JPH02309043A - Friction type continuous variable transmission - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention includes a plurality of speed change drive rotors that are driven and rotated by the input shaft around an input shaft, and these drive rotors are provided with an output drive rotor. The present invention relates to a friction type continuously variable transmission in which a driven rotating body is brought into contact with the driven rotating body so as to be shiftable in its axial direction, and the driving rotating body is pressed toward the driven rotating body by a hydraulic mechanism.

[Conventional technology]

Conventionally, the bearings that pivotally support the driving rotary body in the friction type continuously variable transmission are configured to be lubricated by mission oil that is stirred by gears or the like and scattered within the casing of the transmission. The one shown in Japanese Utility Model Application Publication No. 56-131052 is known.

[Problem to be solved by the invention]

A driving rotary body in a friction type continuously variable transmission is pressed in its axial direction by a hydraulic mechanism in order to generate a contact force for transmitting power to a driven rotary body. In other words,
The bearing of the drive rotor must withstand not only rotation but also the thrust load due to the above-mentioned pressure, but the lubrication of the bearing, which should function under such severe conditions, is lost due to accidental splashing of mission oil. Since the bearings were left to the natural phenomena, not only did the durability of the bearings tend to vary depending on the product, but also the lubrication performance tended to vary depending on the conditions of use.

In addition, to ensure sufficient durability even if the durability varies toward the inferior side, we set the grade of wear resistance to a higher grade, although it would be disadvantageous in terms of cost. .

The present invention focuses on the fact that the means for pressing the driving rotating body is a hydraulic mechanism, and by actively lubricating the bearing that supports the driving rotating body, it is possible to stably lubricate the bearing. The purpose is to

[Means to solve the problem]

Therefore, the present invention provides the friction type continuously variable transmission described at the beginning, in which a hydraulic chamber in the hydraulic mechanism is formed inside the drive rotary body, a small path for taking out pressure oil communicating with this hydraulic chamber is provided, and the small diameter The present invention is characterized in that the pressure oil flowing out from the passage reaches a bearing that pivotally supports the driving rotary body.

[For production]

That is, since pressure oil is always delivered to the hydraulic chamber while the friction type continuously variable transmission is being driven, lubricating oil is always supplied to the bearings that pivotally support the drive rotary body. In other words, since it is possible to actively lubricate the bearing, it is possible to eliminate the fear that the amount of lubricating oil sprinkled on the bearing differs depending on the product, which has been the case in the past.

In addition, the pressure oil in the hydraulic chamber is discharged into the casing through a small path and circulates, so the pressure oil sent to this hydraulic chamber causes the generation of electricity due to contact between the driving rotor and the driven rotor. It is also possible to absorb the heat generated by

〔Effect of the invention〕

Therefore, a sufficient amount of lubricating oil can be supplied to the bearing that pivotally supports the driving rotor, and the bearing can be stabilized, so that its durability can be improved and stabilized.

Furthermore, since the grade of the bearing can be set to suit the needs, there will be no economic disadvantage.

Furthermore, since the driving rotor can be cooled by the circulating pressure oil in the hydraulic chamber, the durability against wear caused by contact with the driven rotor can be improved.

As a result, the originally provided hydraulic means could be effectively utilized, making it possible to achieve the desired objective while being economically advantageous compared to means that are equipped with a dedicated lubrication device.

〔Example〕

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

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

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

The tapered cone (2) has a plain bearing (10) for the cone shaft (9) on the small diameter side of the cone, and a passive gear (12) that externally fits the cone shaft (11) on the large diameter side onto this cone shaft (11) by a spline. ) through ball bearings (
13) is rotatably supported by the support case (6). The plain bearing (10) is a flange member (
14) to the support case (6), but the second
As shown in the figure, the flange part of the flange member (14) is connected to the support case (6) with bolts in the cone axis direction, and the support case (6) supports the small diameter cone shaft (9). The part (15) is the small diameter side cone shaft (9)
By moving this shaft (9) in the radial direction, this bearing part (
15) Notch opening part (16) that allows extraction from the
has been formed.

A hydraulic piston (17) adjacent to the inner ring of a ball bearing (13) via a washer is fitted onto the cylindrical shaft portion of the passive gear (12), and the outer periphery of this piston (I7) is fitted with a tapered cone ( 2) The piston (1) is fitted inside the taper cone (2) by tightly fitting it into the inner peripheral surface.
7) and a passive gear (12) to form a hydraulic chamber (18) partitioned by the hydraulic mechanism (D). Then, the taper cone (2) is connected to this hydraulic chamber (18).
, plain bearing (10), flange member (14)
, so as to forcefully send the pressure oil of the pump (B) through the oil passages (19) formed inside each of the support case walls (6a), that is, to press the taper cone (2) toward its small diameter side by hydraulic pressure. It is configured.

As shown in FIG. 1, the piston (17) in the hydraulic mechanism (D) communicates with a hydraulic chamber (18) formed inside the taper cone (2), and also has a ball bearing (13) adjacent to the piston (17). A small through hole (31) is formed as a small path for taking out pressure oil toward the ball part of
The ball bearing (13) is lubricated by pressure oil jetted out from the small hole (31).

Also, the plain bearing (10) also has its oil path (I9)
By forming this, the pressure oil from the pump (B) can penetrate into the sliding surface portion.

Note that (32) is a spring for preloading the taper cone (2) toward the smaller diameter side.

As shown in FIG. 12, the pump (B) is an internal gear type pump, and includes an internal gear body (20) connected to an input shaft (1) by a key and driven to rotate, and this internal gear body (20). ) is surrounded by a support case (6) and a partition member (22) held between the support case (6) and the input case (5). In order to guide the lubricating oil in the casing (C) and the discharge port (23) which is arranged in the space and communicates with all three oil passages (19) provided radially in the support case (6). A suction port (25) communicating with a suction oil passage (24) formed in the support case (6) is disposed on the left and right sides of the pump (B) so as to face each other.

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) also rotates. As the cone is driven, the taper cone (2) is pressed toward its smaller diameter side, and the circumscribing ring gear (26) begins to rotate due to contact friction.
This rotation is transmitted to the output shaft (4) via the planetary reduction mechanism (A).

[Another example]

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

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 the drawing]

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)... Drive rotating body, (3)... Driven rotating body, (13)...
... Bearing, (18) ... Hydraulic chamber.

Claims (1)

[Claims] Around the input shaft (1), a plurality of speed change drive rotors (2) driven and rotated by the input shaft (1) are arranged, and these drive rotors (2) are connected to output driven rotors (3). ) are in contact with each other so as to be able to shift in the axial direction, and the driving rotary body (2) is brought into contact with the driven rotary body (3) by a hydraulic mechanism (D).
) side, the hydraulic chamber (18) of the hydraulic mechanism (D) is formed inside the drive rotary body (2), and the hydraulic chamber (18) is A communicating small path (31) for taking out pressure oil is provided, and this small path (31) is provided.
A friction type continuously variable transmission device configured such that pressure oil flowing out from the drive rotary body (2) reaches a bearing (13) that pivotally supports the drive rotary body (2).