JPH084870A - Toroidal-type continuously variable transmission - Google Patents

Abstract

PURPOSE:To achieve compactness is size and reduction in weight by forming the sub cylinder body of an oil pressure cylinder for making a power roller fall in the friction engaging state by a steel-made plate, and providing a press-fit fixing-type bush on the opening part through which the piston rod of this plate is inserted. CONSTITUTION:In a toroidal-type continuously variable transmission for transferring power by frictionally engaging input output discs with each other by the operation of an oil pressure cylinder 5, and for continuously and variably changing speed by changing the degree of falling of a power roller, the oil pressure cylinder 5 is constituted of a main cylinder body 5a housing a piston P and a sub cylinder body 5b formed by a steel-made plate for sealing the opening part. A bush 7 is fitted to the opening part of the sub cylinder body 5b, and the extension shaft part PL also serving as a piston rod is guided under sealing when the piston P is vertically moved. Thereby, the cylinder body is thinned.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toroidal type continuously variable transmission, and more particularly, to a thin-walled sub-cylinder body of a hydraulic cylinder that inverts a power roller without lowering rigidity or hydraulic sealability. In order to reduce the size and weight of the entire transmission including the transmission control unit.

[0002]

2. Description of the Related Art A toroidal type continuously variable transmission includes an input / output disk arranged to face a main shaft (input shaft), a power roller for transferring power by frictional engagement between the input / output disks, and this power roller. It is configured by a combination of a hydraulic cylinder that inverts in a frictional engagement state and a shift control unit that operates the hydraulic cylinder to change the inversion degree of the power roller to perform continuously variable transmission. Then, for the purpose of avoiding spool lock and the like in the control valve when a high pressure is applied to the hydraulic cylinder, a structure in which the body of the hydraulic cylinder and the body of the shift control unit are separately provided and fixedly held in the casing is provided. As a prior art document relating to this point, for example, JP-A-4-29659 or JP-A-5-39831.
Reference is made to the publication.

By the way, the toroidal type continuously variable transmission, which has a separate structure in which the body of the hydraulic cylinder and the body of the shift control unit are separated, has a significant increase in size, especially in the vertical direction, and accordingly, an increase in weight is avoided. Since it is not possible, size reduction (especially vertical dimension),
It was difficult to reduce the weight, leaving some room for improvement.

Although the body of a transmission is normally made of a cast aluminum alloy which is lightweight and inexpensive, the desired rigidity cannot be ensured when such members are made thin. Further, when a material having high rigidity such as cast iron is used as a constituent member of the body, it is possible to secure the rigidity, but it is accompanied by a significant weight increase which is disadvantageous in reducing the weight. Here, in order to suppress the increase in weight as much as possible, it is necessary to make it even thinner, but since it is necessary to secure the sealing property with the rod of the piston sliding in the hydraulic cylinder, the stroke amount of the piston rod is simply The following thickness could not be achieved.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to propose a toroidal type continuously variable transmission that solves the above-mentioned conventional problems and is advantageous in terms of compactness and weight reduction.

[0006]

According to the present invention, there is provided a main cylinder body having a built-in piston and an input / output disk disposed on the main shaft so as to face each other, a power roller for transferring power by frictional engagement between the input / output disks. And a hydraulic cylinder that is composed of a sub-cylinder body that is fitted to the main cylinder body and seals the opening of the main body, and that turns the power roller over in a frictionally engaged state. In the toroidal type continuously variable transmission equipped with a gear shift control unit for continuously variable gear shifting, the sub cylinder body of the hydraulic cylinder is made of a steel plate, and the gear shift control unit is adjacent to the plate. The plate is arranged so that it slides at the opening through which the piston rod of the hydraulic cylinder passes. A toroidal type continuously variable transmission, characterized in that it comprises a press-fit fixed bush for guiding.

In the toroidal type continuously variable transmission having the above-mentioned structure, the bush is a mating surface of the main cylinder body, the plate, and the body incorporating the speed change control oil passage and the lubricating oil passage in the bolt connection by superposition. The bushing shall be dimensioned to allow for assembly errors, including the tightening margin of the gasket placed in
It is preferable to use the same material as the plate.

