JPH0626562A - Mechanical-hydraulic transmission - Google Patents

Abstract

PURPOSE:To reduce the extent of noise by using plural pieces of planetary rollers pivoted aslant to a fange outer circumference of a power transmission shaft, a tube concentrically locked to a control gear externally fitted in these rollers and a sun roller detachable to a planetary roller inner circumference in this tube. CONSTITUTION:Rotation of an input shaft 1 at an HS mode rotates a fixed hydraulic unit 17 through discharge oil in a quantity conformed a position of a stroke control means 19 from a variable hydraulic unit 16, and an output shaft 15 rotates via a control gear 11, a clutch means 38 and a turning shaft 28. Likewise, rotation of the input shaft 1 at an HM mode rotates a tube 26 of the control gear 11, a power transmission shaft 8 and a flange 9 from the fixed hydraulic unit 17, and since each outer circumference of a guide ring 27 of the tube 26 and a sun roller 29 come into contact with two planetary rollers of plural fulcrum shafts 24 installed in this outer circumference of the flange 9 projectingly, rotational speed in the sun roller 9 canes to a resultant speed of the flange 9 and the tube 26, thus it is transmitted to the output shaft 15 via the turning shaft 28. In this constitution, the extent of noise is reduced, while one clutch is omittable, thereby simplifying the structure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydrostatic transmission (HST) and a mechanical hydraulic transmission in which a mechanical differential is added.

[0002]

2. Description of the Related Art This type of mechanical-hydraulic transmission is called a dual mode transmission (DMT) and is more stable in a low speed range in a hydro static mode (HMT).
Power is hydraulically transmitted in the S mode) and mechanically transmitted in the hydro-mechanical mode (HM mode) in the medium and high speed ranges to improve the power transmission efficiency. As such a DMT, the one shown in FIG. 2 has recently been proposed by the applicant although it has not been published yet (Japanese Patent Application No. 3-637497). This transmission includes an HST 5 provided on a variable unit shaft 4 connected to an input shaft 1 via gears 2 and 3, and a power transmission shaft 8 connected to the variable unit shaft 4 via gears 6 and 7. A plurality of support shafts 4 projecting from the outer periphery of the flange 9 at the rear end of the power transmission shaft 8 in parallel with the shaft.
1 and the planetary gear 42 that is rotatably pivotally attached to the HST5.
Of the sun gear 44, which is connected to the output side of the gear 10 via the gears 10 and 11 and the annular gear arm 12, and which meshes with the planet gear 42 from the outside, the sun gear 44 which meshes with the planet gear 42 from the inside, A rotary shaft 46, which is arranged behind the gear shaft 45 with the axes aligned, and which is connected to the output shaft 15 via the gear 13 and the gear 14 at the rear end; and a first connecting and disconnecting the gear shaft 45 and the rotary shaft 46. It comprises a clutch 47 and a second clutch 48 which connects and disconnects the rotary shaft 46 and the gear 11.

The HST 5 comprises a variable hydraulic unit 16 and a fixed hydraulic unit 17, and the variable hydraulic unit 16
The inclination of the swash plate 18 is controlled by the control handle 19 as the stroke control means to change the direction and flow rate of the hydraulic oil discharged to the fixed hydraulic unit 17 to change the fixed hydraulic unit 1.
The rotation direction and rotation speed of 7 are changed. That is, the control handle 19 is moved from the neutral position to the forward rotation maximum stroke position 20.
The rotation speed of the fixed hydraulic unit 17 in the forward rotation direction is increased by tilting it to the reverse rotation maximum rotation position 21 and the rotation speed in the reverse rotation direction is increased by tilting it to the reverse rotation maximum stroke position 21. Further, the connection / disconnection of the first clutch 47 and the second clutch 48 is controlled by a limit switch 22 as a clutch control means. That is, until the control handle 19 pushes the limit switch 22 from the neutral position, the first clutch 4
7 is "OFF", the second clutch 48 is "ON",
When the control handle 19 pushes the limit switch 22 at the forward rotation maximum stroke position 20, the first clutch 47 is turned “ON”.
Then, the second clutch 48 is in the "off" state. This state is maintained until the control handle 19 is separated from the limit switch 22 and the limit switch 22 is pushed again. When the control handle 19 is pushed again, the first clutch 47 is "off" and the second clutch 48 is "on". It is supposed to return to.
The annular gear 43, the planetary gear 42, and the sun gear 44 are
And constitute a planetary gear mechanism 49.

