CN107302288B

CN107302288B - Hub driver

Info

Publication number: CN107302288B
Application number: CN201610202345.4A
Authority: CN
Inventors: 黄超; 姜伟
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Technologies AG and Co KG
Priority date: 2016-04-01
Filing date: 2016-04-01
Publication date: 2022-02-25
Anticipated expiration: 2036-04-01
Also published as: CN107302288A

Abstract

A hub driver comprising: the wheel rim is internally provided with a shell, and the motor and the rotary transformer are positioned in the shell, wherein the motor is provided with a rotor bracket which is fixedly connected with a motor rotor, and the rotary transformer is provided with a rotary transformer stator and a rotary transformer rotor which are coaxially sleeved; the rotary transformer is arranged in the rotary space; the rotary transformer rotor is fixedly connected with the rotor support, and the rotary transformer stator is fixedly connected with the shell. The rotary transformer and the motor are respectively arranged in different spaces, and the existing arrangement mode of arranging the rotary transformer in the motor cavity is changed, so that the electromagnetic interference between the motor and the rotary transformer can be weakened or even eliminated, and the working performance of the hub driver is ensured.

Description

Hub driver

Technical Field

The invention relates to the field of automobiles, in particular to a hub driver.

Background

The wheel hub motor technology (also called wheel built-in motor technology) is characterized in that power, transmission and braking devices are integrated into a wheel hub, so that the mechanical part of an electric vehicle is greatly simplified. The power device adopts a hub driver, and the motor is directly installed in a wheel hub to form the hub driver.

For the hub driver, the rotor position of the motor is an indispensable parameter, so the rotor position detection sensor is an indispensable component, and the motor cannot normally operate without the rotor position detection sensor. The rotor position signal of the motor is typically detected and transmitted using a resolver (also called an angle sensor).

The rotary transformer is provided with a rotary transformer stator (stator winding) and a rotary transformer rotor (rotor winding), the working principle of the rotary transformer is the same as that of a common transformer, the rotary transformer stator is equivalent to a primary coil of the common transformer, the rotary transformer rotor is equivalent to a secondary coil, and the rotary transformer rotor can rotate relative to the rotary transformer stator.

A motor cavity for mounting a motor is arranged in an existing hub driver, a rotary transformer is arranged in the motor cavity, wherein a rotary transformer is fixed on a motor rotor, and a rotary transformer stator is fixed on a shell of the motor cavity. Such a hub driver has the following problems: the magnetic flux or other pulse signals generated by the resolver and the motor during operation cause electromagnetic interference with each other, which may cause the motor to send torque ripple or instability, thereby affecting the operating performance of the hub driver.

Disclosure of Invention

The invention solves the problem that the working performance of the hub driver is influenced by mutual electromagnetic interference between a motor and a rotary transformer in the conventional hub driver.

To solve the above problems, the present invention provides a hub driver including: the wheel rim is internally provided with a shell, and the motor and the rotary transformer are positioned in the shell, wherein the motor is provided with a rotor bracket which is fixedly connected with a motor rotor, and the rotary transformer is provided with a rotary transformer stator and a rotary transformer rotor which are coaxially sleeved; the rotary transformer is arranged in the rotary space; the rotary transformer rotor is fixedly connected with the rotor support, and the rotary transformer stator is fixedly connected with the shell.

Optionally, the rotary transformer further includes a rotary transformer bracket disposed at one axial side of the housing; the rotary transformer support is fixed on the rotor support, and the rotary transformer rotor is fixed on the rotary transformer support and is fixedly connected with the rotor support through the rotary transformer support.

Optionally, the rotating bracket has an annular body coaxial with the rim, and a flange located at the outer periphery of the annular body and extending axially towards the housing; the rotary space is enclosed by the rotary support and the shell, and the rotary rotor is fixed on the flange.

Optionally, the flange is annular and coaxial with the rim.