Further, the bush has a stopper for restricting the press-fitting depth when press-fitting into the opening of the plate, or the plate has a stopper for restricting the press-fitting depth of the bush at the opening. Preferably.

[0009]

In the toroidal type continuously variable transmission in which the body of the hydraulic cylinder and the body of the speed change control unit having the control valve are assembled separately, the sub-cylinder body of the hydraulic cylinder is made of a highly rigid steel. The plate has a press-fitting fixed type bush while sliding the plate at the opening through which the piston rod of the hydraulic cylinder is inserted, which enables thinning of the plate, especially the size of the transmission, The size in the height direction can be made small (compact), and the weight of the transmission can be reduced accordingly.

[0010]

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

1 to 3 show the structure of a toroidal type continuously variable transmission according to the present invention, which is shown as an example provided with two sets of transmission mechanisms A and B. In the drawings, reference numerals 1a and 1b denote main shafts. The input discs 2a and 2b arranged on m are also output discs 3 (3a and 3b) and 4 (4a, which are also arranged on the main axis m so as to face the input discs 1a and 1b, respectively.
4b) is an input disk 1a, 1b and an output disk 2
A power roller 5 for transferring power by frictional engagement between a and 2b is a hydraulic cylinder. The hydraulic cylinder 5 is a main cylinder body 5a containing a piston P and a main cylinder body 5a. It is composed of a sub-cylinder body 5b (for example, structural carbon steel material) which is made of a highly rigid steel plate that seals the opening.

Reference numeral 6 denotes a shift control unit arranged adjacent to the sub cylinder body 5b of the hydraulic cylinder 5 (lower side of the sub cylinder body 5b). The shift control unit 6 includes a main valve body 6a, It is composed of a sub valve body 6b, a spool 6c, a rack shaft 6d, a cam 6e, etc.
Move up and down and connect to the power rollers 3, 4
Change the degree of inversion of to change the speed continuously.

Further, 7 is a bush which is press-fitted and fixed in the opening of the sub-cylinder body 5b, and this bush 7 also serves as a piston rod when moving the piston P in the hydraulic cylinder 5 up or down. The extended shaft portion P _L has a role of guiding while sliding in a hydraulically sealed state. Therefore, the axial dimension of the bush 7 is configured to be equal to or larger than the vertical stroke amount of the extension shaft portion P _L of the piston P. The extension shaft portion P _{L of the} piston P
The hydraulic seal of the sliding part of is not the body 5c described later, but
The reason why the adjustment is performed at a position where the sub-cylinder body 5b and the body 5c are above each other is to reduce the vertical dimension of the transmission.

Now, in this type of transmission, normally,
An aluminum casting sub-cylinder body 5b having a cross-sectional shape as shown in FIG. 4 is arranged. However, such a body is not easy to machine, and as described above, the reduction in the rigidity of the body due to the thinning is not caused. Unavoidable. However, in the transmission according to the present invention, the sub-cylinder body 5b forming the hydraulic cylinder 5 is changed from a normal AMIL casting member to a steel member having high rigidity, and the body 5b is formed into a flat plate. Since the bush 7 is press-fitted into the opening provided in the plate,
Machining (polishing of the mating surface of the plate with the main cylinder body, etc.) when manufacturing it is extremely easy, and the body can be made thin without lowering the rigidity. As a result, The transmission can be made compact and lightweight.

A body 5c having a sub-cylinder body 5b and a main cylinder body 5a sandwiched between them and bolted together has a gear control oil passage and a lubrication oil passage therein, and the internal pressure thereof is about 20 kg / cm ^2. 5c can be thinned within a range that does not cause a decrease in strength, and the material can be made of aluminum casting or the like.

As described above, the bush 7 has a structure in which it is press-fitted and fixed in the opening of the sub-cylinder body 5b. However, in the press-fitted fixing type, when the bush 7 is press-fitted in the sub-cylinder body 5b, The press-fitting depth may be too deep or too shallow and may not be constant, which may hinder the installation of the transmission. Therefore, the stopper S is provided in the opening h of the sub-cylinder body 5b as shown in FIG. 5, or the bush S itself is provided with the stopper S as shown in FIG.