In the mechanical hydraulic transmission, the control handle 19 is in the neutral position and the input shaft 1 is the prime mover.
When driven to rotate by (not shown), the first clutch 4
7 is in the "off" state and the second clutch 48 is in the "on" state, but since there is no oil discharged from the variable hydraulic unit 16, the fixed hydraulic unit 17 does not rotate and the output shaft 15 is stopped. Next, when the control handle 19 is tilted toward the maximum forward rotation stroke 28, the fixed hydraulic unit 17 is rotated by the discharged oil in the positive direction at a speed according to the inclination, and the rotation thereof is performed by the gears 10, 11 and the second clutch. 48, rotating shaft 46
And is transmitted to the output shaft 15 via the gears 13 and 14. In this HS mode, the output shaft 10 rotates at a speed corresponding to the rotation speed of the fixed hydraulic unit 17.

Further, when the control handle 19 reaches the maximum forward rotation stroke 28 and depresses the limit switch 22,
The first clutch 47 is in the "on" state and the second clutch is in the "off" state. In this HM mode, the rotation of the input shaft 1 is transmitted from the gear 3 to the HST 5 and hydraulically fixed to the fixed hydraulic unit 1.
The output of 7 is the gears 10 and 11 and the annular gear arm 12.
Is transmitted to the annular gear 43 via the gears 6, 7 and
And mechanically transmitted to the flange 9 via the power transmission shaft 8. As a result, the rotation speed of the sun gear 44 that forms the planetary gear mechanism 49 becomes a speed obtained by combining the rotation speed of the flange 9 and the rotation speed of the annular gear 43. That is, the rotational speeds of the flange (power transmission shaft) 9, the annular gear 43, and the sun gear 44 around the power transmission shaft 8 are N ₁ , N ₂ , and N ₃ , respectively, and the annular gear 43,
If the number of teeth of the sun gear 44 is Z ₂ and Z ₃ , respectively, (N ₃ −
The relational expression N ₁ ) Z ₃ = − (N ₂ −N ₁ ) Z ₂ holds. When the control handle 19 is moved from this state toward the neutral position, the rotational speed of the fixed hydraulic unit 17 is decreased due to the decrease in the amount of oil discharged from the variable hydraulic unit 16, and the rotational speed N ₂ of the annular gear 43 is decreased. Since the rotation speed N ₁ of the flange 9 is constant, the above relational expression N ₃ = (N ₁ −N ₂ ) Z ₂ / Z ₃ +
The rotation speed N ₃ of the sun gear 44 increases from N _{1, and} the rotation speed of the output shaft 15 increases via the first clutch 47 in the “on” state. When the control handle 19 comes to the neutral position, the rotation of the fixed hydraulic unit 17 stops because there is no discharged oil, the rotation speed Z ₂ of the annular gear 43 becomes zero, and the rotation of the input shaft 1 becomes
All are mechanically transmitted from the power transmission shaft 8 to the output shaft 15 via the planetary gear mechanism 49 and the first clutch 47, and maximum power transmission efficiency is obtained.

Next, when the control handle 19 is moved from the neutral position toward the reverse rotation maximum stroke position 21, the variable hydraulic unit 16 increases the amount of oil discharged in the reverse direction, and the fixed hydraulic unit 17 and the annular gear 43 reverse. Rotate in the direction
(N ₂ <0), the rotation speed of the output shaft 15 further increases. When reaching the reverse rotation maximum stroke position 21, the output shaft 15 reaches the maximum rotation speed. Further, when the output shaft 15 is reversed in order to move the vehicle backward, in the HS mode in which the first clutch 47 is "off" and the second clutch 48 is "on", the control handle 19 is reversed from the neutral position. It may be moved toward the maximum stroke position 21.

[0007]

However, in the above-mentioned conventional mechanical-hydraulic transmission, the planetary gear mechanism 49 in which the annular gear 43, the planetary gear 42, and the sun gear 44 mesh with each other is used as a mechanical power source and a hydraulic power source. Since it is used in a differential device, it has a drawback that a large amount of noise is generated during operation due to the meshing of a large number of gears. In addition to the planetary gear mechanism 49, the sun gear shaft 44 and the output shaft 1 can be switched to switch between the HS mode and the HM mode.
The first and second two clutches 47 on the rotary shaft 46 between
Since 48 is provided, there are disadvantages that the structure is complicated, the number of parts is increased, and the manufacturing cost is increased.

