JP2012087854A - Valve and toroidal continuously variable transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve capable of preventing biting into a foreign substance in oil while the valve is open to the oil in the oil, and to provide a toroidal continuously variable transmission having the above valve as a speed change control valve.SOLUTION: The speed change control valve 85 includes a valve housing 86 as a valve hole having a housing valve hole 89, and a sleeve 87 as a valve element inserted into the housing valve hole 89 and working in an immersed state in oil that fills the housing valve hole 89. The speed change control valve 85 includes a sleeve 87 as a valve hole having a sleeve valve hole 90, and a spool 88 as a valve element inserted into the sleeve valve hole 90 and working in an immersed state in the oil that fills the sleeve valve hole 90. An opening 99 of the housing valve hole 89 of the housing 86 is open in the oil. An annular magnet 100 is disposed in a circumference of the opening 99 of the valve housing 86.

Description

  The present invention relates to a valve suitably used in oil and a toroidal continuously variable transmission using the valve as a shift control valve.

  For example, a double cavity type toroidal continuously variable transmission used as a transmission for an automobile is configured as shown in FIGS. As shown in FIG. 8, an input shaft (center shaft) 1 is rotatably supported inside the casing 50, and two input side disks 2, 2 and two outputs are provided on the outer periphery of the input shaft 1. Side disks 3 and 3 are attached. An output gear 4 is rotatably supported on the outer periphery of the intermediate portion of the input shaft 1. Output side disks 3 and 3 are connected to cylindrical flange portions 4a and 4a provided at the center of the output gear 4 by spline coupling.

  The input shaft 1 is rotationally driven by a drive shaft 22 via a loading cam type pressing device 12 provided between an input side disk 2 and a cam plate 7 located on the left side in the drawing. . The output gear 4 is supported in the casing 50 via a partition wall 13 formed by coupling two members, so that the output gear 4 can rotate around the axis O of the input shaft 1 while the axis O. Directional displacement is prevented.

  The output side disks 3 and 3 are supported by needle bearings 5 and 5 interposed between the input shaft 1 so as to be rotatable about the axis O of the input shaft 1. Further, the left input side disk 2 in the figure is supported on the input shaft 1 via a ball spline 6, and the right side input disk 2 in the figure is splined to the input shaft 1. Rotates with the input shaft 1. Further, the power roller 11 (see FIG. 9) is rotatable between the inner side surfaces (concave surfaces) 2a, 2a of the input side discs 2, 2 and the inner side surfaces (concave surfaces) 3a, 3a of the output side discs 3, 3. Is sandwiched between.

  A step 2b is provided on the inner peripheral surface 2c of the input side disk 2 located on the right side in FIG. 8, and the step 1b provided on the outer peripheral surface 1a of the input shaft 1 is abutted against the step 2b. At the same time, the back surface (right surface in FIG. 8) of the input side disk 2 is abutted against the loading nut 9. Thereby, the displacement of the input side disk 2 in the direction of the axis O with respect to the input shaft 1 is substantially prevented. Further, a disc spring 8 is provided between the cam plate 7 and the flange 1d of the input shaft 1, and this disc spring 8 is a concave surface 2a, 2a, 3a of each disk 2, 2, 3, 3. , 3a and the contact surface between the peripheral surfaces 11a and 11a of the power rollers 11 and 11 are applied with a pressing force.

  FIG. 9 is a cross-sectional view taken along line AA in FIG. As shown in FIG. 9, a pair of trunnions 15, 15 that swing around a pair of pivots 14, 14 that are twisted with respect to the input shaft 1 are provided inside the casing 50. In FIG. 9, the input shaft 1 is not shown. Each trunnion 15, 15 is a pair of bent wall portions 20, 20 formed at both ends in the longitudinal direction (vertical direction in FIG. 9) of the support plate portion 16 so as to be bent toward the inner surface side of the support plate portion 16. have. The bent wall portions 20 and 20 form concave pocket portions P for accommodating the power rollers 11 in the trunnions 15 and 15. Further, the pivot shafts 14 and 14 are concentrically provided on the outer side surfaces of the bent wall portions 20 and 20, respectively.

  A circular hole 21 is formed in the center portion of the support plate portion 16, and a base end portion (first shaft portion) 23 a of the displacement shaft 23 is supported in the circular hole 21. Then, by swinging each trunnion 15, 15 about each pivot 14, 14, the inclination angle of the displacement shaft 23 supported at the center of each trunnion 15, 15 can be adjusted. In addition, each power roller 11 is rotatably supported around the tip end portion (second shaft portion) 23b of the displacement shaft 23 protruding from the inner surface of each trunnion 15, 15. 11 is sandwiched between the input disks 2 and 2 and the output disks 3 and 3. In addition, the base end part 23a and the front-end | tip part 23b of each displacement shaft 23 and 23 are mutually eccentric.

  The pivot shafts 14 and 14 of the trunnions 15 and 15 are supported so as to be swingable and displaceable in the axial direction (vertical direction in FIG. 9) with respect to the pair of yokes 23A and 23B, respectively. The horizontal movement of the trunnions 15 and 15 is restricted by 23B. Each yoke 23A, 23B is formed in a rectangular shape by pressing or forging a metal such as steel. Four circular support holes 18 are provided at the four corners of each of the yokes 23 </ b> A and 23 </ b> B, and the pivot shafts 14 provided at both ends of the trunnion 15 swing through the radial needle bearings 30. It is supported freely. Further, a circular locking hole 19 is provided in the central portion of the yokes 23A and 23B in the width direction (the left-right direction in FIG. 8). 64 and 68 are fitted inside. That is, the upper yoke 23A is swingably supported by the spherical post 64 supported by the casing 50 via the fixing member 52, and the lower yoke 23B is supported by the spherical post 68 and the drive for supporting the same. The upper cylinder body 61 of the cylinder 31 is swingably supported.

  The displacement shafts 23 and 23 provided in the trunnions 15 and 15 are provided at positions 180 degrees opposite to the input shaft 1. Further, the direction in which the distal end portion 23b of each of the displacement shafts 23, 23 is eccentric with respect to the base end portion 23a is the same direction as the rotational direction of both the disks 2, 2, 3, 3 (in FIG. (Reverse direction). Further, the eccentric direction is a direction substantially orthogonal to the direction in which the input shaft 1 is disposed. Accordingly, the power rollers 11 and 11 are supported so that they can be slightly displaced in the longitudinal direction of the input shaft 1. As a result, even if each power roller 11, 11 tends to be displaced in the axial direction of the input shaft 1 due to elastic deformation of each component member based on the thrust load generated by the pressing device 12, each component This displacement is absorbed without applying an excessive force to the member.

  Further, between the outer surface of the power roller 11 and the inner surface of the support plate portion 16 of the trunnion 15, a thrust ball bearing 24 that is a thrust rolling bearing, and a thrust needle bearing, in order from the outer surface side of the power roller 11. 25. Among these, the thrust ball bearing 24 supports the rotation of each power roller 11 while supporting the load in the thrust direction applied to each power roller 11. Each of such thrust ball bearings 24 includes a plurality of balls (hereinafter referred to as rolling elements) 26, 26, an annular retainer 27 that holds the rolling elements 26, 26 in a freely rolling manner, And an annular outer ring 28. Further, the inner ring raceway of each thrust ball bearing 24 is formed on the outer side surface (large end surface) of each power roller 11, and the outer ring raceway is formed on the inner side surface of each outer ring 28.

  The thrust needle bearing 25 is sandwiched between the inner surface of the support plate portion 16 of the trunnion 15 and the outer surface of the outer ring 28. Such a thrust needle bearing 25 supports the thrust load applied to each outer ring 28 from the power roller 11, while the power roller 11 and the outer ring 28 swing around the base end portion 23 a of each displacement shaft 23. Allow.

  Further, driving rods (trunnion shafts) 29 and 29 are provided at one end portions (lower end portions in FIG. 9) of the trunnions 15 and 15, respectively, and driving pistons ( Hydraulic pistons) 33, 33 are fixed. Each of these drive pistons 33 and 33 is oil-tightly fitted in a drive cylinder 31 constituted by an upper cylinder body 61 and a lower cylinder body 62. The drive pistons 33 and 33 and the drive cylinder 31 constitute a drive device 32 that displaces the trunnions 15 and 15 in the axial direction of the pivots 14 and 14 of the trunnions 15 and 15.

  In the case of the toroidal continuously variable transmission configured as described above, the rotation of the input shaft 1 is transmitted to the input side disks 2 and 2 via the pressing device 12. Then, the rotation of the input side disks 2 and 2 is transmitted to the output side disks 3 and 3 via the pair of power rollers 11 and 11, and the rotation of the output side disks 3 and 3 is further transmitted to the output gear 4. It is taken out more.

