JPH05106609A - Hydraulic control device - Google Patents

Abstract

PURPOSE:To reduce the number of parts used, decrease the rate of failure, and prevent the oil leakage in the hydraulic control device having a hydraulic control valve, by constructing the control valve by a body and a spool, and moving the spool in the direction of closing the input port in corresponding relation to the amount moved of an operated member. CONSTITUTION:When a spool 73 is rotated using a stepping motor 74, the rotation of the spool 73 is converted to an axial movement thereof by a transmission member 77 whose axial movement is regulated by a feedback means 78. By this an operating oil is supplied to a hydraulic cylinder with a main port 72a, a first port 72b, and a groove 73a of the spool 73 being communicated with each other, through the movement of the spool 73, to thereby operate an operated member. The moved amount of this operated member is transmitted to arms 81a, 81b of the feedback means 78. The arm 81a is caused to abut against procession cam 79 by the urging force of a compression coil spring 82, and the arm 81b is swung in the leftward direction to move the spool 73 in the direction of closing the main port 72a, thus rendering the operating oil supply ineffective.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic control device, and more particularly to a hydraulic control device equipped with a hydraulic control valve for controlling the supply and discharge of hydraulic oil to and from a hydraulic cylinder as a hydraulic actuator.

[0002]

2. Description of the Related Art As a transmission mounted on an automobile, a toroidal type continuously variable transmission capable of continuously changing the speed of an engine and transmitting the same to an output shaft is known. Generally, an input disc that receives an engine output and rotates, an output disc that is coaxially opposed to the input disc, and an output disc that is disposed between the output disc and the input disc and is in contact with both of these discs. Having a plurality of rollers that are rotatable and tiltable, and a roller support member that supports these rollers so that they can rotate and tilt, and tilt the rollers by moving the roller support member in the axial direction. Thus, the rotation of the input disc is steplessly changed according to the tilt angle and transmitted to the output disc.

In the toroidal type continuously variable transmission, the roller supporting member is tilted so as to tilt the roller supported by the roller supporting member, as disclosed in Japanese Patent Laid-Open No. 61-119865. As an actuator for moving in the axial direction, a hydraulic cylinder is provided for each roller support member, and a hydraulic control valve for controlling supply and discharge of hydraulic oil to and from the hydraulic cylinder is provided. This hydraulic control valve
As shown in FIG. 6, an input passage 100a to which hydraulic oil is supplied from a hydraulic pressure source (not shown) and first and second output passages 100b and 100c for supplying hydraulic oil to each hydraulic cylinder are formed. Valve body 100 and the valve body 10
0 is slidably inserted and has the input passage 100a.
To the input port 101a and each output passage 1 described above.
First and second output ports 1 communicating with 00b and 100c
Sleeve 101 in which 01b and 101c are respectively formed
And a spool 102 slidably inserted into the sleeve 101, and a spring 104 is interposed between a shaft 103 fixed to the sleeve 101 and the spool 102. An actuator 10 for moving the sleeve 101 in the axial direction is provided at the end of 101.
5 are provided. Further, a swingable bell crank 106 for feeding back the operation amount of a roller support member driven by a hydraulic cylinder to move the spool 102 in the axial direction is brought into contact with the end portion of the spool 102. There is. According to this, the actuator 10
By moving the sleeve 101 in the axial direction by 5, the input passage 100a provided in the valve body 100 via the land portion formed in the spool 102, for example.
And the first output passage 100b or the second output passage 100c
Are connected to each other, hydraulic oil is supplied to the hydraulic cylinder, and the roller support member is operated by the hydraulic cylinder. Then, the bell crank 106 swings in a predetermined direction in accordance with the operation amount of the roller support member by the hydraulic cylinder, this operation is transmitted to the spool 102 via the bell crank 106, and the spool 102 is moved in the axial direction. And again the input passage 100a and the first output passage 100
b or the second output passage 10c is cut off, so that the roller supporting member is maintained in the operating state.

[0004]

By the way, in the above hydraulic control valve, when supplying hydraulic oil to the hydraulic cylinder, the sleeve 101 is moved in the axial direction relative to the spool 102 to form the input passage 100a. When the first output passage 100b or the second output passage 100c is communicated with each other and the input passage 100a is disconnected from the first output passage 100b or the second output passage,
It is necessary to move the spool 102 in the axial direction relative to the sleeve 101. Therefore, the hydraulic control valve includes the valve body 100, the sleeve 101 slidably provided in the valve body 100, and Spool 10 slidably provided in the sleeve 101
Therefore, it is inevitable that the structure is composed of 3 layers of 2 and 2. Therefore, it has been a hindrance to reduce the number of parts and reduce the failure rate to improve the accuracy if the weight is reduced.

