JPH02180343A - Belt type continuous transmission with centrifugal weight - Google Patents

Abstract

PURPOSE:To facilitate belt replacing work by supporting a stationary sheave between a flange on a threaded member and the end face of a rotary shaft in such a way as pinched thereby, and driving a bolt into the end face of a mounting shaft while inserted through the center holes of the threaded member and rotary shaft. CONSTITUTION:When a belt 17 is to be replaced, for ex. a mounting bolt 15 on the follower pulley 9 side and a holddown screw 13 are loosened to remove a stationary sheave 10, and upon replacement of the belt 17, the tip of this holddown screw 13 is driven into the threaded portion 4e of the center hole of a follower shaft 4. The stationary sheave 10 can be mounted in the regular position against the energization force of a follower spring 38 only by driving the screw 13, and thereafter it is required only to drive the mounting bolt 15 into a threaded hole 2a in a counter-shaft 2. Another procedure is to use a holddown screw 19 and a mounting bolt 21 to fit and remove a spring receptacle 18 on the drive pulley 5 side.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is a belt that changes speed by changing the pulley diameter of a variable pulley by moving a centrifugal weight using centrifugal force that changes depending on the rotation speed. This invention relates to technology for improving automatic transmissions.

(Prior Art) Conventionally, automatic transmission devices equipped with this type of centrifugal weight are generally well known, as shown in, for example, Japanese Patent Laid-Open No. 63-9762. That is, this transmission device includes a fixed shave that is non-slidably and rotationally fixed on the rotating shaft, and a fixed shave that rotates and slides so as to form a belt groove between the fixed shave and the fixed shave on the rotating shaft. A cam member comprising a variable pulley consisting of a movable shaver that is movably supported, the cam member being disposed on the back side of the movable shaver so as to move integrally with the movable shaver in the axial direction, and having a tapered cam surface inclined in a predetermined direction. a weight support member disposed on the back side of the movable shave and having a support surface extending radially outward so as to approach the cam surface; and a weight support member disposed on the back side of the movable shave to fix the movable shave. A centrifugal weight is provided between the cam surface and the support surface so as to be able to roll in the radial direction, and the centrifugal weight is moved by changes in centrifugal force caused by rotation of the rotating shaft. By rolling in the radial direction and pressing the cam member against the cam surface, the movable shaver slides against the biasing force of the spring, thereby changing the radius of the variable pulley and changing speed. .

(Problem to be Solved by the Invention) By the way, when such an automatic transmission is installed in a machine in which the distance between the shafts cannot be shortened, when replacing a worn belt, the belt may sink into the belt groove of the pulley. Since it is difficult to remove a belt that is stuck in the pulley by climbing over the outer peripheral edge of the pulley, it is common practice to first remove the pulley itself from the mounting shaft and then remove the belt from the belt groove. However, removing the pulley from the mounting shaft is an extremely troublesome task, and a structure that allows the belt to be easily replaced is desired.

Therefore, if the fixed shave, which is a component of the variable pulley, and the spring receiver of the spring that biases the movable shave toward the fixed shave can be independently removed,
Since the belt groove can be opened and the belt can be taken out without removing the pulley itself from the mounting shaft, the belt can be easily replaced. However, in this case, the fixed shave or spring receiver is usually attached to the rotating shaft by press-fitting because the belt is rarely replaced, and therefore, although the fixed shave or spring receiver can be easily removed, When reinstalling the belt after replacement, it is necessary to use a hydraulic press or a special jig to compress the spring in its free length while press-fitting the fixed shave or spring receiver onto the rotating shaft, which makes assembly work more difficult. becomes troublesome.

Further, when the variable pulley is not assembled to the mounting shaft, it is advantageous in terms of handling that the fixed shave and spring receiver are integrated with other parts to form a unit.

The present invention has been made in view of the above points, and the object thereof is to provide a structure in which the fixed shave or spring receiver of the variable pulley can be removed independently, and by further improving the assembly structure, the variable pulley can be removed. To maintain a compact transmission by shortening the length in the axial direction, and to easily assemble a fixed shave or a spring receiver, thereby facilitating belt replacement work and variable pulley assembly work. There is a particular thing.

(Means for solving the problem) In order to achieve this object, the invention described in claim (1):
Basically, a fixed shave is non-slidably and rotatably fixed to the drive-side rotating shaft, and the fixed shave is rotatably and slidably fixed to the drive-side rotating shaft so as to form a belt groove between the two. A drive pulley consisting of a movable shave supported by a drive pulley, a fixed shave fixed to a driven rotation shaft parallel to the drive rotation shaft in a non-pulsating manner and rotationally integral with the drive pulley; a driven pulley consisting of a movable shaver rotatably and slidably supported so as to form a belt groove therebetween; a belt hung between each belt groove of the drive and driven pulley; and the drive or driven pulley. a cam member having a cam surface that is connected to the rear side of one of the movable shavers so as to be movable in the axial direction and is inclined in a predetermined direction toward the outside in the radial direction, and a cam surface of the cam member; The cam surface of the cam member is suppressed by the centrifugal weight, which is disposed on the top so as to be able to roll outward in the radial direction of the rotating shaft. The premise is a pulley-type automatic transmission in which the speed of rotation of both rotating shafts is changed by moving a movable shaver toward and away from a fixed shaver.