Therefore, an object of the present invention is to reduce the noise during operation by using a differential device which is low in noise in place of the planetary gear and which can omit one clutch, and simplifies the structure. It is an object of the present invention to provide a mechanical hydraulic transmission that can reduce the manufacturing cost.

[0009]

In order to achieve the above object, the mechanical hydraulic transmission of the present invention is rotated by an input shaft 1, an output shaft 15, and the input shaft 1 as illustrated in FIG. A planetary roller 25 rotatably mounted on a driven power transmission shaft 8 and a plurality of support shafts 24 obliquely provided on the outer periphery of a flange 9 at the end of the power transmission shaft 8 so as to spread outward in the axial direction. A variable hydraulic unit 16 that is rotationally driven by the input shaft 1, a fixed hydraulic unit 17 that is rotationally driven by the discharge oil of the variable hydraulic unit 16,
The guide ring 27 at the open tip is the planetary roller 2 described above.
5, a bottomed cylindrical tube 26 is coaxially fixed, a control gear 11 driven by the fixed hydraulic unit 17, and a truncated conical sun roller 29 internally fitted to the planet roller 25 at the tip. A rotary shaft 28 which is provided movably in the axial direction through the tube 26 and the center of the control gear 11 and has a rear end gear 13 which meshes with the output shaft 15; A piston 30 which is fitted in a liquid-tight and slidable manner between the tubes 26, and which moves the sun roller 29 of the rotary shaft 28 in the axial direction so as to move toward and away from the planetary roller 25 by the supplied hydraulic oil; Between the gear 13 at the rear end of the rotating shaft 28 and the tube 26,
When the sun roller 29 is brought into contact with or separated from the planetary roller 25, the clutch means 38 is provided so as to be engaged or disengaged from the control gear 11, respectively, and the stroke of the variable hydraulic unit 16. And a clutch control means 22 for disengaging the clutch means 38 when the stroke control means 19 reaches the forward rotation maximum stroke position 20.

[0010]

Operation: Stroke control means 1 of variable hydraulic unit 16
When 9 is not in the forward rotation maximum stroke position 20, the clutch control means 22 supplies hydraulic oil to, for example, one side of the piston 30 fitted in the tube 26 of the control gear 11 to rotate through the center of the tube 26. The shaft 28 is moved in the other axial direction to bring the clutch means 38 provided on the rotary shaft 28 into the engaged state with respect to the control gear 11, and the sun roller 29 at the tip of the rotary shaft 28 is separated from the planetary roller 25. In this HS mode, the rotation of the input shaft 1 drives the variable hydraulic unit 16, and the fixed hydraulic unit 17 is rotated by the oil discharged from the variable hydraulic unit 16 in an amount corresponding to the position of the stroke control means 19. Rotation is control gear 1
1. Clutch means 38 and rotating shaft 2 connected thereto
Stroke control means 1 transmitted to the output shaft 15 via
The output shaft 15 rotates at a speed corresponding to the position of 9.

Next, when the stroke control means 19 reaches the forward rotation maximum stroke position 20, the clutch control means 22 supplies hydraulic oil to, for example, the other side of the piston 30 to move the rotary shaft 28 in one axial direction. Then, the clutch means 38 is moved to the disengaged state with respect to the control gear 11, and the sun roller 29 at the tip of the rotary shaft 28 is fitted and brought into contact with the planetary roller 25. In the HM mode, the rotation of the input shaft 1 is transmitted from the fixed hydraulic unit 17 to the tube 26 of the control gear 11 to rotate the tube 26 of the control gear 11, and is transmitted through the power transmission shaft 8 to the flange 9 at the shaft end.
A planetary roller 25 pivotally attached to a plurality of support shafts 24 projecting from the outer periphery of the flange 9, a guide ring 27 at the tip of the tube 26 rotating from the outside, and a sun roller 29 from the inside. Since the outer perimeter of each touches,
The rotation speed of the sun roller 29 is the combined speed of the rotation speed of the flange 9 and the rotation speed of the tube 26. Then, the rotation of the sun roller 29 is transmitted to the output shaft 15 via the rotation shaft 28 and the gear 13 at the rear end thereof, and the output shaft 15 rotates at a speed corresponding to the combined speed. As described above, instead of the planetary gear mechanism, a plurality of planetary rollers 25 that are obliquely pivotally attached to the outer periphery of the flange 9 at the end of the power transmission shaft 8 and the tube 2 coaxially fixed to the control gear 11 that is externally fitted thereto.
6 and the sun roller 2 that moves in the axial direction of the rotary shaft 28 by the piston 30 so as to move toward and away from the inner circumference of the planetary roller 25.
Since 9 is used, noise during operation can be reduced, one clutch can be omitted, the structure can be simplified, and the number of parts can be reduced.

