JPH02309045A - Friction type continuously variable transmission - Google Patents

Abstract

PURPOSE:To facilitate fitting and removal of a taper cone to/from a supporting case and construct the bearing part in small and simple structure by forming a notched open part, which admits slipping-out of the taper cone shank part from the bearing part through its movement in the radial direction. CONSTITUTION:The procedure for installing a taper cone 2 to a supporting case 6 is initiated with fitting of a follower gear 12, on which a cylinder 17 and a bearing 13 are fitted, on the major dia. cone shank 11 of the taper cone 2 in its specified position. Then the minor dia. cone shank 9 is fitted in a bear ing 15 through a notched open part 16, and the major dia. cone shank 11 with the follower gear 12 fitted is moved aslant, and the cogged part 12a of this follower gear 12 is put in the condition as inserted in the inner bearing part 32 of the supporting case 6. The bearing 13 is moved parallelly in the axial direction until it intrudes into the specified position of this inner bearing part 32, and a flange 14 provided with a bearing metal 10 is fitted in the bearing part 15 in such a condition that the minor dia. cone shank 9 is fitted in, that shall be followed by fastening with a bolt or bolts.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention provides a plurality of tapered cones around an input shaft that are driven and rotated by the input shaft, and a driven rotary body for output to these tapered cones. The present invention relates to a friction type continuously variable transmission in which a friction type continuously variable transmission is externally or internally connected so as to be shiftable in the axial direction.

[Conventional technology]

The above-mentioned friction-type continuously variable transmission device, as shown in Japanese Patent Application No. 63-325474 previously filed by the present applicant, has a tapered cone connected to the shaft portion on the small diameter side and the shaft portion on the large diameter side of the taper cone portion. A cylindrical bearing case is rotatably supported by two bearings on the shaft, and a cylindrical bearing case supporting the smaller diameter shaft is provided so as to be insertable into and removable from the support case supporting the tapered cone. It has been proposed that the tapered cone is set to be larger than the maximum diameter of the tapered cone so that the tapered cone can be attached to and removed from the support case through an opening through which the bearing case is removed.

[Problem to be solved by the invention]

According to the prior art, a large bearing case is detachably provided in order to attach and detach the tapered cone to and from the support case, so the structure becomes large and complex, resulting in relatively high costs. The tapered cone was thick in the axial direction (it was also troublesome to move it and remove it).

Additionally, there is a risk of oil leakage from the joint between the bearing case and the support case.

An object of the present invention is to solve the above-mentioned problems.

[Means to solve the problem]

In order to achieve the above object, the present invention provides the friction type continuously variable transmission described at the beginning, in which the tapered cone is freely rotatable by two bearing parts, a small diameter shaft part and a large diameter shaft part of the taper cone part. and a notch opening is formed in one of the bearing parts to allow the shaft part of the tapered cone attached to the bearing part to come out of the bearing part by moving in the radial direction. Features.

[For production]

In other words, in order to assemble the tapered cone to the support case, insert the shaft on one side into the bearing through the open cutout, and then insert the shaft on the other side into the bearing that does not have the open cutout. By slightly translating the taper cone in the axial direction, both shaft portions of the tapered cone can be attached to respective bearing portions formed in the support case.

When removing the tapered cone from the support case, the operation can be performed in the reverse order as described above.

In other words, (a) there is no need to shift the taper cone over its entire axial length as in the past (and it also requires a large bearing separate from the support case that allows the maximum diameter of the taper cone to pass through). There is no need to interpose a case, and (b) the joint between the support case and the bearing case can also be eliminated.

〔Effect of the invention〕

Therefore, the effect of (a) makes it easier to attach and detach the tapered cone to the support case, and also makes it possible to make the structure of the bearing part smaller and simpler, thereby reducing costs. became.

Furthermore, due to the effect of (I), there was no fear of oil leakage, and the quality of the friction type continuously variable transmission device could be improved.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

In Figure 1, three tapered cones (2), which are driven and rotated by the input shaft (1), are arranged at equal intervals around an input shaft (1), and these tapered cones (2) are driven by a driven drive for output. A driven ring (3) as a rotating body is circumscribed so as to be shiftable in the direction of its rotation axis, and the driven ring (3)
A friction type continuously variable transmission is shown in which an output shaft (4) for decelerating and taking out the rotation by a planetary reduction mechanism (A) is provided coaxially with the input shaft (1).

The casing (C) of this friction-type continuously variable transmission is a human-powered case (5) that supports the input side of the input shaft (1) with a bearing.
), a support case (6) that interposes the pump (B) and supports the taper cone (2) with the input case (5), and a support case (6) that connects the support case (6) and covers most of the device. It consists of a mission case (7) and a lid case (8).

The tapered cone (2) has a cone shaft (9) on the small diameter side of the cone with a bearing metal (10), and a cone shaft (11) on the large diameter side of the cone with a passive gear (12) that is spline-fitted onto the cone shaft (11). ) is rotatably supported by a support case (6) by a bearing (13). The bearing metal (10) is attached to the support case (6) via the flange member (14), and as shown in FIG. The tapered cone (2) can be fixed to the bearing part (15) of the support case (6) that supports the cone shaft (9) on the small diameter side. A notch opening portion (16) is formed that allows the input shaft to come out of the bearing portion (15) by moving in the radial direction of the input shaft (1) and in the outer radial direction with respect to the input shaft (1).