  When changing the rotational speed ratio between the input shaft 1 and the output gear 4, the pair of drive pistons 33, 33 are displaced in opposite directions. As the drive pistons 33 and 33 are displaced, the pair of trunnions 15 and 15 are displaced in directions opposite to each other. For example, the power roller 11 on the left side of FIG. 9 is displaced downward in the figure, and the power roller 11 on the right side of FIG. 9 is displaced upward in the figure. As a result, the peripheral surfaces 11a and 11a of the power rollers 11 and 11 act on contact portions of the input side disks 2 and 2 and the inner side surfaces 2a, 2a, 3a and 3a of the output side disks 3 and 3, respectively. The direction of the tangential force changes. As the force changes, the trunnions 15 and 15 swing (tilt) in opposite directions around the pivots 14 and 14 pivotally supported by the yokes 23A and 23B.

  As a result, the contact position between the peripheral surfaces 11a and 11a of the power rollers 11 and 11 and the inner surfaces 2a and 3a changes, and the gear ratio between the input shaft 1 and the output gear 4 changes. Further, when the torque transmitted between the input shaft 1 and the output gear 4 fluctuates and the amount of elastic deformation of each component changes, the power rollers 11 and 11 and the outer rings attached to the power rollers 11 and 11 will be described. 28 and 28 slightly rotate around the base end portions 23a and 23a of the displacement shafts 23 and 23, respectively. Since the thrust needle bearings 25 and 25 exist between the outer side surfaces of the outer rings 28 and 28 and the inner side surfaces of the support plate portions 16 constituting the trunnions 15 and 15, respectively, the rotation is performed smoothly. Is called. Therefore, as described above, the force for changing the inclination angle of each displacement shaft 23, 23 can be small.

Pressure oil is supplied to the drive device 32 of such a toroidal type continuously variable transmission by a hydraulic circuit whose partial outline is shown in FIG.
The drive cylinder 31 of the drive device 32 is separated into two hydraulic chambers 31a and 31b by a drive piston 33.

In this hydraulic circuit, an oil pump 71 that supplies pressure oil, a shift control valve 72 that supplies pressure oil supplied from the oil pump 71 to either the hydraulic chamber 31a or the hydraulic chamber 31b, and this shift A sleeve control unit 79 having a recess cam 74 and a link member 75 for controlling the movement of a spool 73 (described later) of the control valve 72, a stepping motor 77 and a differential pressure cylinder 78 for displacing the sleeve 76 of the speed change control valve 72 in its axial direction. And are provided.
The speed change control valve 72 includes a valve housing 80, a sleeve 76 that is displaced in the axial direction within the valve housing 80 by the stepping motor 77 or the differential pressure cylinder 78, and an axial direction by movement of the recess cam 74 and the link member 75 within the sleeve 76. And a spool 73 that is displaced to the right.

  The speed change control valve 72 includes a flow path 72a to which pressure oil is supplied from the oil pump 71, a flow path 72b communicating with one (upper) hydraulic chamber 31a of the two hydraulic chambers 31a and 31b, and the other. A flow path 72c that communicates with the (lower) hydraulic chamber 31b is connected to a discharge path 72d that discharges the pressure oil discharged from the hydraulic chambers 31a and 31b to, for example, an oil pan 81.

The transmission control valve 72 is in one of the following three states based on the relative displacement of the valve housing 80, the sleeve 76, and the spool 73.
That is, in the first state, the flow path 72b connected to one hydraulic chamber 31a communicates with the flow path 72a connected to the oil pump 71, and the flow path 72c connected to the other hydraulic chamber 31b. And the discharge path 72d.

In the second state, the flow path 72c connected to the other hydraulic chamber 31b communicates with the flow path 72a connected to the oil pump 71, and the flow path 72b connected to one hydraulic chamber 31a and the discharge The road 72d is connected.
In the third state, the flow path 72a connected to the oil pump 71 and the flow paths 72b and 72c of both hydraulic chambers 31a and 31b are blocked.

  In the first state, the pressure oil is supplied to the upper hydraulic chamber 31a and the pressure oil in the lower hydraulic chamber 31b is discharged, and the drive rod 29 connected to the drive piston 33 is moved downward in the figure. I will let you.

In the second state, the pressure oil is supplied to the lower hydraulic chamber 31b and the pressure oil in the upper hydraulic chamber 31a is discharged, and the drive rod 29 connected to the drive piston 33 is moved upward in the figure. It will be.
In the third state, the drive rod 29 does not move. In the first and second states, when the sleeve 76 and the spool 73 are slightly displaced, the area of the communication portion is changed, and the flow rate of the pressure oil can be changed.

A recess cam 74 is fixed to the end of the drive rod 29 of any one trunnion 15 among the drive rods 29 that connect each trunnion 15 and the drive piston 33 of the drive device 32. The movement of the drive rod 29, that is, the combined value of the axial displacement and the rotational displacement is transmitted to the spool 73 via the recess cam 74 and the link member 75.
This mechanism is a feedback mechanism that feeds back the displacement of the trunnion 15 based on the supply of pressure oil to the drive device 32 to the shift control valve 72 that controls the supply of pressure oil.

The gear ratio is controlled by rotating the stepping motor 77 under the control of the engine control unit (ECU), converting the rotational motion with a gear, a screw, or the like, and moving the sleeve 76 in the axial direction.
Further, the sleeve 76 is moved in the axial direction by the differential pressure cylinder 78 so as to correct the gear ratio in accordance with the torque passing through the toroidal type continuously variable transmission.
Further, the stepping motor 77 and the differential pressure cylinder 78 are connected to the sleeve 76 by the link 79a of the sleeve control unit 79 described above.

The shift control valve 72, which is the spool valve described above, includes the valve housing 80, the sleeve 76, and the spool 73 as described above. A sleeve 76 is inserted into a through hole provided in the valve housing 80 so as to be movable in the axial direction of the through hole.
A spool 73 is inserted into a through hole provided in the sleeve 76 so as to be movable in the axial direction of the through hole. The sleeve 76 and the spool 73 are immersed in oil.

In such a shift control valve 72 as a spool valve, the spool 73 functions as a valve body, and the sleeve 76 can also be moved relative to the spool 73 to switch between opening and closing of the valve. The sleeve 76 also functions as a valve body.
Therefore, the through hole of the valve housing 80 is a valve hole that holds the sleeve 76 movably in a direction in which the valve 76 is inserted and the valve opening / closing is switched. Further, the through hole of the sleeve 76 is a valve hole that holds the spool 73 movably in a direction in which the valve 73 is inserted and the valve 73 is opened and closed.

  Further, as described above, the spool 73 is connected to the external link member 75, and the sleeve 76 is connected to the external stepping motor 77 and the like, so that the openings at both ends of the through hole of the valve housing 80 are respectively in the oil. It is in an open state. Moreover, the opening part of the both ends of the through-hole of the sleeve 76 is the state open | released in oil, respectively.

The oil in a state where the shift control valve 72 is immersed is, for example, oil accumulated in the oil pan 81 or oil supplied from the oil pan 81.
Here, in the oil pan, metal pieces (iron pieces) generated by the contact of each member in the transmission are accumulated. Therefore, the metal piece is in a state of moving while floating in the oil pan due to the flow of oil generated by the suction of the oil pump in the oil pan.
If the floating metal piece (iron piece) enters the open shift control valve 72, the sleeve 76 or the spool 73 may be caught, which may cause a valve stick.

  Therefore, in the spool valve, the sliding contact surface on the outer periphery of the land portion of the spool that slides on the inner peripheral surface of the spool hole provided in the valve housing in order to prevent the foreign matter such as the metal piece as described above from being caught. In addition, it has been proposed that a concave groove such as a V-groove or a U-groove is provided so that contaminants as foreign matter are accumulated in the concave groove to prevent the spool from moving smoothly due to the contamination. (For example, refer to Patent Document 1).

  Further, in the spool valve, it has been proposed that when a foreign object enters the inside, the outer peripheral surface of the spool has a shape in which a foreign object such as a metal piece is difficult to bite (see, for example, Patent Document 2).

JP 2001-241559 A JP 2002-48252 A

  By the way, in the inventions of Patent Document 1 and Patent Document 2 described above, entry of foreign matter into the inside of the valve housing in which the spool of the spool valve is arranged is not prevented, and when the foreign matter reaches the spool, The valve stick is prevented from being generated based on the shape.

