JPH08334151A - Transmission - Google Patents

Abstract

PURPOSE: To reduce a pump load by providing a gear tooth part with which a bevel gear tooth part is engaged on a first planetary gear 1, the bevel gear tooth part to engage with the first planetary gear and a spur gear part to engage with a rotor internal gear on a second planetary gear, a bevel gear tooth part with which the first planetary gear is engaged on a rotor and an input gear tooth part to engage with the second planetary gear on an input shaft. CONSTITUTION: When an input shaft 1 is rotated at specified speed and a gear pump is made in a closed state, a casing 10 is rotated in the same direction and at the same speed as the input shaft 1, a first bevel gear tooth part 5, first and second planetary gears 37, 36, an internal gear 40 of a rotor 38, a second bevel gear tooth part 41 and an input gear tooth part 3 of the input shaft 1 are locked, the second planetary gear 36 is revolved, and an output shaft 2 is rotated at the same number of rotation as the input shaft 1. When the gear pump 6 is made in an open state, rotating speed of the first bevel gear tooth part 5 and revolving speed of the second planetary gear 36 become slower than the input shaft 1, finally the first bevel gear tooth part 5 is stopped, the second planetary gear 36 is revolved in the reverse direction of the input shaft 1, and the output shaft 2 is rotated in the reverse direction of the input shaft 1. Consequently, it is possible to reduce a load of the gear pump 6.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a transmission.

[0002]

2. Description of the Related Art Conventionally, a transmission used in machine tools, industrial machines, construction machines, agricultural machines, vehicle machines, etc., transmits 1/2 power by a planetary gear unit and 1/2 by a hydraulic system. There was something. In this case, generally (because the gear pump has to remove the oil, it is inefficient)
I was using an axial plunger pump.

[0003]

However, the above-mentioned conventional devices are vulnerable to overload and difficult to control.

Therefore, it is an object of the present invention to provide a transmission that can suppress the load on the pump to an extremely low level and that is extremely efficient.

[0005]

In order to achieve the above object, a transmission according to the present invention is a transmission having an input shaft and an output shaft which are rotatably supported on the same shaft center. A gear pump having a first bevel gear portion externally fitted to the input shaft and changing a rotation speed to transmit the rotation from the input shaft to the first bevel gear portion; and a hollow shaft on the output shaft. A rotating body having a shaft portion rotatably fitted to the outside and having an internal gear; and a shaft rotatable about an orthogonal shaft center orthogonal to the shaft center and revolving around the shaft center around the output shaft. And a second planetary gear that is rotatable about a parallel axis parallel to the axis and revolves around the axis to rotate the output shaft about the axis. , The first planetary gear is provided with first and second tooth portions in which the first bevel gear portion meshes with either one. The second planetary gear is provided with a bevel gear portion that meshes with a first tooth portion of the first planetary gear and a spur gear portion that meshes with an internal gear of the rotating body. The first bevel gear is provided with a second bevel tooth portion which meshes with the second tooth portion, and the input shaft is provided with an input tooth portion which is meshed with the spur gear portion of the second planetary gear.

[0006]

If the first bevel gear portion of the gear pump is stopped while the input shaft is rotating, the rotation of the input shaft causes the second planetary gears to rotate about the axis of the input shaft. If the second planetary gear revolves in the opposite direction and revolves around the axis of the input shaft, the output shaft supporting this second planetary gear rotates around the center of the axis in the opposite direction to the rotation of the input shaft. Will be done.

If the first bevel gear portion of the gear pump is made to rotate integrally with the input shaft in the same direction while the input shaft is rotating, the first tooth portion of the first planetary gear unit. And the second
Meshing with the bevel gear portion of the planetary gear, meshing with the first tooth portion (or second tooth portion) of the first planetary gear and the first bevel gear portion,
Also, the engagement between the spur gear portion of the second planetary gear and the spur gear portion of the input shaft becomes a locked state, and the input shaft and the output shaft rotate integrally in the same direction.

Then, when the rotation speed of the first bevel gear portion is reduced from the rotation speed of the input shaft by the gear pump while the input shaft is rotating, it rotates at the same speed as the input shaft. The output shaft gradually slows down.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing embodiments.

FIG. 1 shows a transmission according to the present invention. This transmission has an input shaft 1 rotatably supported on the same axis L.
And an output shaft 2. The input shaft 1 is connected at its base end side to a motor or the like (not shown) for rotation, and the output shaft 2 is connected at its tip end side to a machine for variable speed drive.