A spring receiver disposed on the rear side of the movable shaver of at least one of the driving or driven pulleys is compressed between the spring receiver and the movable shaver, and urges the movable shaver in a direction toward the fixed shaver side. A spring is provided.

Furthermore, at least one of the driving side or driven side rotating shaft is provided in a cylindrical shape having a center hole into which a mounting shaft can be fitted, and a threaded portion is formed on the inner surface of one end of the center hole, and the threaded portion has a flange portion. and a ring-shaped screw member having a center hole are screwed together, the fixed shave is supported under pressure between the flange of the screw member and the end face of the rotating shaft, and a bolt is inserted between the respective centers of the screw member and the rotating shaft. It is configured to be inserted through the hole and screwed onto the end face of the mounting shaft.

Further, in the invention as set forth in claim (2), in the pulley type automatic transmission, the spring holder is supported under pressure between the flange portion of the threaded member and the end face of the rotating shaft, and the bolt is threaded. The member is inserted through each center hole of the rotating shaft and is screwed onto the end face of the mounting shaft.

(Function) With the above configuration, in the invention described in claim (1), when replacing the belt hung between the respective belt grooves of the driving and driven pulleys, the bolts are loosened and removed, and then the screw members are loosened. As a result, the fixed shave of the pulley, which was held between the flange portion of the screw member and the end face of the rotating shaft, is pushed by the biasing force of the spring and falls off from the rotating shaft. Next, after replacing the belt, lock the fixed shave to the flange of the screw member, and in this state, screw the tip of the screw member into the center hole thread of the rotating shaft. The fixed shave is held between the flange portion of the screw member and the end face of the rotating shaft.

Thereafter, bolts are screwed onto the end surface of the mounting shaft through the threaded member and each center hole of the rotating shaft.

Therefore, in this case, the fixed shave of the driving or driven pulley is removed and the belt groove is opened to replace the belt.
There is no need to attach or detach the pulley itself from the mounting shaft, and the belt can be easily replaced.

In addition, when installing the fixed shave after replacing the belt, it is only necessary to screw the tip of the screw member into the center hole thread of the rotating shaft while the spring is in a substantially free length state and its biasing force is small. After screwing, the fixed shave can be fixed by simply tightening the screw member, automatically compressing the spring, and the fixed shave can be installed without the need for a hydraulic press or special jig to compress the spring. The fixed shave can be easily attached and detached, and furthermore, the belt can be replaced easily.

Furthermore, since the fixed shave is held between the threaded members that are threaded into the threaded part of the center hole of the rotating shaft, the length of the threaded member is made longer so that the tip of the spring can be threaded into the threaded part of the rotating shaft when the spring is in its free length state. Also, compared to, for example, the case where a nut is screwed onto the outer periphery of the rotating shaft and a fixed shave is fastened by the nut I, the overall length of the rotating shaft can be shortened by the amount that the screw member is inserted into the rotating shaft. Therefore, the transmission can be kept compact.

In addition, the fixed shave is fastened and fixed to the rotating shaft by a screw member, so even if the drive or driven pulley is not attached to the mounting shaft, the fixed shave can be rotated together with the movable shave and other parts. It can be integrally attached to the shaft to form a unit, preventing each component from becoming separated and improving its handling and operability.

On the other hand, in the invention set forth in claim (2), the belt is replaced by removing the spring receiver on the back side of the movable shaver of the driving or driven pulley in the same way as described above. Therefore, there is no need to attach or detach the pulley from the mounting shaft, and the belt can be easily replaced.

In addition, when installing the spring receiver, when the spring is stretched and its urging force is small, screw the tip of the screw member into the threaded part of the center hole of the rotating shaft, and then tighten the screw member to automatically release the spring. The spring receiver can be fixed while being compressed, the spring receiver can be easily attached and detached, and belt replacement work can also be facilitated.

Furthermore, since the spring receiver is held between the threaded parts that are screwed into the threaded part of the center hole of the rotating shaft, the overall length of the rotating shaft is shortened by the amount that the threaded parts are inserted into the rotating shaft, keeping the transmission compact. be able to.

In addition, since the spring receiver is fastened and fixed to the rotating shaft with a screw member, even if the drive or driven pulley is not attached to the mounting shaft, the spring receiver can be fixed or integrally attached to the rotating shaft together with the movable shaver and other parts. It can be attached and made into a unit, improving the handling and operability of the pulley.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows a belt-type automatic transmission device A according to an embodiment of the present invention.
The overall configuration is shown. 1 is an automobile engine (not shown)
The crankshaft 2 is a counter that is arranged parallel to the side of the crankshaft 1 and rotatably supported by the cylinder block of the engine. +b, these two shafts 1.2 constitute mounting shafts, and screw holes 1a and 2a are formed in the center of the tip surfaces of the crankshaft 1 and the countershaft 2, respectively.

