JPH09119511A - Gear device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide high speed property, eliminate regulation of bearing gap after assembly, and eliminate inspection of a bearing. SOLUTION: Cylindrical ball bearings 13, 14 are arranged on the axial direction both sides of a gear 12 fixed on a shaft 11, and also a four point contact type or three point contact type ball bearing 15 is arranged on the axial direction one side of the gear 12 so as to rotatably support the shaft 11 in a gear box 16. The inner wheel 15b of the four point contact type or three point contact type ball bearing 15 is assembled to divide into two parts on an axial direction center part, and the ball bearing 15 is arranged on the axial end side of the gear shaft 11. A pull-out step part is arranged on the inner wheel of the axial end side. The cylindrical ball bearing 14 of a side where the ball bearing 15 is arranged, may be eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear device for railway vehicles and other gear devices used at high speed rotation.

[0002]

2. Description of the Related Art As a drive system for railway vehicles, a main electric motor is fixed in parallel to a driving wheel shaft to a bogie frame (on a spring), and a power transmission gear device is provided between an armature shaft of the main electric motor and the driving wheel shaft. Installed, the armature shaft and the small gear shaft supported in the gear device are connected by a flexible joint, and the large gear that meshes with the small gear on this small gear shaft is fixed to the driving wheel shaft to move from the main motor. There is a system that transmits power to the wheel axle.

In a railroad vehicle, a helical gear is adopted in order to mitigate impact at the time of starting or shifting, and a radial load and an axial load act on a shaft supported in a gear device. .

Therefore, in the conventional gear device of the above-described system, as shown in FIG. 3, the small gear shaft is connected to the armature shaft of the main motor through the flexible joint in order to support the small gear shaft. Tapered roller bearings 3 and 4 are used in a form of a front combination with a small gear 2 fixed on the surface of the bearing 1. The bearing structure on the driving wheel shaft side is almost the same. In FIG. 3, 5 is a gear box main body, 6 is a gear box cover on the main motor side, 7 is a gear box cover on the shaft end side, and 8 is a shim.

When the tapered roller bearings 3 and 4 are used in the form of frontal combination with the small gear 2 interposed therebetween as described above, in order to maintain the axial clearance of the assembled tapered roller bearings 3 and 4 at an appropriate value, The thickness of the shim 8 interposed between the gear box body 5 and the gear box lid 7 on the shaft end side is variously changed to adjust the clearance.

[0006]

In the conventional gear device,
Adjustment of axial clearance by shim 8 (usually 60-180
However, there is a problem that the assembly work including the management of the shim 8 and the reassembly work after the inspection are complicated.

Further, as the speed of the vehicle increases, it is necessary for the bearing to withstand high-speed rotation. However, in the tapered roller bearing, since the end faces of the rollers are in sliding contact with the collar portion of the inner ring, the allowable number of rotations is high. There is a problem that it is lower than cylindrical roller bearings and ball bearings.

Further, in a high-speed vehicle, an aluminum alloy is used for the gear box in order to reduce the weight, and due to the difference in linear expansion coefficient between the material of the shaft (eg case hardening steel) and the material of the gear box, the There is also a problem that when the ambient temperature changes, the axial clearance also changes.

Therefore, an object of the present invention is to eliminate the above-mentioned problems of the conventional gear device, to provide high speed, to eliminate the need to adjust the bearing clearance after assembly, and to make the inspection of the bearing easy. To provide.

[0010]

In order to achieve the above object, the present invention has cylindrical roller bearings arranged on one side or one side in the axial direction of a gear fixed on a shaft, and one side in the axial direction of the gear. Alternatively, in a gear device in which a four-point contact type or three-point contact type ball bearing is arranged on the non-arranged side of a cylindrical roller bearing and the shaft is rotatably supported in a gear box, the four-point contact type or the three-point contact type is used. The inner ring of the ball bearing is assembled so that it can be divided into two at the central portion in the axial direction, and the ball bearing is arranged on the shaft end side of the gear shaft.

The inner ring of the four-point contact type or three-point contact type ball bearing is provided with an inner ring pulling step, and the ball bearing is arranged on the shaft end side of the gear shaft.