However, since foreign matter has entered the spool portion of the valve housing, it is not always possible to sufficiently prevent the valve stick from being generated.
For example, the invention of Patent Document 1 cannot cope with the intrusion of foreign matter larger than the concave groove or a large amount of foreign matter that overflows the concave groove.
Further, in the invention of Patent Document 2, even if the shape of the spool is difficult to bite foreign matter, the spool may easily bite foreign matter depending on the shape of the foreign matter.

  The present invention has been made in view of the above circumstances, and has a shape that is open to the oil in the oil, can prevent the foreign matter in the oil from being caught, and a toroidal that includes this valve as a shift control valve. It aims at providing a type continuously variable transmission.

In order to achieve the object, the valve according to claim 1 is inserted into the valve hole portion including the valve hole and the oil filled in the valve hole. A valve body that is actuated by, wherein an opening of the valve hole is opened in oil,
Magnetic force generating means is provided in the vicinity of the opening of the valve hole of the valve hole.

  In the invention according to claim 1, there is a possibility that a metal piece in the oil enters the valve hole and hinders the operation of the valve due to the valve hole having the opening opened in the oil. By collecting the foreign matter, which is a magnetic substance adsorbed to the magnet such as iron pieces and iron powder, by the magnetic force generating means such as magnets and electromagnets, the smooth operation of the valve is hindered by the foreign substances made of these magnetic substances. Can be prevented.

The valve according to claim 2 includes a valve hole portion including a valve hole, and a valve body that is inserted into the valve hole and operates in a state of being immersed in oil filled in the valve hole. , A valve in which the opening of the valve hole is opened in oil,
The valve body has an outer diameter substantially the same as the inner diameter of the valve hole, and slides on the inner peripheral surface of the valve hole along the axial direction of the valve hole, A small diameter provided at the end along the axial direction of the valve hole and having an outer peripheral surface that is arranged away from the inner peripheral surface of the valve hole by having an outer diameter smaller than the inner diameter of the valve hole. And a magnetic force generating means is provided at the small diameter portion of the end portion of the valve body.

  In the second aspect of the invention, similar to the first aspect of the invention, there is a possibility that the metal piece may enter the valve hole and hinder the operation of the valve. It is possible to collect foreign substances that are magnetic bodies adsorbed on magnets such as iron powder. Therefore, it is possible to prevent the smooth operation of the valve from being hindered by the foreign matter made of these magnetic materials. In addition, there is a possibility that a problem may occur if foreign matter is caught between the outer peripheral surface of the sliding portion (large diameter portion) of the valve body and the inner peripheral surface of the valve hole. Since it is provided at the small diameter part of the end of the valve body close to the opening, foreign matter is collected by the magnetic force generating means of the valve body, so that the outer peripheral surface of the sliding part and the inner peripheral surface of the valve hole It is possible to prevent a foreign substance made of a magnetic material from being caught therebetween.

The valve according to claim 3 includes a valve hole portion including a valve hole, and a valve body that is inserted into the valve hole and operates in a state of being immersed in oil filled in the valve hole. , A valve in which the opening of the valve hole is opened in oil,
The oil pump is used in a hydraulic circuit using pressure oil supplied from an oil pump, and an inlet of the oil pump is provided in the vicinity of the opening of the valve hole of the valve hole.

In the invention according to claim 3, since the oil pump suction port is located near the opening of the valve hole of the valve hole, foreign matter near the opening of the valve hole is sucked into the suction port, and the foreign matter valve hole Intrusion into the interior is blocked. Thereby, generation | occurrence | production of the malfunctioning of a valve by biting in a foreign material etc. can be suppressed.
In addition, since a problem arises when foreign matter reaches the inside of the oil pump, it is necessary to place a filter between the suction port and the oil pump, but there is a possibility that foreign matter may be mixed in the oil to be sucked. In addition, a filter is basically arranged on the suction side of the oil pump.

The valve according to claim 4 includes a valve hole portion including a valve hole, and a valve body that is inserted into the valve hole and operates in a state of being immersed in oil filled in the valve hole. , A valve in which the opening of the valve hole is opened in oil,
It is used in a hydraulic circuit using pressure oil supplied from an oil pump, and a drain port for discharging oil returning from the hydraulic circuit is provided in the vicinity of the opening of the valve hole of the valve hole. .

  In the invention described in claim 4, oil is discharged from the drain port in the vicinity of the opening of the valve hole of the valve hole, thereby preventing oil that may contain foreign matter from entering the valve hole. Since a filter is basically provided on the suction side of the oil pump that may suck in foreign matter, oil that has passed through the filter is supplied from the oil pump to the hydraulic circuit. Therefore, the oil that returns from the hydraulic circuit and is discharged from the drain port of the valve passes through the filter by the oil pump, and does not contain foreign matter except for fine one that passes through the filter. By supplying the oil from which the foreign matter has been removed to the vicinity of the opening of the valve hole, the oil containing the foreign matter around the valve hole is kept away. Thereby, generation | occurrence | production of the malfunctioning of a valve by biting in a foreign material etc. can be suppressed.

The valve according to claim 5 includes a valve hole portion including a valve hole, and a valve body that is inserted into the valve hole and operates in a state of being immersed in oil filled in the valve hole. , A valve in which the opening of the valve hole is opened in oil,
An outer peripheral surface of the valve body or an inner peripheral surface of the valve hole, which is provided between an outer peripheral surface of a portion of the valve body that is disposed near the opening of the valve hole and an inner peripheral surface of the valve hole. It is characterized by having a seal ring that slides.

  In invention of Claim 5, it can suppress that the oil containing a foreign material penetrate | invades between the outer peripheral surface of a valve body and the inner peripheral surface of a valve hole with a seal ring. Thereby, generation | occurrence | production of the malfunctioning of a valve by biting in a foreign material etc. can be suppressed. It should be noted that oil is filled between the outer peripheral surface of the valve body and the inner peripheral surface of the valve hole.

  The valve according to claim 6 is used in a hydraulic circuit using pressure oil supplied from an oil pump in the invention according to claim 5, and the hydraulic circuit is provided on the opening side of the valve hole of the valve body. A drain port for discharging the oil returning from the tank is provided, and the drain port and the outside are partitioned by a filter.

  In the invention described in claim 6, the seal ring prevents the inflow of oil containing foreign matter between the outer peripheral surface of the valve body and the inner peripheral surface of the valve hole, and allows foreign matter to enter the valve body from the drain port. It is possible to prevent the contained oil from entering (backflowing). Thereby, generation | occurrence | production of the malfunctioning of a valve by biting in a foreign material etc. can be suppressed.

The valve according to claim 7 includes a valve hole portion including a valve hole, and a valve body that is inserted into the valve hole and operates in a state of being immersed in oil filled in the valve hole. , A valve in which the opening of the valve hole is opened in oil,
A valve housing, a sleeve, and a spool;
The valve housing is a valve hole portion including a valve hole into which the sleeve as the valve body is inserted,
The sleeve is a valve hole portion including a valve hole into which the spool as the valve body is inserted,
Used in a hydraulic circuit using pressure oil supplied from an oil pump, provided with a drain port for discharging oil returning from the hydraulic circuit to the sleeve as the valve body,
A gap is provided between the inner peripheral surface of the end of the valve hole of the valve housing and the outer peripheral surface of the sleeve facing the inner peripheral surface,
A gap is provided between the inner peripheral surface of the end of the valve hole of the sleeve and the outer peripheral surface of the spool facing the inner peripheral surface,
Oil discharged from the drain port is discharged through each of the gaps.

  In the seventh aspect of the present invention, the oil from which the foreign matter has been removed as described above is discharged from the gap between the valve housing and the sleeve and the gap between the sleeve and the spool, thereby removing the foreign matter from the gap. It is possible to prevent the oil contained therein from entering. Thereby, generation | occurrence | production of the malfunctioning of a valve by biting in a foreign material etc. can be suppressed.

9. A toroidal continuously variable transmission according to claim 8, wherein the input side disc and the output side disc are supported concentrically and rotatably, with the respective inner surfaces facing each other, and the input side disc. And a power roller sandwiched between the output side disc and the output side disc, and tilted about a pivot that is twisted with respect to a central axis of the input side disc and the output side disc, and the power roller A trunnion that is rotatably supported, and a drive means that drives the trunnion in the axial direction of the pivot,
The drive means includes a drive rod provided at one end of the trunnion along the axial direction of the pivot, a drive piston provided on the drive rod and disposed in the drive cylinder, and a drive piston in the drive cylinder. An oil pump that supplies pressure oil to the two hydraulic chambers to be partitioned, and a shift control valve that supplies the pressure oil supplied from the oil pump by switching to one of the two hydraulic chambers via a hydraulic circuit are provided. Toroidal type continuously variable transmission
The valve according to any one of claims 1 to 7 is used as the shift control valve.