Regarding the dimension of the bush 7 in the longitudinal direction, the main cylinder body 5a, the sub-cylinder body 5b, and the body 5c containing the speed change control oil passage and the lubricating oil passage are superposed on each other by a bolt connection and the mating surfaces thereof are joined together. It is assumed that it has a dimension L that allows an assembling error including the tightening margin of the arranged gasket g (when the gasket is tightened in the assembly of the transmission, the bush 7 is
It is essential to provide a clearance c so that the tip of the cylinder does not collide with the cylinder body 5c). The material is preferably the same material in consideration of deformation due to thermal expansion.

The respective components of the transmission according to the present invention will be described in detail below with reference to FIGS.

The speed change mechanism A changes the contact speed of the power roller 4a arranged between the input disk 1a and the output disk 2a by changing the contact state of the power roller 4a by the hydraulic cylinder 5, thereby changing the rotational speed ratio of each disk. Further, the speed change mechanism B has the same mechanism as the speed change mechanism A except that the arrangement positions of the input / output disks 1b and 2b are reversed, and the rotation speed ratio of each disk of the speed change mechanism A can be changed. Accordingly, the speed change mechanism B also changes the rotation speed ratio of each disk.

The input disks 1a and 1b are main shafts (input shafts).
It is rotatably held on the outer periphery of m through a ball spline. The main shaft m is connected to a forward / reverse switching mechanism and a torque converter (not shown), through which the rotational force of the engine is input.

A cam flange 8 is arranged on the back surface of the input disk 1a, and a cam roller 9 is arranged between the cam flange 8 and the input disk 1a. The cam roller 9 generates a force that pushes the input disk 1a toward the output disk 2a when the input disk 1a and the cam flange 8 rotate relative to each other.

The input disk 1b of the speed change mechanism B is also rotatably held on the main shaft m via a ball spline. The input disc 2b of the speed change mechanism B receives a force toward the output disc 2b by a dish plate 11 which receives a compressive force from a loading nut 10 screwed to the main shaft m.

The output disc 2a of the speed change mechanism A and the output disc 2b of the speed change mechanism B are rotatably held by the main shaft m via the respective bearings, and the output discs 2a and 2b rotate in synchronization with them. Drive gear 1
2 are provided. The drive gear 12 further meshes with a driven gear 14 (this gear is connected to the intermediate shaft by a spline) provided at one end of an intermediate shaft 13 arranged parallel to the main shaft m.

A gear 13a integral with the intermediate shaft 13 is provided at the other end of the intermediate shaft 13. The gear 13a meshes with a gear 15a of the output shaft 15 via an idler gear (not shown). There is.

The roller support member 16 is rotatably supported by spherical bearings 18 and 19 at upper and lower rotary shafts 17a and 17b, and is supported so as to be vertically movable.

Further, the spherical bearing 18 is fixed and held to a link post 21 provided in the casing 20 via a link 22, and the spherical bearing 19 is similarly held.
3 is supported via a link 24.

The roller support member 16 has an extension shaft portion P _L which is concentric with the rotation shaft portion 17b and is rotatable integrally with the rotation shaft portion 17b. A piston P is provided on the outer circumference of the extension shaft portion P _L , and the main cylinder body 5 a and the sub cylinder P fixed to the piston P of the extension shaft portion (having the function of a piston rod) P _L and the casing 20 by a bolt 25. The cylinder body 5b constitutes the hydraulic cylinder 5.

Oil chambers are formed above and below the piston P. By supplying hydraulic oil to the oil chamber, the piston P is moved up and down together with the extension shaft P _L also serving as the piston rod.

As described above, the shift control unit 6 disposed adjacent to the lower side of the sub-cylinder body 5b is made up of a combination of the main valve body 6a and the sub-valve body 6b. In addition to the spool 6c, a plurality of spools (not shown) and the like are incorporated.