Optionally, the casing has a first extension portion extending toward the annular body in the axial direction on one side of the resolver bracket, the first extension portion being provided on an inner side of the flange in a radial direction of the rim, and the resolver being provided between the first extension portion and the flange in the radial direction; the rotor bracket is provided with a second extending part which extends towards the annular body along the axial direction, and the second extending part is arranged on the inner side of the first extending part along the radial direction; and a bearing is arranged between the first extension part and the second extension part.

Optionally, a first sealing ring is further disposed between the first extending portion and the second extending portion, and the first sealing ring is located between the bearing and the annular body along the axial direction.

Optionally, a second sealing ring is arranged between the flange and the housing.

Optionally, a brake located outside the housing, the brake having a brake rotor; the brake rotor is located on one side, back to the rotor support, of the annular body along the axial direction, and the annular body, the rotor support and the brake rotor are fixedly connected together through fastening bolts.

Optionally, the rotation-transformation support is made of a non-magnetic material.

Optionally, the rotation-transformation support is a plastic part, a rubber part, an aluminum part or a stainless steel part.

Compared with the prior art, the technical scheme of the invention has the following advantages:

set up solitary rotary transformer space outside the casing that is used for holding the motor, locate rotary transformer in the rotary transformer space for rotary transformer and motor are arranged in different spaces respectively, have changed the current mode of setting up rotary transformer in the motor chamber, thereby can weaken or even eliminate the electromagnetic interference between motor and the rotary transformer, guarantee the working property of wheel hub driver.

Drawings

FIG. 1 is a cross-sectional view of a hub drive according to an embodiment of the present invention;

FIG. 2 is an enlarged partial view of a hub drive in the position of a resolver according to an embodiment of the invention;

fig. 3 is a perspective view of a rotational shift bracket of a hub actuator embodying the present invention.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

Unless otherwise specified, the "axial direction" in the present invention refers to the axial direction of the hub and the rim, and the "radial direction" refers to the radial direction of the hub and the rim.

Referring to fig. 1 and 2, an embodiment of the present invention provides a hub driver 10, where the hub driver 10 includes: a rim (not shown) of the housing 11, a motor 12 and a resolver 13 are provided in the housing 11.

The motor 12 has a motor rotor 121, a motor stator 122 coaxially disposed outside the motor rotor 121, and a rotor support 123 coaxially disposed inside the motor rotor 121, wherein the motor rotor 121 and the rotor support 123 are fixedly connected to each other. The resolver 13 has a resolver rotor 131 and a resolver stator 132 coaxially housed, as shown in fig. 2.

The housing 11 is used to provide a sealed cavity to accommodate components to be sealed, and the sealed cavity includes, for example, a motor cavity for accommodating the motor 12 and a reducer cavity for accommodating a reducer.

As shown in fig. 1 and fig. 2, in the hub drive of the present embodiment, a rotation space 13a is provided outside the housing 11 on one axial side of the housing 11, and the resolver 13 is provided in the rotation space 13 a. The rotary transformer rotor 131 is fixedly connected to the rotor holder 123, and the rotary transformer stator 132 is fixedly connected to the housing 11.

Therefore, in the invention, the independent rotary transformer space 13a is arranged outside the shell 11, the rotary transformer 13 is arranged in the rotary transformer space 13a, and the rotary transformer 13 and the motor 12 are respectively arranged in different spaces, so that the existing arrangement mode of arranging the rotary transformer 13 in the motor cavity is changed, the electromagnetic interference between the motor 12 and the rotary transformer 13 can be weakened or even eliminated, and the working performance of the hub driver is ensured.

The rotary transformer 13 is disposed outside the housing 11, and the rotary transformer rotor 131 and the rotor support 123 of the motor 12 can be fixedly connected in various ways, such as directly connected or connected through an intermediate connector, and the connection manner can be determined according to the position and shape of the rotary transformer 13 and the rotor support 123.