Further, since the hydraulic control valve is composed of a plurality of members as described above, there is a concern that an oil leak may occur between the members, and the controllability may deteriorate.

Therefore, the present invention provides a hydraulic control equipped with a hydraulic control valve for controlling the supply and discharge of hydraulic oil to and from a hydraulic cylinder as a hydraulic actuator equipped with various devices such as the toroidal type continuously variable transmission. In the device, by simplifying the structure of the control valve, the number of parts is reduced,
Therefore, it is an object of the present invention to provide a hydraulic control device capable of achieving cost reduction, weight reduction, and reduction of failure rate, and at the same time, preventing occurrence of oil leak and improving controllability.

[0007]

In order to solve the above problems, the present invention is characterized in that it is configured as follows.

First, the invention according to claim 1 of the present application (hereinafter,
A first invention) is a hydraulic control device including a hydraulic control valve for controlling supply and discharge of hydraulic oil to and from a hydraulic cylinder, wherein the hydraulic control valve is connected to an input port connected to a hydraulic source and the hydraulic cylinder. A valve body provided with an output port; and an input port that is provided in the valve body so as to be movable in the axial direction and cuts off the input port and the output port from each other according to the amount of movement in the axial direction. A drive unit configured to move the spool in the axial direction to communicate with the input port and the output port, and a spool configured to change the communication state with the output port; Feedback means for moving the spool in the direction to block the input port, and when the spool is moved by the driving means. Permitting relative movement between said spool and said feedback means, and characterized in that a one-way transmission means for moving the spool with said feedback means during movement of the spool by the feedback means.

The invention according to claim 2 of the present application (hereinafter,
According to a second invention), a pair of input / output disks arranged to face each other on a rotation shaft, and arranged between the input / output disks to rotate in contact with both disks, and can be tilted according to a tilt angle. A roller for steplessly changing the rotation of the input disk and transmitting the rotation to the output disk; and a roller support member for rotatably supporting the roller and capable of moving by itself to tilt the roller according to the amount of movement. A hydraulic control device in a toroidal type continuously variable transmission including a hydraulic cylinder for moving the roller support member, wherein an input port connected to a hydraulic source is a hydraulic control valve for controlling supply and discharge of hydraulic oil to and from the hydraulic cylinder. And a valve body provided with an output port connected to the hydraulic cylinder, and provided in the valve body so as to be movable in the axial direction and with the input port. A spool for changing the communication state between the input port and the output port according to the amount of movement in the axial direction from the state in which the input port and the output port are cut off, and rotation drive means for rotating the spool, Feedback means for moving the spool in the direction of blocking the input port according to the amount of movement of the roller support member by the hydraulic cylinder, and conversion of rotation of the spool by the rotation driving means into movement in the axial direction. One-way transmission means for allowing relative movement between the spool and the feedback means and for moving the spool together with the feedback means when the spool is moved by the feedback means is provided.

The invention according to claim 3 of the present application (hereinafter,
In the second invention, the feedback means is provided between one end of the spool and the roller support member, and the feedback means is provided at the other end of the spool via the spool on the roller support member side. It is characterized in that an urging means for urging is provided.

[0011]

According to the first aspect of the invention, when the spool is moved in the axial direction by the driving means, the one-way transmission means allows the relative movement of the spool and the feedback means.
Only the spool is moved in the axial direction, whereby the input port and the output port provided in the valve body are brought into a predetermined communication state according to the movement amount of the spool, and the hydraulic oil is supplied to the hydraulic cylinder. Is supplied, and the operated member is operated by the hydraulic cylinder. When a feedback amount corresponding to the actuation amount of the actuated member is transmitted to the spool through the feedback means, the one-way transmission means moves the spool together with the feedback means so that the input port is re-established by the spool. By being cut off, the actuated member is maintained in the actuated state. As described above, according to the first aspect of the invention, the one-way transmission means allows relative movement between the spool and the feedback means so that the input port and the output port communicate with each other when the spool is moved by the drive means. When the spool is moved by the feedback means, the spool is moved together with the feedback means so as to cut off the input port and the output port. Therefore, it is only necessary to move the spool in the axial direction with respect to the valve body. , It becomes possible to control the supply and discharge of hydraulic oil to and from the hydraulic cylinder, and the hydraulic control valve consists of a valve body and a spool.
It is possible to have a layered structure. As a result, the number of parts is reduced as compared with the conventional hydraulic control valve of this type having a three-layer structure including a valve body, a sleeve, and a spool, which simplifies the structure. Thus, the size and weight can be reduced, the layout can be improved, the number of parts can be reduced, and the structure can be simplified. Therefore, the failure rate can be reduced. Furthermore, since the hydraulic control valve has a two-layer structure, 3
Compared with the case of the layered structure, the number of parts where oil leakage is concerned is reduced, and the controllability is improved.