  According to the eighth aspect of the present invention, in the shift control valve of the toroidal-type continuously variable transmission, foreign matter is introduced from the opening of the valve hole into the valve body portion that is disposed in the valve hole and immersed in oil. It is possible to suppress the intrusion of the contained oil and operate the shift control valve smoothly.

  According to the valve and the toroidal-type continuously variable transmission of the present invention, the valve hole portion including the valve hole and the valve hole portion inserted into the valve hole and operated in a state of being immersed in oil filled in the valve hole In the valve including the valve body to be operated, for example, oil including foreign matter in the oil pan can be prevented from entering from the opening of the valve hole, and the valve can be operated smoothly.

It is a schematic sectional drawing which shows the valve which concerns on 1st Embodiment of this invention. It is a schematic sectional drawing which shows the modification of the said valve. It is a schematic sectional drawing which shows the valve which concerns on 2nd Embodiment of this invention. It is a schematic sectional drawing which shows the valve which concerns on 3rd Embodiment of this invention. It is a schematic sectional drawing which shows the valve which concerns on 4th Embodiment of this invention. It is sectional drawing which shows the valve which concerns on 5th Embodiment of this invention. It is a schematic sectional drawing which shows the valve which concerns on 6th Embodiment of this invention. It is sectional drawing which shows an example of the specific structure of the half toroidal type continuously variable transmission conventionally known. It is sectional drawing which follows the AA line of FIG. It is the schematic which shows a part of hydraulic circuit provided with the shift control valve of the said half toroidal type transmission.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The toroidal type continuously variable transmission according to this embodiment is inserted into the valve hole having the valve hole and the valve hole, and operates in a state immersed in the oil filled in the valve hole. And a shift control valve which is a valve in which the opening of the valve hole is opened in oil. The characteristics of the toroidal type continuously variable transmission according to the embodiment described below lies in the structure of the shift control valve, and the other configurations and operations are the same as the conventional configurations and operations described above. Only the characteristic part of the embodiment will be mentioned, and the description of other parts will be omitted.

As shown in FIG. 1, the speed change control valve 85 of the first embodiment is a spool valve including a valve housing 86, a sleeve 87, and a spool 88. The basic structure of the spool valve is the same as that of the conventional spool valve. It has become.
The valve housing 86 is provided with a housing valve hole 89 as a through hole penetrating the valve housing 86. The housing valve hole 89 is formed in a cylindrical shape, and a substantially cylindrical sleeve 87 is inserted into the housing valve hole 89.

  The valve housing 86 has a source pressure port (not shown) to which a flow path 72 a to which pressure oil from the oil pump 71 is supplied is connected to the central portion in the axial direction, and the source pressure port extends along the housing valve hole 89. An upper port (not shown) provided side by side and connected to one (upper) hydraulic chamber 31a of the drive cylinder 31 is connected to the other side of the original pressure port along the housing valve hole 89. A lower port (not shown) is formed which is provided on the side and to which a flow path 72c communicating with the other (lower) hydraulic chamber 31b of the drive cylinder 31 is connected.

  The housing valve hole 89 and the sleeve 87 are coaxially arranged, and the sleeve 87 in the housing valve hole 89 is movable in the axial direction of the housing valve hole 89 and the sleeve 87 with respect to the valve housing 86.

The sleeve 87 includes a sleeve side source pressure port 91 that can communicate with the source pressure port of the valve housing 86, a sleeve side upper port 92 that can communicate with the upper port of the valve housing 86, and a sleeve that can communicate with the lower port of the valve housing 86. The lower side port 93 is provided.
The sleeve 87 has its outer peripheral surface in contact with the inner peripheral surface of the housing valve hole 89 except for the portion of the original pressure port 91, the upper port 92 and the lower port 93 on the sleeve side, and the sleeve 87 is moved in the axial direction. Further, the outer peripheral surface of the sleeve 87 is in sliding contact with the inner peripheral surface of the housing valve hole 89.

  The sleeve 87 is provided such that a sleeve valve hole 90 as a through hole penetrating the sleeve 87 is coaxial with the sleeve 87 body. The sleeve valve hole 90 is formed in a cylindrical shape, and a substantially cylindrical spool 88 is inserted into the sleeve valve hole 90.

The sleeve valve hole 90 and the spool 88 are coaxially arranged, and the spool 88 in the sleeve valve hole 90 is movable in the axial direction of the sleeve valve hole 90 and the spool 88 with respect to the sleeve 87.
Therefore, the sleeve 87 and the spool 88 are movable along the same axial direction, and are relatively movable.

The spool 88 includes large diameter portions (sliding portions) 94, 95 at both left and right end portions, a central small diameter portion 96 therebetween, a left end small diameter portion 97 provided outside the left and right large diameter portions 94, 95, and A right end small diameter portion 98.
The outer diameters of the large diameter portions 94 and 95 are substantially the same as the inner diameter of the housing valve hole 89. When the spool 88 is moved in the axial direction with the spool 88 inserted into the sleeve valve hole 90, the sleeve valve hole 90 is obtained. The outer peripheral surface of the spool 88 is in sliding contact with the inner peripheral surface.

The large diameter portion 94 on the left side of the spool 88 in the drawing corresponds to the upper port 92 on the left side in the drawing, and the large diameter portion 95 on the right side in the drawing corresponds to the lower port 93 on the right side in the drawing in the drawing. .
When the left large-diameter portion 94 is arranged so as to overlap the upper port 92, the right large-diameter portion 95 overlaps the lower port 93. In this state, the left and right large diameter portions 94 and 95 close the left and right upper ports 92 and lower ports 93. At this time, the original pressure port 91 of the sleeve 87 overlaps the portion of the small diameter portion 96 at the center of the spool 88, and a gap between the outer peripheral surface of the small diameter portion 96 of the spool 88 and the inner peripheral surface of the sleeve valve hole 90. And the source pressure port 91 communicate with each other.

  However, as described above, the left and right large-diameter portions 94 and 95 block the upper port 92 and the lower port 93 in the upper port 92 and the lower port 93. Further, when the outer peripheral surfaces of the left and right large-diameter portions 94 and 95 abut against the inner peripheral surface of the sleeve valve hole 90, the original pressure port 91 and the small-diameter portion 96 that communicate with each other are connected to the upper port 92 and the lower port 93. In addition to blocking, it also blocks outside.

  When the spool 88 is moved relative to the sleeve 87 to the left in the figure, the left large diameter portion 94 opens the upper port 92. Further, a small-diameter portion 96 at the center of the spool 88 communicates the upper port 92 and the original pressure port 91, and supplies the pressure oil from the oil pump 71 to the upper hydraulic chamber 31a via the flow path 72b. At this time, the lower port 93 and the small-diameter portion 98 on the right side overlap, and after the pressure oil discharged from the lower hydraulic chamber 31b passes through the flow path 72c, it is discharged to the outside through the lower port 93 and the small-diameter portion 98. Is done.

  When the spool 88 is moved to the right in the figure relative to the sleeve 87, the large diameter portion 95 on the right opens the lower port 93, and the small diameter portion 96 in the center of the spool 88 is the lower port 93 and the original pressure port. 91, and the pressure oil from the oil pump 71 is supplied to the lower hydraulic chamber 31b through the flow path 72c. At this time, the large diameter portion 94 on the left side opens the upper port 92, the upper port 92 and the small diameter portion 97 on the left side overlap, and the pressure oil discharged from the upper hydraulic chamber 31a passes through the flow path 72b. Later, it is discharged to the outside through the upper port 92 and the small diameter portion 97.

  In the speed change control valve 85, as described above, the valve housing 86 having the housing valve hole 89 with respect to the sleeve 87 is a valve hole portion, and the sleeve 87 is a valve body. A sleeve 87 having a sleeve valve hole 90 with respect to the spool 88 is a valve hole portion, and the spool 88 is a valve body. The sleeve 87 and the spool 88 can be regarded as a valve body with the valve housing 86 as a valve hole.

In the speed change control valve 85 as the valve of this example, the left and right openings 99 of the housing valve hole 89 penetrating the valve housing 86 are in the oil such as the oil pan 81 and are open to the oil. ing. Therefore, the housing valve hole 89 is also filled with oil, and the spool 88 and the sleeve 87 as the valve body are immersed in the oil.
Further, the oil pump 71 sucks oil accumulated in the oil pan as pressure oil, for example.