[0012]

The present invention will be described in detail below with reference to the embodiments shown in the drawings. FIG. 1 is a schematic configuration diagram showing an example of a mechanical hydraulic transmission of the present invention. This transmission is described with reference to FIG. 2, except that the planetary gear mechanism 49 of FIG. 2 is a planetary roller mechanism, the first clutch 47 is omitted, and a hydraulic circuit for axially driving the rotating shaft 46 is provided. The structure is the same as that of the transmission, and the same members are denoted by the same reference numerals and description thereof is omitted. The planetary roller mechanism 23 rotates the planetary rollers 25, 25, ... On a plurality of support shafts 24 obliquely provided on the outer periphery of the flange 9 at the rear end of the power transmission shaft 8 so as to spread outward in the axial direction. On the other hand, the tube 26 having a bottomed cylindrical shape is coaxially fixed to the control gear 11 via the arm 12 while being pivotally attached freely.
A rotary shaft arranged so that a guide ring 27 having a tapered cross section attached to the inner circumference of the tip opening of 6 is brought into contact with the outer circumference of the planetary roller 25, and is movably arranged in the axial direction through the tube 26 and the center of the control gear 11. At the tip of 28, a conical truncated sun roller 29 that can abut the inner circumference of the planetary roller 25.
Is provided and configured.

In the tube 26, a piston 30 is slidably mounted on the rotary shaft 28 and liquid-tight through O-rings 31a and 31b, and passed through the gear 13 and the center of the rotary shaft 28. The oil passage 32 and the tube 2 that come out to the outer periphery of the rotating shaft 28
The hydraulic oil is supplied to one side of the piston 30 through the annular groove 33 and the oil passage 34 on the inner circumference of the rotary shaft insertion hole of 6, and the sun roller 29 is moved forward together with the rotary shaft 28 via the push ring 35. While contacting the planetary roller 25, a thrust bearing 36 is mounted in the recess of the inner surface of the flange 9, and the sun roller 2 is inserted between the thrust bearing 36 and the sun roller 29.
A spring 37 for urging 9 toward the axial rear is contracted. Further, between the gear 13 at the rear end of the rotating shaft 28 and the tube 26, when the sun roller 29 comes into contact with or separates from the planetary roller 25, a clutch shoe provided on the inner circumference of the central hole of the control gear 11. A clutch disc 38b is provided so that the clutch disc 38b is turned on and off respectively.
Make up. The flange 9, the tube 26, and the rotary shaft 28, on which the planetary roller 25 is pivotally mounted, are in the HM mode in which the planetary roller 25 and the sun roller 29 are in contact with each other, and the three rotate as different gears at different rotational speeds. In the HS mode in which the planetary roller 25 and the sun roller 29 are separated from each other, the former and latter two rotate at different rotational speeds from each other, so that the tube 26, the piston 30, and the rotating shaft 28 can rotate relative to each other and slide relative to each other. The contact portion is liquid-tight.

In the oil passage 32 communicating with the piston 30, a hydraulic pressure source 4 is provided via an electromagnetic switching valve 39 located at 3 ports and 2 positions.
0 is connected. When the control handle 19 as the stroke control means of the variable hydraulic unit 16 pushes the limit switch 22 as the clutch control means at the forward rotation maximum stroke position 20, the limit switch 2
Until 2 is pressed again by the control handle 19, the solenoid is energized to switch the electromagnetic switching valve 39 to the symbol position on the left side in the figure, and the hydraulic oil is supplied from the hydraulic power source 40 to one side of the piston 30. There is.

The mechanical-hydraulic transmission having the above structure operates as follows. Control handle 19 of variable hydraulic unit 16
However, when the limit switch 22 is not pushed down in the forward rotation maximum stroke position 20 and the limit switch 22 is not pushed down, the limit switch 22 does not energize the solenoid directional control valve 39, and the oil directional control valve 39 at the symbol position on the right side of the drawing causes the oil passage. The oil chamber on one side of the piston 30 is opened to the tank through 32 and the like. Then, by the spring 37 compressed in the inner surface concave portion of the flange 9,
The rotating shaft 28 including the sun roller is slid rearward together with the piston 30, the sun roller 29 is separated from the planetary roller 25, and the clutch disc 38b abuts on the clutch shoe 38a to put the clutch 38 into the engaged state. The gear 11 and the rotating shaft 28 are connected. This HS
In the mode, the rotation of the input shaft 1 drives the variable hydraulic unit 16 via the gears 2 and 3 and the variable unit shaft 4 as shown by the broken line HS in the figure, and the inclination of the control handle 19 from the variable hydraulic unit 16 is driven. The fixed hydraulic unit 17 is rotated by the hydraulic oil discharged in an amount corresponding to, and this rotation is output via the gear 10, the control gear 11, the rotary shaft 28 and the gears 13 and 14 connected to the control gear 11 by the clutch 38. Transmitted to the shaft 15, the output shaft 15 rotates at a speed according to the inclination of the control handle 19.

