JP2862497B2 - transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention 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.

[0004] Therefore, an object of the present invention is to provide a transmission that can extremely suppress the load on the pump and that is extremely efficient.

[0005]

In order to achieve the above object, one transmission according to the present invention comprises a rotatable input shaft, a rotatable input shaft and a rotatable shaft around the same axis. An output shaft provided with first and second eccentric shaft portions having eccentric shaft centers disposed at positions 180 ° opposite to each other with respect to the center, wherein the outer frame rotates integrally with the output shaft. And a gear pump that changes the rotation speed and transmits rotation from the input shaft to the outer frame, and is rotatably fitted on a perpendicular axis orthogonal to the axis and rotates with the outer frame. A bevel gear that revolves around the axis, a first rotator that is rotatably fitted to the first eccentric shaft of the output shaft, and a second rotator that is rotatably fitted to the second eccentric shaft. A rotating frame, wherein the input shaft forms a storage frame portion in which the second rotating body is fitted. An inner gear meshing with an external gear provided on the second rotating body, and an external bevel gear meshing with the bevel gear provided on the receiving frame portion, and the bevel gear is provided on the first rotating body. Is provided with an internal beveled tooth portion,
The first rotator and the second rotator are connected via a joint for transmitting the rotation of the first rotator to the second rotator.

Another transmission according to the present invention comprises a rotatable input shaft and an eccentric shaft rotatable about the same axis as the input shaft and disposed at a position 180 degrees opposite to the axis. An output shaft provided with first and second eccentric shaft portions having a center, wherein an outer frame rotating integrally with the output shaft, and rotation of the input shaft is transmitted to an input gear. An axial plunger pump that transmits the rotation from the output gear to the spur gear that rotates integrally with the output shaft by changing the rotation speed thereof, and is rotatably fitted to the orthogonal axis orthogonal to the axis. A bevel gear that revolves around the axis with the rotation of the outer frame, a first rotating body rotatably fitted around a first eccentric shaft portion of the output shaft, and a second rotating body of the output shaft. A second rotating body rotatably fitted to the eccentric shaft portion,
The input shaft is provided with a storage frame part in which the second rotating body is fitted inside, and the storage frame part is provided with the second frame.
An internal gear that meshes with the external gear provided on the rotating body, and an external bevel gear that meshes with the bevel gear are provided, and the internal bevel gear with which the bevel gear meshes with the first rotary body is provided. The first rotating body and the second rotating body,
In addition to the spur gear, a control bevel gear meshing with the bevel gear is connected to the spur gear, while being interlockingly connected via a joint for transmitting the rotation of the rotator to the second rotator.

[0007]

According to the first aspect of the present invention, if the outer frame is stopped by the gear pump while the input shaft is rotating, the bevel gear is rotated with the rotation of the input shaft. The first rotating body rotates around the first eccentric axis, the second rotating body rotates around the second eccentric axis, and the output shaft is stopped.

Further, if the outer frame is rotated integrally with the input shaft in the same direction by the gear pump while the input shaft is rotating, the outer bevel gear of the input shaft and the first rotating body are provided. The bevel gear meshing with the inner bevel teeth revolves around the axis (the axis of the input shaft and the output shaft) without rotating, and the output shaft rotates in the same direction and at the same speed as the input shaft. .

When the rotation speed of the outer frame is reduced by the gear pump while the input shaft is rotating, the output shaft rotating at the same speed as the input shaft is reduced. Decelerate sequentially.

Next, with the input shaft rotating, the axial plunger pump rotates the spur gear in the same direction and at the same speed as the input shaft while the input shaft is rotating. Then, the output shaft also rotates at the same speed in the same direction as the input shaft. That is, with the rotation of the spur gear, the bevel gear revolves around the axis (the axis of the input shaft and the output shaft) without rotating, and the outer frame supporting the bevel gear also rotates.

If the rotational speed of the spur gear is reduced more than the rotational speed of the input shaft, the difference in speed causes the bevel gear meshing with the spur gear to rotate in addition to revolving. The outer frame supporting the gears also decelerates. Therefore, the output shaft will rotate slower than the input shaft.

[0012]

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. 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
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 provided with an external bevel tooth portion 3 at an outer end thereof. .

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

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 center 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.

A gap is formed at each of a portion where the first external gear 7 and the second external gear 8 start meshing and a portion where the meshing is separated. The gap where the engagement of the first external gear 7 and one of the second external gears 8 starts, and the gap where the engagement of the first external gear 7 and the other second external gear 8 are separated from each other are connected. Thus, the inner surface 9a of the storage room 9
Are brought into close or sliding contact with the tooth tips of the first external gear 7 and the tooth tips of the second external gears 8 and 8, respectively.

