. Liquid cooling systems are more commonly used because they have higher heat dissipation efficiency than air cooling systems.

As shown in fig. 1, a cooling fluid jacket 2 is axially fixed to a hub motor housing 1 by a bolt 4 through a radially protruding fixing portion, and two

seal rings

3 and 5 are respectively located at two ends of an outer wall of the cooling fluid jacket 2 and used for sealing cooling fluid. Through the size fit, the

sealing rings

3 and 5 are compressed by the motor shell 1 and the cooling liquid sleeve 2, and the sealing effect is generated by radial pressure compression deformation. In addition, a sealing ring 6 is arranged on the side surface of the outer end of the motor coolant jacket and used for sealing the whole cavity of the hub motor and preventing outside water from flowing into the motor. It is pressed tightly on the side of the cooling liquid jacket 2 by the gland 7, and the sealing effect is achieved by the axial pressing force.

The compression deformation of the

sealing rings

3 and 5 is generally more than 60% to be qualified sealing, so that the sealing rings need to have enough pressure to ensure compaction and qualified sealing. The sealing ring of the hub motor system is arranged in a radial sealing mode and is pressed by radial pressure, so that the sealing ring can be controlled only by the size of the cooling water jacket and the sealing surface of the hub motor shell, and the size change caused by thermal expansion easily causes the leakage of the sealing ring due to the large influence of the change of the peripheral temperature.

Secondly, because the sealing ring is arranged in a radial sealing manner, the cooling water jacket 2 is installed by being pressed into the hub motor housing 1 from the outside of the housing (to the right in fig. 1). The

seal rings

3 and 5 provided on the cooling water jacket 2 are easily scratched or displaced by the housing 1 during installation, resulting in seal failure and leakage.

Therefore, it is desirable to provide a liquid-cooled in-wheel motor having an improved coolant sealing structure to solve the above problems.

Disclosure of Invention

The invention solves the problems that the sealing ring of the liquid cooling system of the hub motor has unstable effect, is greatly influenced by the environment and has overhigh damage risk in the installation process.

In order to solve the problems, the invention provides a liquid-cooled in-wheel motor which comprises a shell, a cooling liquid sleeve, a motor and a gland, wherein the cooling liquid sleeve is coaxially arranged in the shell, the motor is coaxially arranged in the cooling liquid sleeve, the gland is arranged on the side surface of the shell and axially compresses the cooling liquid sleeve, a first sealing ring and a second sealing ring are arranged between the cooling liquid sleeve and the shell, a cooling liquid cavity is formed by the first sealing ring, the cooling liquid sleeve and the shell, and the first sealing ring and the second sealing ring are axially compressed by the cooling liquid sleeve and the shell.

Optionally, the cooling fluid jacket has a radially outward protruding fixing portion for fixed connection with the housing, and the second seal ring is disposed between the fixing portion and the housing.

Optionally, the cooling fluid jacket is completely disposed inside the casing and compressed by the gland, the cooling fluid jacket has a first radially outward protruding portion on a side close to the gland, the casing is provided with a first concave portion matched with the first protruding portion at a corresponding position, and the second sealing ring is disposed between the first protruding portion and the first concave portion.

Optionally, the first sealing ring is disposed between an end of the coolant jacket on the distal gland side and the housing.

Optionally, the coolant jacket has a radially inward third protrusion on a distal pressure cover side, the third protrusion is axially located between the housing and the motor, and the first seal ring is disposed between the third protrusion and the housing.

Optionally, the cooling fluid jacket has a second concave portion facing radially inward on the distal pressure cover side, the housing has a second convex portion matching the second concave portion at a corresponding position, and the first seal ring is disposed between the second concave portion and the second convex portion.

Optionally, an axial distance between the first sealing ring and the second sealing ring is set according to an axial length of the motor.

Optionally, the cooling fluid jacket or the casing is provided with a groove with an axial opening at a position where the sealing ring is arranged, so as to fix the sealing ring.

Meanwhile, the invention also provides a motor vehicle using the liquid-cooled hub motor as claimed in any one of the preceding claims.

Compared with the prior art, the invention has the following advantages: the compression deformation direction of the sealing ring is axial, the compression deformation direction can be controlled axially, the axial direction is consistent with the installation direction of the hub motor, the radial dimensions of the shell and the cooling liquid sleeve do not need to be controlled accurately, and the influence of thermal expansion on the sealing ring is also greatly reduced; meanwhile, the sealing ring is fixed on the axial side face of the cooling liquid sleeve in advance, so that the cooling liquid sleeve is not damaged or displaced due to the fact that the sealing ring is scratched by the shell in the installation process, loss in the production and assembly process is reduced, and the requirement for controlling the accuracy degree is met.

Drawings

FIG. 1 is a cross-sectional view of a prior art liquid-cooled in-wheel motor;

FIG. 2 is a cross-sectional view of a first embodiment of the liquid-cooled in-wheel motor of the present invention;

FIG. 3 is an enlarged view of the coolant jacket in the in-wheel motor shown in FIG. 2;

fig. 4 is a schematic view of a second embodiment of the liquid-cooled in-wheel motor of the present invention;

fig. 5 is a schematic view of a third embodiment of the liquid-cooled in-wheel motor of the present invention;

fig. 6 is a schematic view of a fourth embodiment of the liquid-cooled in-wheel motor according to the present invention.

Detailed Description

A first embodiment of the invention is shown in figures 2 and 3.

