JPH056247U - Variable speed pulley structure of continuously variable transmission - Google Patents

Abstract

(57) [Abstract] [Purpose] The objective is to reduce the initial wear of the bearing relative to the rotating shaft and reduce the initial bearing clearance. [Structure] The outer peripheral surface of a rotary shaft 1 on which a fixed pulley 2 is fixedly mounted is formed as a hard smooth surface, and a bearing 3
A movable pulley 4 is provided so as to be slidable and movable through, and the bearing 3 has a steel ring portion on the outer peripheral side,
A porous bronze layer is sintered on the inside, and a resin sliding layer impregnated with resin is formed on the inside, and the inner peripheral surface of this resin sliding layer is formed on a smooth surface that has been roller burnished. There is.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure of a speed change pulley of a continuously variable transmission, and more particularly, to improvement of a periphery of a movable pulley bearing.

[0002]

[Prior art and its problems]

 As shown in FIG. 1, the drive-side or driven-side speed change pulley P in the continuously variable transmission has a fixed pulley 2 fixed to the rotary shaft 1 and a rotary pulley 1 fixed on the rotary shaft 1 in a direction in which the fixed pulley 2 is moved toward and away from the fixed pulley 2. The movable pulley 4 is movable, and the V belt 5 is wound between the fixed pulley 2 and the movable pulley 4, and the movable pulley 4 slides to continuously change the speed.

In order to smooth the sliding of the movable pulley 4 with respect to the rotary shaft 1, the inventors of the present application improved the bearing 3, and a sectional view is shown in FIG. 2 and an essential part is enlarged in FIG. The bearing 3 having such a structure as shown in FIG. 3 has been devised, and such a bearing 3 has a steel ring portion 3a on the outer peripheral portion thereof which abuts on the inner peripheral surface of the movable pulley 4, and the inner portion thereof has a porous A quality bronze layer 3b is formed by sintering, and a resin having lubricity is impregnated inside the porous bronze layer 3b to form a resin sliding layer 3c. The resin to be formed is an organic substance such as a polyetherketone resin or a polyimide resin, which is used alone or in combination.

In the bearing 3 having such a structure, the inner peripheral surface of the resin sliding layer 3c on the inner peripheral side is cut and formed by cutting or broaching. According to such processing, the inner peripheral surface is formed. In addition, as shown in an enlarged view in FIG. 4, the lathe and broaching cuts remained, and the inner peripheral surface was microscopically uneven. When the bearing 3 having the inner peripheral surface having such unevenness is used, the inner peripheral surface of the bearing 3 comes into contact with the outer peripheral surface of the rotating shaft 1, and the contact surface is crushed beyond the yield strength of the resin material, so that the movable pulley However, there was a problem that the uneven surface of the contact surface was scraped away and worn away when 4 slightly rotated during gear shifting, etc., and the bearing gap widened, causing the movable pulley 4 to shake or fall.

[0005]

[Means for Solving the Problems]

 The present invention has been devised in view of the above-mentioned conventional problems, and it prevents the initial wear of the bearing, reduces the bearing gap, eliminates the runout of the movable pulley, and allows the movable pulley to slide smoothly. The purpose of the present invention is not to provide a structure of a fixed pulley fixed to the rotating shaft, and a sliding movement on the rotating shaft in a direction of being fitted around the rotating shaft and moving toward and away from the fixed pulley. In a speed change pulley of a continuously variable transmission, the outer peripheral surface of the rotating shaft is formed as a hard smooth surface, and the outer peripheral surface of the rotating shaft and the inner peripheral surface of the movable pulley are formed. A bearing is interposed therebetween, and the bearing has an outer peripheral portion that abuts the inner peripheral surface of the movable pulley formed of a steel ring portion, and a sintered porous bronze is formed inside the steel ring portion. Layers are formed and further said rotation Of the inner periphery in sliding contact with the outer peripheral surface made form the resin sliding layer due to the resin impregnation, the inner peripheral surface of the resin sliding layer is to be formed on the smooth surface that is machined roller burnishing.

[0006]

[Action]

 Since the inner surface of the resin sliding layer formed by impregnating the resin on the inner peripheral side of the bearing is smoothed by roller burnishing, it makes sliding contact with the rotating shaft without any gap, and the sliding movement of the movable pulley Even when there is no wear, the bearing clearance can be reduced and the swing and tilt of the movable pulley can be reduced.

[0007]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. In this example, the inner peripheral surface of the bearing 3 described above is first formed by cutting by lathe processing or broaching as shown in the sectional view of FIG. 4, and then roller burnishing processing is added to this inner peripheral surface. Thus, as shown in FIG. 5, the inner peripheral surface of the resin sliding layer 3c is formed into a smooth sliding surface S. That is, in the roller burnishing process, a roller finished with high accuracy is brought into contact with the inner peripheral surface of the resin sliding layer 3c after cutting and rotated, and the roller is pressed to slightly rotate the inner peripheral surface of the resin sliding layer 3c. It is plastically deformed and precisely finished.

