CN217440588U

CN217440588U - Transmission mechanism

Info

Publication number: CN217440588U
Application number: CN202220355243.7U
Authority: CN
Inventors: 李天鹏; 孙佳斌; 孔海洋
Original assignee: ZF Friedrichshafen AG
Current assignee: ZF Friedrichshafen AG
Priority date: 2022-02-22
Filing date: 2022-02-22
Publication date: 2022-09-16
Anticipated expiration: 2032-02-22

Abstract

The utility model provides a transmission mechanism, transmission mechanism has the rotation axis be provided with the gear on the rotation axis fixedly, transmission mechanism is still including establishing the cover in order to be used for the supporting on the rotation axis the bearing of rotation axis, the bearing includes inner circle and outer lane, wherein the outer lane of bearing is at the orientation rotatory epaxial be provided with the flange of radial outside extension on one side of gear, be used for with the bearing is fixed, and the external diameter of flange is less than the external diameter of gear. By fixing the bearing with a flanged bearing, the snap spring and the snap groove for the snap spring on the housing or the bearing support can be omitted, so that the gear on the rotary shaft can be arranged as close as possible to the bearing. Therefore, the axial dimensions of the rotary shaft and the transmission mechanism can be reduced.

Description

Transmission mechanism

Technical Field

The utility model relates to a transmission mechanism, this transmission mechanism have the rotation axis, are provided with the gear on the rotation axis fixedly, and this transmission mechanism is still including establishing the bearing of cover in order to be used for supporting the rotation axis on the rotation axis.

Background

The transmission mechanism typically includes a rotating shaft fixedly provided with a gear wheel, which is supported on bearings on the rotating shaft. In order to fix the bearing outer ring, a snap spring is usually arranged in a snap groove on the housing so that the bearing bears the axial force.

However, due to the presence of the snap spring and the snap groove on the housing, the gear on the rotating shaft cannot be disposed as close to the bearing as possible, and therefore the axial dimensions of the rotating shaft and the transmission mechanism cannot be reduced.

SUMMERY OF THE UTILITY MODEL

The utility model provides a solve the drive mechanism of above-mentioned problem, drive mechanism has the rotation axis fixedly be provided with the gear on the rotation axis, drive mechanism is still including establishing the cover in order to be used for the supporting on the rotation axis the bearing of rotation axis, the bearing includes inner circle and outer lane, wherein, the outer lane of bearing is at the orientation rotatory epaxial be provided with the flange of radial outside extension on one side of gear, be used for with the bearing is fixed, and the external diameter of flange is less than the external diameter of gear.

By fixing the bearing by means of the flange bearing, it is possible to dispense with a snap spring and a snap groove for the snap spring on the housing or the bearing support, so that the gear on the rotary shaft can be arranged as close as possible to the bearing. Therefore, the axial dimension of the housing or the bearing support, and thus the rotary shaft (also the axial dimension of the transmission mechanism) can be reduced. Further, since the outer diameter of the flange is smaller than that of the gear, the size and weight of the bearing can be reduced.

According to the preferred embodiment of the present invention, the gear on the rotating shaft is disposed adjacent to the bearing.

According to the preferred embodiment of the present invention, the gear is provided with a through hole at a position corresponding to the flange of the outer ring of the bearing in the axial direction.

The gear is provided with a through hole through which a fastener and a fastening tool can be brought close to a flange of an outer ring of the bearing, thereby facilitating fixing of the bearing.

According to the preferred embodiment of the present invention, the flange of the outer ring of the bearing is provided with a through hole, and the bearing is fixed by a bolt passing through the through hole in the flange

The flange bearing with the flange is fixed by using the bolts, so that the flange is more stable and reliable, the axial precision of the bearing can be ensured, the axial clearance between the bearing and the shell of the transmission mechanism is eliminated, and the flange bearing is less susceptible to temperature influence.

According to the utility model discloses a preferred scheme, the rotation axis has bearing installation department, the bearing sets up on the bearing installation department, bearing installation department's external diameter is less than the external diameter of the main part of rotation axis.

According to the utility model discloses a preferred scheme, the rotation axis has gear installation department, the gear sets up on the gear installation department, gear installation department's external diameter is less than the external diameter of the main part of rotation axis.