Since the body of the hydraulic cylinder 5 and the body of the speed change control unit 6 are separately fixed and held in the casing 20, these contacts are extended shaft portions which penetrate the body of the speed change control unit 6. Only P _L. A cam 6e is provided at the lower end of the extension shaft portion P _L , and the gear ratio of the input / output disk is fed back to the gear shift control unit by this.

When the hydraulic pressure in the hydraulic cylinder 5 is controlled to move the piston P upward or downward, the direction of the force (normal direction force) acting on the power rollers 3 and 4 changes, and the roller support member 16 is inserted. In the frictional engagement state with the output discs 1 and 2, the rotary shaft portions 17a and 17b rotate about the center, and the gear ratio is changed accordingly.

When the power rollers 3 and 4 are inverted, the cylinder body is elastically deformed due to the high pressure in the hydraulic cylinder 5. In the present invention, the sub-cylinder disk 5b is made particularly thin. Also, since a member having high rigidity is used, a large deformation of the portion does not cause a problem such as leakage of hydraulic oil of the hydraulic cylinder.

[0033]

According to the present invention, even if the members constituting the transmission, particularly the cylinder body (sub-cylinder body), are made thin, the rigidity and the hydraulic sealability of the sliding portion of the piston rod are deteriorated. Therefore, the transmission can be made compact and lightweight.

[Brief description of drawings]

FIG. 1 is a structural explanatory view of a transmission according to the present invention.

FIG. 2 is a view showing a II cross section of FIG.

FIG. 3 is a view showing a II-II cross section of FIG. 1;

FIG. 4 is a sectional view of a main part of a conventional structure.

FIG. 5 is a diagram showing a cross section of a main part of the transmission according to the present invention.

FIG. 6 is a view showing a cross section of a main part of the transmission according to the present invention.

[Explanation of symbols]

1a Input Disc 1b Input Disc 2a Output Disc 2b Output Disc 3 Power Roller 4 Power Roller 5 Hydraulic Cylinder 5a Main Cylinder 5b Sub Cylinder 6 Shift Control Unit 6a Main Valve Body 6b Sub Valve Body 6c Spool 6d Rack Shaft 6e Cam 7 Bush 8 Cam Flange 9 Cam roller 10 Loading nut 11 Dish plate 12 Drive gear 13 Intermediate shaft 13a Gear 14 Driven gear 15 Output shaft 15a Gear 16 Roller support member 17a Rotating shaft 17b Rotating shaft 18 Spherical bearing 19 Spherical bearing 20 Casing 21 Link post 22 Link 23 link post 24 link 25 bolt P _L extension shaft S stopper C ₁ ring seal (Teflon etc.) h opening P piston g gasket

Claims (5)

[Claims] 1. A main cylinder body having a built-in piston, a main cylinder body having a piston, and a power roller for transmitting and receiving power by frictional engagement between the input and output disks. A hydraulic cylinder that is composed of a sub-cylinder body that seals the opening and inverts the power roller in a frictionally engaged state, and operates the hydraulic cylinder to change the degree of the inversion of the power roller to perform continuously variable transmission. In a toroidal type continuously variable transmission including a speed change control unit, a sub cylinder body of the hydraulic cylinder is made of a steel plate, and a speed change control unit is arranged adjacent to the plate, and the plate is provided. , A press-fit fixed type guide that slides and guides it at the opening through which the piston rod of the hydraulic cylinder passes. Toroidal type continuously variable transmission, characterized in that it comprises the Interview. 2. The bush includes a main cylinder body and
The plate has a dimension to allow an assembling error including a tightening margin of a gasket arranged on the mating surface in bolt connection by superposition of the plate and the body containing the shift control oil passage and the lubricating oil passage. Gearbox described. 3. The transmission according to claim 1, wherein the bush is made of the same material as the plate. 4. The transmission according to claim 1, wherein the bush has a stopper that regulates a press-fitting depth when the bush is press-fitted. 5. The transmission according to claim 1, wherein the plate has a stopper for restricting a press-fitting depth of the bush at an opening portion thereof.