Next, when the control handle 19 reaches the forward rotation maximum stroke position 20 and depresses the limit switch 22, the limit switch 22 energizes the electromagnetic switching valve 39 to switch it to the symbol position on the left side in the drawing. The hydraulic oil is supplied into the tube 26 from the hydraulic power source 40 via the electromagnetic switching valve 39, the oil passage 32, the annular groove 33, and the oil passage 34, and the piston 30 slides forward. This sliding moves the rotary shaft 28 forward through the push ring 35, disengages the clutch 38 from the control gear 11, and causes the sun roller 29 at the tip of the rotary shaft 28 to move to the planetary roller 2.
5, the guide ring 27 on the inner circumference of the tip of the tube 26 integrated with the control gear 11, and the planetary roller 25 pivotally attached to the flange 9 integral with the power transmission shaft 8; The sun rollers 29 at the tip of 28 are in close contact with each other to form a differential mechanism. In this HM mode, the rotation of the input shaft 1 is caused by the broken line HS and the alternate long and short dash line HM in the above figures.
As shown by, the fixed hydraulic unit 17 to the control gear 11
Is transmitted to the power transmission shaft 8 from the gears 6 and 7 to rotate the flange 9 at the shaft end, as shown by the solid line HM in the figure. Here, since the guide rings 27 of the tube 26 rotating from the outside come into contact with the planetary rollers 25 pivotally attached to the support shafts 24 protrudingly provided on the outer periphery of the flange 9, and the sun rollers 29 come from the inside, respectively, The rotation speed of the sun roller 29 is a combined speed of the rotation speed of the flange 9 and the rotation speed of the tube 26 as described in the planetary gear mechanism of FIG. And
The rotation of the sun roller 29 is transmitted to the output shaft 15 via the rotation shaft 28 and the gears 13 and 14 at the rear end thereof, and the output shaft 1
5 rotates at a speed according to the combined speed.

In the HM mode, if the control handle 19 located at the maximum forward stroke position 20 is moved toward the neutral position, the tube 26 is hydraulically transmitted through the HST 5 as in the conventional example shown in FIG. The rotational speeds of the sun roller 29 and the rotary shaft 28 increase, and the power of the input shaft 1 is mechanically transmitted to the output shaft 15 through the power transmission shaft 8 in the neutral position. Maximum power transmission efficiency is obtained. Furthermore, the control handle 19
If is moved from the neutral position to the reverse rotation maximum stroke position 21, the rotation speed of the output shaft 15 further increases and reaches the maximum value at the reverse rotation maximum stroke position 21, as described in the conventional example. In order to rotate the output shaft 15 in the reverse direction, in the HS mode before the control handle 19 presses the limit switch 22 (the electromagnetic switching valve 39 is in the right symbol position in the drawing), the control handle 19 is rotated in the reverse rotation maximum stroke position 21. Just move it towards. In the HM mode described above, the control handle 19 once leaves the limit switch 22,
It is maintained until the limit switch 22 is pressed again, and when the limit switch 22 is pressed again, the limit switch 22 stops energizing the electromagnetic switching valve 39. Thus, the electromagnetic switching valve 39 is switched to the symbol position on the right side in the drawing, and the spring 37 causes the sun roller 29 and the planetary roller 25 to move.
Will be disengaged and the original HS mode will be restored.

As described above, in the present invention, in place of the conventional planetary gear mechanism, the planetary rollers 25 that are pivotally attached to the outer periphery of the flange 9 of the power transmission shaft 8 obliquely and the control gear 11 externally fitted to the planetary rollers 25 are provided. Tube 26 fixed coaxially and tube 2
Since the sun roller 29, which is moved so as to be fitted into and removed from the inner circumference of the planetary roller 25 by the piston 30 in 6, is used, noise during operation is significantly reduced, and one clutch can be omitted. The number of parts can be reduced by simplifying the process, and the manufacturing cost can be reduced because gear cutting is not required. In the above embodiment, the sun roller 2
Although the rotary shaft 28 is biased by the spring 37 in order to disengage the 9 and the planetary roller 25 from each other, the rotary shaft 28 can be retracted by a structure in which hydraulic oil is supplied to and discharged from both sides of the piston 30.