Reference numeral 3 denotes a cylindrical drive shaft as a drive-side rotating shaft having a center hole 3a, and a threaded portion 3C is provided at the tip end (lower end in the figure) of the center hole 3a, and a threaded portion 3C is provided at the base end (same as above). A large diameter portion 3b having a larger diameter than other portions is formed at the end portion),
By press-fitting the tip of the crankshaft 1 into the large diameter portion 3b, the drive shaft 3 is attached to the crankshaft 1 concentrically and rotationally integrally. Reference numeral 4 denotes a substantially cylindrical driven wheel as a driven rotation shaft disposed parallel to the drive shaft 3, and a threaded portion 4e is provided at the tip of the center hole 4a (lower end in the figure) of the driven shaft 4. is formed. The counter shaft 2 is press-fitted from the base end (upper end in the figure) of the center hole 4a, and due to this structure, the driven shaft 4 is connected to the counter shaft 2.
It rotates concentrically and is attached to the unit.

A drive pulley 5 is provided on the drive shaft 3, which is a variable pulley consisting of flange-shaped fixed and movable shaves 6, 7. (1 side end) by press-fitting and is fixed so that it cannot rotate integrally and cannot slide. Further, the movable shaver 7 has a drive shaft 3 facing the fixed shaver 6.
The belt groove 8 is slidably supported at the boss portion 7a via sealing gaskets 43 and 43, and a belt groove 8 having a V-shaped cross section is formed between the shavers 6 and 7.

On the other hand, on the driven shaft 4, there is provided a driven pulley 9 which, like the drive pulley 5, is a variable pulley consisting of a flange-shaped fixed and movable shave 10°11, and the fixed shave 10 has a boss portion thereof. At 10a, it is fixed to the tip (lower end in the figure) of the driven shaft 4 so as to be rotatable and non-slidable. That is, a cylindrical pressing screw 13 as a screw member having a central hole 13b is screwed into the threaded portion 4e on the tip side of the center hole 4a of the driven shaft 4, and a flange portion 13a is formed at one end of this pressing screw 13. By screwing the pressing screw 13 into the threaded portion 4e of the driven shaft 4, the pressing screw 1
A stationary shaft 10, which is engaged with the driven shaft 4 by a parallel pin 14, is held between the flange portion 13a of No. 3 and the tip of the driven shaft 4 by its boss portion 10a, and is rotationally fixed to the driven shaft 4. has been done. On the other hand, the movable shaver 11 has a sealing gasket 16 attached to the driven shaft 4 at a boss portion 11a so as to face the fixed shaver 10 in a direction opposite to the direction in which the movable shaver 7 faces the fixed shaver 6 in the driving pulley 5. A belt groove 12 having a V-shaped cross section is formed in both of the shavers 10 and 11#jJ. Reference numeral 15 denotes a mounting bolt made of a hexagonal bolt, the tip of which is inserted through the center hole 13b of the pressing screw 13 and the center hole 4a of the driven shaft 4, and is screwed into the tip screw hole 2a of the counter shaft 2. With this structure, the driven pulley 9 is rotatably fixed to the counter shaft 2 with a mounting bolt 15.

And the belt groove 8.1 of the driving and driven pulley 59
A V-belt 17 is wound between the pulleys 5 and 9, and by moving the movable shavers 7 and 11 of the pulleys 5 and 9 toward and away from the fixed shavers 6° and 10 in opposite directions, the pulleys 5 Adjust the pulley diameter (effective radius for the V-belt 17) of .9 to variable:A. For example, when the movable shave 7 of the drive pulley 5 is brought closer to the fixed shave 6 to increase the pulley diameter of the drive pulley 5, the resulting V
By moving the belt 17 toward the drive pulley 5, the movable sheave 11 of the driven pulley 9 is separated from the fixed sheave 10, and the pulley diameter of the driven pulley 9 is made smaller than that of the drive pulley 5. Increase the gear ratio between the two to increase the speed.

On the other hand, as shown by the imaginary line in the figure, the movable shave 7 of the drive pulley 5 is separated from the fixed shave 6, and the drive pulley 5
When the pulley diameter of the driven pulley 9 is made smaller, the movable shave 11 of the driven pulley 9 approaches the fixed shave 10 by moving the V-belt 17 toward the driven pulley 9, thereby making the pulley diameter of the driven pulley 9 larger than that of the driving pulley 5. By doing so,
The gear ratio between both shafts 3.4 is reduced to achieve a deceleration state.

