JPH0649256B2 - Method for processing movable sheave in pulley device for continuously variable transmission, and mounting device used therefor - Google Patents

Description

Detailed Description of the Invention

[Industrial applications]

The present invention relates to a continuously variable transmission, and more particularly, to a pulley device in a continuously variable transmission that uses a belt in which a large number of V blocks are continuously arranged on a metal endless band generally called a Van Donne type. The present invention relates to a method for processing a movable sheave of the pulley device, and an attachment device for holding the movable sheave when processing a reference surface of the movable sheave in the processing.

[Prior art]

Recently, a transmission for an automobile using a van-donnay type continuously variable transmission has been devised. As shown in FIG. 3, the transmission 1 comprises a clutch 2, a forward / reverse switching mechanism 3, a continuously variable transmission 5, a reduction gear mechanism 6 and a differential gear mechanism 7. Clutch 2 consists of a powder electromagnetic clutch to rotate engine rank shaft 10 and sleeve shaft 11
Can be transmitted to or cut off from the gear 12 of the forward / reverse rotation switching mechanism 3 via. Further, the forward / reverse rotation switching mechanism 3 has a shifter 13 and a reverse rotation gear train 15, and by switching the shifter 13, the gear
12 rotations directly or through the reverse gear train 15 continuously variable transmission 5
Can be transmitted to the primary pulley device 16. The continuously variable transmission 5 includes a primary pulley device 16, a second pulley device 17, and a Van Donnay type belt 19. The pulley devices 16 and 17 are fixed sheaves 16a and 17a and ball splines 20 and 20 on the fixed sheaves, respectively. It is composed of movable sheaves 16b and 17b slidably inserted through. Further, a large-diameter piston member 21 is fixed to the movable sheave 16b of the primary pulley device 16, and the piston member 21 cooperates with a cylinder member 22 fixed to the fixed sheave 16a to reduce a relatively large pressure receiving area. Which constitutes a hydraulic actuator 23. In addition, the movable sheave 17 of the secondary pulley device 17
A small diameter cylinder member 25 is fixed to b, and the cylinder member 25 is a piston member fixed to a fixed sheave 17a.
Together with 26, a hydraulic actuator 27 having a relatively small pressure receiving area is formed. A spring 29 is provided between the movable sheave 17b and the piston member 26 in a contracted manner to apply an initial pressing force to the pulley device 17. On the other hand, a pump 31 is directly connected to the engine crankshaft 10 via a shaft 30 penetrating each sleeve shaft, and the discharge oil from the pump 31 is transferred to a primary through a control valve (not shown) and an oil passage 32. It communicates with the hydraulic actuator 23 of the pulley device 16 and also communicates with the hydraulic actuator 27 of the second pulley device 17 via the oil passages 33 and 35. The hydraulic actuator 23 on the primary pulley device 16 side is configured so that the hydraulic pressure from the control valve does not leak. A leaking means 38 such as the above is formed, and is configured to leak a predetermined amount of oil.
A gear 37 of the reduction gear mechanism 6 is fixed to a shaft portion 36 integrally formed with the fixed sheave 17a of the secondary pulley device 17, and the gear 37 is connected to a differential gear mechanism via a reduction gear train 39. 7, the left and right axles 40, 40 extend from the differential gear mechanism 7. Based on the above configuration, the rotation of the engine crankshaft 10 is transmitted to the gear 12 by the connection of the clutch 2, and further the shifter 13
The direct rotation from the gear 12 is continuously variable by changing the
Or the reverse rotation is transmitted to the continuously variable transmission 5 via the reverse gear train 15. Then, in the continuously variable transmission 5,
Based on the effective diameters of the pulley devices 16 and 17 that are appropriately set by the movable positions of the movable sheaves 16b and 17b of the primary pulley device 16 and the second pulley device 17, a continuously variable speed is achieved via a belt 19 and further the reduction gear mechanism 6 The rotation at a predetermined speed is transmitted to the axles 40, 40 via the differential gear mechanism 7. At this time, the pump 31 is driven by the engine crankshaft 10 via the shaft 30, and the oil discharged from the pump 31 is supplied / blocked or discharged to the hydraulic actuator 23 of the primary pulley device 16 via the control valve. At the same time, it is constantly supplied to the hydraulic actuator 27 of the secondary pulley device 17 via the oil passages 33 and 35. When pressure oil is introduced into the primary side hydraulic actuator 23 under the control of the control valve, the movable sheave 16b moves to the fixed sheave 16a side to increase the effective diameter of the pulley device 16, while the secondary side hydraulic actuator 27 is moved. Has always introduced pressure oil,
Since the pressure receiving area is set smaller than that of the primary side hydraulic actuator 23, the primary pulley device 16
Of the secondary pulley device 17 by moving the movable sheave 17b in the direction away from the fixed sheave 17a against the hydraulic pressure acting on the actuator 27 via the belt 19 as the movable diameter of the secondary pulley device 17 increases. Becomes smaller, and as a result, the continuously variable transmission 5 is shifted in the speed increasing direction. On the contrary, when the oil in the primary side hydraulic actuator 23 is discharged by the control of the control valve, the effective diameter of the primary pulley device 16 becomes small based on the hydraulic pressure (and the spring 29) constantly acting on the secondary side hydraulic actuator 27. At the same time, the effective diameter of the secondary pulley device 17 is increased, which causes the continuously variable transmission 5 to shift in the deceleration direction. By the way, the pulley devices 16 and 17 are fixed sheaves 16a and 17a.
Movable sheave 16b via ball spline 20 on the shaft of
Although 17b is slidably supported, the movable sheave is required to smoothly slide on the shaft portion and to smoothly rotate without changing the inclination angle of the tapered surface in contact with the belt 19. ing. For this reason, it is necessary to machine the tapered sheaves of the movable sheaves 16b, 17b so that the runout accuracy of the tapered surfaces with respect to the ball spline groove becomes a predetermined high precision. The parts were used as a reference for high-precision processing, and then the tapered surface was subjected to precision processing (grinding, etc.) and the ball spline groove was precision processed (grinding, etc.) based on the processing reference surface. As a work holding device in which the inner hole of the work is supported by using a taper rod and a ball, an actual open shovel 56-1
There is Japanese Patent No. 26337.

