JPS6224861Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an improvement to a continuously variable speed pulley.

Generally, in continuously variable speed pulleys, when a relative speed occurs between the fixed conical wheel and the moving conical wheel, the side surfaces of the endless V belt suspended in the V groove will wear out due to slipping on one or both sides. This will significantly shorten the durability life. Therefore, it is necessary to configure the movable conical wheel that fits into the boss portion of the fixed conical wheel via the sliding portion so that it can freely slide in the axial direction and can rotate integrally in the circumferential direction. It is. For this reason, in conventional continuously variable speed pulleys, this requirement has been met by providing axial key grooves in both the boss portion and the sliding portion, and mounting parallel keys in these grooves. However, the length of the boss part of the fixed conical wheel is determined by the size of the parallel key derived from the amount of axial movement of the movable conical wheel and the transmitted torque. However, there was a problem in that the thickness of the boss portion and the sliding portion increased by the amount that satisfied each of the above circumstances, resulting in an increase in the size of the entire device.

This invention was made to solve the above problems, and its purpose was to attach a spring receiver to the shaft end of the boss part of a fixed conical wheel.
By connecting multiple leaf springs between this spring receiver and the outer vertical surface of the moving conical wheel,
This interlocking leaf spring performs the same function as the conventional parallel key and coil spring, and completely satisfies the requirements for a moving conical wheel that can slide freely in the axial direction and rotate integrally in the circumferential direction. It is an object of the present invention to provide a continuously variable speed pulley in which the entire size can be easily reduced by eliminating the keyway.

An embodiment of this invention will be described below with reference to the accompanying drawings.

First, to explain the configuration, a fixed conical wheel 1 having a cylindrical boss portion 2 formed in the axial direction, and a movable conical wheel 4 having a cylindrical sliding portion 3 formed in the same axial direction are connected to the above-mentioned boss portion 2. The movable conical wheel 4 is positioned in the axial direction when the endless V-belt 10 is suspended in the V-groove formed between the inner tapered surfaces of both sides by being assembled so as to be movable by the fitting of the sliding portion 3. By moving and changing the V groove width between the two, the endless V
In the continuously variable speed pulley in which the hanging diameter of the belt 10 can be changed steplessly, a plurality of screw holes 2b are provided at intervals in the boss portion shaft end 2a of the fixed conical wheel 1,
At this position, a spring receiver 5 shown below is integrally attached by screwing a bolt 7 into the screw hole 2b. This spring receiver 5 closes one end of a cylindrical portion having a diameter somewhat larger than the outer diameter of the sliding portion 3 of the movable conical wheel 4, and is open at the other end, and has a plurality of rivet holes in this opening. It is formed in such a manner that flanges 5a are provided at intervals and extend in the radial direction.

Next, a bolt or rivet 8 is installed on the outer vertical surface of the movable conical wheel 4 at a position facing the flange 5a of the spring receiver 5. Between this bolt or rivet 8 and the flange 5a of the spring receiver 5, a plurality of plate springs 6 shown below are connected so as to bias the movable conical wheel 4 toward the fixed conical wheel 1. There is. This leaf spring 6 is formed as follows. That is, as shown in FIG. 2, the leaf spring 6 has a central body formed in a disk portion 6a having a somewhat larger diameter than the outer diameter of the sliding portion 3 of the movable conical wheel 4. As shown in FIG. On the outer periphery of the disk portion 6a, an arbitrary number of leg portions 6b made of band-like pieces are provided so as to protrude in a stepped manner in the radial direction. Incidentally, mounting holes 6c are provided on both surfaces of the disk portion 6a and the foot portion 6b as described above.

The leaf spring 6 as described above is constructed by arranging two bodies of the same shape facing each other with the surfaces in contact with the legs 6b, and connecting them concentrically by caulking the rivets 9 in the mounting holes 6c of the legs 6b. Depends on the aspect 2
The plate spring 6 facing the body is attached to the mounting hole 6c of the disc part 6a.
They are connected concentrically by caulking the rivets 9 at. The leaf spring 6 formed by connecting these plural bodies has one disc part 6a in contact with the flange 5a of the spring receiver 5, and the other disc part 6a in contact with the outer vertical surface of the movable conical wheel 4. The disc part 6a is attached to the spring receiver 5 by caulking the rivets 9 to both mounting holes, and the other disc part 6a
a are fixed to the movable conical wheel 4 by the bolts or rivets 8 mentioned above.