A disk-shaped spring receiver 18 is rotatably and non-slidably attached to the drive shaft 3 on the back side (lower side in the figure) of the movable shaver 7 of the drive pulley 5. That is, a cylindrical pressing screw 19 as a threaded member having a central hole 19b is screwed into the threaded portion 3C on the tip side of the center hole 3a of the drive shaft 3, and a flange portion 19a is formed at one end of this pressing screw 19. By screwing the pressing screw 19 into the threaded portion 3C of the driving shaft 3, a parallel pin 20 is engaged with the driving shaft 3 between the flange portion 19a of the pressing screw 19 and the tip of the driving shaft 3. A spring receiver 18 is sandwiched and fixed to the drive shaft 3 so as to rotate integrally therewith. Further, reference numeral 21 denotes a mounting bolt consisting of a hexagonal bolt, which is inserted through the center hole 19b of the pressing screw 19 and the center hole 3a of the drive shaft 3, and is screwed into the tip screw hole 1a of the engine sink crankshaft 1. With this structure, the drive pulley 5 and the spring receiver 18 are rotationally fixed to the crankshaft 1 with mounting bolts 21.

On the outer periphery of the spring receiver 18, a weight support member 23 is attached with a rivet 22 at an inner peripheral flange 23a at one end thereof. 22. It is fixed by... The weight support member 23 has a cylindrical ring portion 23b that extends concentrically from the spring receiver 18 toward the movable shaver 7 at a predetermined distance from the drive shaft 3.
The other end has an outer peripheral flange portion 23c extending radially outward.
are arranged in series, and a plurality of locations on the outer periphery of the flange portion 23c are partially inclined in a direction radially outward and away from the movable shaver, and the movable shaver 7 at the inclined portion
A support surface 23d is formed on the opposite side (lower side in the figure).

Further, a ring-shaped spring retainer 24 is integrally joined to the outer periphery of the boss portion 7a of the movable shave 7, and a ring portion 23b of the weight support member 23 is provided between the spring retainer 24 and the spring receiver 18. A driving spring 25 located on the circumferential side is compressed, and the spring force of this driving spring 25 urges the movable shaver 7 in a direction toward the fixed shaver 6 (upward in the figure).

The outer peripheral edge of the movable shaver 7 extends in a ring shape on the opposite side from the fixed shaver 6 in parallel with the drive shaft 3, and a ring-shaped engagement member 26 is provided with rivets 27, 27 on the inner periphery of the extended portion.
．． It is integrally fixed by... This engaging member 26 is formed with a plurality of engaging parts 26a, 26a, . Locking pads 28 attached to the outer peripheral edge of the outer peripheral flange portion 23c of the weight support member 23 other than the inclined portion are respectively engaged with the joint portions 26a. That is, the boss portion 7a of the movable shaver 7 on the drive pulley 5 is rotatably supported by the drive shaft 3, and the movable shaver 7 engages the engagement member 26 and the engagement member 26 on the radially outer side of the drive spring 25 with respect to the drive shaft 3. Stop pad 28, 28. . . . Rotationally engaged via the weight support member 23 and the spring receiver 18.

The engaging member 26 also includes the weight supporting member 2.
A cam drum 31 that slides on the outer periphery of the ring portion 23b of No. 3 through a sealing gasket 29 is integrally attached at its outer periphery with a mounting bolt 30. A portion of the cam drum 31 corresponding to the support surface 23d of the weight support member 23 is inclined toward the outside in the radial direction toward the support surface 23d (movable shave 7),
A cam surface 31a that is inclined in a direction toward the movable shaver 7 toward the outside in the radial direction is formed at a portion of the inclined portion facing the support surface 23d.

Further, between each support surface 23d of the weight support member 23 and each cam surface 31a of the cam drum 31, a centrifugal weight 32 consisting of a roller having a predetermined mass is held so as to be rotatable in the radial direction. The centrifugal force generated by the rotation of the crankshaft 1 causes each centrifugal weight 32 to
is moved radially outward of the drive shaft 3 and the centrifugal weight 32 presses the cam surface 31a, thereby separating the movable shaver 7 from the fixed shaver 6 against the biasing force of the drive spring 25. It is done like this.

Further, the cam drum 31 that moves in the axial direction integrally with the movable shaver 7 is provided with a through-hole screw hole 33 extending parallel to the drive shaft 3 in a portion other than each cam member 31a, although not shown. When a bolt rotatably but not axially movably engaged with a fixing jig on the back side of the movable shaver 7 is screwed into the screw hole 33, the bolt becomes movable. By pulling the shaver 7 away from the fixed shaver 6 against the biasing force of the drive spring 25, the belt groove 8 of the drive pulley 5 is opened.

On the other hand, a flange-shaped engagement member 35 is attached to the boss portion 11a of the movable shaver 11 of the driven pulley 9.
4,34. The engaging member 35 has a plurality of locking pads 36 arranged at equal intervals on the outer periphery of the engaging member 35.
36. ... (only one is shown) are integrally attached.

Further, a flange portion 4b extending radially outward is integrally formed at the base end of the driven shaft 4. A ring-shaped spring retainer 37 is integrally joined to the outer periphery of the boss portion 11a of the movable shaver 11, and an inner portion of the engaging member 35 is disposed between the spring retainer 37 and the flange portion 4b of the driven shaft 4. A driven spring 38 located on the circumferential side is compressed, and the spring constant of the driven spring 38 is set lower than the spring constant of the drive spring 25,
Due to the spring force of this driven spring 38, the movable shave 1
1 in a direction approaching the fixed shave 10 (downward in the figure).