Therefore, in the conventional processing method, since the processing reference surface is processed with reference to the central hole of the movable sheave, the precision processing (grinding) of the tapered surface and the ball Precision processing (grinding) of the spline groove is also required, and processing of the ball spline groove requires a special whetstone such as a borazon small diameter whetstone.
In addition, special precision processing equipment is indispensable for that purpose, which makes processing extremely expensive and hinders mass production.

[Means for solving problems]

The present invention solves the above-mentioned problems, and the movable sheaves 16b, 17 are
An object of the present invention is to provide a method for processing a movable sheave that enables high-precision processing at low cost and further enables mass production, and an attachment device that holds the movable sheave when processing a reference surface of the movable sheave. Is. Then, in the processing method according to the present invention, when processing the reference surface of the movable sheave, as shown in FIG. 1 (c), at least two ball spline grooves 20a of three rows or more are separated by a predetermined distance.
It is characterized in that the machining reference surface 42 is machined in a state where the ball spline groove 20a is held as a machining certificate by the mounting device 43 which comes into contact with each spline groove at the positions a and b. In addition, the movable sheave mounting device according to the present invention, as shown in FIG. 2, has the first taper rod 51 that is axially movably fitted into the mounting body 49 when processing the movable sheave reference surface. , And a second taper rod that moves in the same direction as the first taper rod 51 is continuously drawn by the drawbar 53 and the like.
Equipped with 55. The first and second taper rods 51, 55 have tapered surfaces 51b, 55a, respectively, and further, on these tapered surfaces, at positions corresponding to the ball spline grooves 20a in three or more rows. First and second pieces 56 and 57 are arranged at 49 so as to be movable in the radial direction. And, these pieces 56 and 57 are tapered surfaces of the taper rod.
It is characterized by having tapered surfaces 56a, 57a aligned with 51b, 55a and projections 56b, 57b capable of abutting and engaging with the ball spline groove 20a.

[Action]

Since the mounting device according to the present invention is configured as described above, by moving the first taper rod 51, the first piece 56 is moved at least at the predetermined annular position a by the wedge action of both tapered surfaces 51b and 56a. At the location, it moves in the outer diameter direction and abuts / engages with the ball spline groove 20a. At the same time, the second taper rod that continuously links with the first taper rod 51.
The movement of 55 causes the second piece 57 to move in the outer diameter direction at least at three positions at the annular position b, which is separated from the position a by a predetermined distance, by the wedge action of both the tapered surfaces 55a and 57a, and the ball spline groove. Abut and engage with 20a. As a result, the movable sheave 16b is mounted and held by the mounting device using the ball spline groove 20a as a processing certificate.

