JPH1089438A - Transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain a load to be applied to a gear pump at a light degree by providing a crown gear to be engaged with a first rotor, and connecting a first and a second rotors to each other with a joint part for transmitting the rotation of the first rotor to the second rotor. SOLUTION: When an input shaft 1 is rotated at the predetermined speed and a gear pump 6 is closed, an outer frame 27 and an output shaft 2 are rotated in the same direction and at the same speed with the input shaft 1. At this stage, a crown gear 42, which is provided in a shaft part 28b of the outer frame 27 and which can be freely rotated around a shaft core L3 of inclination inclined at the predetermined angle against the shaft core L, and an input crown gear 3 of a housing frame 4, which is housed in the crown gear and the outer frame of a first rotor, in which a second rotor 38 is fitted, are locked with each other. In this condition, when the gear pump 6 is opened, rotating speed of the outer frame 27 becomes lower than the rotating speed of the input shaft 1, and rotating speed of the output shaft 2 is lowered. When a casing 10 of the gear pump 6 is stopped, the output shaft 2 is stopped. The first and the second rotors 37, 38 are connected to each other through a joint part 41.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a transmission.

[0002]

2. Description of the Related Art Transmissions used in machine tools, industrial machines, construction machines, agricultural machines, vehicle machines, and the like have conventionally used a planetary gear device to transmit power 1/2 and a hydraulic device to transmit power 1/2. There was something. In this case, in general (because the gear pump cannot remove the oil, it is inefficient)
An axial plunger pump was used.

[0003]

However, the above-mentioned conventional device is susceptible to overload and difficult to control. Therefore, an object of the present invention is to provide a transmission that can extremely suppress the load applied to the pump and that is extremely efficient.

[0004]

SUMMARY OF THE INVENTION To achieve the above object, a transmission according to the present invention comprises a rotatable input shaft, a rotatable rotation about the same axis as the input shaft, and a rotation with respect to the axis.
An output shaft provided with first and second eccentric shaft portions having eccentric shaft centers disposed at 180 ° opposite positions, and an outer frame rotating integrally with the output shaft; A gear pump for changing the rotation speed to transmit the rotation from the input shaft to the outer frame; and a rotatable inner shaft portion of the outer frame around an inclined axis inclined at a predetermined angle with respect to the same axis. A crown gear externally fitted as a first rotating body, a first rotating body rotatably fitted to the first eccentric shaft portion of the output shaft, and a second rotating body rotatably fitted to the second eccentric shaft portion of the output shaft. And the input shaft,
An internal gear that is housed in the outer frame and in which the second rotator is internally fitted, and that meshes with the storage frame and an external gear provided on the second rotator; And an input crown gear meshing with the crown gear, and the first rotating body is provided with a crown gear meshing with the crown gear, and the first rotating body and the second rotating body are The first rotator is connected via a joint for transmitting the rotation of the first rotator to the second rotator. Further, the joint portion is preferably an Oldham joint.

[0005]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a transmission according to the present invention. The transmission includes an input shaft 1 that is rotatable and an output shaft 2 that is rotatable about the same axis L as the input shaft 1. The input shaft 1 is connected at its base end to a prime mover (not shown) and driven to rotate, and the output shaft 2 is connected at its tip end to a machine driven at variable speed. A large diameter portion 1a and a medium diameter portion 1b are provided at an end of the input shaft 1, and the large diameter portion 1a is provided with a second diameter portion to be described later.
A storage frame portion 4 in which the rotating body 38 is stored is formed. The storage frame portion 4 is provided with an internal gear 5 on an inner peripheral surface thereof, and an input crown gear portion 3 at an outer end thereof. .

The input shaft 1 has a gear pump 6
Is externally fitted. The gear pump 6 includes a first external gear 7 that rotates around the axis L integrally with the input shaft 1, a second external gear 8 that meshes with the first external gear 7, and first and second external gears 7, 8. A casing 10 having a storage chamber 9 surrounding the storage chamber 9, an oil suction path 11 and an oil discharge path 12 communicatively connected to the storage chamber 9,
Is provided.

That is, the first external gear 7 is connected to the input shaft 1 by a key or the like and rotates integrally, and the second external gear 8 is connected to the support shaft 14 (the shaft L and the shaft L) fixed by the casing 10. (With a parallel axis). Accordingly, the second external gear 8 is rotatable around the axis of the support shaft 14 and revolves around the axis L.