Further, the outer circumferential edge of the flange portion 4b of the driven shaft 4 is connected to a ring portion 4c extending parallel to the driven shaft 4, and the inner circumference of the ring portion 4C is partially provided with each locking member 35. Engaging portions 4d, 4d, . . . (only one is shown) that engage with the pad 36 are formed at equal angular intervals. Therefore, the boss portion 11a of the movable shaver 11 in the driven pulley 9 is rotatably supported by the driven shaft 4, and the movable shaver 11 engages the engagement member 35 and the engagement member 35 on the radially outer side of the driven shaft 4 with respect to the driven shaft 4. Stop pad 36.36
．． They are rotationally engaged through...

Further, a speed increasing pulley 39 consisting of a lever pulley is rotatably attached to the flange portion 4b of the driven shaft 4 by rivets 40, 40, . Reference numeral 41 is drive-coupled to the rotating shaft of a mechanical supercharger, which is not shown, but has a load characteristic in which the load torque decreases as the rotation increases.
9. The information is transmitted to the supercharger via the rib belt 41.

Furthermore, a through screw hole 42 having a center line parallel to the driven shaft 4 is formed in the boss portion 10a of the fixed shave 10 of the driven pulley 9, facing the boss portion 11a of the movable shave 11, as shown in the figure. No, but that screw hole 42
When a 1M bolt is screwed in, the tip of the bolt presses the movable sheave 11 away from the fixed sheave 10 against the biasing force of the driven spring 38, thereby causing the driven pulley 9 to move. The belt groove 12 is configured to open.

Next, the operation of the above embodiment will be explained.

When the engine is running, the rotation of the crank 1 is transmitted to the transmission A, and is transmitted from the drive pulley 5 on the drive shaft 3 to the driven pulley 9 on the driven shaft 4 (counter shaft 2) via the V-belt 17. The gears are changed during this time. This driven shaft 4
The rotation is transmitted to the supercharger via the speed-increasing pulley 39 and the rib belt 41 hooked around the pulley 39.

The transmission A has a centrifugal weight 32 on the driving side.
centrifugal force acting on the drive and driven springs 25.3
8 and the tension of the belt 17 are balanced. That is, when the engine speed is low, each centrifugal weight 32 on the drive pulley 5 is pushed by the cam surface 31a of the cam drum 31 and is radially inward due to the biasing force of the drive spring 25, and the movable shaver 7 is pushed against the fixed shaver 6. The pulley diameter of the driving pulley 5 increases as a result. On the other hand, in the driven pulley 9, as the pulley diameter of the drive pulley 5 increases, the belt 17 is drawn toward the drive pulley 5, so the tension of the belt 17 causes the movable shaver 11 to move away from the fixed shaver 10. However, due to this movement, the pulley diameter of the driven pulley 9 is reduced. As a result, the pulley diameter of the driving pulley 5 becomes larger than that of the driven pulley 9, so that the rotation of the engine is increased in speed and transmitted to the supercharger.

On the other hand, when the engine speed increases, each centrifugal weight 3 on the drive pulley 5 side
Since the centrifugal force acting on 2 increases, the centrifugal weight 3
2 rolls radially outward along the support surface 23d of the weight support member 23.

As the centrifugal weight 32 rolls, the cam surface 31a that holds the weight 32 between it and the support surface 23d is pressed, and the cam drum 31 is pushed downward in the figure, causing the movement of the cam drum 31 to be integral with the cam drum 31. The shaver 7 slides downward against the biasing force of the drive spring 25 and away from the fixed shaver 6, thereby reducing the radius of the drive pulley 5.

Furthermore, on the driven pulley 9 side, as the pulley diameter of the driving pulley 5 decreases, the tension of the belt 17 decreases, so the biasing force of the driven spring 38 causes the movable shaver 11 to
slides downwards in the figure and approaches the fixed shaver 10, whereby the radius of the driven boob I79 increases correspondingly to the decrease in the radius of the drive pulley 5. As a result, the gear ratio between the driving and driven shafts 3.4 changes from the speed increasing state to the constant speed state and then to the decelerating state.

In this case, as the engine speed increases, the speed of the supercharger on the driven side decreases, and the movable shaver 11 in the driven pulley 9 approaches the fixed shaver 10, the driven spring 38 expands, and the belt 17 The overthrust is small (and this decrease in overthrust reduces the torque transmitted to the supercharger. In other words, the load characteristics of a mechanical supercharger have the characteristic that the load torque decreases as the engine speed increases. The output torque characteristics of the transmission correspond accurately to the output torque characteristics of the transmission, thereby improving the operating efficiency of the supercharger.

