JPH0596597U - Continuously variable transmission for automobiles - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to provide a centrifugal balance chamber for canceling a centrifugal force acting on a driven pulley in a pulley groove width adjusting mechanism in a continuously variable transmission using a belt transmission mechanism. It is to obtain a structure that can be provided and can easily supply oil to the centrifugal balance chamber. The present invention is characterized in that oil is supplied to a centrifugal balance chamber 8D arranged on the back surface of a movable flange 8 by a nozzle 10A formed on the housing 10 side.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a continuously variable transmission for an automobile, and more particularly, to a structure of a groove width control mechanism for a belt-engaging pulley in a belt transmission mechanism.

[0002]

[Prior Art]

 As is well known, in continuously variable transmissions for automobiles, the rotational force from the torque converter is used as the drive side, and the drive side pulley provided on this drive side and the driven side provided in parallel with this pulley. An endless belt is hung on the side pulley and the groove width of the pulley is changed to change the belt winding radius to change the rotational speed of the driven side relative to the rotational speed of the drive side. There is a structure. In such a continuously variable transmission, the hydraulic pressure controlled by a regulator valve that regulates the oil discharged from the oil pump, so-called line pressure, is supplied to the hydraulic chamber of the driven pulley, so that the belt The clamping force (clamping force) is obtained. However, as the pulley rotates, centrifugal force is generated in the oil filled in the hydraulic chamber, and the line pressure above the preset line pressure is applied to the driven pulley side, which causes an excessive clamping force on the belt. There was a problem that it would end up.

Therefore, as a means for solving such a problem, there has been proposed a structure in which a centrifugal balance chamber is formed on the back surface of the hydraulic chamber, and the centrifugal force is offset by filling the chamber with oil ( For example, Japanese Patent Publication No. 63-29142).

[0004]

[Problems to be solved by the device]

 The oil is generally supplied to the centrifugal balance chamber from the hydraulic chamber of the driven pulley through an orifice.In this structure, the orifice diameter is set too large to prevent the line pressure from escaping from the orifice. Can not. Therefore, if dust or the like is mixed in the oil, the dust may clog the holes of the orifice, which may cause a problem that the oil cannot be supplied to the balance chamber side. In order to avoid this, it is possible to supply oil from the oil passage formed in the driven shaft as in the case of supplying oil to the hydraulic chamber of the driven pulley. A new problem arises that the road structure becomes complicated.

Therefore, an object of the present invention is to provide a structure capable of easily supplying oil to a centrifugal balance chamber provided in a driven pulley.

[0006]

[Means for Solving the Problems]

 In order to achieve this object, the present invention provides a pulley composed of a fixed flange provided on a drive shaft and a driven shaft and a driven flange slidable in the axial direction with respect to the fixed flange, and between the pulleys. In a continuously variable transmission for an automobile, which comprises an endless belt stretched over, a fixed wall fixed to the driven shaft side, a first oil chamber formed by the fixed wall and a back surface of the driven flange, and Formed by a movable wall fixed to the tip of a cylinder portion extending in the axial direction from the circumferential end of the driven flange and having a radial gap with respect to the fixed wall, the movable wall and the fixed wall. A second oil chamber, and an oil supply mechanism including a nozzle that extends from an oil passage formed in a housing located near the movable wall and opens toward a gap between the movable wall and the fixed wall. It is characterized by having There.

[0007]

[Action]

 According to the present invention, the extension portion from the oil passage formed in the housing located near the movable wall has a nozzle opened to the radial gap between the movable wall and the fixed wall. An oil supply mechanism is provided, and the oil is smoothly supplied from this nozzle to the centrifugal balance chamber located between the both walls without impairing the centrifugal balance function.

[0008]

【Example】

 1 and 2, the details of the embodiment of the present invention will be described below. FIG. 1 is a sectional view showing the configuration of the main part of a continuously variable transmission for an automobile according to an embodiment of the present invention. In the figure, in a continuously variable transmission 1 for an automobile, an output from a torque converter 2 is used as a driving side, and a shaft 3 on the driving side serves as a driving side for a forward / reverse switching mechanism 4 and a continuously variable transmission mechanism 5. A drive pulley 6 is provided.

On the other hand, a driven shaft 7 is provided in the vicinity of the shaft 3 in parallel with the shaft 3, and the driven pulley 8 forming the driven side of the continuously variable transmission mechanism 5 is provided on the shaft 7. And the reduction gear 9 is supported. The reduction gear 9 is arranged between the crank shaft and a gear in a differential box (not shown) and meshes with the first stage of the plurality of gears. The groove width of the pulley 8 on the driven shaft 7 is controlled by the structure described later. That is, as shown in FIG. 2, the groove width control structure includes a fixed flange 8A forming one side of the pulley 8, a driven flange 8B facing the fixed flange 8A, a first oil chamber 8C and a second oil chamber. 8D and refueling mechanism 10. The above-mentioned fixed flange 8A is formed integrally with the driven shaft 7, and the driven flange 8B is formed over a part of the boss portion of the fixed flange 8A and the shaft 7. A certain sleeve 8B1 is provided so that it can slide on the shaft 7 in the axial direction via the sleeve 8B1. The driven flange 8B is prevented from rotating with respect to the shaft 7 by a ball spline 7A.

On the other hand, the first oil chamber 8C is composed of a rear surface of the driven flange 8B and a first fixed wall 8B2 fixed to the shaft 7 so as to face the rear surface. The first fixed wall 8B2 described above has a stepped cup shape in cross section as shown in the figure, and the surface corresponding to the bottom is inserted into the stepped portion of the shaft 7, and this surface is located, for example, in the vicinity. The inner ring of the bearing 11 fixed to the shaft 7 is used to prevent axial movement by the nut 12 and the like. The cylinder is provided between the fixed wall 8B2 and the rear surface of the driven flange 8B. By making it a chamber, the first oil chamber 8C is configured.