Further, the suction passage 11 is communicatively connected to a gap portion where the first external gear 7 and one of the second external gears 8 are disengaged from each other, and the first external gear 7 and the other second external gear 8 are connected. And the discharge passage 12 is communicated and connected with the gap at the part where the meshing of the two starts.

Accordingly, when the gears 7 and 8 mesh with each other and rotate, the volume of the gap portion connected to the suction passage 11 increases, and oil is sucked from the suction passage 11 by a suction effect due to a pressure decrease. This oil is successively held in the tooth grooves of the gears 7, 8, 8 which are engaged and rotated and sent to the discharge path 12 side. Then, in the gap portion connected to the discharge path 12, the volume is reduced by the meshing rotation of the gears 7 and 8, and the oil is discharged from the discharge path 12 by a pushing action due to an increase in pressure.

That is, if the flow of 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 rotated, the second external gears 8 and 8 rotate in mesh with each other (rotational rotation). ), The first external gear 7 rotates (revolves) integrally with the casing 10 by rotation of the first external gear 7.

In this state, if the oil flows from the suction passage 11 to the discharge passage 12, the second external gears 8, 8 will rotate, and as the oil flow rate increases, the second external gears 8, 8 will increase.
The rotation of 8 is accelerated, and the rotation is conversely slowed down by the rotation, and this 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.

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 collar-shaped clutch portion 23 is provided at the base end of the casing 10, and a clutch plate which can be pressed and separated from the clutch portion 23 by manual or power drive is provided on the input shaft 1.
25 are fitted externally. That is, the clutch portion 23 and the clutch plate
25 constitutes a friction clutch mechanism 26. The clutch plate 25 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,
A side wall 29 is integrally attached to the casing 10 of the gear pump 6 by a fixing tool 31 such as a bolt. Then, the hole 32 of the other side wall 28
The input shaft 1 is rotatably inserted into the hole 24 of one of the side walls 29. The outer frame 27
A weight body 52 is provided on the inner peripheral surface of the transmission 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. The side wall 29 includes a disk-shaped main body 29a and a cylindrical part 29b protruding from the main body 29a. The outer peripheral side of the cylindrical part 29b is pressed against and separated from the outer peripheral surface of the cylindrical part 29b. Flexible friction member
The friction brake mechanism 34 for stopping the rotation of the casing 10 is provided.

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.
Then, the end 2a of the output shaft 2 is fitted into the middle diameter portion 1b 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,
An outer flange portion 37 provided at an end of the body portion 37a on the input shaft 1 side.
and an inner beveled tooth portion 39 on the outer peripheral edge of the outer flange portion 37b.
Is provided.

The second rotating body 38 includes a large-diameter portion 38a and a small-diameter portion 38b, and an external gear 40 is provided on the outer peripheral surface of the large-diameter portion 38a. The external gear 40 meshes with the internal gear 5 of the storage frame 4.

The first and second rotating bodies 37 and 38 are connected to a joint portion.
Connected at 41. In this case, as the joint 41,
Oldham couplings were used.

The outer frame 27 is provided with a bevel gear 42 which is rotatable around a perpendicular axis L ₃ perpendicular to the axis L. That is, a support piece 43 is provided on the side wall 28 of the outer frame 27, and a shaft 44 is supported by the support piece 43 and the peripheral wall 30. A bevel gear 42 is rotatably fitted on the shaft 44.

The outer bevel gear 3 of the input shaft 1 and the inner bevel gear 39 of the first rotating body 37 mesh with the bevel gear 42.
In addition, a notch 45 in the circumferential direction is formed at the opening edge of the storage frame 4.
The notch 45 is provided with an outer flange portion of the first rotating body 37.
37b is a fitting shape. That is, the outer flange portion 37b is held by the opening edge of the storage frame portion 4 and the bevel gear 42 in a sandwiched state.

By the way, the extension line M ₁ of the mesh point where the bevel gear 42 and the internal bevel gear 39 mesh with each other intersects with an intersection O ₁ connecting the orthogonal axis L ₃ and the eccentric axis L ₁ . Further, the extension line M ₂ of the engagement point where the bevel gear 42 and the outer bevel portion 3 of the housing frame portion 4 meshes intersect with the axis L and the intersection O _2.

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 moved 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 bevel gear 42 and the inner and outer bevel teeth 39, 3
, The bevel gear 42 revolves around the axis L without rotating. When the gear pump 6 is opened from this state, the rotation speed of the outer frame 27 is reduced to the input shaft 1.
, And the rotation speed of the output shaft 2 becomes slower. At this time, the bevel gear 42 revolves while rotating.

When the casing 10 of the gear pump 6 stops, the output shaft 2 stops. In this case, the bevel gear
42 only rotates without revolving.