Also, the boss portion 7 of the movable shaver 7 in the drive pulley 5
a is rotatably supported on the drive shaft 3, and the movable shave 7
is rotatably engaged with the drive shaft 3 at a radially outer side than the drive spring 25, and since the torque transmission portion between the drive shaft 3 and the movable shaver 7 is located radially outward, the A large area of the transmission torque transfer surface can be ensured, and as a result, wear and damage to the torque transmission portion between the drive shaft 3 and the drive boob 95 can be suppressed. Moreover, the driven pulley 9 has a similar structure, and the torque transmission portion between the driven shaft 4 and the movable shaver 11 is connected to the driven spring 3.
8, it is possible to secure a large area of the transmission torque transmission/reception surface between the two, thereby reducing wear and damage to the torque transmission portion between the driven shaft 4 and the driven pulley 9. can.

Furthermore, since the spring constant of the drive spring 25 is set higher than the spring constant of the driven spring 38, the three types of thrust caused by the tension of each centrifugal weight 32, the drive and driven springs 25, 38, and the belt 17 are balanced. Even if the tension of the belt 17 changes due to load fluctuations,
The amount of displacement of the drive spring 25 having a large spring constant is small, and it is possible to suppress fluctuations in the gear ratio and maintain stable rotation of the supercharger. Moreover, due to the drive spring 25 having a large spring constant, even if the engine speed changes, the movable shaver 7 of the drive pulley 5 quickly moves to a position corresponding to the changed rotation speed, and the reaction is fast.
The pulley diameter of the driven pulley 9 also changes smoothly, making it possible to suppress hunting during gear shifting, and to change the rotational change of the driven pulley 9 caused by the decrease in the rotation of the drive pulley 5 in a decelerating state from that during speeding up. Assuming that they are substantially the same, hysteresis in both states can be suppressed.

Also, since the spring receiver 18 of the drive pulley 5 is fastened and fixed to the drive shaft 3 by a push screw 19, and the fixed shave 10 of the driven pulley 9 is fastened and fixed to the driven shaft 4 by a push screw 13, the transmission device A is connected to the engine. The belt 17 can be easily replaced even when the distance between the drive shaft 3 and the driven shaft 4 cannot be changed. That is, when assembling the drive pulley 5 side, the fixed shave 6 of the drive pulley 5 is first press-fitted onto the drive shaft 3, and then the movable shave 7 is attached to the drive spring 25, spring receiver 18, weight support member 23, and each centrifugal weight. 32, etc., and fasten the spring receiver 18 to the drive shaft 3 against the biasing force of the drive spring 25 by screwing the push screw 19 into the drive shaft threaded portion 3C, and then tighten the mounting bolt 21 to the engine crank. The drive pulley 5 side is assembled by screwing into the screw hole 1a of the shaft 1. On the other hand, when assembling the driven pulley 9 side,
With respect to the driven shaft 4, first, the movable shaver 1 of the driven pulley 9
1 is fitted together with the driven spring 38, the engaging member 35, etc., and then the fixed shave 10 is fastened to the driven shaft 4 against the biasing force of the driven spring 38 by screwing into the driven shaft threaded portion 4e of the pressing screw 13. After that, the driven pulley 9 side is assembled by screwing the mounting bolt 15 into the screw hole 2a of the counter shaft 2. Thus the pressing screw 19.13
the center hole threaded portions 3c of the drive shaft 3 and driven shaft 4, respectively;
4e, the driving and driven pulleys 5, 9
can be assembled against the urging force of the driving and driven pulleys 25.38, so there is no need for a hydraulic press device or jig to compress the springs 25.38 from their free lengths, and the driving and driven pulleys 5 , 9 can be easily assembled.

For this reason, when replacing the belt 17, for example, the mounting bolt 15 on the driven pulley 9 side and the pressing screw 13
After loosening and removing the fixed shave 10 and replacing the belt 17, the tip of the pressing screw 13 that has inserted and supported the fixed shave 10 is screwed into the center hole threaded portion 4e of the driven shaft 4, and then the pressing screw 13, the fixed shave 10 can be assembled in the correct position against the biasing force of the driven spring 38, and after assembly, the mounting bolt 15
may be screwed into the screw hole 2a of the counter shaft 2. Therefore, there is no need to remove the driven pulley 9 itself from the counter shaft 2, and the belt 17 can be replaced easily. Further, instead of the fixed shave 10 of the driven pulley 9, the spring receiver 18 on the driving pulley 5 side may be removed by the pressing screw 19 and the mounting bolt 21, and the belt can be replaced easily in the same way.

Furthermore, at this time, the fixed shave 10 of the driven pulley 9 and the spring receiver 18 on the drive pulley 5 side are held between the pressing screws 19 and 13 that are screwed into the center hole threaded portions 3c and 4e of the drive shaft 3 and the driven shaft 4. , in view of the rock-loading properties of the belt 17, when the driving and driven springs 25 and 38 are at substantially free lengths, the tips of the driving shafts 3 and the driven shafts 4 are screwed into threaded portions 3c and 4.
Although the entire length of the pressing screws 19, 13 is made longer so that they can be screwed into the drive shaft 3 and the driven shaft 4, Therefore, the size of the transmission A can be made compact.