【Example】

Embodiments according to the present invention will be described below with reference to the drawings. First, a method of processing a movable sheave according to the present invention will be described based on FIG. The movable sheave, for example, the primary side movable sheave 16b is the first
As shown in FIG. (A), a blanking process is performed to form a hole 41 at the center of the fixed sheave shaft for fitting and inserting.
Then, as shown in FIG. 1 (b), broaching is performed to form three rows of ball spline grooves 20a, and then heat treatment (carburizing treatment) is performed. The amount of deformation due to the heat treatment is absorbed by the ball diameter of the ball spline 20 and the tolerance of the spline grooves of the fixed sheaves 16a, 17a, so that no processing for correcting thermal deformation is performed. Then, in this state, as shown in FIG. 1 (c), the movable sheave 1
The outer diameter portion 42 of 6b is machined with high precision to ensure a reference surface, but at this time, the ball spline groove 20a abuts three rows of spline grooves at two positions a and b spaced apart by a predetermined distance. With the mounting device 43, the ball spline groove 20a
Is attached as a reference machining certificate, and the reference surface 42 is precisely machined in this state. After that, as shown in FIG. 1 (d), the reference surface 42 is held as a reference by a holder 45, and in this state, the taper surface 46 which is the belt contact surface is precisely ground. Note that the ball spline groove 20a does not need to be ground in principle because the runout accuracy is kept high by grinding the tapered surface 46 based on the reference surface 42 that uses the spline groove as a processing certificate. For example, even when the ball spline groove 20a is processed while the reference surface 42 is held by the holder 45, the grinding allowance is minimal, and a simple finishing process such as burnishing instead of the grinding process provides sufficient runout accuracy. Can be guaranteed. Next, the attachment device 43 of the movable sheave 16b in the processing of the processing reference surface 42 shown in FIG. 1 (c) will be described with reference to FIG. The attachment device 43 has an attachment main body 49, and a hole 49a is formed in the center of the attachment main body 49, and the outer periphery of the attachment 49 is a natural clamp for clamping the workpiece in a natural state. A receiver 50 is installed. Furthermore,
The main body hole 49a is movable in a predetermined amount direction by the flange 51a and is prevented from being rotated by the key 52, so that the first taper rod
One end of the rod 51 is connected and fixed to the spindle 54, and the other end has a tapered surface 51.
b is formed. Further, a stepped through hole 51c is formed in the center of the rod 51, and a draw bar 53 is fitted in the hole 51c. The draw bar 53 has a disc spring 60 contracted between one end head portion 53a and the step of the rod hole portion 51c and is erroneous in the left direction of the drawing, and the other end is the first.
A screw portion 53b is formed so as to project from the taper rod 51. A second taper rod 55 is fixed to the protruding screw portion 53b, and the rod 55 has a taper surface 55a similar to the taper surface 51b of the first taper rod. The movable sheave 16b is provided on each of the first taper rod taper surface 51b and the second taper rod taper surface 55a.
The first and second pieces 56, 57 are arranged so as to correspond to the three rows of ball spline grooves 20a. Therefore, the two sets of pieces 56, 57 composed of these three pieces are separated by a predetermined distance from the spline groove 20a. The spline groove 20 at two positions a and b, that is, 3 × 2 positions.
It can abut and engage a. Also, the first and second pieces 56, 57
Are holes 49 formed in the boss portion 49d of the attachment body 49, respectively.
b and 49c are movably fitted in the radial direction, and the inner peripheral surfaces thereof are tapered surfaces 56a and 57a which are inclined so as to be able to be fitted with the rod taper surfaces 51b and 55a, respectively, and the outer peripheral portions thereof are respectively formed. Protrusions 56b and 57b that can be engaged with the spline groove 20a are formed, and the main body is further circumferentially formed.
Spring rings 59, 59 are wound around 49, and are biased so that the two tapered surfaces 56a, 51b and 57a, 55a are always in close contact with each other. Since the present embodiment is configured as described above, first, the movable sheave 16b is attached to the attachment body boss 49d by aligning the three rows of the ball spline grooves 20a with the three-piece pieces 56 and 57. Inserted and the sheave taper surface 46 receives the workpiece 50
Push it in until it touches. Then, when a chuck switch (not shown) of the processing machine is turned on in this state, the first taper rod 51 is pulled in the left direction (arrow direction) in the drawing through the spindle 54, and the wedge action of the tapered surfaces 51b and 56a is further achieved. As a result, the first piece 56 moves in the outer diameter direction (the direction of the arrow) against the spring ring 59, and the three pieces 56 are provided with the protrusions 56b in three positions.
The ball spline grooves 20a of the row are respectively brought into contact with and engaged with each other. Further, by the leftward movement of the first taper rod 51, the draw bar 53 is moved in the same direction via the disc spring 60, and the second taper rod 55 is also moved leftward (in the arrow direction) integrally with the draw bar 53. Then, similarly, the tapered surfaces 55a and 57a
Due to the wedge action, the second piece 57 also moves in the outer diameter direction (arrow direction) against the spring ring 59, and the projections 57b of the three pieces 57 abut the three rows of ball spline grooves 20a, respectively. Engage. As a result, the movable sheave 16b has three rows of spline grooves at two positions a and b which are separated by a predetermined distance.
It is held with the ball spline groove as a reference by two sets of pieces 56 and 57 that come into contact with and engage with the 20a, and the sheave taper surface 46 is backed up by the work receiver 50 that is made of a natural clamp. The outer outer diameter portion 42 of the sheave is machined with high precision. Then, when the processing of the processing reference surface 42 is completed, the chuck switch is turned off, the first taper rod 51 is returned to the right direction via the spindle 54, and at the same time, the second taper rod 55 is also returned to the same direction, and the spring ring. The 59 moves the first and second pieces in the inner diameter direction, and the mounting and holding of the movable sheave 16b by the mounting device 43 is released.