As described above, the present invention uses a cylindrical roller bearing for carrying the radial load of the gear shaft on both sides or one side of the gear, instead of the conventional front face combination of the tapered roller bearing. , Mainly using a four-point contact type or three-point contact type ball bearing for carrying an axial load (also capable of carrying a radial load at the same time), eliminating the need to adjust the axial clearance with a shim after assembly, and It is possible to eliminate the factor that impedes speeding up due to frictional heat generation due to sliding contact between the roller end surface of the tapered roller bearing and the flange portion, and to provide high speed performance.

Then, the inner ring of the four-point contact type or three-point contact type ball bearing is assembled in such a manner that it can be divided into two parts at the central portion in the axial direction, and the ball bearing is arranged on the shaft end side of the gear shaft. Inspection is easy and assembly work is easy. Further, by providing the pulling step portion on the inner ring, the removal work becomes easy.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described below with reference to the embodiments of the drawings. FIG. 1 shows an embodiment of a gear device according to the present invention, in which a small-diameter portion 11 on both sides in the axial direction of a gear 12 fixed onto a large-diameter portion 11a of a shaft 11 by press fitting or the like.
The cylindrical roller bearings 13 and 14 are arranged on b and 11c, and the four-point contact type or three-point contact type ball bearing 15 is arranged on one side of the gear 12 in the axial direction to rotate the shaft 11 in the gear box 16. It is a possible endorsement.

The gear box 16 comprises a gear box body 16a which is open on both sides in the axial direction, and gear box lids 16b and 16c which close both open portions of the gear box body 16a. The gear box main body 16a is detachably assembled with fastening bolts on both sides of the opening.

The left end of the shaft 11 in FIG. 1 is connected to the armature shaft of the main motor via a flexible joint, and the gear box cover 16b on this side has a through hole 16b 'through which the shaft 11 penetrates.
An annular step portion 16b ″ for assembling one of the cylindrical roller bearings 13 is formed inside the through hole 16b ′, and the inner surface of the annular step portion 16b ″ has an inner ring surface of the cylindrical roller bearing 13. 13a is fitted and fixed with a clip 17. An annular seal member 18 is mounted between the through hole 16b ′ and the outer circumference of the shaft 11.

The gear box cover 16c on the right end side of the shaft 11 in FIG. 1 has a through hole 1 for mounting the other cylindrical roller bearing 14 and a four-point contact type or three-point contact type ball bearing 15.
6c ′ and an annular step portion 16c ″ having an inner diameter surface continuous with the through hole 16c ′ are formed.
The outer ring 14a of the cylindrical roller bearing 14 and the outer ring 15a of the four-point contact type or three-point contact type ball bearing 15 are fitted to the inner diameter surface of the outer ring 14a of the cylindrical roller bearing 14 and the four-point contact type or three-point contact type. The outer ring 15a of the contact type ball bearing 15 is detachably attached to the outside of the through hole 16c '.
It is fixed to the inner diameter surface of the annular step portion 16c ″ by 6d.

The above-mentioned four-point contact type or three-point contact type ball bearing 15
The inner ring 15b is divided into two parts at the central part in the axial direction, one 15b 'is directly fitted to the small diameter part 11c of the shaft 11, while the other 15b "is detachably attached to the right end of the shaft 11. It is indirectly fitted via the shaft lid 19. That is, the annular step portion 19a of the shaft lid 19 is fitted with an inner diameter surface on a smaller diameter portion 11d formed at the right end of the shaft 11,
The other side 15b ″ of the inner ring 15b of the ball bearing 15 is fitted on the outer diameter surface of the annular step portion 19a.

With the above structure, the small lid 1 can be used when inspecting the bearing.
6d is removed, and the shaft lid 19 is attached to the inner ring 15 on the shaft end side.
When the gear box cover 16c on the right side in FIG. 1 is removed from the gear box body 16a by removing it together with b ″ from the shaft 11, the outer ring 14a of the cylindrical roller bearing 14 on the right side and the outer ring 15a, the ball 15c of the ball bearing 15 and the holding The device (not shown) can be taken out integrally from the shaft 11 and the gear box body 16a.