The bearing installation part and the gear installation part with smaller outer diameters are utilized, so that the installation of the gear and the bearing on the rotating shaft and the installation of the rotating shaft in the transmission device can be facilitated.

Drawings

Fig. 1 is a schematic view of an electric drive according to a transmission mechanism comprising an embodiment of the invention;

fig. 2 is a sectional view showing the intermediate shaft of the gear mechanism of the electric drive in fig. 1, the gears and bearings mounted on the intermediate shaft, and the fixing of the bearings to the housing of the gear mechanism.

Detailed Description

An embodiment according to the invention is further explained below with reference to the drawings.

Fig. 1 shows a schematic illustration of an electric drive 10 for a motor vehicle having a transmission according to an embodiment of the invention. The drive device comprises a drive motor 11 and a transmission 12. The drive motor 11 includes a stator 16s, a rotor 16r, and a rotor shaft 34, the rotor shaft 34 may extend into the transmission 12 and serve as an input shaft of the transmission 12. In further embodiments, the rotor shaft 34 of the drive motor 11 and the input shaft of the transmission mechanism 12 may be formed separately, and the rotor shaft 34 is coupled to the input shaft of the transmission mechanism 12. A gear 18 is fixedly arranged on the rotor shaft 34 of the drive motor 11 or on the input shaft of the gear mechanism 12. The transmission 12 also includes a rotatably supported intermediate shaft 36. A gear 20 is fixedly disposed on the intermediate shaft 36, and the gear 20 is meshed with the gear 18 for transmitting torque. Also fixedly disposed on the intermediate shaft 36 is a gear 22, which gear 22 meshes with a gear 24 on the housing of the differential 26 to transmit torque to the differential 26. Torque is transferred to two wheels (not shown) of the vehicle via differential 26.

The intermediate shaft 36 is supported by two bearings, specifically, a first bearing 50 fitted over the left side end of the intermediate shaft 36 in fig. 1 and a second bearing 52 fitted over the right side end of the intermediate shaft 36 in fig. 1.

In order to minimize the size of the electric drive 10, the axial size of the gear mechanism 12 should be minimized. One way to reduce the axial dimension of the transmission 12 is to reduce the axial length of the shaft in the transmission 12. This can be achieved by placing the gear 20 on the intermediate shaft 36 as close as possible to the first bearing 50.

In the prior art, a snap spring is usually used to fix the bearing 50. Therefore, it is necessary to provide a detent for the snap spring on the housing 30 or the bearing support of the gear mechanism 12. The arrangement of the circlip and the catch makes it impossible to locate the gear 20 as close as possible to the first bearing 50 and therefore increases the length of the housing or bearing support and hence the length of the intermediate shaft 36.

According to an embodiment of the present invention, the first bearing 50 is provided as a flange bearing.

Fig. 2 shows a detailed view of the rotatable mounting of the intermediate shaft 36 in the gear mechanism 12 by means of a flange bearing 50, wherein the gear wheel 22 from fig. 1 is not shown for the sake of simplicity. As shown in fig. 2, the flange bearing 50 has an inner ring 61 and an outer ring 62, wherein the outer ring 62 is provided with a radially outwardly extending flange 63 on the side facing the gearwheel 20 on the intermediate shaft 36 for fixing the first bearing 50. For example, the first bearing 50 may be secured to the housing 30 of the transmission 12 with bolts 64 passing through perforations in the flange 63 of the outer race 62 of the bearing 50.

The outer diameter of the flange 63 on the outer race 62 of the first bearing 50 is smaller than the outer diameter of the gear 20 on the intermediate shaft 36. In this case, in order to tighten the bolt 64, a tightening tool may be inserted to approach the bolt 64 through a through-hole 71 provided in a portion of the gear 20 on the intermediate shaft 36 corresponding to the flange 63 of the outer race 62 of the first bearing 50 in the axial direction. The through-hole 71 in the gear 20 of the intermediate shaft 36 may be a lightening hole or a through-hole provided specifically for inserting a tightening tool.

In addition to the bolts 64, other securing means known to those skilled in the art may be used to secure the outer race 62 of the first bearing 50. The required tool for fixing can be inserted through the through hole 71 in the gear 20 on the intermediate shaft 36 to access the flange 63 on the outer ring 62 of the first bearing 50.

