JPH05240260A - Flexible coupling gear - Google Patents

Abstract

PURPOSE:To provide a flexible gear coupling never causing a noise by the abnormal vibration of a coupling sleeve at the time of rotating without transmitting rotating force between the rotating shaft of an electric motor and the pinion shaft of a gear unit. CONSTITUTION:In a flexible gear coupling, outer tooth gears 12 are fitted to inner tooth gears 11 provided on both end inner circumferences of a cylindrical cup ring sleeve 10, respectively, all teeth 11a, 12a are mutually geared with a back rush and a top clearance, and one outer tooth gear 12 is fixed to the rotating shaft of an electric motor. The other outer tooth gear 12 is fixed to a pinion shaft causing an axial displacement relative to the rotating shaft, and the rotating shaft is flexibly connected to the pinion shaft. A restraining means 13 for keeping the tooth 11a of the inner tooth gear 11 and the tooth 12a of the outer tooth gear 12 in the contact state is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a gear type which flexibly connects a rotating shaft of an electric motor mounted on a bogie frame of a train and a pinion shaft of a gear unit mounted on an axle displaceable with respect to the rotating shaft. Regarding flexible shaft couplings.

[0002]

2. Description of the Related Art FIG. 3 shows, for example, an advertising printed matter "Mitsubishi WN drive drive" (AL-7211-
B, made in September 1988), which is a plan view showing a bogie using the conventional gear type flexible shaft coupling, and FIG. 4 is an internal tooth gear and an external tooth of the gear type flexible shaft coupling of FIG. FIG. 2 is a cross-sectional view (A) showing a gear and an enlarged view (B) showing an enlarged main part thereof. First, in FIG. 3, 1 is a bogie frame, 2 is an axle that is elastically supported by the bogie frame 1 and is attached so as to be movable left and right, 3 is a wheel that is fitted and fixed in the axle 2, and 4 is attached to the axle 2. A gear unit, 5 is an electric motor mounted on the bogie frame 1 with its rotating shaft parallel to the axle 2, and 6 is a gear-type flexible shaft coupling that flexibly connects the pinion shaft of the gear unit 4 and the rotating shaft of the electric motor 5, Reference numeral 7 is a towing unit for carrying and pulling a vehicle body (not shown). Next, in FIG. 4 (A) (B),
Reference numeral 10 is a cylindrical coupling sleeve of the gear type flexible shaft coupling 6, 11 is an internal gear provided on both inner circumferences of the coupling sleeve 10, 11a is a tooth of the internal gear 11, 12 is an internal gear.
External gears that mesh with 11 respectively, one of which is fixed to the rotating shaft of the electric motor 5 and the other of which is fixed to the pinion shaft of the gear unit 4. 12a is a tooth of the external gear.

Next, the operation will be described. The rotational force of the electric motor 5 fixed to the bogie frame 1 is transmitted to the gear unit 4 via the gear type flexible shaft coupling 6 and rotationally drives the axle 2 and the wheel 3. The frictional force between the wheels 3 and the rail (not shown) acts as a traction force on the truck or a vehicle body (not shown) mounted on the truck to cause the truck to travel. The axle 2 is elastically supported by the bogie frame 1 for the purpose of reducing vibration of the vehicle body and improving riding comfort. When the bogie or the vehicle body travels, the shaft spring (not shown) that supports the axle 2 bends due to the irregularities of the rail surfaces or the seams of the rails, and the axle box (not shown) moves to the left and right, so that the axle 2 becomes the bogie frame. 1, and a considerably large axial displacement occurs between the rotating shaft of the electric motor 5 fixed to the bogie frame 1 and the pinion shaft of the gear unit 4 attached to the axle 2. Since this axial displacement constantly fluctuates, the rotational shaft of the electric motor 5 and the pinion shaft of the gear unit 4 are flexibly connected to transmit the rotational force. The teeth 12a of the two external gears 12 of the gear type flexible shaft coupling 6 and the teeth of the internal gear 11 provided on the inner periphery of both ends of the coupling sleeve 10.
11a all mesh with each other, but in order to allow both external gears 12 to be axially displaced with respect to the internal gear 11 to a certain angle, special crowning (crown) is applied to the tips of the external gears 12.
ning) to form a curved surface, and between the external gear 12 and the internal gear 11 that mesh with each other, backlash (play between tooth surfaces) and apex (distance between tip circle and root circle) ) Is provided to obtain smooth flexibility.

[0004]

The conventional gear type flexible shaft coupling is constructed as described above, and the teeth of the external gear 12 mesh with each other when rotating without transmitting the rotational force.
The backlash provided between the tooth 12a and the tooth 11a of the internal gear 11 causes the tooth 12a and the tooth 11a to repeatedly collide with each other.
There has been a technical problem to be solved that the coupling sleeve 10 provided with is vibrated abnormally to generate noise.

The present invention has been made in order to solve the above problems, and is a coupling when rotating without transmitting a rotational force between the rotating shaft of the electric motor and the pinion shaft of the gear unit. An object of the present invention is to provide a gear-type flexible shaft joint in which the sleeve does not vibrate abnormally and generate noise.

[0006]

A gear-type flexible shaft coupling according to the present invention has a backlash and a peak by fitting external gears to internal gears provided on the inner circumferences of both ends of a cylindrical coupling sleeve. Bite all the teeth together,
While fixing one external gear to the rotary shaft of the electric motor,
In the one in which the other external gear is fixed to the pinion shaft that causes a relative axial displacement with respect to the rotation shaft and the rotation shaft and the pinion shaft are flexibly connected, the rotation force is generated between the rotation shaft and the pinion shaft. The restraint means is provided for keeping the teeth of the internal gear and the teeth of the external gear in contact with each other when rotating without transmission.