The input shaft 1 is provided with an input tooth portion 3 at its tip and a protrusion 4 at its tip. A gear pump 6 having a first beveled tooth portion 5 is externally fitted on the input shaft 1.

The gear pump 6 includes a first external gear 7 that rotates integrally with the input shaft 1 about an axis L, a pair of second external gears 8 that mesh with the first external gear 7, and a first external gear. 2 A casing 10 having a storage chamber 9 surrounding the external gears 7 and 8
And an oil suction path 11 and an oil discharge path that are connected to the storage chamber 9 for communication.
12 and.

That is, the first external gear 7 is connected to the input shaft 1 by a key or the like to rotate integrally, and the second external gear 8 is connected to the support shaft 14 (the shaft L and It has a parallel shaft center) and is rotatably fitted to the outside. Therefore, the second external gear 8 is rotatable about the axis of the support shaft 14 and revolving around the axis L.

Further, voids are formed in the portions where the first external gear 7 and the second external gear 8 start to mesh with each other and where the meshing is separated. Then, the void portion where the meshing of the first external gear 7 and the one second external gear 8 starts and the void portion of the portion where the meshing of the first external gear 7 and the other second external gear 8 separates are connected. So that the inner surface of the storage chamber 9
The tooth tops of the first external gear 7 and the tooth tops of the second external gears 8, 8 are brought into close proximity to or in sliding contact with each other.

Further, the first external gear 7 and the second external gear 8 on one side are communicated and connected with the gap portion where the meshing of the second external gear 8 and the second external gear 8 is on the other side. The discharge passage 12 is communicated and connected with the void portion at the portion where the meshing of (1) starts.

Therefore, when the gears 7 and 8 rotate in mesh with each other, the volume of the above-mentioned void portion communicating with the suction passage 11 increases, and the suction action due to the pressure decrease causes the oil to be sucked from the suction passage 11. This oil is sequentially held in the tooth spaces of the gears 7, 8 and 8 that rotate in mesh with each other and sent to the discharge passage 12 side. Then, in the above-mentioned gap portion which is connected to the discharge passage 12, the volume is reduced by the meshing rotation of the gears 7 and 8, and the oil is discharged from the discharge passage 12 by the pushing action due to the increase in pressure.

That is, when the input shaft 1 is rotated and the flow of oil from the suction passage 11 to the discharge passage 12 is stopped to make the flow rate zero, the second external gears 8, 8 rotate in mesh (rotate). ), The first external gear 7 rotates (revolves) integrally with the casing 10 by the rotation of the first external gear 7, whereby the first bevel gear portion 5 is
It rotates around the axis L in the same direction and at the same speed as the input shaft 1.

If the oil is allowed to flow from the suction passage 11 to the discharge passage 12 from this state, the second external gears 8, 8 will rotate, and as the oil flow rate increases, the second external gear 8,
The rotation of No. 8 becomes faster, and conversely, the rotation becomes slower, and this rotation can be stopped. When the revolution stops, the rotation of the casing 10 of the gear pump 6 stops. Reference numeral 13 is a pressure-guaranteed flow rate control valve for controlling the flow rate of the gear pump 6.

By the way, the suction passage 11 has a hole 15 in the casing 10, a hole 17 in the joint 16 and a pipe 20 connected to the joint 16.
The discharge passage 12 is composed of 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. The joint 16 does not rotate, and even if the casing 10 rotates due to a peripheral groove (not shown) or the like, the hole 15 to the pipe 20 and the hole 18 to the pipe 21 are always continuously connected to each other.

An outer brim-shaped clutch portion 23 is provided at the base end of the casing 10, and the input shaft 1 is provided with a clutch plate which can be pressure-contacted and separated from the clutch portion 23 by manual or power drive.
25 is fitted. That is, the clutch portion 23 and the clutch plate
A friction clutch mechanism 26 is constituted by 25. The clutch plate 25 can rotate integrally with the input shaft 1 by a slip key or the like and can slide in the direction of the axis L.

Further, in correspondence with the outer peripheral surface 10a of the casing 10 (corresponding to the accommodating chamber 9), a friction member 27 which can be pressure-contacted and separated is provided on the outer peripheral surface 10a, and a reversing friction brake mechanism 28 is constituted. To be done.

An outer flange portion 30 is provided at the input shaft-corresponding end portion of the output shaft 2, and a disk body 31 facing the outer flange portion 30 is connected via the connecting shafts 32 and 32. It is connected to the outer collar portion 30. A fitting portion 33 is provided on the end surface of the disc body 31 so as to project therefrom.