In the valve housing 86 of the speed change control valve 85, an annular magnet 100 is provided as a magnetic force generating means so as to surround the opening 99 slightly outside the openings 99 at both left and right ends of the housing valve hole 89.
The magnet 100 attracts iron pieces and iron powder as a magnetic material. A plurality of magnets 100 may be arranged around the opening 99 so as to surround the opening 99 of the valve housing 86 without making the magnet 100 annular. Basically, the magnet 100 may be arranged around the opening 99, but it is preferable that the magnet 100 is arranged so as to surround the opening 99 without any gap.

  In this speed change control valve 85, as described above, the magnet 100 provided around the left and right openings 99 of the housing valve hole 89 opens a foreign substance that is a magnetic body attracted to the magnet 100 such as an iron piece. Collected outside the part 99. As a result, the intrusion of a foreign substance, which is a magnetic substance, into the housing valve hole 89 is suppressed, and the transmission control valve 85 prevents the foreign substance from being caught between members such as the spool 88, the sleeve 87, and the valve housing 86. Can be prevented.

  Basically, in a machine in which the valve of this embodiment such as a toroidal continuously variable transmission is arranged, if the parts are made of iron, the foreign matter mixed in the oil is basically an iron piece, and a magnet 100 can collect foreign matter in the oil.

  In addition, when the machine in which the valve is disposed includes an aluminum alloy other than iron or a synthetic resin member, the foreign matter includes an aluminum piece and a resin piece. By configuring with iron, even if the speed change control valve 85 bites an aluminum piece or a resin piece, since the aluminum piece or the resin piece is softer than iron, they are deformed and the biting is released, so that the problem hardly occurs. . Note that the shift control valve 85 may be made of anodized aluminum (anodized) or aluminum having a high hardness instead of iron.

  Basically, the oil does not pass through the housing valve hole 89 that is the through hole of the speed change control valve 85 or the sleeve valve hole 90 as a flow path, and the opening 99 is moved by the movement of the spool 88 or the sleeve 87. Since oil flows back and forth near the nozzle or flows due to the operation of the oil pump 71, there is only a possibility that foreign matter may enter the housing valve hole 89 and the sleeve valve hole 90. It is possible to collect foreign substances consisting of

Next, a modification of the first embodiment will be described.
As shown in FIG. 2, in the speed change control valve 85a of the modification, the configuration other than the arrangement position of the magnet 101 of the valve housing 86a is the same as that of the speed change control valve 85 of the first embodiment shown in FIG. ing.
In the modification, the magnet 101 is provided in the opening 99 of the housing valve hole 89 of the valve housing 86a. That is, the opening 99 of the housing valve hole 89 of the valve housing 86 a is configured by the magnet 101, and the inner peripheral side of the annular magnet 101 is exposed to the inner peripheral surface side of the housing valve hole 89.

  Even in the speed change control valve 85a of this modification, the same effect as that of the speed change control valve 85 of the second embodiment described above can be obtained, and foreign matter drifting in the central portion of the opening 99 is further collected. It can be in an easy state.

Next, a second embodiment of the present invention will be described.
As shown in FIG. 3, the speed change control valve 85b of the second embodiment is the same as the speed change control valve 85 of the first embodiment except that the arrangement position of the magnet 102 is not the valve housing 86b but the spool 88b. It has the same configuration.
In the second embodiment, magnets 102 are provided on the left and right ends of the spool 88b, not on the valve housing 86b. The magnet 102 is provided in the small diameter portions 97 and 98 at the left and right end portions outside the large diameter portions (sliding portions) 94 and 95 of the spool 88b.

In the speed change control valve 85b of the second embodiment, foreign matter made of a magnetic material is collected by the magnet 102, and foreign matter can be prevented from getting caught in the speed change control valve 85b.
Further, since the small diameter portions 97 and 98 at the left and right end portions of the spool 88 are inside the opening 99 of the housing valve hole 89, foreign matter enters the housing valve hole 89. The invading foreign matter is also collected, and the same effect as when the magnets 100 and 101 are provided in the opening 99 of the valve housing 86 or the periphery thereof can be obtained in preventing the foreign matter from being caught. it can.

  The spool 88 may be provided with a rod for driving the spool 88 in the axial direction. When the rod is integrally connected to one of the small diameter portions 97 and 98, the attachment position of the magnet 102 is basically outside the large diameter portions 94 and 95 and the housing of the valve housing 86b. The position is inside the end of the valve hole 89. In this case, the side to which the magnet is attached is the spool 88, and the outside of the magnet is the rod described above.

Next, a third embodiment of the present invention will be described.
As shown in FIG. 4, the speed change control valve 85c of the third embodiment is provided with the suction port 103 of the oil pump 71 in the vicinity of the opening 99 of the housing valve hole 89 of the valve housing 86c without providing magnetic force generating means. The other configuration is the same as that of the first embodiment.

  In the third embodiment, the suction port 103 of the oil pump 71 is provided in the vicinity of the opening 99 on the inner peripheral surface of the housing valve hole 89 of the valve housing 86c. The shift control valve 85c is in the oil reservoir such as the oil pan 81 as described above, and since the opening 99 of the housing valve hole 89 of the valve housing 86c is opened in the oil, the oil pump 71 extends from the housing valve hole 89. Can suck oil.

  Therefore, when the oil pump 71 is in operation, that is, when the device incorporating the toroidal transmission is in operation, oil is sucked from the suction port 103 by the oil pump 71. The oil pump 71 supplies oil not only to the toroidal type continuously variable transmission, but also to other parts of the toroidal type continuously variable transmission, and the oil is supplied by the transmission control valve 85c. Even in a stopped state, the oil pump 71 sucks oil.

  In the speed change control valve 85c of the third embodiment, for example, even if there is a foreign substance in the hot water reservoir, the foreign substance is sucked into the suction port 103, so that the foreign substance is prevented from being caught. Since the oil does not flow through the housing valve hole 89 of the speed change control valve 85c as described above, foreign matter before entering the valve housing 86c is sucked from the suction port 103, so that the speed change control valve. In 85c, it is possible to suppress biting of foreign matter.

  The oil pump 71 sucks foreign matter. A filter is provided on the suction side of the oil pump 71. The sucked foreign matter is collected by the filter, and the foreign matter is sucked into the oil pump 71. It is prevented from being done.

Next, a fourth embodiment of the present invention will be described.
As shown in FIG. 5, the speed change control valve 85d of the fourth embodiment is provided with an oil pump 71 in the vicinity of the opening of the housing valve hole 89 of the valve housing 86d without providing magnetic force generating means in the valve housing 86d. It has the structure which provided the drain port 104 which discharges | emits the oil which returns from, and has the structure similar to 1st Embodiment other than that.

  In the fourth embodiment, an oil drain port 104 that is supplied from the oil pump 71 to the hydraulic circuit and returns from the hydraulic circuit is provided in the vicinity of the opening 99 on the inner peripheral surface of the housing valve hole 89 of the valve housing 86c. The shift control valve 85c is in the oil reservoir such as the oil pan 81 as described above, and there is no problem even if oil is discharged from the shift control valve 85 portion. The oil returning from the hydraulic circuit is basically supplied from the other hydraulic chamber when pressure oil is supplied to one hydraulic chamber of two hydraulic chambers of the cylinder device, for example, by a pressure control valve similar to the shift control valve 85c. Oil that is discharged.

For example, the drain port 104 is provided by connecting a drain pipe of another pressure control valve provided in a hydraulic circuit including the shift control valve 85d. A flow path for oil discharged from the hydraulic chambers 31a and 31b of the drive cylinder 31 described above is provided in the valve housing 86d of the speed change control valve 85d, and this flow path is provided on the inner peripheral surface of the housing valve hole 89 of the valve housing 86d. You may make it connect with the drain port 104 provided in the vicinity of the opening part 99 of this.
That is, the oil discharged from any part of the hydraulic circuit may be used as long as it is discharged (returned) from the hydraulic circuit, and the drain port 104 which is the end of the oil discharge flow path is the housing valve hole 89 of the valve housing 86. As long as it is provided in the vicinity of the opening 99 on the inner peripheral surface.

  The oil supplied from the oil pump 71 to the hydraulic circuit passes through the filter by the oil pump 71, and does not include foreign matter that cannot pass through the filter. The oil from which the foreign matter has been removed passes through the hydraulic circuit. , And is discharged from the drain port 104. Therefore, the vicinity of the opening 99 of the housing valve hole 89 provided with the drain port 104 is filled with oil containing no foreign matter.