[0007]

The restraint means in the present invention keeps the teeth of the internal gear and the teeth of the external gear in contact with each other when rotating without transmitting the rotational force between the rotary shaft and the pinion shaft.

[0008]

【Example】

Example 1. An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view (A) showing an internal gear and an external gear that mesh with each other in the embodiment, and an enlarged view (B) showing an enlarged main part thereof.
Is. 1 (A) (B), 10, 11, 11a, 12, 12a
Is the same as in a conventional gear type flexible shaft coupling. Reference numeral 13 denotes a permanent magnet embedded in the tooth 11a of the internal gear 11, which corresponds to a restraint means.

This embodiment is constructed as described above, and the permanent magnets 13 are embedded in all the teeth 11a of the internal gear 11 so that the teeth 12a of the external gear 12 and the teeth 11a of the internal gear 11 which are in mesh with each other are magnetized. Apply the attractive force. When rotating without transmitting the rotational force between the rotation shaft of the electric motor 5 and the pinion shaft of the gear unit 4, the teeth 11 a of the internal gear 11 and the external gear 12 are generated by the magnetic attractive force of the permanent magnet 13. The tooth 12a is kept in contact with each other, and the coupling sleeve 10 provided with the internal gear 11 does not vibrate abnormally due to repeated collisions due to backlash applied between the teeth 11a and the tooth 12a meshing with each other. . Further, when the rotational force is transmitted to the pinion shaft of the rotary shaft gear unit 4 of the electric motor 5, if the rotational force acts in the same direction as the magnetic attraction force of the permanent magnet 13, the internal gear 11 is rotated. If the tooth 11a and the tooth 12a of the external gear 12 are in contact with each other on the same tooth surface as described above and the rotational force acts in the direction opposite to the magnetic attractive force of the permanent magnet 13, the rotational force is greater than the magnetic attractive force. Since it is much larger, the tooth 11a of the internal gear 11 and the tooth 12a of the external gear 12 come into contact with each other on the opposite tooth surfaces with the backlash interposed therebetween, because they are far larger.

Embodiment 2. FIG. 2 is a sectional view showing an internal gear and an external gear that mesh with each other in another embodiment of the present invention. In this embodiment, the internal gear 11 and the external gear 12 have springs 14
The elastic force of the spring 14 causes the elastic force of the inner teeth to be transmitted between the rotating shaft of the electric motor 5 and the pinion shaft of the gear unit 4 without transmitting the rotating force. The tooth 11a of the gear 11 and the tooth 12a of the external gear 12 are kept in contact with each other, and due to the backlash applied between the teeth 11a and the tooth 12a which mesh with each other, the collision is repeated and the internal gear 11
The coupling sleeve 10 provided with does not vibrate abnormally. When transmitting the rotational force between the rotating shaft of the electric motor 5 and the pinion shaft of the gear unit 4, if the rotating force acts in the same direction as the elastic force of the spring 14, the internal gear 11
11a of the external gear 12 and the tooth 12a of the external gear 12 are in contact with each other on the same tooth surface as described above, and if the rotational force acts in the direction opposite to the elastic force of the spring 14, the rotational force is far greater than the elastic force of the spring 14. Since it is large, it overcomes this and teeth 11a of internal gear 11 and external gear 12
The teeth 12a of each of the teeth 12a are in contact with each other on the opposite tooth surfaces with the backlash interposed therebetween. In this embodiment, the spring 14 corresponds to the restraint means.

[0011]

As described above, according to the present invention, the teeth of the internal gear and the teeth of the external gear are rotated when the rotary shaft and the pinion shaft rotate without transmitting the rotational force. Since the restraint means for keeping the contact state is provided, there is an effect that the coupling sleeve provided with the internal gear does not abnormally vibrate and generate noise.

[Brief description of drawings]

FIG. 1 is a cross-sectional view (A) showing an internal gear and an external gear that mesh with each other in an embodiment of the present invention and an enlarged view (B) of a main part thereof.

FIG. 2 is a cross-sectional view showing an internal gear and an external gear that mesh with each other in another embodiment of the present invention.

FIG. 3 is a plan view showing a dolly using a conventional gear type flexible shaft coupling.

FIG. 4 is a cross-sectional view (A) showing an internal gear and an external gear that mesh with each other of the gear type flexible shaft coupling of FIG. 3 and an enlarged view of a main part thereof.
(B).

[Explanation of symbols]

 1 bogie frame 2 axle 3 wheel 4 gear unit 5 electric motor 6 gear type flexible shaft coupling 11 internal gear 11a tooth 12 external gear 12a tooth 13 permanent magnet 14 spring

Claims (1)

[Claims] 1. An external gear is fitted into internal gears provided on the inner circumferences of both ends of a cylindrical coupling sleeve, and all teeth are engaged with each other by providing a backlash and a peak. A gear-type flexure that is fixed to the rotating shaft of the electric motor, and the other external gear is fixed to the pinion shaft that causes axial displacement relative to the rotating shaft to flexibly connect the rotating shaft and the pinion shaft. In the shaft coupling, restraining means for keeping the teeth of the internal gear and the teeth of the external gear in contact with each other when rotating without transmitting the rotational force between the rotary shaft and the pinion shaft. A gear type flexible shaft joint characterized by being provided.