A blind hole 34 is provided on the end surface of the output shaft 2, and the projection 4 of the input shaft 1 is rotatably inserted into the blind hole 34, and the input shaft 1 is inserted into the hole 35 of the disk body 31. Is rotatably inserted.

A second planetary gear 36 is rotatably (rotatably) fitted on the connecting shaft 32. The connecting shaft 32
Is arranged parallel to the above-mentioned axis L, and the second planetary gear 36 is rotatable about a parallel axis L ₂ parallel to the axis L.

The second planetary gear 36 has the input tooth portion 3 of the input shaft 1.
And a bevel gear portion 36a that meshes with a first tooth portion 37a of a first planetary gear 37 described later.

Therefore, when the output shaft 2 rotates about the axis L, the second planetary gear 36 revolves around the axis L.
In other words, if the second planetary gear 36 revolves around the axis L, the output shaft 2 rotates around the axis L.

Therefore, the output shaft 2 is provided with a rotating body 38 to which a hollow shaft portion 38a is rotatably fitted. That is, the rotating body 38 includes the hollow shaft portion 38a and a large-diameter cylindrical portion 38b having a diameter larger than that of the hollow shaft portion 38a. The large-diameter cylindrical portion 38b has an inner peripheral surface on which a second planetary gear is provided. An internal gear 40 that meshes with the spur gear portion 36b of 36 is provided, and a second bevel tooth portion 41 that meshes with the second tooth portion 37b of the first planetary gear 37 is provided on the end surface thereof.

The first planetary gear 37 is provided with a first tooth portion 37a and a second tooth portion 37b having different inclination angles, and is rotatably supported about an orthogonal axis L _{1 which} is orthogonal to the axis L. ing.

That is, a disk-shaped base plate 42 is fitted onto the input shaft 1, and shaft parts 43, 43 are provided on the base plate 42 so as to project therefrom.
The first planetary gears 37, 37 are rotatably fitted to the outer parts 43, 43. A fitting hole portion 44 is provided in the board 42, and the fitting portion 33 of the output shaft 2 is fitted into the fitting hole portion 44.
Therefore, the rotation of the substrate 42 causes the first planetary gear 37 to move to the axis L.
The output shaft 2 rotates while rotating around.

By the way, the first tooth portion of the first planetary gear 37
The first bevel gear portion 5 of the gear pump 6 is meshed with 37a as shown by the solid line, but as shown by the phantom line, the first bevel gear portion 5 is the second tooth portion of the first planetary gear 37. May mesh with 37b.

The first and second planetary gears 37, 36, etc. are the hollow shaft portion 38a of the casing 10 of the gear pump 6 and the rotating body 38.
It is installed in an outer frame 45 that is rotatably pivoted to. That is, the outer frame 45 includes a pair of side walls 46 and 47 and a peripheral wall 48 connecting the side walls 46 and 47, and the shaft 43 of the substrate 42 is provided on the peripheral wall 48.
End portion 43a is inserted and fixed, the hollow shaft portion 38a of the rotating body 38 is relatively rotatably inserted into the hole portion 46a of the side wall 46, and the casing 10 of the gear pump 6 is inserted into the hole portion 47a of the side wall 47.
Is relatively rotatably inserted. Therefore, the outer frame 45 rotates integrally with the rotation of the substrate 42.

On the outer peripheral side of the outer frame 45, the outer peripheral surface 45 of the outer frame 45 is provided.
a, that is, the outer peripheral surface of the peripheral wall 48 is provided with a friction plate 50 which can be pressure-contacted and separated, and a stopping brake mechanism 51 is configured.

Then, the second tooth portion 37b of the first planetary gear 37 is formed.
The extension line M ₁ of the meshing point at which the rotary shaft 38 and the second beveled tooth portion 41 of the rotary body 38 mesh at the intersection O ₁ of the axis L and the orthogonal axis L _1, and the first tooth of the first planetary gear 37. The extension line M ₂ of the meshing point where the portion 37a meshes with the bevel tooth portion 36a of the second planetary gear 36 intersects at the intersection O ₂ of the parallel axis L ₂ and the orthogonal axis L ₁ . Of course,
The extension line M ₂ ′ of the meshing point where the first tooth portion 37a of the first planetary gear 37 and the first bevel gear portion 5 mesh with each other intersects at an intersection point O ₂ .