According to the second invention, as in the first invention, when the spool is rotationally driven by the rotational driving means by the one-way transmission means, the input port and the output port are communicated with each other. The spool is moved in the axial direction relative to the feedback means, and when the spool is moved by the feedback means, the spool is moved together with the feedback means so as to block the input port and the output port. Since it is possible to control the supply and discharge of hydraulic oil to and from the hydraulic cylinder simply by moving the spool in the axial direction with respect to the valve body, the hydraulic control valve has a two-layer structure including the valve body and the spool. It becomes possible.
As a result, the number of parts is reduced as compared with the conventional hydraulic control valve of this type having a three-layer structure including a valve body, a sleeve, and a spool, which simplifies the structure. Thus, the size and weight can be reduced, the layout can be improved, the number of parts can be reduced, and the structure can be simplified. Therefore, the failure rate can be reduced. Further, since the hydraulic control valve has a two-layer structure, the number of parts where oil leakage may occur is reduced as compared with the case where the hydraulic control valve has a three-layer structure, and the controllability is improved.

According to the third aspect of the invention, in the hydraulic control valve of the second aspect of the invention, the feedback means provided between the one end of the spool and the roller support member by the biasing means supports the roller via the spool. Therefore, as in the case where the biasing means is provided on the feedback means side, the biasing means always causes a predetermined bias without causing rattling between the feedback means and the spool. Since the feedback means is pressed against the roller support member side via the spool by the force, the responsiveness of the spool during the operation of the feedback means is enhanced and the controllability is improved.

[0014]

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

FIG. 1 is an overall schematic diagram showing a power transmission system of a vehicle including a toroidal type continuously variable transmission equipped with a hydraulic control device according to the present invention.
Of the torque converter 3, which is connected to the output shaft 2a of the engine 2 for increasing the torque, the planetary gear mechanism 10 as a speed reducer to which the output of the torque converter 3 is transmitted, and the rotation of the engine 2 are input to rotate the rotation. And a toroidal type continuously variable transmission 30 capable of continuously changing gears, the output of the planetary gear mechanism 10 or the toroidal type continuously variable transmission 30,
Alternatively, both outputs are transmitted to the output shaft 4, whereby the left and right rear wheels (not shown) are rotationally driven.

The torque converter 3 has a casing 3a connected to the output shaft 2a of the engine 2 and a pump 3b integral with the casing 3a, and the pump 3b is disposed so as to face the pump 3b.
The turbine 3c driven by hydraulic oil by means of a hydraulic fluid, and the stator 3d interposed between the turbine 3c and the pump 3b to increase the torque.
a turbine shaft 3e that rotates integrally with c, and a first hollow shaft 3g that is externally fitted to the turbine shaft 3e and has one end connected to the stator 3d via a one-way clutch 3f to be integrated with the transmission casing 5. Are connected to the planetary gear mechanism 10. Furthermore, the first
It is fitted onto the hollow shaft 3g and one end of which is the casing 3
An oil pump 6 is provided at the shaft end of the second hollow shaft 3h connected to a, and the oil pump 6 is driven by the engine 2 via the casing 3a.

The planetary gear mechanism 10 has a first planetary gear mechanism 11 and a second planetary gear mechanism 12 which are coaxially arranged in series with the turbine shaft 3e, and the first planetary gear mechanism 12 is arranged on the engine 2 side. The planetary gear mechanism 11 is for backward movement, the second planetary gear mechanism 12 is for forward movement, and the first planetary gear mechanism 11 is a single pinion type and is coupled to the turbine shaft 3e. A pinion 1 having a sun gear 13 and meshing with the sun gear 13.
A carrier 15 that rotatably supports 4 is coupled to the first hollow shaft 3g (fixed to the transmission casing 5),
Further, a ring gear 16 meshing with the pinion 14 is connected via a reverse clutch 17 to the output shaft 4 arranged on the same axis as the turbine shaft 3e.