Further, the second oil chamber 8D is located behind the first oil chamber 8C and is composed of a second fixed wall 8D 1 and a movable wall 8D2. That is, the second fixed wall 8D1 has an L-shaped cross section as shown in the drawing, and the surface of the second fixed wall 8D1 that is bent and parallel to the axial direction is located on the first oil chamber 8C side. It is fixed to the fixed wall 8B2 so as to be prevented from moving in the axial direction, and when the bent portion is one end in the radial direction, the other end in the radial direction is constituted by the driven flange 8B. It is brought into contact with the inner peripheral surface of the extension portion of the cylinder chamber. Further, the movable wall 8D2 has a center portion inserted and fitted to the outer peripheral surface of the first fixed wall 8B2, and the outer peripheral surface is fixed to the tip of the extension portion from the driven flange 8B. The space between the second fixed wall 8D1 and the second fixed wall 8D1 serves as a second oil chamber 8D.

As described above, the movable wall 8D2 has an opening edge portion inserted into the outer periphery of the first fixed wall 8B2 so that the movable wall 8D2 can slide in the axial direction in conjunction with the driven flange 8B. It is separated from the outer peripheral surface of the first fixed wall 8B2. The second oil chamber 8D has a function of suppressing unnecessary axial force generated in the driven flange 8B when the shaft 7 is rotating and keeping the groove width in a predetermined state. That is, when the shaft 7 is rotating, the oil filled in the first oil chamber C generates an axial component force by the centrifugal force generated by the rotation of the shaft 7, and the component force is generated. Acting on the driven flange 8B, an axial force is applied to the driven flange 8B, and as a result, the driven flange 8B is moved in a direction in which the preset groove width is changed. Therefore, in this embodiment, the movable wall 8D2 in the second oil chamber 8D is integrated with the driven flange 8B, and the second fixed wall 8D1 is provided at a position facing the movable wall 8D2, and then the oil is filled. Then, by utilizing the axial component force due to the centrifugal force generated in the oil in the second oil chamber 8D, the force is balanced in the direction opposite to the direction in which the driven flange 8B moves on the movable wall 8D2. It is designed to prevent unnecessary movement of the driven flange 8B.

It is necessary to constantly fill the second oil chamber 8D with oil, but in the present embodiment, an oil supply mechanism for this purpose does not utilize the oil passage in the shaft 7. Has been adopted. That is, in FIG. 2, the oil supply mechanism 10 extends, for example, a lubrication oil passage 13 to a belt, a bearing, a gear and the like provided at a position close to the driven side shaft 7, and the end thereof is a transmission case. And the nozzle 10A is formed. The nozzle 10A is set such that its direction is toward the free gap between the movable wall 8D2 and the outer peripheral surface of the first fixed wall 8B2, and the oil passing through the lubricating oil passage 13 is indicated by a broken line. Thus, the fuel is injected toward the free space.

Since the present embodiment has the above-described structure, the centrifugal force acting on the first oil chamber 8C is canceled by the oil filled in the second oil chamber 8D which is the centrifugal balance chamber. Thus, it is possible to prevent the movable flange 8B from being unnecessarily moved. Moreover, since the oil to the second oil chamber 8D is supplied from the nozzle 10A formed in the housing, there is no fear of clogging of dust as in the conventional case, and a complicated hydraulic circuit is not formed. With the extremely simple hydraulic pressure supply structure, the centrifugal balance function described above can be exerted.

[0015]

[Effect of the device]

 As described above, according to the present invention, the centrifugal force acting on the first oil chamber when the shaft is rotated is offset by the oil filled in the second oil chamber which is the centrifugal balance chamber. Since the movable flange can be prevented from being unnecessarily moved and the displacement of the driven flange can be suppressed, the clamping force of the belt can be maintained in an appropriate state. Moreover, since the oil is supplied to the second oil chamber from the nozzle formed on the housing side, compared with the conventional one in which the oil is supplied from the oil chamber of the driven pulley, An oil supply structure having a simple structure can be obtained without requiring a complicated structure such as formation of an oil passage in the shaft and further without causing a problem such as clogging of dust.

[Brief description of drawings]

FIG. 1 is a cross-sectional view illustrating an overall configuration of a continuously variable transmission for a vehicle according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view showing a main part of the transmission shown in FIG.

[Explanation of symbols]

 1 Continuously Variable Transmission for Vehicle 6 Pulley on Drive Side 8 Pulley on Driven Side 8A Fixed Flange 8B Driven Flange 8B1 Sleeve 8B2 First Fixed Wall 8C First Oil Chamber 8D Second Oil Chamber 8D1 Second fixed wall 8D2 Movable wall 11 Oil supply mechanism 11A Nozzle 13 Extension path of lubricating oil path

Claims (1)

[Scope of utility model registration request] 1. A pulley composed of a fixed flange and a driven flange, which are respectively disposed on a drive shaft and a driven shaft, and axially slidable with respect to the fixed flange, and an endless belt wound between the pulleys. And a first oil chamber formed by the fixed wall and the back surface of the driven flange, and a circumferential end of the driven flange. A movable wall fixed to the tip of a cylinder portion axially extending from the movable wall and having a radial gap with respect to the fixed wall; and a second oil chamber formed by the movable wall and the fixed wall. An automobile provided with an oil supply mechanism including a nozzle extended from an oil passage formed in a housing located near the movable wall and opening toward a gap between the movable wall and the fixed wall. Continuously variable transmission for