JPS62288764A - Hydraulic passage structure for operating pulley of continuously variable transmission - Google Patents

Abstract

PURPOSE:To obtain the simple structure and improve workability by feeding and discharging the oil pressure into a cylinder chamber through the hydraulic passage of a transmission case, bearing supporting part hydraulic passage, and a communication hydraulic passage, thus shortening the hydraulic passage and improving responsiveness. CONSTITUTION:A hydraulic passage 24 is formed at a part of the bearing supporting part 22 of an input shaft 11, and one edge of the bearing supporting part hydraulic passage 24 is allowed to communicate to a case hydraulic passages 26 formed onto a case 5, and the other edge of the bearing supporting part hydraulic passage 24 is allowed to communicate to a cylinder chamber 12c through a communication hydraulic passage 28. The oil pressure supplied from an oil source is supplied and discharged from the cylinder chamber 12c through the case hydraulic passage 6, bearing supporting part hydraulic passage 24, and the communication hydraulic passage 28, and a movable pulley 12b is shifted for a fixed pulley 12a. Since the oil hydraulic passage is formed on the axis center of the input shaft 11, responsiveness can be improved by shortening the hydraulic passage, and the simple structure can be obtained, and the workability in working can be improved.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention "Field of Industrial Application" The present invention relates to a hydraulic passage structure for operating a pulley of a continuously variable transmission.

``Prior Art'' In a continuously variable transmission in which a driving pulley and a driven pulley are connected by a driving belt, each pulley consists of a fixed pulley fixed to a rotating shaft and a rotating pulley movable in the axial direction of the rotating shaft. It consists of a movable pulley that is loosely fitted on a shaft, and a ■-shaped belt is held in a ■-shaped groove formed by the fixed pulley and the movable pulley. Then, the movable pulley is moved relative to the fixed pulley using hydraulic pressure to adjust the interval between both pulleys, that is, the interval between the ■-shaped grooves, thereby changing the rotation ratio between the driving pulley and the driven pulley. It looks like this.

As such a conventional continuously variable transmission, for example, the
7-159053, a cylinder chamber is arranged adjacent to the movable pulley, and the cylinder chamber communicates with an oil source via a hydraulic passage formed in the axis of the rotating shaft. Therefore, hydraulic pressure from the oil source is supplied to and discharged from the cylinder chamber through the hydraulic passage at the axis of the rotary shaft, thereby causing the movable pulley to move relative to the fixed pulley.

"Problems to be Solved by the Invention" In the conventional transmission described above, since the hydraulic passage is formed at the axis of the rotating shaft, the hydraulic passage becomes long and the response becomes poor. Furthermore, the structure becomes complicated and the workability of processing is poor.

The purpose of this invention is to provide a hydraulic passage structure for the pulley operation of a continuously variable transmission, which can shorten the hydraulic passage and improve responsiveness, and also simplify the structure and improve machining workability. It is about providing.

"Means for Solving the Problems" The present invention includes a rotating shaft, a fixed pulley fixed to the rotating shaft, a movable pulley loosely fitted to the rotating shaft so as to be movable in the axial direction of the rotating shaft, and a For actuating a pulley of a continuously variable transmission, the device is equipped with a cylinder chamber arranged adjacent to a movable pulley for hydraulically moving the movable pulley relative to a fixed pulley, and a hydraulic passage for supplying and discharging hydraulic pressure to the cylinder chamber. In the hydraulic passage structure, the hydraulic passage includes a case hydraulic passage formed in the transmission case, and a bearing support hydraulic passage that communicates with the case hydraulic passage and is formed in a part of the support of the bearing of the rotating shaft. , a communicating hydraulic passage communicating the bearing support hydraulic passage and the cylinder chamber.

"Function" In the present invention, hydraulic pressure is supplied to the cylinder chamber via a hydraulic passage formed in the transmission case, a bearing support hydraulic passage formed in a part of the bearing support, and a communicating hydraulic passage. It is designed to be ejected. For this reason,
Since the hydraulic passage is not formed at the axis of the rotating shaft, the hydraulic passage can be shortened and responsiveness can be improved. Furthermore, the structure is simplified and the workability of processing is improved. Further, since the hydraulic pressure passes through the hydraulic passage formed in the bearing support portion, the bearing is reliably lubricated.

"Embodiments" Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

FIG. 1 shows a cross section of a continuously variable transmission according to an embodiment of the present invention, and FIG. 2 shows its main parts.

As shown in FIG. 1, a belt type continuously variable transmission 1 receives power from a prime mover (not shown) through a clutch 3 attached to the end of an output shaft 2, and a differential gear 4. The main components are a continuously variable transmission 10, a first output gear device 40, and a second output gear device 50, and these are arranged inside the case 5. ing.