Next, the action will be explained.

With the above configuration, the boss portion 2 of the fixed conical wheel 1 is fitted onto the rotating shaft (not shown), and the V groove formed by the inner tapered surfaces of the fixed conical wheel 1 and the movable conical wheel 4 is endless. After hanging the V-belt 10 by connecting both sides with a driven conical wheel (not shown), using the elastic repulsive force of the leaf spring 6, applying pressure to the side surface of the endless V-belt 10. The fixed conical wheel 1 has a spring receiver 5 attached to the boss shaft end 2a and a plurality of interconnected leaf springs 6 installed between the spring receiver 5 and the outer vertical surface of the movable conical wheel 4. It is connected to the movable conical wheel 4 via the movable conical wheel 4. Therefore, the fixed conical wheel 1 and the movable conical wheel 4 can rotate together. That is, the spring receiver 5 is fixed to the boss portion shaft end 2a of the fixed conical wheel 1, and the leaf springs 6 are connected by caulking with rivets 9 to the adjacent mounting holes 6c, and then one of the disk portions 6a is connected. is fixed to the spring receiver 5, and the other disc portion 6a is fixed to the movable conical wheel 4, so that the leaf spring 6
can maintain a fixed state without moving in the circumferential direction. Furthermore, each of the leaf springs 6 described above is connected to each other with rivets 9, and the inner plate portion 6a and the foot portion 6b are formed in a step shape, so that the leaf springs 6 are elastic in the axial direction. It is now possible to expand and contract. As a result, the movable conical wheel 4 fitted into the boss portion 2 of the fixed conical wheel 1 can freely slide in the axial direction and rotate integrally in the circumferential direction by the plate spring 6 of the above-mentioned embodiment. It is possible to completely satisfy the necessary conditions.

As explained above, in this invention, a spring receiver 5 is attached to the shaft end 2a of the boss portion of the fixed conical wheel 1, and a plurality of leaf springs 6 are installed between the spring receiver 5 and the outer vertical surface of the movable conical wheel 4. When attached in a connected manner, this leaf spring 6 performs the same function as the conventional parallel key and coil spring, and forms a movable cone that can freely slide in the axial direction and rotate integrally in the circumferential direction. In addition to completely satisfying the requirements for the wheel 4, since the parallel key is eliminated, there is no wear and tear or rust at the position corresponding to the key groove in the sliding part 3 of the movable conical wheel 4, and the key By eliminating the groove, it becomes possible to reduce the wall thickness of the boss portion 2 of the fixed conical wheel 1 and the sliding portion 3 of the movable conical wheel 4 and the length of the boss portion 2 to the necessary minimum, resulting in a smaller overall size. This has the effect of making it easier to achieve

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing the configuration and operation of the main parts of the continuously variable speed pulley according to this invention, and FIG. 2 is a perspective view showing a single plate spring, which is the main part of the continuously variable speed pulley. Explanation of symbols: 1... fixed conical wheel, 2... boss part, 2a... shaft end, 2b... screw hole, 3... sliding part, 4... moving conical wheel, 5... spring receiver,
5a...flange, 6...plate spring, 6a...disc part, 6b...foot part, 6c...mounting hole, 7...bolt, 8...bolt or rivet, 9...rivet, 10... V-belt.

Claims (1)

[Scope of utility model registration request] A continuously variable transmission in which an endless V-belt 10 is suspended in a V-groove formed by a fixed conical wheel 1 and a movable conical wheel 4 that is slidably fitted onto the outer periphery of the boss portion 2 of the fixed conical wheel 1. In the pulley, the fixed conical wheel 1
A spring receiver 5 having a flange 5a in a cylindrical opening with one end closed is attached to the shaft end 2a of the boss portion. One disk portion 6a of a leaf spring 6 is attached to a disk portion 6a having a large inner diameter, and an arbitrary number of foot portions 6b are provided in a stepped manner in the radial direction.
The members are coupled together by rivets or the like, and the other disk portion 6a of the leaf spring 6 is attached to the outer vertical surface of the movable conical wheel 4, and the fixed conical wheel 1 is attached to the movable conical wheel 4.
A continuously variable speed pulley characterized in that there is no parallel key between the boss part 2 and the sliding part 3 of the movable conical wheel 4.