Therefore, according to the transmission constructed as described above, when the input shaft 1 is rotated at a predetermined speed and the gear pump 6 is closed, the casing 10 moves in the same direction and at the same speed as the input shaft 1. Rotate. And casing 10
Is rotated in the same direction and at the same speed as the input shaft 1, the first
A bevel gear portion 5, a first planetary gear 37, a second planetary gear 36,
The internal gear 40 and the second beveled tooth portion 41 of the rotating body 38, and the input shaft 1
The input tooth portion 3 of and the
Since 36 revolves without rotating, the output shaft 2 has the same rotation speed as the input shaft 1.

From this state, if the gear pump 6 is opened, the rotational speed of the first beveled tooth portion 5 lags behind the input shaft 1. That is, the first and second planetary gears 37 and 36 are rotated, and the revolution speed of the second planetary gear 36 becomes slower than that of the input shaft 1. Finally, the rotation of the first beveled tooth portion 5 is stopped.

When the rotation of the first bevel gear portion 5 is stopped, the second planetary gear 36 revolves around the axis L in the direction opposite to the rotation direction of the input shaft 1, and the output shaft 2 is rotated by the input shaft 1. And rotate in the opposite direction.

Therefore, if the gear pump 6 is closed, the input shaft 1 and the output shaft 2 rotate integrally in the same direction at the same speed regardless of the rotation speed of the prime mover that rotates the input shaft 1, and the gear pump 6 is rotated. When the oil is released, the outer frame 45 stops due to natural oil outflow, and the output shaft 2 that rotates in the same direction as the outer frame 45 also stops. At this time, if the friction plate 50 of the stopping brake mechanism 51 is brought into pressure contact with the outer peripheral surface 45a of the outer frame 45, the stop is surely performed. If stopped, the outer frame 45 will not rotate,
You don't have to step on the brake pedal.

By the way, when moving backward, that is, when the output shaft 2 is rotating in the reverse direction, the casing 10 of the gear pump 6 is stopped. At this time, if the friction member 27 of the brake mechanism 28 is brought into pressure contact with the outer peripheral surface of the casing 10, the brake mechanism 28 reliably stops. When stopped, the casing 10 does not rotate, so there is no need to step on the brake pedal. By the way, the above operation can be performed by servo control or automatic control by a microcomputer or the like.

The number of the first and second planetary gears 37 and 36 can be freely changed, but it is preferable that there are at least two each. In addition, the first and second planetary gears 37, 36
The number of teeth, etc. can be changed freely.

[0040]

Since the present invention is configured as described above, it has the following effects.

The load applied to the gear pump 6 can be suppressed to an extremely low level (about 1/10 of the conventional value), and most of the hydraulic pressure can be returned to the output shaft 2, which is efficient. Further, the gear pump 6 has a simple structure and has extremely high reliability.

[Brief description of drawings]

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

[Explanation of symbols]

1 Input shaft 2 Output shaft 5 1st bevel gear part 6 Gear pump 36 2nd planetary gear 36a Bevel gear part 36b Spur gear part 37 1st planetary gear 37a 1st tooth part 37b 2nd tooth part 38 Rotating body 38a Hollow shaft part 40 Internal gear 41 2nd bevel tooth L axis center L ₁ orthogonal axis center L ₂ parallel axis center

Claims (1)

[Claims] 1. In a transmission including an input shaft 1 and an output shaft 2 which are rotatably supported on the same axis L, a first bevel gear portion 5 fitted onto the input shaft 1 in a transmission. And a gear pump 6 for transmitting the rotation from the input shaft 1 to the first bevel gear 5 by changing the rotation speed, and a hollow shaft 38a rotatably fitted on the output shaft 2. Rotating body having internal gear 40
38, and is rotatable about an orthogonal axis L ₁ orthogonal to the axis L and revolves around the axis L to rotate the output shaft 2 to the axis L.
A first planetary gear 37 that rotates about the axis L and a first planetary gear 37 that is rotatable about a parallel axis L ₂ parallel to the axis L and revolves around the axis L to rotate the output shaft 2 about the axis L. A second planetary gear 36, and the first planetary gear 37 is provided with first and second tooth portions 37a, 37b in which the first bevel gear portion 5 meshes with at least one of the two. Planetary gear 36
Is provided with a bevel tooth portion 36a that meshes with the first tooth portion 37a of the first planetary gear 37 and a spur gear portion 36b that meshes with the internal gear 40 of the rotating body 38. Further, the rotating body 38, A second bevel tooth portion 41 with which the second tooth portion 37b of the first planetary gear 37 meshes is provided, and an input tooth portion 3 that meshes with the spur gear portion 36b of the second planetary gear 36 is provided on the input shaft 1. A transmission characterized by being provided.