  In the shift control valve 85d of the fourth embodiment, the filter of the oil pump 71 passes through the drain port 104 provided in the vicinity of the opening 99 on the inner peripheral surface of the housing valve hole 89 of the valve housing 86 as described above. Oil from which foreign objects have been removed is discharged. The oil from which the foreign matter has been removed is filled in the vicinity of the opening 99 in the housing valve hole 89. Therefore, it is possible to prevent the shift control valve 85d from biting in foreign matter.

Next, a transmission control valve 85e according to a fifth embodiment of the present invention will be described.
As shown in FIG. 6, the speed change control valve 85e of the fifth embodiment basically includes a valve housing 86e, a sleeve 87e, and a spool 88e, similarly to the speed change control valve 85 of the first embodiment. . Further, the pressure oil supplied from the oil pump 71 is supplied to one hydraulic chamber 31a of the drive cylinder 31 and the pressure oil in the other hydraulic chamber 31b is discharged, as in the first embodiment, and the oil pump The pressure oil supplied from 71 is supplied to the other hydraulic chamber 31b of the drive cylinder 31 and the pressure oil in one hydraulic chamber 31a is discharged, the supply of hydraulic pressure to the drive cylinder 31, and the hydraulic pressure from the drive cylinder 31 It becomes one of the states to stop discharging.

  Similar to the first embodiment, a housing valve hole 89e into which a sleeve 87e is inserted is provided in the valve housing 86e of the speed change control valve 85e. Both ends of the housing valve hole 89e are provided with openings 99e that are opened to the outside of the valve housing 86e. Further, a source pressure port 105, an upper port 106, and a lower port 107 are provided side by side in the axial direction of the housing valve hole 89e. Further, the housing valve hole 89e of the valve housing 86e is a cylindrical hole having the same diameter except for both ends thereof, the above-described original pressure port 105, the upper port 106, and the lower port 107. On the other hand, both end portions of the housing valve hole 89e are enlarged diameter portions 115 and 116 having diameters slightly larger than other portions. The enlarged diameter portions 115 and 116 are portions where seal rings 118 and 120 described later slide.

The sleeve 87e is provided with a sleeve valve hole 90e into which the spool 88e is inserted. The sleeve valve hole 90e is also opened to the outside at both ends of the sleeve 87e.
The sleeve 87e includes a sleeve-side source pressure port 91e that communicates with the source pressure port 105 of the valve housing 86e, a sleeve-side upper port 92e that communicates with the upper port 106 of the valve housing 86e, and a lower port 107 of the valve housing 86e. And a sleeve-side lower port 93e communicating therewith. The original pressure port 91e, the upper port 92e, and the lower port 93e are provided side by side along the axial direction of the cylindrical sleeve 87e, and the original pressure port 91e is disposed between the upper port 92e and the lower port 93e. Is done.

  Further, the sleeve 87e has a position along the axial direction of the sleeve 87e opposite to the original pressure port 91e with respect to the upper port 92e (a position outside the upper port 92e) and with respect to the lower port 93e. Drain ports 108 and 109 are provided at positions opposite to the pressure port 91e (positions outside the lower port 93e), respectively.

  Further, the outer peripheral surface of the sleeve 87e and the inner peripheral surface of the housing valve hole 89e of the valve housing 86e are substantially in contact with each other except for the respective port portions described above, and are in sliding contact when the sleeve 87e moves. Become. One end of the sleeve 87e extends to the outside from the housing valve hole 89e of the valve housing 86e. The link 79a is connected to a portion of the sleeve 87e extending to the outside of the valve housing 86e.

  The one end of the sleeve 87e has a flange-like shape with a large diameter at a position overlapping the enlarged diameter portion 115 formed at the right end in the drawing of the housing valve hole 89e of the valve housing 86e. A collar portion 117 is formed. A seal ring 118 is provided on the outer peripheral portion of the flange 117. The seal ring 118 is in contact with the inner peripheral surface of the enlarged diameter portion 115, and when the sleeve 87e moves in the axial direction with respect to the housing valve hole 89e, the seal ring 118 is in contact with the inner peripheral surface of the enlarged diameter portion 115. It comes to slide on. Therefore, at the end on the side where the sleeve 87e is connected to the link 79a, the space between the sleeve 87e and the valve housing 86e is sealed by the seal ring 118, so that oil does not enter from the outside. The space between the outer peripheral surface of the sleeve 87e and the inner peripheral surface of the housing valve hole 89e is filled with oil.

  Further, a filter 123 is provided inside the end of the sleeve 87e on the side where the link 79a of the sleeve valve hole 90e is connected. Accordingly, the sleeve valve hole 90e is separated from the outside by the filter 123 on one end side extending to the outside of the sleeve 87e. Oil discharged from a drain port 121 formed in a large-diameter portion 112 of a spool 88e, which will be described later, is discharged to the outside through a sleeve valve hole 90e. The discharged oil passes through a filter 123 to the outside. To be discharged. Further, the volume in the housing valve hole 89e of the valve housing 86e is changed (increased) by the movement of the spool 88e and the sleeve 87e in a state where the drain is not discharged from the drain port 121, and there is no oil in the sleeve valve hole 90e. When the oil enters in reverse, the oil that enters the sleeve valve hole 90e passes through the filter 123.

The spool 88e is provided with a large-diameter portion (sliding portion) 110 at the center and large-diameter portions (sliding portions) 111 and 112 at the left and right ends. A small diameter portion 113 is provided between the large diameter portion 110 at the center and the large diameter portion 111 on the left in the drawing, and a small diameter is provided between the large diameter portion 110 at the center and the large diameter portion 112 on the right in the drawing. A portion 114 is provided.
Further, a rod (not shown) connected to the link member 75 in contact with the above-described recess cam 74 is connected to the left end portion of the spool 88e in the drawing.

  Further, the large-diameter portion 111 on the end connected to the link member 75 has a larger diameter portion 111 than the large-diameter portion 111 at a position overlapping the enlarged-diameter portion 116 formed on the left end portion of the housing valve hole 89e in the drawing. Further, a flange-shaped flange portion 119 having a larger diameter is formed. A seal ring 120 is provided on the outer peripheral portion of the flange portion 119. The seal ring 120 abuts on the inner peripheral surface of the enlarged diameter portion 116, and when the spool 88e moves in the axial direction with respect to the housing valve hole 89e, the seal ring 120 is in contact with the inner peripheral surface of the enlarged diameter portion 116. It comes to slide on. Therefore, the space between the spool 88e and the valve housing 86e is sealed by the seal ring 120 so that oil does not enter from the outside. The oil is filled between the outer peripheral surface of the spool 88e and the inner peripheral surface of the sleeve valve hole 90e, and between the outer peripheral surface of the sleeve 87e and the inner peripheral surface of the housing valve hole 89e. Yes.

  Further, the large diameter portion 111 is provided with a drain port 122 which can communicate with the drain port 108 on the left side of the sleeve 87e in the drawing and allows the discharged oil to flow out to the end portion on the large diameter portion 111 side of the spool 88e. It has been. The drain port 122 is provided so as to intersect the main body portion at the main body portion formed along the substantially center line of the large-diameter portion 111 and the end portion of the main body portion facing the center side of the spool 88e. A communication portion capable of communicating with the drain port 108 and a drain port portion that is provided so as to intersect with an end portion of the main body portion on the end portion side of the spool 88e and open to the outer peripheral surface of the spool 88e.

The drain port 122 guides oil discharged from the drain port 108 on the left side of the sleeve 87e in the drawing to the outside of the transmission control valve 85e.
In addition, a filter 124 is provided at the end of the drain port 122 so as to be separated from the outside. Therefore, oil discharged from the drain port 122 passes through the filter 124 and is discharged to the outside. It has become.

  Further, when the drain is not discharged from the drain port 122 and the spool 88e and the sleeve 87e are moved, the volume in the housing valve hole 89e of the valve housing 86e is changed (increased), and oil is discharged into the drain port 122. Even when entering in reverse, the oil that enters the drain port 122 passes through the filter 124.

  A coil spring 125 is provided around the portion of the large diameter portion 111 exposed from the sleeve 87e. One end of the coil spring 125 engages with the flange 119 of the spool 88e, and the other end engages with an end opposite to the end connected to the link 79a of the sleeve 87e. The coil spring 125 biases the spool 88e toward the side that engages the link member 75 with respect to the sleeve 87e. Further, the coil spring 125 biases the sleeve 87e toward the side engaging the link 79a with respect to the spool 88e.