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 33 of the friction brake mechanism 34 is pressed against the outer peripheral surface of the cylindrical portion 29b of the side wall 29 of the outer frame 27, the operation is reliably stopped. If stopped, outer frame 27
Does not rotate, so there is no need to step on the brake pedal.

As described above, the rotation speed of the output shaft 1 can be easily changed while the input shaft 1 is rotated at the predetermined rotation speed.

FIG. 2 shows another embodiment. In this case, an axial plunger pump 106 is used instead of a gear pump as a transmission means. In this case, similarly to the input shaft 1 of the transmission shown in FIG. 1, the input shaft 101 has a large diameter portion 101a and a medium diameter portion 101b.
This constitutes a storage frame portion 104 for storing the second rotating body 138.

An inner gear 105 is provided on the inner peripheral surface of the storage frame 104, and the inner gear 105 has a medium diameter portion 101.
b, so that the circumscribed gear 14 of the second rotating body 138
0 is provided on the middle diameter portion 101b side correspondingly.

The output shaft 102 is connected to the axis L by 1
_First and _second eccentric shaft centers L ₁ and L ₂ at opposite positions by 80 degrees
It has eccentric shaft portions 135 and 136, a first rotating body 137 is rotatably fitted to the first eccentric shaft portion 135, and a second rotating body 138 is rotatably fitted to the second eccentric shaft portion 136. , Its end 102a
Is rotatably fitted into the middle diameter portion 101b of the input shaft 101.

The first rotating body 137 and the second rotating body 138 are connected via a joint 141. In this case, the joint
141 is a spur gear 49 rotatably fitted to an intermediate shaft 50 formed between the first eccentric shaft 135 and the second eccentric shaft 136.
And the right half of the spur gear 49 is a concave portion of the second rotating body 138.
48, and the left half of this spur gear 49 is the first rotating body.
137 is fitted into the recess 47. And the first rotating body 13
The concave portion 47 of FIG. 7 is provided with a tooth portion 46 that meshes with the spur gear 49, and the concave portion 48 of the second rotating body 138 is provided with a tooth portion 51 that meshes with the spur gear 49.

The first rotating body 137 has an inner bevel 139.
An outer bevel gear 103 is provided on the storage frame part 104, and a bevel gear 142 meshing with the inner bevel gear part 139 and the outer bevel gear part 103 is mounted on an outer frame 127 which rotates integrally with the output shaft 102. It is attached.

That is, the outer frame 127 is provided with the output shaft 102 in the hole 132.
Is inserted and fixed, a side wall 129 through which the input shaft 101 is rotatably inserted into the hole 124, a side wall 128 and a side wall 129.
A bevel gear 142 is rotatable around an orthogonal axis L ₃ orthogonal to the axis L and revolves around the axis L on a shaft 144 provided on the outer frame 127. It is pivoted.

Thus, an axial plunger pump
106 has an input gear 60 and an output gear 61,
The idle gear 62 meshes with a gear 63, and the idle gear 62 meshes with a gear 63 that rotates integrally with the input shaft 101.

The output gear 61 meshes with a spur gear 65 provided on a cylindrical body 64 externally fixed to the output shaft 102. By the way, the axial plunger pump 106 is
By controlling the respective inclination angles of the inclined plate 66 on the input gear 60 side and the inclined plate 67 on the output gear 61 side, the rotational speed of the input gear 60 and the rotational speed of the output gear 61 can be changed.

The cylindrical body 64 is provided with a control bevel gear 68 that meshes with the bevel gear 142. Therefore,
The bevel gear 68 rotates when the output gear 61 of the axial plunger pump 106 rotates.

A circumferential notch 145 is provided at the opening edge of the storage frame 104, and the notch 145 has a first notch.
The outer flange portion 137b of the rotating body 137 is fitted to the outer flange portion 137b.
37b is held by the opening edge of the storage frame 104 and the bevel gear 142 in a clamped state.

Also in this case, the extension line M ₁ intersects at the intersection O ₁ connecting the orthogonal axis L ₃ and the eccentric axis L _1, and the extension line M ₂ intersects the axis L at the intersection O ₂ .

Therefore, according to the transmission configured as described above, when the input shaft 101 is rotated at a predetermined speed and the rotation speed of the output gear 61 is maximized, the spur gear 65 and the bevel gear 68 are connected to the input shaft 101. It rotates at the same speed in the same direction as 101. At this time, the bevel gear 142 revolves around the axis L without rotating, that is, the outer frame 127 rotates in the same direction as the input shaft 101 at the same speed, and the output shaft 102 also rotates in the same direction as the input shaft 101. Rotate at the same speed.

In this state, by controlling the axial plunger pump 106 to reduce the rotation speed of the output gear 61, the difference in speed from the input shaft 101 causes the bevel gear 142 to rotate.
Performs rotation orthogonal axis L ₃ around with the revolution of the axis L around. That is, the outer frame 127 rotates slower than the speed of the input shaft 101, and the output shaft 102 rotates slower than the input shaft 101.