Further, the fixed shaver 10 and the spring receiver 18 are fastened and fixed to the drive shaft 3 and the driven shaft 4 by pressing screws 19 and 13, respectively, so that the drive and driven pulleys 3 and 4 are connected to the engine crankshaft 1 and the countershaft 2, respectively. Even when not attached, the fixed shave 10 and the spring receiver 18 can be integrally attached to the drive shaft 3 and the driven shaft 4 together with other parts to form a unit, preventing each part from becoming separated and allowing the pulley 3 .4 handling operability can be improved.

In addition, the drive pulley 5 is attached to the drive shaft 3, and the driven pulley 9 is attached to the drive shaft 3.
When assembling the belt 17 by separating the movable shavers 7 and 11 from the fixed shavers 6° 10 and opening the pulleys 5 and 9 with each movable shaver 7 and 11 assembled on the driven shaft 4, the following two steps This method allows the pulleys 5 and 9 to be opened easily.

That is, in the method (2), a bolt is screwed into the screw hole 42 of the fixed shave 10 in the driven pulley 9. As this bolt threads, its tip ends up in the screw hole 42.
abuts against the boss portion 11a of the movable shave 11 facing the
Thereafter, when the bolt is screwed further, the movable shaver 11 separates from the fixed shaver 10 while compressing the driven spring 38, thereby opening the driven pulley 9. A jig is fixed to the back side of the movable shaver 7, a bolt is engaged with the jig so that it can rotate but not move in the axial direction, and the tip of the bolt is screwed into the screw hole 33 of the cam drum 31. The screw movement of this bolt in the screw hole 33 causes the bolt and the cam drum 31 to move relative to each other, and this relative movement causes the cam drum 31 to move toward the jig side (lower side in the figure) against the biasing force of the drive spring 25. The cam drum 31
The movable shaver 7, which is integral with the movable shaver 7, moves away from the fixed shaver 6, thereby allowing the drive pulley 5 to be opened. In this way, the driving or driven pulley 5,
9 is open, it becomes easy to insert the belt 17 between both pulleys 5.9, so even though the distance between the drive shaft 3 and the driven shaft 4 cannot be changed, the belt 17 can be easily inserted between the pulleys 5.9. Mounting and assembly of the transmission A to the engine can be done in a compact manner.

In the above embodiment, the centrifugal weight 32 and the drive spring 25 were provided on the drive side, and the driven spring 38 was provided on the driven side, but the present invention is not limited to such an arrangement. It may be placed on the driven side. It is also possible to separately arrange a centrifugal weight on the driving side and a spring on the driven side, or conversely, to arrange a centrifugal weight on the driven side and a spring on the driving side.

Further, in the above embodiment, the present invention is applied to an automatic transmission that changes gears so that the gear ratio decreases by 1f as the rotation of the drive shaft 3 increases. It can also be applied to a belt-type automatic transmission that changes gears so that the gear ratio increases as the number increases.

Furthermore, in the above embodiment, the transmission device A is interposed in the power transmission system from the crankshaft 1 of the engine to the mechanical supercharger.
However, the present invention can also be applied to auxiliary drive systems such as engine water pumps, wheel drive systems of two-wheeled vehicles or various types of transporters, and the like.

(Effects of the Invention) As described above, according to the invention described in claims (1) and (2), a pair of rotating shafts is provided with a driving pulley and a driven pulley each consisting of a variable pulley, so that the rotation of the rotating shaft is controlled by l' T! By pressing the cam surface of the cam member with a centrifugal weight that rolls radially outward of the rotating shaft and moving the movable shave of the driving or driven pulley toward and away from the fixed shave, the rotation between the two rotating shafts is controlled. In a pulley-type automatic transmission device that changes speed, the rotating shaft has a cylindrical shape with a center hole and a threaded portion at one end, and a threaded member is screwed into the threaded portion of the rotating shaft to connect the flange portion and the rotating shaft. By sandwiching the fixed shave of the pulley or the spring receiver between the end of the belt and inserting the bolt through each center hole of the threaded member and rotating shaft, the belt is screwed onto the end surface of the mounting shaft, making it easy to replace the belt. When doing so, there is no need to attach or detach the pulley from the mounting shaft.
The belt can be replaced by removing the fixed shave or spring receiver, making it easy to replace the belt. Furthermore, when attaching the fixed shave or spring receiver after replacing the belt, the spring can be automatically tightened by simply screwing the tip of the threaded member into the threaded part of the center hole of the rotating shaft while the spring has a substantially free length and its urging force is small. The fixed shave or spring receiver can be fixed while being compressed, and the fixed shave or spring receiver can be easily inserted and removed. Furthermore, since the fixed shave or spring receiver is held between the threaded member that is screwed into the center hole threaded part of the rotating shaft, the overall length of the rotating shaft can be shortened by the amount that the threaded member is inserted into the rotating shaft, making it easier to change speeds. The device can be kept compact.