  Further, the large diameter portion 112 on the right side of the spool 88e can communicate with the drain port 109 on the right side of the sleeve 87e in the drawing, and the inside of the end portion on the side where the discharged oil extends to the outside of the sleeve 87e (the sleeve valve hole). 90e) is provided with a drain port 121 for discharging. The drain port 121 extends along the central axis of the large-diameter portion 112 and opens to the outer peripheral surface of the large-diameter portion 112 intersecting with the main body portion that opens at the right end of the spool 88e in the drawing. A communication portion capable of communicating with the port 109 is provided. As described above, the oil discharged from the drain port 121 passes through the filter 123 and is discharged to the outside of the shift control valve 85e.

  In the speed change control valve 85e, as described above, the original pressure port 105, the upper port 106, and the lower port 107 of the valve housing 86e communicate with the original pressure port 91e, the upper port 92e, and the lower port 93e of the sleeve 87e, respectively. In this state, when the main pressure port 91e of the sleeve 87e is closed by the central large-diameter portion 110 of the spool 88e, the hydraulic pressure is not sent to any of the two hydraulic chambers 31a and 31b of the drive cylinder 31, and the drive The device 32 is stopped.

  In this state, the large-diameter portion 110 at the center of the spool 88e is moved to the right side in the drawing so that the small-diameter portion 113 on the left side in the drawing of the large-diameter portion 110 overlaps the original pressure port 91e and the upper port 92e. Then, the original pressure port 91e and the upper port 92e are communicated by the small diameter portion 113. At this time, the source pressure port 91e and the source pressure port 105 communicate with each other, and the upper port 92e and the upper port 106 communicate with each other. Therefore, the source pressure port 105 and the upper port 106 of the valve housing 86e communicate with each other. . Thus, the pressure oil is supplied from the oil pump 71 to the upper hydraulic chamber 31a of the drive cylinder 31.

  Further, in this state, the small-diameter portion 114 on the right side in the drawing of the large-diameter portion 110 at the center of the spool 88e is disposed so as to overlap the lower port 93e and the drain port 109 on the right side in the drawing. At this time, the lower port 93e and the drain port 109 are communicated with each other by the small diameter portion 114. As a result, the pressure oil is supplied to the upper hydraulic chamber 31 a as described above, so that the oil in the lower hydraulic chamber 31 b pressed by the drive piston 33 communicates with the lower port 107 from the lower port 93 e. 109. Further, the discharged oil reaches the drain port 121 of the spool 88e communicating with the drain port 109, and is discharged from the drain port 121 to the left end portion of the sleeve valve hole 90e of the sleeve 87e in the drawing. As described above, the discharged oil passes through the filter 123 and is discharged to the outside of the shift control valve 85e.

  With respect to the state where the driving device 32 is stopped, the large diameter portion 110 at the center of the spool 88e is moved to the left side in the drawing, and the small diameter portion 114 on the right side in the drawing of the large diameter portion 110 is the original pressure port 91e and the lower port. If it overlaps over 93e, the original pressure port 91e and the lower port 93e are communicated by the small diameter portion 114. At this time, the source pressure port 91e and the source pressure port 105 communicate with each other, and the lower port 93e and the lower port 107 communicate with each other. Therefore, the source pressure port 105 and the lower port 107 of the valve housing 86e communicate with each other. . Thus, the pressure oil is supplied from the oil pump 71 to the lower hydraulic chamber 31b of the drive cylinder 31.

  In this state, the small-diameter portion 113 on the left side of the large-diameter portion 110 at the center of the spool 88e is arranged so as to overlap the upper port 92e and the drain port 108 on the right side of the drawing. At this time, the upper port 92e and the drain port 108 are communicated with each other by the small diameter portion 113. As a result, when the pressure oil is supplied to the lower hydraulic chamber 31b as described above, the oil in the upper hydraulic chamber 31a pressed by the drive piston 33 communicates with the upper port 106 from the upper port 92e. To 108. Further, the discharged oil reaches the drain port 122 of the spool 88e communicating with the drain port 108, passes through the filter 124 from the drain port 122, and is discharged to the outside of the shift control valve 85e.

  In this speed change control valve 85e, the sleeve 87e in the housing valve hole 89e is extended to the outside of the housing valve hole 89e in order to be connected to an external member (link 79a). On one end side of the housing valve hole 89e from which the sleeve 87e extends to the outside, the space between the outer peripheral surface of the sleeve 87e and the inner peripheral surface of the housing valve hole 89e is sealed by the seal ring 118, and external foreign matter Intrusion of oil containing is prevented.

  Further, since the spool 88e in the housing valve hole 89e (in the sleeve valve hole 90e) is connected to an external member (link member 75), the spool 88e extends outside the housing valve hole 89e. On the other end side of the housing valve hole 89e from which the spool 88e extends to the outside, the space between the outer peripheral surface of the spool 88e and the inner peripheral surface of the housing valve hole 89e is sealed by the seal ring 120, Intrusion of oil containing foreign substances is prevented.

By these two seal rings 118, 120, foreign matter is removed between the inner peripheral surface of the housing valve hole 89e and the outer peripheral surface of the sleeve 87e, and between the inner peripheral surface of the sleeve valve hole 90e and the outer peripheral surface of the spool 88e. Biting can be prevented.
Furthermore, the filter 123 is provided at one end of the sleeve valve hole 90e of the sleeve 87e, and the other end is closed by the large diameter portion 111 on the other end of the spool 88e. A drain port 122 formed in the large diameter portion 111 of the spool 88e and communicating between the inside and outside of the sleeve valve hole 90e is provided with a filter 124. Accordingly, it is possible to prevent oil containing foreign matter from entering the sleeve valve hole 90e.
Accordingly, it is possible to prevent foreign matter from entering between the inner peripheral surface of the sleeve valve hole 90e and the outer peripheral surface of the spool 88e from the side of the sleeve valve hole 90e and biting the foreign matter.
Note that, in the speed change control valve 85e, the flow rate of oil changes as the axial positions of the sleep 87e and the spool 88e change relatively.

Next, a sixth embodiment of the present invention will be described.
As shown in FIG. 7, the speed change control valve 85f of the sixth embodiment has the same basic configuration as the speed change control valve 85e of the fifth embodiment, but the flanges 117 and 119, the seal rings 118 and 120, and the filter 123. , 124 and drain ports 121, 122 are not provided, and instead, between the inner peripheral surface of the end of the housing valve hole 89f and the outer peripheral surface of the end of the sleeve 87f, the end of the sleeve valve hole 90f Communication portions 126, 127, 128, and 129, which are gaps for discharging oil, are formed between the inner peripheral surface and the large-diameter portions 111 and 112 at the ends of the spool 88e, and the sleeve 88e is formed on the spool 88e. Drain small-diameter portions 130 and 131 communicating with the drain ports 108 and 109 are provided. The valve housing 86e of the sixth embodiment has the same configuration as that of the fifth embodiment.

  In this speed change control valve 85f, the switching between the supply of pressure oil and the discharge of oil is performed in the same manner as the speed change control valve 85e of the fifth embodiment, and the configuration for this is also substantially the same. However, the oil is discharged from the drain ports 121 and 122 at both ends of the spool 88e in the shift control valve 85e of the fifth embodiment. In this example, the oil is discharged from the hydraulic chambers 31a and 31b. Oil is discharged from the communication portions 126, 127, 128, and 129 through the drain ports 108 and 109 or the drain ports 108 and 109 and the drain small diameter portions 130 and 131.

  The communication portion 126 is provided adjacent to the drain port 108 on the left side of the sleeve 87f in the drawing. Further, the communication portion 126 is provided between the inner peripheral surface of the housing valve hole 89f and the outer peripheral surface of the sleeve 87f from the drain port 108 to the left end of the sleeve 87f by slightly reducing the diameter of the sleeve 87f. Gap. Oil discharged from the drain port 108 can be discharged from the communication portion 126 that is the gap.

  The communication portion 127 is provided adjacent to the drain port 109 on the right side of the sleeve 87f in the drawing. The communication portion 127 is provided between the inner peripheral surface of the housing valve hole 89f and the outer peripheral surface of the sleeve 87f from the drain port 109 to the right end of the sleeve 87f by slightly reducing the diameter of the sleeve 87f. It is a gap. Oil discharged from the drain port 109 can be discharged from the communication portion 127 that is the gap.

  The communication portion 128 is provided adjacent to the drain small-diameter portion 130 on the left side of the spool 88f in the drawing. Further, the communication portion 128 is formed by slightly reducing the diameter of the large-diameter portion 111 of the spool 88f, so that from the drain small-diameter portion 130 to the left end of the sleeve 87f, the inner peripheral surface of the sleeve valve hole 90f and the large diameter of the sleeve 87f. It is a gap provided between the outer peripheral surface of the diameter portion 111. From the communication portion 128 that is the gap, oil that has flowed into the drain small diameter portion 130 through the drain port 108 can be discharged.