Therefore, the axial plunger pump 10
6 to change the rotation speed of the output gear 61, the output shaft
The rotation speed of the input shaft 102 with respect to the input shaft 101 can be changed steplessly. Specifically, the output shaft 102 is rotated at the same speed in the same direction as the input shaft 101 in the same direction as the input shaft 101.
2, the output shaft 102 is stopped, the output shaft 102 is reversed, and the input shaft 101 can be rotated at the same speed in the opposite direction.

[0051]

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 on 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.

According to the transmission of the second aspect, the characteristics of the axial plunger pump 106 can be fully utilized to achieve high efficiency, easy control, and reliable gear shifting.

[Brief description of the drawings]

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

FIG. 2 is a sectional view showing another embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Input shaft 2 Output shaft 3 Externally beveled tooth part 4 Storage frame part 5 Internal gear 6 Gear pump 27 Outer frame 35 1st eccentric shaft part 36 2nd eccentric shaft part 37 1st rotating body 38 2nd rotating body 39 Inner beveled tooth Part 40 External gear 41 Joint 42 Bevel gear 60 Input gear 61 Output gear 65 Spur gear 68 Control bevel gear 101 Input shaft 102 Output shaft 103 External bevel gear 104 Storage frame 105 Internal gear 106 Axial plunger pump 127 Outer frame 135 1st eccentric shaft section 136 2nd eccentric shaft section 137 1st rotating body 138 2nd rotating body 139 Inner bevel gear part 140 External gear 141 Joint part 142 Bevel gear L axis L ₁ Eccentric axis L ₂ Eccentric axis L ₃ orthogonal axes

Claims (2)

(57) [Claims] An input shaft (1) rotatably provided on the input shaft (1).
Eccentric shafts (L ₁ , L ₂ ) rotatable about the same shaft center (L) and disposed at a position 180 ° opposite to the shaft center (L).
Output shaft 2 provided with first and second eccentric shaft portions (35, 36) having
And an outer frame (27) that rotates integrally with the output shaft (2), and a rotation speed changed from the input shaft (1) to the outer frame (27). Gear pump for transmitting rotation (6)
And an orthogonal axis (L3) orthogonal to the axis (L). A bevel gear (42) rotatably fitted on the outer frame and revolving around the axis (L) with the rotation of the outer frame (27);
(2) a first rotating body (37) rotatably fitted to the first eccentric shaft (35), and a second rotating body rotatably fitted to the second eccentric shaft (36). (38), and a storage frame (4) in which the second rotating body (38) is fitted inside is formed on the input shaft (1), and the storage frame (4) is formed on the input shaft (1). An internal gear (5) meshing with an external gear (40) provided on the second rotating body (38);
An outer bevel gear (3) meshing with the bevel gear (42); and an inner bevel gear (39) meshing with the bevel gear (42) on the first rotating body (37). , And the first rotating body
(37) and the second rotating body (38) are connected via a joint (41) for transmitting the rotation of the first rotating body (37) to the second rotating body (38). transmission. 2. A rotatable input shaft (101) and said input shaft (1).
Eccentric shafts (L ₁ , L ₁ ) which are rotatable about the same axis (L) as that of (01) and are disposed at 180 ° opposite positions with respect to the axis (L).
L ₂ ) provided with first and second eccentric shaft portions (135, 136) having an eccentric shaft portion (135, 136).
(102) and an outer frame (127) that rotates together with the input shaft (10
An axial plunger pump that transmits the rotation of 1) to the input gear 60 and changes the rotation speed to transmit the rotation from the output gear (61) to the spur gear 65 that rotates integrally with the output shaft (102). (106) and an orthogonal axis (L ₃ ) orthogonal to the axis (L).
27), the bevel gear (142) revolving around the axis (L) with the rotation of the first eccentric shaft (13) of the output shaft (102).
5) a first rotating body (137) rotatably fitted to the outside, and a second rotating body (138) rotatably fitted to the second eccentric shaft (136) of the output shaft (102). The input shaft (101)
The storage frame (1) into which the second rotating body (138) is fitted
04), and the second frame is attached to the storage frame (104).
An internal gear (105) meshing with an external gear (140) provided on the rotating body (138), and an external bevel gear (103) meshing with the bevel gear (142) are provided. The first rotating body (137) is provided with an inner bevel gear (139) meshed with the bevel gear (142), and the first rotating body (137) and the second rotating body (138) are further provided.
And the rotation of the first rotating body (137) is changed to the second rotating body (138).
And interlocking connection via the joint (141)
A transmission characterized in that a control bevel gear (68) meshing with the bevel gear (142) is connected to the spur gear (65).