In this embodiment, a mode of connection through an intermediate member is adopted. As shown in fig. 1 and 2 in combination with fig. 3, the resolver 13 further includes a resolver bracket 133 provided on one axial side of the housing 11. As can be seen from fig. 2, the rotation bracket 133 is disposed on the same side of the housing 11 as the rotation rotor 131 and the rotation stator 132.

The rotation bracket 133 is fixed to the rotor bracket 123, and the rotation rotor 131 is fixed to the rotation bracket 133 and is fixedly connected to the rotor bracket 123 through the rotation bracket 133. That is, the rotary transformer bracket 133 serves as an intermediate coupling member between the rotor bracket 123 and the rotary transformer 131 for fixedly coupling the two together. As shown in fig. 2, the rotation bracket 133 and the rotor bracket 123 are fixed at the radially inner end by a first fastening bolt 141.

The rotating bracket 133 is made of a non-magnetic material or a low-magnetic material. Alternative material types for the spinning frame 133 include, but are not limited to, plastic, rubber, aluminum, or stainless steel.

The rotation bracket 133 includes an annular body 133a coaxial with the rim, and a flange 133b located on an outer peripheral edge of the annular body 133a and extending toward the housing 11 in the axial direction, the rotation space 13a is defined by the rotation bracket 133 and the housing 11, and the rotation rotor 131 is fixed to the flange 133 b. As shown in fig. 2, the rotor 131 is fixed to the radial inner side of the flange 133b by using an adhesive, an interference fit, a press-fitting, or a fixing member (e.g., a bolt). The rotating rotor 131 may also be fixed to the ring body 133a if positional conditions permit. The resolver stator 132 is fixed to the housing 11 by a second fastening bolt 142.

The shape of the resolver bracket 133 may be differentiated differently according to the cleanliness of the environment outside the housing 11 in which the resolver 13 is located. If the environmental cleanliness is good enough, the rotation space 13a may not be closed, and in this case, the flange 133b may be a part or parts distributed along the circumferential direction of the annular body 133a as long as the flange 133b can fix the rotation rotor 131, and therefore, the annular body 133a may be provided with openings or openings, such as lightening holes, etc.

Conversely, if the environmental cleanliness is not good enough, the resolver space 13a is preferably provided as a closed space in order to ensure the dustproof and waterproof requirements of the resolver 13. In this case, the flange 133 may be provided in a ring shape coaxial with the rim, and the ring body 133a should not have other openings or holes except for the central mounting hole to achieve a better sealing.

Further, with continued reference to fig. 2, the housing 11 has, on one side of the resolver bracket 133, a first extension 111 extending in the axial direction toward the annular body 133a, the first extension 111 being provided on the inner side of the flange 133b in the radial direction of the rim, and the resolver 13 being provided between the first extension 111 and the flange 133b in the radial direction. The rotor holder 123 has a second extending portion 123a extending toward the annular body 133a in the axial direction, the second extending portion 123a is provided radially inside the first extending portion 111, and a bearing 15 is provided between the first extending portion 111 and the second extending portion 123 a. The housing 11 is supported on the second extension 123a of the rotor holder 123 by the bearing 15.

A first sealing ring 16 is further disposed between the first extension 111 and the second extension 123a, and the first sealing ring 16 is axially located between the bearing 15 and the annular body 133 a. As shown in fig. 2, the first seal ring 16 is specifically provided at the axially outer ends of the first and

second extensions

111 and 123 to effect sealing of the rotation space 13a at the radially inner end. As shown in fig. 2, the housing 11 has a bent portion 123b extending substantially in the axial direction on the radially outer side of the flange 133b, the bent portion 123b partially overlaps the flange 133b with a very small gap therebetween to enhance the sealing property, and the rotation space 13a satisfies the sealing property at the radially outer end by the overlapping portion of the bent portion 123b and the flange 133 b.