As shown in FIG. 1, the bearing 3 in which the inner peripheral surface of the resin sliding layer 3c is formed into the smooth surface S by the roller burnishing process is a rotary shaft having a hard chrome plated layer 1a formed on the surface thereof. When the outer peripheral surface of the rotating shaft 1 is a hard chrome plating layer 1a, the inner peripheral surface of the bearing 3 and the outer peripheral surface of the rotating shaft 1 are smooth surfaces. And the bearing 3 can be smoothly slid along with the movable pulley 4 along the rotating shaft 1. Even when the movable pulley 4 slides and rotates slightly during gear shifting, the initial stage of assembly In the above, the abrasion of the inner peripheral surface of the resin sliding layer 3c becomes extremely small. Therefore, the gap between the outer peripheral surface of the rotary shaft 1 and the inner peripheral surface of the bearing 3 can be made extremely small at the initial stage of assembling, and after that, since the wear is small and the gap between the bearings does not expand, the movable pulley 4 It is possible to significantly reduce the swing and tilt of the V-belt, suppress the varying load of the V-belt 5, and significantly improve the durability of the V-belt 5.

Further, as described above, since the inner peripheral side of the bearing 3 is formed of the resin sliding layer 3c impregnated with a resin having lubricity, the conventional lubricating oil such as grease is unnecessary, It can be used without lubrication, and there is no slip of the V-belt 5 due to leakage of lubricating oil as in the conventional case, and a good speed change pulley structure can be obtained.

[0010]

[Effect of the device]

 The present invention comprises a stepless pulley including a fixed pulley fixed to a rotary shaft and a movable pulley externally fitted to the rotary shaft and slidably movable on the rotary shaft in a direction in which the fixed pulley is separated from and in contact with the fixed pulley. In a speed change pulley of a transmission, the outer peripheral surface of the rotary shaft is formed as a hard smooth surface, and a bearing is interposed between the outer peripheral surface of the rotary shaft and the inner peripheral surface of the movable pulley. The outer peripheral portion of the movable pulley that contacts the inner peripheral surface of the movable pulley is formed of a steel ring portion, and a sintered porous bronze layer is formed inside the steel ring portion. A resin sliding layer is formed by resin impregnation on the inner peripheral surface that is in sliding contact with the surface, and the inner peripheral surface of this resin sliding layer is a smooth surface that has been roller burnished so that it can be used without lubrication. Of V-belt due to leakage of lubricating oil Lip can be prevented and the inner surface of the bearing is made smooth by roller burnishing processing, so there are no fine protrusions on the inner surface and the initial wear of the bearing inner surface after assembly is reduced. In addition, the bearing clearance at the initial stage of assembly can be extremely reduced, the swinging and tilting of the movable pulley can be reduced, the fluctuating load of the V belt can be suppressed, and the durability of the V belt can be improved. It has the effect of providing a variable speed pulley structure.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a main part of a speed change pulley in a continuously variable transmission.

FIG. 2 is a cross-sectional configuration diagram of a main part of a bearing.

FIG. 3 is an enlarged configuration diagram of FIG. 2.

FIG. 4 is an enlarged cross-sectional configuration diagram on the inner peripheral surface side after cutting the inner peripheral surface of the bearing.

FIG. 5 is an enlarged configuration diagram of a main part of the inner peripheral surface after the inner peripheral surface is further subjected to roller burnishing.

[Explanation of symbols]

 1 rotating shaft 1a hard chrome plated layer 2 fixed pulley 3 bearing 3a steel ring part 3b porous bronze layer 3c resin sliding layer 4 movable pulley 5 V belt P speed change pulley S smooth surface

Claims (1)

Claims for utility model registration: Claim 1. A fixed pulley fixed to a rotary shaft, and a movable member that is slidably moved on the rotary shaft in a direction that is fitted onto the rotary shaft and contacts and separates from the fixed pulley. In a speed change pulley of a continuously variable transmission configured with a pulley, the outer peripheral surface of the rotary shaft is formed as a hard smooth surface, and
A bearing is interposed between the outer peripheral surface of the rotating shaft and the inner peripheral surface of the movable pulley, and the outer peripheral portion of the bearing that contacts the inner peripheral surface of the movable pulley is formed of a steel ring portion. A sintered porous bronze layer is formed inside the ring portion, and a resin sliding layer formed by resin impregnation is formed on the inner peripheral portion that is in sliding contact with the outer peripheral surface of the rotating shaft. The variable speed pulley structure of the continuously variable transmission, wherein the inner peripheral surface of the is formed into a smooth surface subjected to roller burnishing.