As is apparent from the above description, the mechanical-hydraulic transmission of the present invention has the shaft end flange of the power transmission shaft that is rotationally driven by the input shaft, and is slanted so as to spread outward in the axial direction. A planetary roller is rotatably pivoted on a plurality of projecting support shafts, while a variable hydraulic unit is driven by the input shaft to drive a fixed hydraulic unit by the discharged oil, which is rotationally driven by the fixed hydraulic unit. A bottomed cylindrical tube is fixed coaxially with the control gear, the guide ring at the open end of this tube is externally fitted to the planetary roller, and at the tip of the rotating shaft arranged through the center of the tube and the control gear. The provided truncated cone-shaped sun roller can be fitted into the planetary roller, the rear end of the rotating shaft is meshed with the output shaft by a gear, and the rotating shaft is fitted with a piston in the tube so that the operating oil is applied to the sun. Over La moves to contact and separation to the planetary rollers, the contact, switching respect combined control gear away,
Clutch means is provided on the rotary shaft so as to be in the on state,
Further, when the stroke control means of the variable hydraulic unit has reached the maximum forward rotation stroke position, the clutch control means causes the clutch means to be in the disengaged state, so that the rollers can reduce noise during operation, and the clutch can be operated. The manufacturing cost can be reduced by simplifying the structure such as omitting one.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a mechanical hydraulic transmission of the present invention.

FIG. 2 is a schematic configuration diagram showing a conventional mechanical hydraulic transmission.

[Explanation of symbols]

1 ... Input shaft, 2, 3, 6, 7, 10, 13, 14 ... Gear, 15
... output shaft, 4 ... variable unit shaft, 5 ... HST, 8 ... power transmission shaft, 9 ... flange, 11 ... control gear, 12 ... arm, 16 ... variable hydraulic unit, 17 ... fixed hydraulic unit, 18 ... swash plate, 19 ... Control handle, 20 ... Forward rotation maximum stroke position, 21 ... Reverse rotation maximum stroke position, 22
... Limit switch, 23 ... Planetary roller mechanism, 24 ... Spindle, 25 ... Planetary roller, 26 ... Tube, 27 ... Guide ring, 28 ... Rotating shaft, 29 ... Sun roller, 30 ... Piston, 31a, 31b ... O-ring, 32, 34 ... Oil passage, 33
... annular groove, 35 ... push ring, 37 ... spring, 38 ... clutch, 39 ... electromagnetic switching valve, 40 ... hydraulic source.

Claims (1)

[Claims] 1. An input shaft (1), an output shaft (15), a power transmission shaft (8) rotationally driven by the input shaft (1), and a flange (9) at the end of the power transmission shaft (8). ) A plurality of support shafts (24) that are obliquely provided so as to spread outward in the axial direction
A planetary roller (25) rotatably attached to the
Variable hydraulic unit (16) driven to rotate by (1)
A fixed hydraulic unit (17) rotatably driven by the discharge oil of the variable hydraulic unit (16), and a bottomed cylindrical shape in which a guide ring (27) at the open end is fitted onto the planetary roller (25). Control gear driven by the fixed hydraulic unit (17) by coaxially fixing the tube (26) of
(11) and a cone-shaped sun roller (29) that fits inside the planetary roller (25) at the tip, and moves axially through the center of the tube (26) and control gear (11). The gear (13) that is provided so that it can be provided at the rear end is the output shaft (15).
The rotary shaft (28) meshing with the rotary shaft (28) is fitted in a liquid-tight and slidable manner between the rotary shaft (28) and the tube (26). Laura (2
Between the piston (30) for axially moving 9) to and from the planetary roller (25) and the rear end gear (13) and the tube (26) of the rotary shaft (28), Laura (2
When 9) is in contact with or separated from the planetary roller (25),
A clutch means (38) provided so that the control gear (11) is turned on and off respectively, and a stroke control means for controlling a stroke of the variable hydraulic unit (16).
(19) and the clutch means when the stroke control means (19) reaches the forward rotation maximum stroke position (20).
A mechanical-hydraulic transmission comprising: a clutch control means (22) for disengaging (38).