On the other hand, the second planetary gear mechanism 12 is of a double pinion type, the inner pinion 18 is integrated with the pinion 14 of the first planetary gear mechanism, and
The sun gear 13 of the first planetary gear mechanism 11 is also used as the sun gear of the second planetary gear mechanism 12. Further, the carrier 20 that fixedly supports the inner pinion 18 and the outer pinion 19 is integrated with the carrier 15 of the first planetary gear mechanism 11 and is fixed to the transmission casing 5 via the first hollow shaft 3g. There is. Further, the ring gear 21 constituting the second planetary gear mechanism 12 is connected to the output shaft 4 via a forward clutch 22 and a one-way clutch 23, and the reverse clutch 1
The forward clutch 22 and the forward clutch 22 constitute a forward / reverse switching device, and when the reverse clutch 17 is engaged, the output of the turbine shaft 3e is transmitted to the output shaft 4 via the first planetary gear mechanism 11. Accordingly, the left and right rear wheels are rotationally driven in the backward direction, and when the forward clutch 22 is engaged, the output of the turbine shaft 3e is output via the second planetary gear mechanism 12 as described above. It is transmitted to the output shaft 4, whereby the left and right rear wheels are rotationally driven in the forward direction.

Next, the structure of the toroidal type continuously variable transmission 30 will be described in more detail. The toroidal type continuously variable transmission 30 is arranged on the output shaft 4 as shown in FIGS. The first transmission unit 31 and the second transmission unit 32 are provided, and the respective transmission units 31, 32 have the same structure, and are provided on the output shaft 4 so as to be rotatable with respect to the shaft. Input disk 3
3, 33, and output discs 34, 3 that are arranged to face the input discs 33, 33 and rotate integrally with the output shaft 4.
4 and a pair of rollers 35, 35 which are respectively arranged between the input / output disks 33, 34 so as to rotate in contact with both disks and to be tiltable.

Then, as shown in FIG. 2, each output disc 3 in the first and second transmission units 31 and 32.
The bearings 4 and 34 are spline-fitted to the output shaft 4, respectively, and the output disc 34 of the first transmission unit 31 is positioned by the ring-shaped positioning member 36 fitted to the output shaft 4. It is rotatably supported by the transmission casing 5 via 37a. Further, the output disc 34 of the second transmission unit 32 has the enlarged diameter portion 4 formed integrally with the output shaft 4.
a and the transmission casing 5 are provided between the output shaft 4 and
Is positioned by a bearing 37b that rotatably supports the input discs 33, 33 in the first and second transmission units between the output discs 34, 34. , 33, an intermediate disk 38 which is rotatable relative to each of the input disks 33, 33 is arranged.
A plurality of loading cams 39 ... 39 are respectively interposed between the intermediate disc 38 and the respective input discs 33, 33.
And when the input disks 33, 33 rotate relative to each other,
Each input disk 33, 33 is replaced with each output disk 34, 34
It has a function of generating a pressing force that pushes it to the side, and as the input torque input from the engine 2 to each input disk 33a, 33b increases, the pressing force of each cam 39 against each input disk 33, 33 increases. It is like this.

The input disks 3 arranged adjacent to each other
A connecting member 40, which is loosely fitted to the output shaft 4 and is spline-fitted to the input disks 33, 33 with both ends abutting the back surfaces of the input disks 33, 33. And the connecting member 40
And the input disc 33 in the second transmission unit 32
A disc spring 41 as a preloading means is interposed between the disc and the disc. The disc spring 41 abuts against the back surface of one of the input discs 33 to press the input disc 33 toward the output disc 34 side. The biasing reaction force of the disc spring 41 acts on the coupling member 40, and the coupling member 40 presses the other input disk 33 toward the output disk 34,
A predetermined preload is applied to the pair of input / output disks 33, 34 in each transmission unit 31, 32.

On the other hand, as shown in FIGS. 1 and 2, an input shaft 42 for inputting the output of the engine 2 to each input disk 33 through the intermediate disk 38 is arranged in parallel with the output shaft 4. A first gear 43 is integrally attached to an end portion of the input shaft 42 located on the torque converter 3 side, the first gear 43 is meshed with an idle gear 44, and further, the idle gear 44 is It is meshed with an output gear 46 connected to the second hollow shaft 3h via a power transmission path switching clutch 45, and is integrally provided with the intermediate disk 38 at the other end of the input shaft 42. A second gear 48 that meshes with the input gear 47 is integrally provided. As a result, when the power transmission path switching clutch 45 is engaged, the engine 2
Output of the toroidal type continuously variable transmission 3 via the input shaft 42.
0 is input to the respective input disks 33, 33 constituting the first and second transmission units 31, 32, and as shown in FIG. 1, a predetermined gear ratio (reduction ratio) corresponding to the tilt angles of the rollers 35, 35 is obtained. The rotation of each input disk 33, 33 is changed in speed and transmitted to each output disk 34, 34.