FIG. 2 shows another embodiment for further facilitating the removal of the inner ring 15b ". That is, the inner ring 15b" has a ring for pulling out the inner ring on the outer diameter surface of the end on the shaft lid 19 side. The stepped portion 15b ″ ′ is provided, and at the time of removal, after removing the shaft lid 19, the inner ring 15b ″ is removed by hooking a pulling jig on the stepped portion 15b ″ ′.

In the above-mentioned four-point contact type ball bearing, the raceways of the balls for both the inner ring and the outer ring are Gothic arch-shaped grooves, and the balls and the rolling faces of the inner and outer rings make contact at four points. It is a structure that can carry both a radial load and an axial load, and a combined load of these. Also, in the three-point contact type ball bearing, one groove of the inner and outer races has a Gothic arch shape, and the other groove has a deep arc shape.
The ball contacts the Gothic arch groove at two points and the deep arc groove at one point, which can also carry both radial and axial loads and their combined load. It is a structure.

The gear device of the present invention is constructed as described above and has the following operating characteristics. Cylindrical roller bearing 13,
14 and a ball bearing 15 rotatably support the gear shaft 11 in a gear box 16. Therefore, when the shaft 11 is rotationally driven by the main electric motor and the gear 12 mounted on the shaft 11 meshes with the gear mounted on the driving wheel shaft to transmit the rotational torque, the shaft 11 has a radial load. Axial load and combined load of these act. The cylindrical roller bearings 13 and 14 carry a radial load acting on the shaft 11, and the ball bearing 15 mainly carries an axial load.
5 cooperate to carry.

The gear device of the present invention is, as a modified embodiment,
In FIG. 1, the cylindrical roller bearing 14 on the right side of the gear 12 is omitted, and the cylindrical roller bearing 13 is arranged on the left side of the gear 12.
You may implement by the structure which arrange | positions only the ball bearing 15 on the right side. Also in this case, it is desirable to provide the step for pulling out the inner ring. Although the gear device of the present invention can be used for railway vehicles, it can also be used for other applications such as ships, aircraft and automobiles.

[0024]

According to the present invention, a cylindrical roller bearing for carrying a radial load of a gear shaft and a four-point contact type or three-point contact type ball bearing mainly for carrying an axial load are used. It is not necessary to adjust the axial clearance by the shim after assembly, and it is possible to eliminate high-speed obstacles such as friction heat generation due to sliding contact between the roller end surface of the conventional tapered roller bearing and the collar part, and to provide high speed. .

The inner ring of the four-point contact type or three-point contact type ball bearing is assembled so that it can be divided into two parts at the axial center, and the ball bearing is arranged on the shaft end side of the gear shaft. Inspection is easy and assembly work is easy. Further, by providing the pull-out step portion on the inner ring, the work for removing the inner ring becomes easy.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional side view of an upper half of a main part showing an embodiment of a gear device according to the present invention.

FIG. 2 is a vertical sectional side view of the upper half of the bearing portion on the shaft end side showing another embodiment of the gear device according to the present invention.

FIG. 3 is a vertical sectional side view of an upper half of a main part of a conventional gear device.

[Explanation of reference signs] 11 gear shaft 12 gears 13, 14 cylindrical roller bearing 15 ball bearing 16 gear box

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Kenji Okada 1-1-50, Akatsukidai, Yokkaichi-shi, Mie (72) Inventor Masahiko Kataoka 35, 1-15-15 Matsunoki, Kuwana-shi, Mie

Claims (2)

[Claims] 1. A cylindrical roller bearing is arranged on both sides or one side in the axial direction of a gear fixed on a shaft, and a four-point contact type or three is arranged on one side in the axial direction of the gear or a non-arranged side of the cylindrical roller bearing. In a gear device in which a point-contact type ball bearing is arranged and the shaft is rotatably supported in a gear box, the inner ring of a four-point contact type or three-point contact type ball bearing is assembled so that it can be divided into two parts at the central portion in the axial direction. And a gear device in which the ball bearing is arranged on the shaft end side of the gear shaft. 2. A four-point contact type or three-point contact type ball bearing is provided with an inner ring pulling step portion on the inner ring and the ball bearing is arranged on the shaft end side of the gear shaft. Gear device.