As shown in fig. 2, the liquid-cooled in-wheel motor of the present invention includes a housing 1, a coolant jacket 2 disposed in the housing and having a radially protruding fixing portion, a motor 8 disposed inside the coolant jacket 2, a first seal ring 3 and a second seal ring 5 disposed between the housing 1 and the coolant jacket 2, a bolt 4 for being axially tightened at the fixing portion to fix the coolant jacket 2 and the housing 1, a cover plate 7 disposed on an axial side of the housing 1 and the coolant jacket 2 and fixed to the housing 1 by the bolt, and a circumferential third seal ring 6 disposed between the coolant jacket 2 and the cover plate 7. The first sealing ring 3 is arranged on the innermost side (the leftmost side in the drawing) of the cooling liquid sleeve 2, the shell 1 and the cooling liquid sleeve 2 are clamped in the axial direction, the second sealing ring 5 is arranged on the fixing portion, the shell 1 and the fixing portion of the cooling liquid sleeve 2 are pressed in the axial direction, and a cooling liquid cavity is formed between the first sealing ring 3 and the second sealing ring 5.

As shown in fig. 3, axially open recesses 2.1, 2.2 and 2.3 are provided at the location of the sealing rings on the coolant jacket 2, into which the

sealing rings

3, 5 and 6 can be inserted in order to further increase the positioning of the

sealing rings

3, 5 and 6 before and during the installation of the coolant jacket 2. Grooves of the same function can also be provided at corresponding positions on the housing 1.

A second embodiment of the invention is shown in fig. 4, and differs from the first embodiment in that the coolant jacket 2 is not fixed to the housing 1 by bolts, nor has radially projecting fixing portions, and the coolant jacket 2 is mounted entirely inside the housing 1 and is axially compressed by the same cover plate 7 as in the first embodiment, thereby being fixed. The cooling liquid jacket 2 is provided with a first radial outward protruding part on the side close to the cover plate in the axial direction, the shell is provided with a first radial concave part at the corresponding position to be matched with the first protruding part, and the second sealing ring 5 is arranged between the first protruding part and the first concave part and is axially compressed by the first protruding part and the first concave part.

A third embodiment of the present invention is shown in fig. 5, and is different from the second embodiment in that the coolant jacket 2 has a third protrusion facing radially inward on the far cover plate side, the third protrusion is axially located between the motor 8 and the housing 1, and the first seal ring 3 is disposed between the third protrusion and the housing 1, and is compressed by the third protrusion and the housing 1 in the axial direction, so that a larger coolant cavity can be formed than in the second embodiment, and the heat dissipation effect of the motor 8 can be further improved from the outside on both the radial and axial sides.

A fourth embodiment of the invention is shown in fig. 6, and differs from the second embodiment in that the coolant jacket 2 has a second recess facing radially inwards on the far-cover side, the housing 1 has a second projection facing radially inwards at a corresponding location, and the first sealing ring 3 is arranged between the second recess and the second projection and is compressed axially. The position of the first sealing ring 3 is determined by the axial distance between the second concave part and the first convex part, and the width of the cooling liquid cavity can be selected according to the size of the motor 8.

In the hub motor, the positions of the sealing rings are not limited to the four embodiments, the positions of the first sealing ring and the second sealing ring can be any combination of different settings in the four embodiments, and the cooling liquid jacket and the shell are correspondingly set according to different positions of the sealing rings.

In the wheel hub motor, the positions of the sealing rings are all arranged between the axial positions of the cooling liquid sleeve and the shell, so that the sealing effect can be achieved by axially pressing the cooling liquid sleeve and the shell, the influence of the thermal expansion of the cooling liquid sleeve and the shell can be greatly reduced, and the requirement on the size control accuracy of the cooling liquid sleeve and the shell is also greatly reduced. In addition, because the positions of the sealing rings are all arranged on the axial side of the cooling liquid jacket, no friction is generated with an external shell in the installation process, and the influences of displacement, scraping abrasion and the like in the installation process can be eliminated.

While the present invention has been described with respect to certain exemplary embodiments, these descriptions should be taken only by way of example and not by way of limitation. Various changes may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A liquid cooling type wheel hub motor comprises a shell (1), a cooling liquid sleeve (2), a motor (8) and a gland (7), the cooling liquid sleeve (2) is coaxially arranged in the shell (1), the motor (8) is coaxially arranged in the cooling liquid sleeve (2), the gland (7) is arranged on the side surface of the shell (1) and compresses the cooling liquid sleeve (2) from the axial direction, it is characterized in that a first sealing ring (3) and a second sealing ring (5) are arranged between the cooling liquid jacket (2) and the shell (1), the first sealing ring (3) and the second sealing ring (5), the cooling liquid jacket (2) and the shell (1) form a cooling liquid cavity, the first sealing ring (3) and the second sealing ring (5) are pressed by the cooling liquid sleeve (2) and the shell (1) from the axial direction; the cooling liquid sleeve (2) is provided with a radially outward-protruding fixing part for fixedly connecting with the shell (1), and the second sealing ring (5) is arranged between the fixing part and the shell (1); the cooling liquid jacket (2) is provided with a second inward concave part at the far pressing cover side, the shell (1) is provided with a second convex part matched with the second concave part at a corresponding position, and the first sealing ring (3) is arranged between the second concave part and the second convex part.

2. The liquid-cooled in-wheel motor according to claim 1, wherein: the axial distance between the first sealing ring (3) and the second sealing ring (5) is set according to the axial length of the motor (8).

3. The liquid-cooled in-wheel motor according to any one of claims 1 to 2, wherein: the cooling liquid sleeve (2) or the shell (1) is provided with a groove with an axial opening at the position where the sealing ring is arranged, and the groove is used for being embedded into the sealing ring to be fixed.

4. A motor vehicle, characterized in that a liquid-cooled in-wheel motor according to any of the preceding claims is used.