In this embodiment, as shown in FIG. 2, the output disc 34 in the first transmission unit 31.
In addition, one end of a one-way clutch 23 forming a part of the planetary gear mechanism 10 is spline-fitted. Therefore, the forward clutch 22 in the planetary gear mechanism 10 is engaged, and the reverse clutch 17 is released. When the power transmission path switching clutch 45 is engaged, the output of the engine 2 is output to the output shaft 4 via the planetary gear mechanism 10 and the toroidal continuously variable transmission 30. In this case, the one-way clutch 23
When the rotation of the engine 2 is larger than that on the rear wheel side, the lock state is established. Therefore, when a large torque is required such as at the time of starting, the output of the engine 2 is increased by the torque converter 3 and the output shaft is output. 4 will be output.

Further, during steady running, the one-way clutch 23 is set in a free state, and the output of the engine 2 is shifted by the toroidal type continuously variable transmission 30 according to the running state and output to the output shaft 4. become.

Further, at the time of reverse, the reverse clutch 17 is engaged, the forward clutch 22 is released, and the power transmission path switching clutch 45 is released, so that the output of the engine 2 is output.
Is decelerated by and is output to the output shaft 4.

Here, the toroidal type continuously variable transmission 30
The hydraulic mechanism for tilting the pair of rollers 35, 35 in the first and second transmission units 31, 32 constituting the above will be described. The first speed change unit 3
The 1st side and the 2nd speed change unit 32 side have the same structure. Therefore, the hydraulic mechanism on the 1st speed change unit 31 side will be described, and the description on the 2nd speed change unit side will be omitted. That is, as shown in FIGS. 2 and 3, the first transmission unit 31 includes a pair of first and second trunnions 49a, which serve as roller support members for each roller 35 that rotatably support each roller 35. 49b is provided,
The eccentric shafts 50a, 5 are attached to these trunnions 49a, 49b.
0b, each roller 35 is rotatably supported, and each trunnion 49a, 49b has a shaft member 51 extending in a direction orthogonal to the rear wheel drive shaft 4.
a and 51b are integrally attached to each other.

Further, the transmission casing 5 and the partition wall portion 5a integral with the casing 5 are provided with a pair of support members 5.
2 and 53 are attached to the supporting members 52 and 53, and the first and second trunnions 49a and 4a are attached to the supporting members 52 and 53.
The upper and lower ends of 9b are rotatably supported by spherical bearings 54, ...
The lower ends of the a and 51b penetrate the opening 55a of the upper housing 55 fixed to the lower surface of the partition wall 5a, and the lower housing 56 fixed to the lower surface of the upper housing 55.
It is rotatably supported by the bearing 57 in the recess 56a.

The partition wall portion 5a is provided with hydraulic cylinders 58, 58 for the trunnions 49a, 49b, respectively, and each hydraulic cylinder 58 is paired with a partition wall portion 5b integral with the partition wall portion 5a. Hydraulic chambers 58a, 5
The partition wall 5b is divided into 8b.
In the inner peripheral portion of the shaft member 51a, 51b, which is integral with the first and second trunnions 49a, 49b, an extension portion 5c extending in the axial direction of the shaft member 51a, 51b with a predetermined gap.
Are formed. Further, the hydraulic chambers 58a and 58b are also provided.
Inside, pistons 59a and 59b are respectively installed, and one trunnion 49 is provided by one piston 59a.
a flange 6 integrally formed on the shaft end portions of a and 49b
0 and 60 are pressed, and the flange members 61 and 61 integrally attached to the shaft end portions of the shaft members 51a and 51b are pressed by the other piston 59b. Therefore, when the hydraulic pressure is introduced into either one of the hydraulic chambers 58a and 58b, the trunnions 49a and 49a are driven by the piston 59a or the piston 59b.
b or each shaft member 51a, 51b is moved in the axial direction, that is, the vertical direction in FIG. 3, whereby each trunnion 4 is moved.
The contact points of the rollers 35 rotatably supported by the rollers 9a and 49b with respect to the input / output disks 33 and 34 are changed, and the rollers 35 are tilted.
9a and 49b are adapted to rotate about their axes.

Next, the structure of the hydraulic control device for controlling the supply and discharge of hydraulic oil to and from the hydraulic chambers 58a and 58b of the hydraulic cylinders 58, which is a characteristic part of the present embodiment, will be described. As shown in FIGS. , The upper housing 55
Is provided with a main passage 62a to which hydraulic oil of a predetermined pressure is supplied from a hydraulic source (not shown) and hydraulic cylinders 5 provided for the first and second transmission units 31 and 32, respectively.
The first passage 62b and the second passage 62b for supplying and discharging the hydraulic oil from the main passage 62a to and from the hydraulic chambers 58a, 58b of 8 ... 58.
Passageways 62c are formed respectively. A hydraulic control device 70 is provided in the lower housing 56, and a part of the lower housing 56 constitutes the hydraulic control device 70. A valve body 7 of a hydraulic control valve 71.
The spool 73 is inserted into the valve body 72 so as to be movable in the axial direction.