Accordingly, when the gears 7 and 8 mesh with each other, the volume of the space connected to and connected to the suction passage 11 increases, and oil is sucked from the suction passage 11 by a suction action due to a pressure drop. This oil is sequentially held in the tooth grooves of the gears 7 and 8 that rotate and is sent to the discharge path 12 side. Then, in the above-mentioned gap portion connected to the discharge passage 12, the volume is reduced by the meshing rotation of the gears 7 and 8, and the discharge passage is formed by the pushing action due to the increase in pressure.
Oil is discharged from 12.

That is, if the flow of the oil from the suction passage 11 to the discharge passage 12 is stopped to reduce the flow rate to zero while the input shaft 1 is being rotated, the second external gear 8 starts the meshing rotation (rotation). Without being raised, the first external gear 7 rotates (revolves) integrally with the casing 10 by the rotation of the first external gear 7.

In this state, if oil flows from the suction passage 11 to the discharge passage 12, the second external gear 8 rotates, and as the oil flow rate increases, the rotation of the second external gear 8 becomes faster. In turn, the revolution slows down the revolution, and the revolution can be stopped. When the revolution stops, the rotation of the casing 10 of the gear pump 6 stops. Reference numeral 13 denotes a pressure control flow control valve for controlling the flow rate of the gear pump 6.

By the way, the suction passage 11 is provided with a hole 15 of the casing 10, a hole 17 of the joint 16, and a pipe 20 connected to the joint 16.
The discharge path 12 includes a hole 18 of the casing 10, a hole 19 of the joint 16, and a pipe 21 connected to the joint 16. The joint 16 is rotatable relative to the casing 10. Then, even when the casing 10 is rotated by a peripheral groove or the like (not shown) without rotating the joint 16, the holes 15 to the pipe 20 and the holes 18 to the pipe 21 are always connected to each other.

An outer flange-shaped clutch portion (not shown) is provided on the base end side of the casing 10, and a clutch plate which can be pressed or separated from the clutch portion by manual or power drive is provided on the input shaft 1. It is fitted. That is, the clutch unit and the clutch plate constitute a friction clutch mechanism. The clutch plate can be rotated integrally with the input shaft 1 by a slide key or the like and is slidable in the axis L direction.

An outer frame 27 is connected to the gear pump 6. The outer frame 27 includes a pair of side walls 28 and 29 and the side walls 2 and 29.
And a peripheral wall 30 connecting the first and second side walls 29.
In addition, the gear pump 6 is integrally attached with a fixing tool 31 such as a bolt. The side wall 28 has a disk-shaped main body 28a.
And a cylindrical shaft portion 28b protruding from the main body portion 28a. The input shaft 1 is rotatably inserted into the hole 24 of one side wall 29, and the output shaft 2 is inserted into the hole 32 of the other side wall 28.
Is inserted and fixed. A weight body 52 is provided on the inner peripheral surface of the outer frame 27 to improve the dynamic balance of the entire transmission and suppress vibration during rotation.

Therefore, when the casing 10 of the gear pump 6 rotates, the outer frame 27 rotates and the output shaft 2 rotates. By the way, on the outer peripheral side of the outer frame 27, a friction member 43 which can be pressed against and separated from the outer peripheral surface of the outer frame 27 is provided, and a friction brake mechanism 44 for stopping the rotation of the outer frame 27 is configured.

Thus, the output shaft 2 has an axis L
First and second eccentric shaft portions 35 and 36 having eccentric shaft centers L ₁ and L ₂ disposed at 180 ° opposite positions are provided, and the first eccentric shaft portions are provided.
A first rotator 37 is rotatably fitted to the outside of the 35, and a second rotator 38 is rotatably fitted to the second eccentric shaft portion.
The end 2a of the output shaft 2 is connected to the blind hole 23 on the end of the input shaft 1.
And the input shaft 1 and the output shaft 2 are mutually rotatable.

The first rotating body 37 has a short cylindrical main body 37a.
And an outer flange portion 37b provided at the end of the main body portion 37a on the input shaft 1 side, and a crown gear portion 39 is provided on a surface of the outer flange portion 37b on the main body side. On the outer peripheral surface of the second rotating body 38, an external gear 40 meshing with the internal gear 5 of the storage frame 4 is provided. The first and second rotating bodies 37 and 38 are connected by a joint 41. In this case, an Oldham coupling was used as the coupling part 41.