The continuously variable transmission 10 includes a driving pulley 12 on a human power shaft 11 disposed concentrically with the clutch 3, and a driven pulley 1 on an output shaft 13 disposed parallel to the human power shaft 11.
4, an endless belt 15 is passed between the drive and driven pulleys 12 and 14, and both of the drive and driven pulleys 12 and 14 are pulleys with variable effective pitch diameters. That is,
The drive pulley 12 includes a fixed boo 'J12a integrally formed or fixed to the human power shaft 11 and the boo! The movable pulley 12b is configured to be slidable in the axial direction relative to J12a, and the belt 15 is held between the mutually opposing conical surfaces of both pulleys 12a and 12b.

Similarly, the driven pulley 14 also has a fixed boo IJ 14a integrally formed or fixed to the output shaft 13 and the boo J1
Movable boo that can slide in the axial direction relative to 4a!
It is composed of J14b and both boos! The belt 15 is sandwiched between the conical surfaces of J14a and J14b that face each other.

And the movable boo 1J12 on both pulleys 12.14
Hydraulic cylinder chambers 12C and 114C are located on the back of b and 14b, respectively.
is provided, and a movable boolean IJ 12 of the drive side pulley 12 is provided.
b approaches and moves away from the stationary pulley 12a due to the hydraulic pressure introduced into the hydraulic cylinder chamber 12C, thereby changing the clamping position (effective pitch diameter) of the belt 15, which causes the drive-side pulley 12 and the driven-side pulley 12 to change. The rotation between the pulley 14 and the pulley 14 is changed. At this time, also in the driven pulley 14, the movable booby IJ14b is moved by the hydraulic pressure introduced into the hydraulic cylinder chamber 14C and the spring 14d installed in the cylinder chamber 14C, and the belt 15 is always kept in the required tension state. It is designed to be retained.

Next, a hydraulic passage for supplying and discharging hydraulic pressure to and from the cylinder chamber 12C of the movable boob IJ 12b of the drive pulley 12 will be described with reference to FIG. 1.2.

One end 11a of the human power shaft 11 is supported by a bearing 20. The bearing 20 is supported by a support part 22, and a part of the bearing support part 22 includes a hydraulic passage 2.
4 is formed. One end of the bearing support hydraulic passage 24 communicates with a case hydraulic passage 26 formed in the case 5, and the other end of the bearing support hydraulic passage 24 communicates with the cylinder chamber 12 via a communication hydraulic passage 28.
It is connected to c. Note that numerals 30 and 32 indicate a seal ring. And the oil pressure from the oil source (not shown) is
Case hydraulic passage 26, bearing support hydraulic passage 24,
The movable pulley 12b is supplied to and discharged from the cylinder chamber 12c through the communication hydraulic passage 28, and the movable pulley 12b is fixed. J12a
It will be moved against.

In addition, in FIG. 1, the movable boo of the driven pulley 14!
The hydraulic passage for supplying and discharging hydraulic pressure to and from the cylinder chamber 14C of J14b is the same as the conventional structure. That is, the oil pressure is supplied to and discharged from the cylinder chamber 14C via a case oil pressure passage 34 formed in the case 5 and an output shaft oil pressure passage 36 formed at the axis of the output shaft 13.

"Effects of the Invention" As explained above, according to the present invention, the hydraulic passage is shortened, so that responsiveness can be improved. Furthermore,
Since the structure is simplified, the workability of processing is improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a continuously variable transmission according to an embodiment of the present invention, and 2rgJ is a sectional view of a main part of FIG. 1. 5... Case, 11... Input shaft, 12... Drive pulley, 12a...
...Fixed pulley, 12b... Movable pulley, 12C... Cylinder chamber, 13... Output shaft, 14... Driven side Pulley, 14a...
...Fixed pulley, 14b...Movable pulley, 14C...Cylinder chamber, 15...Belt, 20...Bearing, 22 ......Bearing support part, 24...
...Bearing support hydraulic passage, 26...
......Case hydraulic passage, 28......Communication hydraulic passage.

Claims (1)

[Scope of Claims] A rotating shaft, a fixed pulley fixed to the rotating shaft, a movable pulley loosely fitted to the rotating shaft so as to be movable in the axial direction of the rotating shaft, and a movable pulley disposed adjacent to the movable pulley. A hydraulic passage structure for operating a pulley of a continuously variable transmission, comprising: a cylinder chamber for hydraulically moving a fixed pulley relative to a fixed pulley; and a hydraulic passage for supplying and discharging hydraulic pressure to and from the cylinder chamber; a case hydraulic passage formed in the transmission case; a bearing support hydraulic passage communicating with the case hydraulic passage and formed in a part of the support of the bearing of the rotating shaft; and the bearing support hydraulic passage. A hydraulic passage structure for operating a pulley of a continuously variable transmission, comprising: a communicating hydraulic passage that communicates with the cylinder chamber;