The valve body 72 has a main port 72a communicating with the main passage 62a and first and second main ports 72a.
First and second ports 72 communicating with the passages 62b and 62c
b, 72c are formed respectively, and the spool 73 has an annular groove 73a communicating with the main port 72a and the first and second ports 72b, 72c provided on the left and right sides of the groove 73a. Land portions 73b and 73c for blocking each are formed.

Further, a stepping motor 74 as a rotation driving means is attached to an end of the valve body 72 projecting from the side wall surface of the oil pan 5d, and a driving member is attached to a rotary shaft 74a of the stepping motor 74. 75 is fixed. On the other hand, a pin 76 is fixedly provided at one end of the spool, and the pin 76 is engaged in a slit 75a formed in the driving member 75, and the pin 76 together with the driving member 75 is rotated by the rotation of the stepping motor 74. 76 is rotationally driven, whereby the spool 73 is rotated.

A transmission member 77 for converting the rotation of the spool 73 into an axial movement is provided at the other end of the spool 73, and the transmission member 77 has the outer peripheral surface thereof with the spool. A male screw portion 77a that is screwed into a female screw portion 73d formed on the inner circumference of the other end of 73 is formed, so that the rotation of the spool 73 is converted into an axial movement by the male screw portion 77a. It has become.

Further, feedback means 78 is provided between the end of the spool 73 and the lower end of the shaft member 51b which is integral with the trunnion 49b constituting the first speed change unit 31.
The feedback means 78 is provided at the lower end of the shaft member 51b and is formed with an inclined surface 79a which rotates integrally with the shaft member 51b.
9 and a first arm fixed to one end of a rotary shaft 80 rotatably provided at a predetermined position of the upper housing 55 so as to be swingable around the shaft 80, and a tip of which abuts on the precess cam 79. 81a and the rotary shaft 8 similarly
The slit 77b fixed to the other end of the shaft 0 and swingable about the shaft 80 and formed in the transmission member 77.
And a second arm 81b whose tip is engaged with.

Further, a compression coil spring 82 as an urging means for urging the first arm 81a of the feedback means 78 toward the precess cam 79 side is mounted between one end of the spool 73 and the stepping motor 74. ..

According to the above construction, when the spool 73 is rotated by the stepping motor 74 from the state shown in FIG. 4, it abuts against the feedback means 78 and the feedback means 78 regulates the movement in the axial direction. The transmission member 77 converts the rotation of the spool 73 into an axial movement, and the spool 73 is axially moved. As shown in FIG. 5, the main port 72a provided on the valve body 72 and the first port 72a are provided. The 1 port 72b is brought into communication with the groove 73a of the spool 73, hydraulic oil is supplied to one hydraulic chamber of each hydraulic cylinder 58, each trunnion 49a, 49b is operated, and each roller 35 is tilted. As a result, the rotation of the input disk 33 is changed in speed and transmitted to the output disk 34. Then, as the trunnions 49a and 49b rotate with the tilting of the rollers 35, the recess cam 79 fixed to the shaft member 51b integral with the trunnion 49b rotates in a predetermined direction, and this rotation is fed back. First and second arms 81a, 81 in the means 78
b, the second arm 81b is swung in the direction of arrow a shown in FIG. 5, whereby the transmission member 77 moves the spool 73 in a direction to block the main port 72a, and the spool 73 Again main port 7
2a will be cut off and each trunnion 49a,
49b will remain active. Furthermore, FIG.
As indicated by the chain line, when the spool 73 is largely moved in the axial direction, the trunnions 49a and 49b are moved in the axial direction according to the amount of movement, and the gear ratio is changed according to the amount of movement. At the same time, the rotation of the trunnion 49b caused by the tilting of each roller 35 is controlled by the spool 73 via the feedback means 78 and the transmission member 77 as described above.
And the spool 73 is moved in the axial direction to shut off the main port 72a.

When the spool 73 is moved in the axial direction opposite to the above, the main port 72a provided in the valve body 72 and the second port 72c are brought into communication with each other and each hydraulic cylinder 58 is connected. The hydraulic oil is supplied to one of the hydraulic chambers 58 ...
9b is actuated to tilt each roller 35, whereby the rotation of the input disk 33 is changed in speed and transmitted to the output disk 34.