  The communication portion 129 is provided adjacent to the drain small-diameter portion 131 on the right side of the spool 88f in the drawing. Further, the communication portion 128 is formed by slightly reducing the diameter of the large diameter portion 112 of the spool 88f, so that the inner peripheral surface of the sleeve valve hole 90f and the large diameter of the sleeve 87f from the drain small diameter portion 130 to the right end of the sleeve 87f. It is a gap provided between the outer peripheral surface of the diameter portion 112. From the communication portion 129 that is the gap, oil that has flowed to the drain small diameter portion 131 through the drain port 108 can be discharged.

In such a shift control valve 85f, when oil is discharged from the lower hydraulic chamber 31b, the small-diameter portion 114 of the spool 88f causes the lower port 93f of the sleeve 87f and the drain port 109 to communicate with each other. The port 107 and the drain port 109 communicate with each other. As a result, the oil discharged from the hydraulic chamber 31b flows into the drain port 109. Part of the oil flows from the drain port 109 into the communication portion 127 adjacent to the drain port 109, and the oil is discharged to the outside from the communication portion 127.
Further, the remaining oil flowing into the drain port 109 reaches the drain small diameter portion 131 from the drain port 109, and this oil is discharged to the outside from the communication portion 129 adjacent to the drain small diameter portion 131.

  Therefore, in this state, on the right side of the valve housing 86e in the drawing, the oil from which foreign matter has been removed by the oil pump 71 is removed between the valve housing 86e and the sleeve 87f, and between the sleeve 87f and the spool 88f. It will flow out from between. This prevents foreign matter from being caught between the valve housing 86e and the sleeve 87f and between the sleeve 87f and the spool 88f.

In the shift control valve 85f, when the oil is discharged from the upper hydraulic chamber 31a, the small diameter portion 113 of the spool 88f causes the upper port 92f of the sleeve 87f and the drain port 109 to communicate with each other, whereby the upper port 106 And the drain port 108 communicate with each other. As a result, the oil discharged from the hydraulic chamber 31 a flows into the drain port 108. Part of the oil flows from the drain port 108 into the communication portion 126 adjacent to the drain port 108, and the oil is discharged to the outside from the communication portion 126.
Further, the remaining oil flowing into the drain port 108 reaches the drain small diameter portion 130 from the drain port 108, and this oil is discharged to the outside from the communication portion 128 adjacent to the drain small diameter portion 130.

  Therefore, in this state, on the left side of the valve housing 86e in the drawing, the oil from which foreign matter has been removed by the oil pump 71 is removed between the valve housing 86e and the sleeve 87f, and between the sleeve 87f and the spool 88f. It will flow out from between. This prevents foreign matter from being caught between the valve housing 86e and the sleeve 87f and between the sleeve 87f and the spool 88f.

  Note that, as described above, the oil from which foreign matter has been removed by the communication portions 126, 127, 128, and 129 may or may not be discharged depending on the situation. In view of this, the communication portions 126, 127, 128, and 129 prevent the foreign matter from entering the communication portions 126, 127, 128, and 129 when the oil is not discharged in the communication portions 126, 127, 128, and 129. It is preferable that the interval of the gaps 128 and 129 is about 0.5 mm to about 1 mm.

  The present invention can be applied to various half-toroidal continuously variable transmissions such as a single cavity type and a double cavity type, various transmissions, and general industrial machines.

2 input side disk 3 output side disk 11 power roller 14 pivot 15 trunnion 29 drive rod 31 drive cylinder 31a hydraulic chamber 31b hydraulic chamber 32 drive device (drive means)
33 Drive piston 71 Oil pump 85, 85a, 85b, 85c, 85d, 85e, 85f Speed change control valve 86, 86a, 86b, 86c, 86d, 86e Bubble housing (valve hole)
87, 87e, 87f Sleeve (valve body, valve hole)
88, 88b, 88e, 88f Spool (valve)
89, 89e, 89f Housing valve hole (valve hole)
90, 90e, 90f Sleeve valve hole 94, 95 Large diameter part (sliding part)
97, 98 Small diameter part 99 Opening part 99e Opening part 100, 101, 102 Magnet (magnetic force generating means)
103 Suction port 104 Drain port 108, 109 Drain port (drain port)
118, 120 Seal ring 121, 122 Drain port (drain port)
123, 124 Filters 126, 127, 128, 129 Communication part (gap)

Claims (8)

A valve hole having a valve hole, and a valve body that is inserted into the valve hole and operates in a state of being immersed in oil filled in the valve hole, and the opening of the valve hole is an oil A valve opened inside,
The valve characterized in that a magnetic force generating means is provided in the vicinity of the opening of the valve hole of the valve hole. A valve hole having a valve hole, and a valve body that is inserted into the valve hole and operates in a state of being immersed in oil filled in the valve hole, and the opening of the valve hole is an oil A valve opened inside,
The valve body has an outer diameter substantially the same as the inner diameter of the valve hole, and slides on the inner peripheral surface of the valve hole along the axial direction of the valve hole, A small diameter provided at the end along the axial direction of the valve hole and having an outer peripheral surface that is arranged away from the inner peripheral surface of the valve hole by having an outer diameter smaller than the inner diameter of the valve hole. And a magnetic force generating means is provided in a small diameter portion at the end of the valve body. A valve hole having a valve hole, and a valve body that is inserted into the valve hole and operates in a state of being immersed in oil filled in the valve hole, and the opening of the valve hole is an oil A valve opened inside,
A valve used in a hydraulic circuit using pressure oil supplied from an oil pump, wherein the oil pump suction port is provided near the opening of the valve hole of the valve hole. A valve hole having a valve hole, and a valve body that is inserted into the valve hole and operates in a state of being immersed in oil filled in the valve hole, and the opening of the valve hole is an oil A valve opened inside,
It is used in a hydraulic circuit using pressure oil supplied from an oil pump, and a drain port for discharging oil returning from the hydraulic circuit is provided in the vicinity of the opening of the valve hole of the valve hole. valve. A valve hole having a valve hole, and a valve body that is inserted into the valve hole and operates in a state of being immersed in oil filled in the valve hole, and the opening of the valve hole is an oil A valve opened inside,
An outer peripheral surface of the valve body or an inner peripheral surface of the valve hole, which is provided between an outer peripheral surface of a portion of the valve body that is disposed near the opening of the valve hole and an inner peripheral surface of the valve hole. A valve comprising a seal ring that slides on the valve.   Used in a hydraulic circuit using pressure oil supplied from an oil pump, a drain port for discharging oil returning from the hydraulic circuit is provided on an opening side of the valve hole of the valve body, and the drain port and the outside The valve according to claim 5, wherein the valve is partitioned by a filter. A valve hole having a valve hole, and a valve body that is inserted into the valve hole and operates in a state of being immersed in oil filled in the valve hole, and the opening of the valve hole is an oil A valve opened inside,
A valve housing, a sleeve, and a spool;
The valve housing is a valve hole portion including a valve hole into which the sleeve as the valve body is inserted,
The sleeve is a valve hole portion including a valve hole into which the spool as the valve body is inserted,
Used in a hydraulic circuit using pressure oil supplied from an oil pump, provided with a drain port for discharging oil returning from the hydraulic circuit to the sleeve as the valve body,
A gap is provided between the inner peripheral surface of the end of the valve hole of the valve housing and the outer peripheral surface of the sleeve facing the inner peripheral surface,
A gap is provided between the inner peripheral surface of the end of the valve hole of the sleeve and the outer peripheral surface of the spool facing the inner peripheral surface,
The oil discharged from the drain port is discharged through each of the gaps. An input side disk and an output side disk that are supported concentrically and rotatably with their inner side surfaces facing each other, and a power roller sandwiched between the input side disk and the output side disk A trunnion that tilts about a pivot that is twisted with respect to a central axis of the input-side disk and the output-side disk, and that rotatably supports the power roller, and a trunnion in the axial direction of the pivot Driving means for driving,
The drive means includes a drive rod provided at one end of the trunnion along the axial direction of the pivot, a drive piston provided on the drive rod and disposed in the drive cylinder, and a drive piston in the drive cylinder. An oil pump that supplies pressure oil to the two hydraulic chambers to be partitioned, and a shift control valve that supplies the pressure oil supplied from the oil pump by switching to one of the two hydraulic chambers via a hydraulic circuit are provided. Toroidal type continuously variable transmission
A toroidal continuously variable transmission using the valve according to any one of claims 1 to 7 as the shift control valve.

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