JPH07243496A - Friction car type continuously variable transmission - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the number of parts and improve assembly and operability. [Structure] Rotating shaft portion 3 of each roller support member 32
A safety gear 64 is provided on each of 2a and 32b. The respective safety gears 64 are such that adjacent rotary shaft portions 32a and 32b are meshed with each other. Adjacent rotary shaft portions 32a and 32b are rotatably supported by a substantially "L" -shaped link 50. Each link 50 is swingably supported between bifurcated arm portions 56 a formed on the link post 56 and fixed to the case 62. The safety gear 64 is arranged in a space surrounded by the link 50, between the arm portions 56a, and the case 62.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction wheel type continuously variable transmission.

[0002]

2. Description of the Related Art A conventional friction wheel type continuously variable transmission is as follows. That is, JP-A-3-7
The one disclosed in Japanese Patent No. 4667 has three or more friction rollers arranged at a substantially equal interval in the circumferential direction between a set of an input disc and an output disc, and a shift servo force is input to each friction roller. Roller supporting members are provided, and corresponding friction rollers are rotatably mounted on the intermediate portions of these roller supporting members via tilting shafts, and swings are respectively provided between adjacent end portions of the roller supporting members. Members are arranged, the ends of each roller support member are rotatably and slidably mounted on both ends of these swing members, and the middle part of each swing member is rotatably pivoted on a holding member fixed to the casing. I wore it. In addition, JP-A-63-
In Japanese Patent No. 125852, a set of four power rollers is arranged at equal intervals in the circumferential direction of a cone disc, and each power roller is rotatable in a trunnion rotatable about an individual swing axis. In order to mount and rotate the power rollers synchronously and in phase, the fan-shaped bevel gears are slidably drive-coupled to the trunnions, and the bevel gears are constantly meshed with these fan-shaped bevel gears. Is provided, the shaft of the bevel gear is rotatably supported by the transmission case, wires are respectively wound between the shaft and the trunnion, and the rotations between the shaft and the trunnion are synchronized with each other. .

[0003]

However, the conventional friction wheel type continuously variable transmission described above has the following problems.
That is, in the one disclosed in Japanese Patent Laid-Open No. 3-74667, since there is no means for synchronizing the rotational movement between the plurality of roller supporting members, the rotational movement between the respective roller supporting members is deviated. Therefore, there is a problem that the friction roller slips. Further, in Japanese Patent Application Laid-Open No. 63-125852, in order to synchronize the rotational movements of the trunnions, the adjacent trunnions are not directly connected, but a fan-shaped bevel gear, a bevel gear, and a wire are connected in combination. is doing. Therefore, there is a problem that the number of parts is increased, which deteriorates the assembling property and the operability. The present invention is intended to solve such a problem.

[0004]

The present invention as set forth in claim 1 solves the above problems by engaging gears of adjacent rotary shaft portions with each other as shown in FIG. That is, the friction wheel type continuously variable transmission of the present invention is arranged so as to make frictional contact with the input disk (10), the output disk (12), and the toroidal groove formed by the both disks. Friction rollers (2
4) and each friction roller (24) with an eccentric shaft (2
9) Rotating shaft portions (32a, 32b) that are rotatably supported via the same and are orthogonal to the axes of both disks.
Is rotatable about the above-mentioned rotation shaft portion (32a, 32)
b) an axially movable roller support member (32),
Each roller support member (32) is attached to the rotary shaft (32
a, 32b) and a hydraulic cylinder device that is drivable in the axial direction, respectively.
a, 32b) are respectively provided with gears (64), and each gear (64) has an adjacent rotating shaft portion (32a, 32a, 32b).
32b) are engaged with each other. In the friction wheel type continuously variable transmission according to the second aspect of the present invention, as shown in FIG. 2, the rotating shaft portions (32a, 32b) adjacent to each other are substantially "L" -shaped links (50). ), Each link (50) is swingably supported between the forked arm portions (56a) formed on the link post (56). Each arm (56a)
Is fixed to the case (62), and the gear (6
4) is between the link (50) and the arm portion (56a),
It may be arranged in a space surrounded by the case (62). The reference numerals in the parentheses indicate the corresponding members of the embodiments described later.

[0005]

According to the first aspect of the present invention, when the hydraulic cylinder device is operated to drive the respective roller support members in the axial direction of the rotary shaft portion, the direction of the tangential force acting on each friction roller changes. , The respective roller support members rotate around the rotation shaft portion. Since the gears of the adjacent rotary shaft portions are meshed with each other, the rotational movements of these rotary shaft portions are synchronized. As a result, since the rotational movements of all the roller supporting members are synchronized, it is possible to prevent the friction rollers from slipping due to the deviation of the rotational movements of the roller supporting members. Further, in the invention of claim 2, the adjacent rotating shaft portions are rotatably supported by the "L" -shaped links, and the links are swingable between the bifurcated arm portions formed on the link posts. All arms are fixed to the case, and gears are arranged in the space surrounded by the link, the arm portions of the link post, and the case. As a result, since the adjacent roller supporting members can be directly connected to each other by the gear, the number of parts can be reduced, and thereby the assembling property and the operability can be improved.