As described above, by the transmission member 77,
When the spool 73 is moved by the stepping motor 74, the main port 72a and the first port 72b or the second port 72b
Relative movement between the spool 73 and the feedback means 78 is allowed so as to communicate with the port 72c, and
When the spool 73 is moved by the feedback unit 78, the spool 73 is moved together with the feedback unit 78 so as to block the main port 72a from the first port 72b or the second port 72c. It is possible to control the supply and discharge of hydraulic oil to and from the hydraulic cylinder 58 simply by moving the valve body 72 in the axial direction.
A two-layer structure consisting of As a result, the number of parts is reduced as compared with the conventional hydraulic control valve of this type having a three-layer structure including a valve body, a sleeve, and a spool, which simplifies the structure. Thus, the size and weight can be reduced, the layout can be improved, the number of parts can be reduced, and the structure can be simplified. Therefore, the failure rate can be reduced. Furthermore, since the hydraulic control valve 71 has a two-layer structure, the number of parts where oil leakage is a concern is reduced as compared with a three-layer structure, and controllability is improved. ..

Further, in this embodiment, the other end of the spool 73 and the shaft member 51b are compressed by the compression coil spring 82.
The feedback means 78 provided between and is pressed against the shaft member 51a side via the spool 78 and the transmission member 77, whereby the feedback means 78 such as the compression coil spring 82 is attached in a predetermined direction. As in the case where the biasing means for biasing is provided on the feedback means 78 side, a predetermined biasing force is always applied by the compression coil spring 82 without causing rattling between the feedback means 78 and the spool 73 or the transmission member 77. Since the feedback means 78 is pressed against the shaft member 51a side via the spool 73 and the transmission member 77, the responsiveness of the spool 73 during the operation of the feedback means 78 is enhanced and the controllability is improved.

In this embodiment, the toroidal type continuously variable transmission 30 is equipped with a hydraulic control device 70 configured to control the operation of each trunnion 49a, 49b in the device 30 and a hydraulic pressure in the device. Although the configuration of the control valve 71 has been described, the hydraulic control device 70 according to the present invention or a device whose operation is controlled by the hydraulic control valve 71 constituting the device 70 is limited to the toroidal type continuously variable transmission 30. It goes without saying that the present invention can be applied to various types of equipment, not just things.

The case where the rotation of the spool 73 is converted into the movement in the axial direction by the transmission member 77 has been described. However, the construction of the transmission member 77 is such that the spool 73 is axially moved by a predetermined driving means. When the spool 73 and the feedback means 78 are moved relative to each other, the spool 73 is moved together with the feedback means 78 when the feedback means 78 moves the spool 73. It is possible to directly move the spool 73 in the axial direction by a predetermined driving means without rotating the 73.

[0041]

As described above, according to the first aspect of the invention, the one-way transmission means relatively moves the spool and the feedback means so that the input port and the output port communicate with each other when the spool is moved by the drive means. Is allowed, and the spool is moved together with the feedback means so as to block the input port and the output port when the spool is moved by the feedback means. It is possible to control the supply and discharge of hydraulic oil to and from the hydraulic cylinder by simply moving the hydraulic control valve to, and the hydraulic control valve in the hydraulic control device can have a two-layer structure including a valve body and a spool. As a result, the number of parts is reduced as compared with the conventional hydraulic control valve of this type having three layers of a valve body, a sleeve, and a spool, which simplifies the structure. As a result, the size and weight are reduced, the layout is improved, the number of parts is reduced, and the structure is simplified, so that the failure rate can be reduced. Further, since the hydraulic control valve has a two-layer structure, the number of parts where oil leakage may occur is reduced as compared with the case where the hydraulic control valve has a three-layer structure, and the controllability is improved.

According to the second aspect of the invention, similarly to the first aspect of the invention, the hydraulic control valve in the hydraulic control device provided in the toroidal type continuously variable transmission has a two-layer structure including a valve body and a spool. It is possible to reduce the number of parts compared to the conventional three-layer structure including a valve body, a sleeve, and a spool as in this type of hydraulic control valve, and the structure is simplified to be small and lightweight. Is achieved, the layout is improved, the number of parts is reduced, and the structure is simplified, so that the failure rate can be reduced. Further, since the hydraulic control valve has a two-layer structure, the number of parts where oil leakage may occur is reduced as compared with the case where the hydraulic control valve has a three-layer structure, and the control of the toroidal type continuously variable transmission is reduced. Will be improved.

In particular, according to the third aspect of the invention, in the hydraulic control valve of the second aspect of the invention, the feedback means provided between the one end of the spool and the roller support member by the urging means includes the roller via the spool. Since it is pressed against the support member side, as in the case where the urging means is provided on the feedback means side, the urging means always keeps a predetermined amount without rattling between the feedback means and the spool. The urging force pushes the feedback means against the roller support member side via the spool, so that the responsiveness of the spool during the operation of the feedback means is improved and the controllability is improved.