In the illustrated embodiment, the intermediate shaft 36 has a bearing mounting portion 81 thereon, the first bearing 50 being disposed on the bearing mounting portion 81, the bearing mounting portion 81 having an outer diameter that is less than an outer diameter of the main body 80 of the intermediate shaft 36.

In the illustrated embodiment, the intermediate shaft 36 has a gear mounting portion 82 thereon, the gear 20 being disposed on the gear mounting portion 82, the gear mounting portion 82 having an outer diameter that is smaller than the outer diameter of the main body 80 of the intermediate shaft 36. In addition, the gear mounting portion 82 may have an outer diameter larger than that of the bearing mounting portion 81.

The steps of mounting the intermediate shaft 36 in the transmission 12 are as follows:

1) providing an intermediate shaft 36;

2) securing the gear 20 to the intermediate shaft 36 proximate one end of the intermediate shaft 36, particularly to the gear mounting portion 82 of the intermediate shaft 36;

3) fixing a first bearing 50, i.e. a flange bearing, on the intermediate shaft 36, in particular on a bearing mounting 81 of the intermediate shaft 36, near one end of the intermediate shaft 36, and fixing a second bearing 52 on the intermediate shaft 36 at the other end of the intermediate shaft 36;

4) rotatably supporting intermediate shaft 36 in drive mechanism 12 by

mounting bearings

50, 52 on intermediate shaft 36 to bearing mounts on drive mechanism 12;

5) a tightening tool is inserted through the through-hole 71 in the gear 20 of the intermediate shaft 36 to tighten the bolt 64 to secure the flange 63 of the outer race 62 of the first bearing 50 to the transmission 12.

The second bearing 52 on the other end of the intermediate shaft 36 may be a conventional bearing or a flange bearing and may be secured by a circlip or similarly by bolts.

In the above embodiment, the rotating shaft provided with the gear supported by the flange bearing 50 is the intermediate shaft 36 in the transmission mechanism 12, but the present invention is not limited thereto. The rotating shaft may be other rotating shafts provided with a gear as long as the outer diameter of the gear is large enough to form a through hole in the gear through which a tool for fastening is passed.

In the above embodiment, the flange bearing 50 is fixed to the housing 30 of the transmission mechanism 12, but the present invention is not limited thereto. The flange bearing 50 may also be fixed to another component (bearing support) that is fixed to the housing 30 of the transmission 12.

In the above embodiment, the transmission mechanism 12 is a part of the electric drive device 10 and is coupled with the drive motor 11, but the present invention is not limited thereto. The transmission mechanism may be any transmission mechanism as long as it has a rotating shaft fixedly provided with a gear to be rotatably supported.

Although particular embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these are examples only and that the scope of the present invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and the principles of the present invention, and these changes and modifications are all within the scope of the present invention.

Claims

1. A gear transmission having a shaft on which a gear is fixedly disposed, the gear transmission further comprising a bearing fitted over the shaft for supporting the shaft, the bearing comprising an inner race and an outer race, characterized in that the outer race of the bearing is provided with a radially outwardly extending flange on a side of the shaft facing the gear, for fixing the bearing, and the outer diameter of the flange is smaller than the outer diameter of the gear.

2. The transmission mechanism as claimed in claim 1, wherein the gear on the rotating shaft is disposed proximate to the bearing.

3. The transmission mechanism according to claim 2, wherein a portion of the gear corresponding to the flange of the outer ring of the bearing in the axial direction is provided with a through hole.

4. A transmission according to claim 3, wherein the flange of the outer race of the bearing is provided with perforations, the bearing being secured via bolts passing through the perforations in the flange.

5. The transmission mechanism as claimed in claim 1, wherein the rotary shaft has a bearing mounting portion on which the bearing is provided, the bearing mounting portion having an outer diameter smaller than an outer diameter of a main body of the rotary shaft.

6. The transmission mechanism as claimed in claim 1, wherein the rotary shaft has a gear mounting portion on which the gear is provided, the gear mounting portion having an outer diameter smaller than an outer diameter of a main body of the rotary shaft.