JP2516843Y2 - Speed change pulley for metal belt - Google Patents

Description

The present invention relates to a speed change pulley, and more particularly to a speed change pulley that engages with a metal belt.

(Prior Art) Generally, in a speed change pulley, the movable pulley piece is pressed against the fixed pulley piece by the internal pressure of the hydraulic cylinder, and the movable pulley piece is slid according to the rotation speed on the drive side to widen the V groove. It has a structure that changes the winding pitch diameter of the belt.

The speed change pulley is attached to the input shaft and the output shaft of a belt type continuously variable transmission as disclosed in Japanese Patent Laid-Open No. 52-98861, and the rotation speed of the speed change pulley attached to the input shaft is controlled by a Pitot tube. As a result, the internal pressure of the hydraulic cylinder provided in each speed change pulley is controlled based on the fluid pressure detected as a fluid pressure, and the V groove of each speed change pulley is widened. The belt used here is a metal belt, that is, a chain belt in which a tip body is attached to both ends of a pin connecting a plurality of link plate groups, or a plurality of block bodies can be bonded to an endless multi-layer steel band. It is a push transmission type that is mounted so that these block bodies can slide, and the running belt is constantly supplied with oil.
As a result, the friction coefficient between the belt and the pulley is reduced, noise during running of the belt is reduced, and abrasion of the belt is less likely to occur.

(Problems to be solved by the invention) In such a belt-type continuously variable transmission using a transmission belt with a hydraulic cylinder, it is necessary for the output shaft to respond sensitively to changes in the rotational speed of the input shaft. There is. When abrupt gear shifting is required, the movable pulley piece must be moved by the tension of the belt to drastically reduce the volume of the hydraulic cylinder chamber and adjust the internal pressure. However, if this internal pressure becomes higher than necessary, there is a problem that the movable pulley piece cannot be moved sensitively because the movable pulley piece is restricted in movement due to resistance force.

The present invention solves such a problem, and an object of the present invention is to sensitively move the movable pulley piece by appropriately adjusting the internal pressure of the cylinder according to the sudden movement of the movable pulley piece. .

(Means for Solving the Problem) In the metal belt speed change pulley of the present invention, the fixed pulley piece fixed to the rotary shaft and the axially slidable extension of the rotary shaft facing the fixed pulley piece. A movable pulley piece is disposed on the movable pulley piece, and a cylinder provided at the back of the movable pulley piece changes the width of a V groove formed between the fixed pulley piece and the movable pulley piece. Has a supply passage for feeding fluid to the cylinder, and a fluid outflow passage communicating the cylinder with the V groove formed by the fixed pulley piece and the movable pulley piece, and the discharge hole serving as the outlet of the outflow passage has an extension of the rotating shaft. It is formed in the shaft and is formed by at least one inclined hole inclined with respect to the axis of the extension shaft and a vertical hole.

(Operation) According to the metal belt speed change pulley of the present invention, the fluid is constantly sent from the supply passage into the cylinder to maintain the pressure of the cylinder, and the metal belt moves so as to expand the V groove of the pulley. Then, when the volume of the cylinder is suddenly reduced, the fluid in the cylinder is ejected from the discharge hole to the V groove of the pulley through the outflow passage and adheres to both walls of the V groove and the bottom surface of the metal belt. As a result, the metal belt smoothly moves on the wall surface of the pulley and travels with a small noise.

Further, when the discharge hole serving as the outlet of the outflow passage is formed by the inclined hole inclined with respect to the axis of the rotating shaft and the vertical hole, the ejected fluid adheres to both walls of the V groove and the bottom surface of the metal belt. Easier to do.

Furthermore, if the supply passage and the outflow distribution are on the same line,
The fluid always adheres to both walls of the V groove and the bottom surface of the metal belt.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a vertical cross-sectional view of a metal belt speed change pulley according to an embodiment of the present invention. The fixed pulley piece 1 is fixed integrally with the rotary shaft 2, and on the other hand, the movable pulley piece 3 is fitted to a spline 5 provided on the extension shaft 4 of the rotary shaft 2 so as to face the fixed pulley piece 3 so as to move with the fixed pulley piece 3. The metal belt 7 is engaged with the V groove 6 formed by the pulley piece 1.

A cylinder 8 is provided at the back of the movable pulley piece 3. The cylinder 8 is a space surrounded by a hydraulic support plate 9 fixed to the extension shaft 4 of the rotary shaft, a back portion of the movable pulley piece, and a side wall 10 of the cylindrical portion of the pulley piece. The movable pulley piece 3 is moved by moving it. Of course, the packing 11 may be provided on the top of the hydraulic support plate 9.