Therefore, the procedure for assembling the tapered cone (2) to the support case (6) is as follows.

First, the cone shaft (11) on the large diameter side of the taper cone (2)
), a passive gear (12) having a cylindrical body (17) and a bearing (13), which will be described later, fitted externally, is externally fitted in a predetermined position.

Next, cut the cone shaft (9) on the small diameter side into the open part (16).
The large diameter cone shaft (11) with the passive gear (12) attached thereto is moved diagonally so that the gear part (12a) of the passive gear (12) is inserted into the bearing part (15) through the support case (6). inside the inner bearing part (32). Then, the bearing (13) is connected to the inner bearing portion (3).
2), that is, after moving the tapered cone (2) in parallel in its axial direction by approximately the width of the bearing (13), the flange member (14) provided with the bearing metal (lO) is moved. The cone shaft (9) on the smaller diameter side is fitted into the bearing part (15) and bolted.

If you want to remove it, you can do it by performing the above steps in reverse.

A bearing (13) is attached to the cylindrical shaft portion of the passive gear (12).
) is fitted with an adjacent cylindrical body (17) via a washer, and by closely fitting the outer periphery of this cylindrical body (17) into the inner peripheral surface of the taper cone (2), the taper cone (2) Inside the cylinder (17) and the passive gear (12)
A hydraulic chamber (18) is formed which is partitioned by. The taper cone (2) is connected to this hydraulic chamber (18).
), the bearing metal (10), the flange member (14), and the oil passage (1) formed inside each of the support case wall (6a).
9), so that the pressure oil of the pump (B) is force-fed, that is, the taper cone (2) is hydraulically pressed toward its smaller diameter side. In addition, (31) is the oil passage (
This is an ejection hole for ejecting the pressure oil (19) onto the surface of the taper cone (2) for cooling.

As shown in FIGS. 1 and 2, the pump (B) is an internal gear type pump, and includes an internal gear body (20) which is connected to an input shaft (1) and driven to rotate, and this internal gear body. (20)
A space surrounded by a support case (6) and a partition member (22) sandwiched between the support case (6) and the input case (5). and a discharge port (23) communicating with all three oil passages (19) provided radially in the support case (6), and a discharge port (23) for guiding the lubricating oil in the casing (C). A suction port (25) communicating with a suction oil passage (24) formed in the support case (6) is disposed opposite to each other on the left and right sides of the pump (B).

In addition, a switching valve (D) is provided in each of the three radial oil passages (19) provided in the support case (6).
By integrally switching these switching valves (D), the pressure oil from the pump CB) is returned to the casing (C), so the pressing action of the taper cone (2) is no longer generated, and the driven ring Power is no longer transmitted from (3) to the output shaft (4).

In other words, by switching the switching valve (D), the output shaft (4)
The function of the clutch is to intermittent the power of the engine.

As shown in FIG. 1, the taper cone (2) is rotationally driven by the engagement of the passive gear (12) and the drive gear (40) fitted externally with splines on the input shaft (1), and the planetary reduction mechanism (A A driven ring (3) circumscribing the tapered cone (2) is supported on the slide pin (27) fixed to the ring gear (26) in ), and this driven ring (3) is connected to the shaft of the slide pin (27). the ring gear (26) by shifting with the shift member (28) in the direction
) can be changed steplessly. A sun gear (29) is spline-fitted onto the input shaft (1), and a flanged cylindrical output shaft ( 4) is supported by a bearing on the lid case (8).

The ring gear (26) is supported by a bearing on the sun gear (29), and the non-input side of the input shaft (1) is supported by a bearing on the lid case (8) via the output shaft (4). It is.

In addition, the opening (7a) of the mission case (7) which becomes the joint with the lid case (8) is connected to the support case (6) with the taper cone (2) including the flange member (14) pre-assembled. It is sized so that it can pass through.

Next, to explain the power transmission function of this friction type continuously variable transmission, when the input shaft (1) is driven by an engine etc., the taper cone (2) and sun gear (29) rotate, and the pump (B) rotates. is also driven, thereby pushing the taper cone (2) toward its smaller diameter side, and the circumscribing ring gear (26) begins to rotate due to contact friction, and this rotation is output via the planetary reduction mechanism (A). Axis (4)
This is what I tell them.

[Another example]

The present invention may be applied to a friction type continuously variable transmission in which the driven rotating body (3) is inscribed in the tapered cone (2).

Further, the notch opening portion (16) may be provided in the inner bearing portion (32).

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of drawings]

The drawings show an embodiment of a friction-type continuously variable transmission according to the present invention, with FIG. 1 being an overall cross-sectional side view and FIG. 2 being a cross-sectional front view. (1)... Input shaft, (2)... Taper cone, (3)... Driven rotating body, (15),
(32)...Bearing part, (16)...
Notch opening.

Claims (1)

[Claims] A plurality of tapered cones (2) that are driven and rotated by the input shaft (1) are arranged around the input shaft (1), and a driven rotating body (3) for output is connected to these tapered cones (2) in the axial direction. This is a friction type continuously variable transmission device which is externally or internally connected so as to be shiftable, and the tapered cone (2) is connected to two bearing portions (15 ), (32), and the shaft portion of the tapered cone (2) attached to one of the bearing portions (15 or 32) moves in the radial direction to rotate the shaft portion of the tapered cone (2). 15 or 32).