Further, a second seal ring may be provided between the flange 133b and the housing 11, and the radially outer end of the swirl space may be sealed by the second seal ring.

The hub drive of this embodiment further comprises a brake located outside the housing 11, the brake having a brake rotor 17 (the brake stator is not shown in the figures), the brake rotor 17 being fixedly connected to the rotor support 123. When the rotation space 13a is a non-sealed space, it is preferable that the stopper and the resolver 13 are respectively disposed at two axial sides of the housing 11 to prevent dust and debris generated by the operation of the stopper from entering the rotation space 13 a. When the rotation space 13a is a sealed space, the stopper and the rotation transformer 13 may be disposed on the same side of the housing 11.

In the embodiment shown in fig. 1 and 2, the resolver space 13a is a sealed space, and the brake and the resolver 13 are disposed on the same side of the housing 11. Specifically, in the axial direction, the brake rotor 17 is located on a side of the annular body 133a facing away from the rotor holder 123, that is, the rotor holder 123 and the brake rotor 17 are respectively located on two axial sides of the annular body, and the annular body 133a, the rotor holder 123 and the brake rotor 17 are fixedly connected together by the first fastening bolt 141.

As a modification of this embodiment, when the brake and the resolver 13 are provided on the same side of the housing 11, the resolver rotor 131 may be connected only to the brake rotor 17 and connected to the rotor holder 123 through the brake rotor 17. In short, it is sufficient that the rotor 131 and the rotor holder 123 can be finally coupled together.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A hub driver comprising: the wheel rim is internally provided with a shell, the motor is positioned in the shell, the motor is provided with a rotor bracket which is fixedly connected with a motor rotor, and the rotary transformer is provided with a rotary transformer stator and a rotary transformer rotor which are coaxially sleeved;

the rotary transformer is characterized by further comprising a rotary transformer space arranged outside the shell, wherein the rotary transformer space is positioned on one axial side of the shell, and the rotary transformer is arranged in the rotary transformer space;

the rotary transformer rotor is fixedly connected with the rotor support, and the rotary transformer stator is fixedly connected with the shell.

2. The hub drive of claim 1, wherein the rotary transformer further comprises a rotary transformer carrier disposed on the one axial side of the housing;

the rotary transformer support is fixed on the rotor support, and the rotary transformer rotor is fixed on the rotary transformer support and is fixedly connected with the rotor support through the rotary transformer support.

3. The hub drive of claim 2 wherein the nutating bracket has an annular body coaxial with the rim and a flange located at an outer periphery of the annular body and extending axially toward the housing;

the rotary space is enclosed by the rotary support and the shell, and the rotary rotor is fixed on the flange.

4. The hub drive of claim 3 wherein the flange is annular and coaxial with the rim.

5. The hub drive of claim 3 wherein the housing has a first extension at one side of the resolver bracket extending in the axial direction toward the annular body, the first extension being disposed radially inward of the flange of the rim, the resolver being disposed radially between the first extension and the flange;

the rotor bracket is provided with a second extending part which extends towards the annular body along the axial direction, and the second extending part is arranged on the inner side of the first extending part along the radial direction;

and a bearing is arranged between the first extension part and the second extension part.

6. The hub drive of claim 5, further comprising a first seal disposed between the first extension and the second extension, the first seal being disposed between the bearing and the annular body in the axial direction.

7. The hub drive of claim 4, wherein a second seal is disposed between the flange and the housing.

8. The hub drive of claim 6, further comprising a brake located outside the housing, the brake having a brake rotor;

the brake rotor is located on one side, back to the rotor support, of the annular body along the axial direction, and the annular body, the rotor support and the brake rotor are fixedly connected together through fastening bolts.

9. The hub drive of any of claims 2-8, wherein the spin stand is a magnetically non-conductive material.

10. The hub drive of any of claims 2-8, wherein the spin stand is a plastic, rubber, aluminum, or stainless steel member.