[Brief description of drawings]

FIG. 1 is an overall schematic configuration diagram showing a power transmission system of a vehicle including a toroidal type continuously variable transmission equipped with a hydraulic control device according to the present invention.

FIG. 2 is an enlarged cross-sectional view showing the configuration of a toroidal type continuously variable transmission.

3 is a cross-sectional view of a first transmission unit that constitutes the toroidal type continuously variable transmission as seen from the line AA in FIG.

FIG. 4 is an enlarged cross-sectional view of a hydraulic control device.

FIG. 5 is an enlarged cross-sectional view illustrating the operation of a hydraulic control valve that constitutes the hydraulic control device.

FIG. 6 is a cross-sectional view showing a configuration of a conventional hydraulic control valve.

[Explanation of symbols]

 4 output shaft 30 toroidal type continuously variable transmission 33 input disc 34 output disc 35 roller 49a, 49b trunnion 58 hydraulic cylinder 70 hydraulic control device 71 hydraulic control valve 72 valve body 72a main port 72b, 72c first and second port 73 spool 74 stepping motor 77 transmission member 78 feedback means 82 compression coil spring

Claims (3)

[Claims] 1. A hydraulic control device comprising a hydraulic control valve for controlling supply and discharge of hydraulic oil to and from a hydraulic cylinder, the hydraulic control valve being connected to an input port connected to a hydraulic source and the hydraulic cylinder. A valve body provided with an output port; and an input port that is provided in the valve body so as to be movable in the axial direction and cuts off the input port and the output port from each other according to the amount of movement in the axial direction. A driving means for moving the spool in the axial direction so as to communicate with the input port and the output port, and a working amount of an actuated member by the hydraulic cylinder. According to the feedback means for moving the spool in the direction of blocking the input port, and when the spool is moved by the driving means. A hydraulic control device, comprising: a one-way transmission unit that allows relative movement between the spool and the feedback unit, and that moves the spool together with the feedback unit when the spool is moved by the feedback unit. 2. A pair of input / output disks arranged to face each other on a rotation shaft, and arranged between the input / output disks to rotate in contact with both disks and to be tiltable so as to be tiltable according to a tilt angle. A roller that continuously changes the rotation of the roller and transmits it to the output disk, and rotatably supports the roller,
And a hydraulic control device in a toroidal type continuously variable transmission including a roller support member that is movable by itself and tilts the roller according to the movement amount, and a hydraulic cylinder that moves the roller support member, A valve body provided with an input port to which a hydraulic control valve for controlling supply and discharge of hydraulic oil to and from the hydraulic cylinder is connected to a hydraulic source, and an output port connected to the hydraulic cylinder, and an axial direction in the valve body. Is movably installed in
A spool configured to change the communication state between the input port and the output port according to the amount of movement in the axial direction from the state in which the input port and the output port are cut off, and the rotation for rotating the spool. Drive means, feedback means for moving the spool in a direction to block the input port according to the amount of movement of the roller support member by the hydraulic cylinder, and conversion of rotation of the spool by the rotation drive means into movement in the axial direction. A one-way transmission means for allowing relative movement of the spool and the feedback means at the time of movement, and for moving the spool together with the feedback means at the time of movement of the spool by the feedback means. Hydraulic control device. 3. A pair of input / output disks arranged to face each other on a rotation shaft, and arranged between the input / output disks to rotate in contact with both disks and to be tiltable so that the input disk can be tilted according to a tilt angle. A roller that continuously changes the rotation of the roller and transmits it to the output disk, and rotatably supports the roller,
And a hydraulic control device in a toroidal type continuously variable transmission including a roller support member that is movable by itself and tilts the roller according to the movement amount, and a hydraulic cylinder that moves the roller support member, A valve body provided with an input port to which a hydraulic control valve for controlling supply and discharge of hydraulic oil to and from the hydraulic cylinder is connected to a hydraulic source, and an output port connected to the hydraulic cylinder, and an axial direction in the valve body. Is movably installed in
A spool configured to change the communication state between the input port and the output port according to the amount of movement in the axial direction from the state in which the input port and the output port are cut off, and the rotation for rotating the spool. Drive means, feedback means provided between one end of the spool and the roller support member for moving the spool in a direction of blocking the input port according to the amount of movement of the roller support member by the hydraulic cylinder, and the rotational drive The rotation of the spool by the means is converted into an axial movement, the relative movement between the spool and the feedback means is allowed during the movement, and the spool is moved together with the feedback means during the movement of the spool by the feedback means. Directional transmission means and the other end of the spool, which is installed through the spool. Hydraulic control apparatus characterized by biasing means for biasing the feedback means to the roller supporting member side.