[0006]

1 and 2 show a friction wheel type continuously variable transmission according to the present invention. An input disk 10 and an output disk 12 are rotatably supported by an input shaft 14 via bearings 16 and 18. A cam flange 20 is arranged on the back side of the input disk 10. A cam roller 22 is provided on the cam surfaces of the cam flange 20 and the input disk 10 that face each other. The cam roller 22 receives the input disc 1 when the input disc 10 and the cam flange 20 rotate relative to each other.
It is shaped so as to generate a force for pressing 0 toward the output disk 12. Input disk 10 and output disk 1
Three friction rollers 24 are circumferentially arranged at substantially equal intervals in a toroidal groove formed by two surfaces facing each other so as to make frictional contact with both disks. Each friction roller 24 is rotatably supported by a roller support member 32 via an eccentric shaft 29. Each of the roller support members 32 is rotatably supported by a spherical bearing 38 on the upper and lower rotary shaft portions 32a and 32b orthogonal to the shaft centers of both discs and is movable in the axial direction of the rotary shaft portions 32a and 32b. ing. Adjacent spherical bearings 38 are rotatably supported by a common “L” -shaped link 50. That is, the adjacent rotating shaft portions are supported by the common link. Each link 50 is swingably supported between two forked arm portions 56 a formed on the link post 56. The respective arm portions 56a are fixed to the case 62, respectively. As shown in FIG. 3, safety gears (gears) 64 are provided on the upper and lower rotary shafts 32a and 32b of each roller support member 32, respectively. Each safety gear 64 has an arm portion 56 of the link post 56.
They are provided in the space formed by the space a, the link 50, and the case 62, respectively. The safety gear 64 of the upper rotary shaft portion 32a of one roller support member 32 and the safety gear 64 of the lower rotary shaft portion 32b of the other roller support member 32 mesh with each other. As a result, all the roller support members 32
The rotational movements of can be synchronized. Each roller support member 32 has an extension shaft portion 32c provided concentrically with each rotation shaft portion 32b. It should be noted that each extension shaft portion 32c is configured to rotate integrally with each rotation shaft portion 32b. Pistons 76 are provided on the outer circumferences of the respective extension shaft portions 32c. Each piston 76 has a piston insertion hole 84 formed in the control valve body 82.
Have been inserted in each. Oil chambers are formed above and below the piston 76 of the piston insertion holes 84, respectively, and the pistons 76 can be moved up and down by the hydraulic pressure acting on the oil chambers. The piston 76 and the piston insertion hole 84 form a hydraulic cylinder device. In FIG. 1, a spherical bearing 38 provided on the rotary shaft portion 32b of the roller support member 32 arranged on the left side in the figure.
And the piston 76 and the piston insertion hole 84 of the hydraulic cylinder device, and the spherical bearings 38 and the piston 76 and the piston of the hydraulic cylinder device, which are provided on the rotary shaft portions 32a and 32b of the roller support member 32 arranged on the lower side in the figure, respectively. Although illustration is omitted, the insertion hole 84 is similar to that arranged on the right side in the drawing.

Next, the operation of the above embodiment will be described. By controlling the hydraulic pressures of the oil chambers above and below the piston 76, the pistons 76 move up and down. As a result, the direction of the tangential force acting on the friction roller 24 changes, so that each roller support member 32 rotates about the rotation shaft portions 32a and 32b. Rotating shaft portion 32a on the upper side of one roller support member 32 adjacent to each other
The safety gear 64 of the other roller support member 32 and the safety gear 64 of the lower rotary shaft portion 32b of the other roller support member 32 are meshed with each other.
The rotational movement between the two is synchronized. That is, all the roller support members 32 synchronously rotate. Therefore, it is possible to prevent the friction roller 24 from slipping due to the deviation of the rotational movement between the roller support members 32.

[0008]

According to the first aspect of the present invention, gears are provided on the rotary shafts of the roller support members respectively supporting the plurality of friction rollers, and the gears of the adjacent rotary shafts are meshed with each other. As a result, the rotational movements of all the roller supporting members can be synchronized, so that the friction rollers can be prevented from slipping. Further, according to the present invention as set forth in claim 2, between adjacent rotating shaft portions are rotatably supported by "L" -shaped links, and the links are formed between the bifurcated arm portions formed on the link posts. All the arm parts are fixed to the case, and the gears are arranged in the space surrounded by the link, the arm parts of the link post, and the case. This allows
Since the adjacent roller supporting members can be directly connected to each other by a gear, the number of parts is reduced, and thereby the assembling property and the operability are improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view perpendicular to an axis of a friction wheel type continuously variable transmission according to the present invention.

FIG. 2 is an axial sectional view of a link post portion.

FIG. 3 is a sketch of a safety gear.

[Explanation of symbols]

 10 Input Disc 12 Output Disc 24 Friction Roller 29 Eccentric Shaft 32 Roller Support Members 32a, 32b Rotating Shaft 64 Safety Gear

Claims (2)

[Claims] 1. An input disc (10), an output disc (12), and a plurality of friction rollers (24) arranged in frictional contact with both discs in a toroidal groove formed by both discs. , Each of the friction rollers (24) is rotatably supported via an eccentric shaft (29), and is rotatable about the respective rotary shaft portions (32a, 32b) orthogonal to the shaft centers of both discs and the above-mentioned rotation. The roller support member (32) movable in the axial direction of the shaft portions (32a, 32b) and the respective roller support members (32) are attached to the rotary shaft portion (32
a, 32b) and a hydraulic cylinder device that can be driven in the axial direction, respectively, and a gear (64) is provided on each of the rotary shaft portions (32a, 32b). , Each gear (64) has an adjacent rotating shaft (32a, 32).
The friction wheel type continuously variable transmission characterized in that the gears of b) are meshed with each other. 2. The adjacent rotating shaft portions (32a, 32a)
b) are rotatably supported by links (50) each having a substantially “L” shape, and each link (50) is a bifurcated arm portion formed on a link post (56). Each arm portion (56a) is fixed to the case (62), and the gear (64) includes the link (50) and the arm portion (56a). 5
The friction wheel type continuously variable transmission according to claim 1, wherein the friction wheel type continuously variable transmission is arranged in a space surrounded by a space (6a) and a case (62).