And a supply passage for sending the fluid to the cylinder 8.
12 is at least one supply hole 13 provided in the extension shaft 4
Through a main passage 14 in the extension shaft 4 to a fluid supply portion (not shown) outside the pulley. In this case, the main passage 14 in the rotary shaft has a fluid pipe 15 at one end thereof.
The pipe connecting material 16 connecting the two is inserted. This pipe connecting member 16 is an idling member so as not to rotate together with the extension shaft 4.
It is fixed to a support member 18 mounted via 17.

On the other hand, an outflow passage for discharging the fluid in the cylinder 8
20 is at least one supply hole 13 provided in the extension shaft.
At least 1 provided in the extension shaft from the main passage 14 through
It is a line that communicates with one discharge hole 21.

Therefore, in this case, the fluid is constantly supplied from the fluid supply unit into the cylinder 8 at a predetermined pressure. When the internal pressure in the cylinder rises, the fluid in the cylinder is
Is not backflowed, but is discharged from the discharge hole 21 into the V groove 6 of the pulley through the discharge passage 20. The discharged fluid needs not only to spray the bottom surface of the metal belt 7 but also to wet the wall surface 22 of the V groove. Therefore, as shown in FIG. 2, as the discharge hole 21, at least two tilt holes 23 and a vertical hole 24 that are tilted with respect to the axis of the extension shaft 4 are provided, and the fluid discharged from the tilt hole 23 is a V groove. The fluid discharged to the wall surface 22 of the and the vertical hole 24 can evenly wet the bottom surface of the metal belt.

FIG. 3 shows another embodiment of the present invention. In this embodiment, a compression spring 26 is built in the cylinder 8 as an auxiliary thrust force. Further, in another embodiment shown in FIG. 4, the compression spring 26 contained in the cylinder 8 has both ends thereof at the hydraulic support plate 9 and the movable pulley piece 3.
They are locked in a state of abutting on the pin-shaped locking portions 27 that are fixed respectively. In this case, the spline 5 provided on the extension shaft becomes unnecessary.

The discharge holes 21 of the above embodiment are the same as those shown in FIG. 2 and have at least one inclined hole 23 and a vertical hole 24.

(Effect) As described above, in the metal belt speed change pulley of the present invention,
Even if the movable pulley piece suddenly moves away from the fixed pulley piece and the internal pressure in the cylinder suddenly rises, the fluid in the cylinder is discharged from the discharge hole of the outflow passage to the V groove of the pulley, and the movable pulley piece is Of the V-groove and the bottom surface of the metal belt are evenly ejected in multiple directions from at least one inclined hole and vertical hole to prevent belt wear and heat generation, It also has the effect of reducing noise while the belt is running. Therefore, the speed change pulley of the present invention can be used particularly for the input shaft or the output shaft of a belt type continuously variable transmission using a metal belt.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a speed change pulley for a metal belt according to the present invention, FIG. 2 is a detailed sectional view around a discharge hole shown in FIG. 1, and FIG. 3 is a metal belt showing another embodiment of the present invention. FIG. 4 is a vertical sectional view of a transmission pulley for metal belts, and FIG. 4 is a vertical sectional view of a transmission pulley for metal belts showing still another embodiment. 1 ... Fixed pulley piece, 2 ... Rotating shaft 3 ... Movable pulley piece, 4 ... Extension shaft 6 ... V-groove, 7 ... Metal belt 8 ... Cylinder, 12 ... Supply passage 13 ... Supply hole , 20 ... Outflow passage 21 ... Discharge hole

Claims (1)

(57) [Scope of utility model registration request] 1. A fixed pulley piece fixed to a rotary shaft, and a movable pulley piece which is axially slidable on the extension of the rotary shaft so as to face the fixed pulley piece and slidable in the axial direction. In a variable speed pulley in which the width of a V groove formed between the fixed pulley piece and the movable pulley piece is varied by a cylinder provided in the cylinder, a supply passage for feeding fluid to the cylinder, a fixed pulley piece and a movable pulley piece. Has a V-shaped groove formed by the above and a fluid outflow passage communicating with the cylinder, and a discharge hole serving as an outlet of the outflow passage is provided in the extension shaft of the rotary shaft and inclined with respect to the axis of the extension shaft. A shift pulley for a metal belt, characterized in that it is formed from at least one inclined hole and a vertical hole.