【The invention's effect】

Since the present invention is configured as described above, the ball spline groove 20a is held as a machining certificate by the mounting device 43 that abuts each spline groove at at least two positions a and b separated by a predetermined distance from the ball spline groove 20a. Since the machining reference surface 42 is machined in this state, the relationship between the ball spline groove and the machining reference surface 42 is defined with high accuracy.
Post-processing such as the sheave taper surface 46 processed based on 42 is also maintained with high accuracy in relation to the ball spline groove,
The runout accuracy of the movable sheave 16b can be stored with high accuracy, and the ball spline groove 20a does not have to be processed. Even if it is done, simple finishing is sufficient, and the ball spline groove can be used as a processing certificate. In addition to facilitating the post-machining process based on the highly accurate machining reference surface 42, the machining cost of the movable sheave can be significantly reduced. Further, the attachment device 43 of the movable sheave 16b has a very simple structure including the first and second taper rods 51 and 55 and the first and second pieces 56 and 57, and only moves the first taper rod 51. It is very easy to attach and hold the movable sheave, and the first and second pieces 5
Since 6 and 57 contact and engage with each ball spline groove at positions a and b which are separated by a predetermined distance from the ball spline groove 20a,
The movable sheave can be attached and held reliably and accurately using the ball spline groove as a reference machining certificate, enabling mass production of movable sheaves. Furthermore, when the sheave taper surface 46 is received by the workpiece receiver 50 consisting of a natural clamp on the fixture main body 49, the reference machining surface
It is possible to prevent the sheave from being deformed by the resistance during the processing of 42, and by the heat treatment step or the preprocessing step,
It is possible to cancel those in which the tapered surface 46 significantly rubs the ball spline groove 20a, eliminate unnecessary processing by early detection of defective products, and further improve accuracy. it can.

[Brief description of drawings]

1 (a) to 1 (d) are front sectional views showing respective steps of a method of processing a movable sheave according to the present invention, FIG. 2 is a front sectional view showing a mounting device for the movable sheave, and FIG. FIG. 1 is an overall cross-sectional view showing a transmission equipped with a continuously variable transmission that is the basis of FIG. 1 ... Transmission, 5 ... Continuously variable transmission, 16 ...
Primary pulley device, 16a ...... Fixed sheave, 16b ......
Movable sheave, 17 …… Secondary pulley, 17a …… Fixed sheave, 17b …… Movable sheave, 19 …… (Ban-donnay type)
Belt, 20 ...... Ball spline, 20a ...... Ball spline groove, 41 ...... Hole, 42 ...... Machining reference plane, 43 ...... Mounting device, 45 ...... Holder, 46 ...... Sheave taper surface, a, b ......
2 positions, 49 …… Mounting fixture body, 50 …… Workpiece receiver, 51 ……
1st taper rod, 51b ... taper surface, 53 ... drawbar, 55 ... 2nd taper rod, 55a ... taper surface, 56 ...
… 1st piece, 56a …… Tapered surface, 56b …… Protrusion, 57 ……
Second piece, 57a ... Tapered surface, 57b ... Projection.

Claims (2)

[Claims] 1. A method of machining a movable sheave in a pulley device for a continuously variable transmission, comprising a movable sheave slidably supported by a shaft portion of a fixed sheave via a ball spline, the central portion of the movable sheave. A blank forming step of forming holes in the hole, a broaching step of forming three or more rows of ball spline grooves in the holes formed by the blank forming, and each of these ball spline grooves at at least two positions separated by a predetermined distance. A machining reference machining step of machining the machining reference surface with the ball spline groove held as a machining certificate by a mounting device that abuts against the spline groove, and a taper of the movable sheave with the machining reference surface held further. A method of processing a movable sheave, which comprises a post-processing step of processing a surface or the like. 2. A mounting device used for machining a reference surface of a movable sheave in a pulley device for a continuously variable transmission, which has a movable sheave slidably supported by a shaft portion of a fixed sheave via a ball spline. A first taper rod that is axially movably fitted into the fixture body, and a second taper rod that moves continuously in the same direction by continuously pulling the first taper rod, and these first and second taper rods Respectively have tapered surfaces, and further, on these tapered surfaces, first and second pieces are respectively movably arranged in the radial direction so as to correspond to the ball spline grooves of three rows or more, and these pieces are provided. Has a taper surface that matches the taper surface of the taper rod and a projection that can abut and engage with the ball spline groove.