The shaft portion 28b of the outer frame 27 has an axis L
Rotatable crown wheel 42 is attached to the tilt axis L ₃ around inclined at an angle to. That is, the crown gear 42 includes a short cylindrical main body 42a and an outer flange 42b provided at an end of the main body 42a on the input shaft 1 side, and the tooth 34 is formed on the outer surface of the outer flange 42b. Is provided. Then, the axis of the shaft portion 28b, and the inclined axis L ₃ inclined at an angle to the axis L, rotatably were fitted on the crown gear 42 through a bearing 33 on the shaft portion 28b Further, the teeth 34 are meshed with the crown gear 39 and the input crown gear 3.

Therefore, according to the transmission configured as described above, when the input shaft 1 is rotated at a predetermined speed and the gear pump 6 is closed, the outer frame 27 is also rotated in the same direction as the input shaft 1 at the same speed. Rotate with. That is, the output shaft 2 also rotates at the same speed in the same direction as the input shaft 1. At this time, the crown gear 42 and the crown gear portions 39 and 3 are locked. If the gear pump 6 is opened from this state, the rotation speed of the outer frame 27 becomes lower than the rotation speed of the input shaft 1. Eventually, the rotation speed of the output shaft 2 decreases. When the casing 10 of the gear pump 6 stops, the output shaft 2 stops.

Therefore, when the gear pump 6 is closed, the output shaft 2 rotates in the same direction as the input shaft 1 at the same speed, and when the gear pump 6 is opened, the rotation speed of the output shaft 2 gradually decreases, and finally Stops. At this time, if the friction member 43 of the friction brake mechanism 44 is pressed against the outer peripheral surface of the outer frame 27,
Stop reliably. When stopped, the outer frame 27 does not rotate, so there is no need to depress the brake pedal, and the output shaft 2 can be held stationary by using the power of the prime mover. As described above, the rotation speed of the output shaft 2 can be easily changed while the input shaft 1 is rotated at the predetermined rotation speed.

[0021]

Since the present invention is configured as described above, the following effects can be obtained.

According to the transmission of the first aspect, the load applied to the gear pump 6 can be extremely reduced, and most of the hydraulic pressure can be returned to the output shaft 2, so that the efficiency is high. The gear pump 6 has a simple structure and extremely high reliability. In addition, the rotation is reliably stopped, and the rotation can be reliably stopped without using a servo device or the like, and the engine brake is strong.

According to the transmission of the second aspect, the same effects as those of the transmission of the first aspect can be obtained, and the torque can be smoothly transmitted from the input shaft 1 to the output shaft 2.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Input shaft 2 Output shaft 3 Input crown gear 4 Storage frame 5 Internal gear 6 Gear pump 27 Outer frame 28 b Shaft 35 First eccentric shaft 36 Second eccentric shaft 37 First rotating body 38 Second rotating body 39 Crown gear part 40 External gear 41 Joint part 42 Crown gear L Same axis L ₁ Eccentric axis L ₂ Eccentric axis L ₃ Tilt axis

Claims (2)

[Claims] 1. An input shaft 1 which is rotatable, and eccentric shafts L ₁ and L ₂ which are rotatable about the same axis L as the input shaft 1 and are disposed at positions 180 ° opposite to the axis L. The first with
An output shaft 2 provided with second eccentric shaft portions 35 and 36, wherein the outer frame 27 rotates integrally with the output shaft 2.
A gear pump 6 that changes the rotation speed and transmits the rotation from the input shaft 1 to the outer frame 27; and a shaft portion 28b inside the outer frame 27 is inclined at a predetermined angle with respect to the same axis L. crown gear 42, which is fitted as rotatable tilt axis L ₃ around you
A first rotator 37 rotatably fitted to the first eccentric shaft 35 of the output shaft 2, a second rotator 38 rotatably fitted to the second eccentric shaft 36, And the input shaft 1 includes:
The storage frame 4 is housed in the outer frame 27 so that the second rotating body 38 is fitted inside the storage frame 4, and the storage frame 4 is provided with an external gear 40 provided on the second rotating body 38. The internal gear 5 meshing with the crown gear 42 and the input crown gear portion 3 meshing with the crown gear 42 are provided. The first rotating body 37 is provided with a crown gear portion 39 meshing with the crown gear 42. First rotator 37 and second
A transmission characterized in that the rotating body (38) is connected to the rotating body (38) via a joint (41) that transmits the rotation of the first rotating body (37) to the second rotating body (38). 2. The transmission according to claim 1, wherein said coupling portion is an Oldham coupling.