Also, since the fixed shave or spring receiver is fastened and fixed to the rotating shaft by a screw member, the fixed shave or spring receiver can be integrally mounted to the rotating shaft with other parts without the driving or driven pulley being attached to the mounting shaft. It can be made into a unit, improving the handling and operability of the pulley.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an automatic transmission according to an embodiment of the present invention. A...Transmission device, 3... Drive shaft (drive side rotating shaft),
3a... Center hole, 3C... Threaded portion, 4... Driven shaft (driven side rotating shaft), 4a... Center hole, 4e... Threaded portion, 5... Drive pulley, 6...・Fixed shave, 7・
... Movable shave, 7a... Boss portion, 8... Belt groove, 9... Driven pulley, 10... Fixed shave, 1
1... Movable shave, 1, 1 a... Boss part, 12
... Belt groove, 13 ... Pressing screw (screw member), 1
3a...flange part, 13b...center hole, 15...
・Mounting bolt, 17... V-belt, 18... Spring receiver, 19... Pressing screw member), 19a.
...Flange part, 19b...Center hole, 21...Mounting bolt, 23...Weight support part key, 23d...
Supporting surface, 25... Drive spring, 26... Engaging member, 28... Locking pad, 31... Cam drum (cam member), 31a... Cam surface, 32... Centrifugal weight, 33°42...screw hole, 35...engaging member, 3
6...Latching pad, 38...Followed spring.

Claims (2)

[Claims] (1) A fixed shave that is non-slidably and rotatably fixed to the drive side rotating shaft, and a belt groove is formed between the fixed shave that is rotatably and slidably supported on the drive side rotating shaft. a drive pulley consisting of a movable shaver, a fixed shave that is non-slidably and rotatably fixed to a driven rotating shaft parallel to the driving rotating shaft, and the fixed shave to the driven rotating shaft. a driven pulley consisting of a movable shave that is rotatably and slidably supported so as to form a belt groove on the drive pulley; a belt hung between each belt groove of the drive and driven pulleys; and a drive or driven pulley. a cam member that is connected to the rear side of at least one of the movable shavers so as to be movable in the axial direction and has a cam surface that is inclined in a predetermined direction toward the outside in the radial direction; The cam surface of the cam member is pressed by the centrifugal weight that is rotatably provided on the outside in the radial direction of the rotating shaft, and the centrifugal weight that rolls on the outside in the radial direction of the rotating shaft as the rotating shaft rotates. By moving the movable shave towards and away from the fixed shave,
In a pulley-type automatic transmission device that changes rotation speed between both rotating shafts, a spring receiver disposed on the back side of the movable shaver of at least one of the driving or driven pulleys, and a spring receiver between the spring receiver and the movable shaver. A compressed spring is provided to bias the movable shaver in a direction toward the fixed shaver side, and at least one of the driving side or driven side rotating shaft is provided in a cylindrical shape having a center hole into which a mounting shaft can be fitted. A threaded portion is formed on the inner surface of one end of the center hole, and a ring-shaped threaded member having a flange portion and a center hole is screwed into the threaded portion, and the flange portion of the threaded member and the end face of the rotating shaft are screwed together. A centrifugal weight characterized in that the fixed shave is supported under pressure between the screw member and the rotating shaft, and a bolt is inserted through each center hole of the screw member and the rotating shaft and is screwed and fastened to the end face of the mounting shaft. Equipped with belt type automatic transmission. (2) A fixed shave that is non-slidably and rotatably fixed to the drive-side rotating shaft and a belt groove that is rotatably and slidably fixed to the drive-side rotating shaft so that a belt groove is formed between the fixed shave a drive pulley consisting of a supported movable shave; a fixed shave fixed to a driven rotating shaft parallel to the driving rotating shaft in a non-slidable and rotatable manner; and a fixed shave to the driven rotating shaft. a driven pulley consisting of a movable shaver rotatably and slidably supported so as to form a belt groove therebetween; a belt placed between each belt groove of the drive and driven pulleys; and a drive or driven pulley. A cam member that is connected to the rear side of at least one movable shaver of the pulley so as to be movable in the axial direction and has a cam surface that is inclined in a predetermined direction toward the outside in the radial direction, and on the cam surface of the cam member. and a centrifugal weight that is rotatably provided on the outside in the radial direction of the rotating shaft, and the cam surface of the cam member is pressed by the centrifugal weight that rolls on the outside in the radial direction of the rotating shaft as the rotating shaft rotates. By moving the movable shaver toward and away from the fixed shaver,
In a pulley-type automatic transmission device that changes rotation speed between both rotating shafts, a spring receiver disposed on the back side of the movable shaver of at least one of the driving or driven pulleys, and a spring receiver between the spring receiver and the movable shaver. A compressed spring is provided to bias the movable shaver in a direction toward the fixed shaver side, and at least one of the driving side or driven side rotating shaft is provided in a cylindrical shape having a center hole into which a mounting shaft can be fitted. A threaded portion is formed on the inner surface of one end of the center hole, and a ring-shaped threaded member having a flange portion and a center hole is screwed into the threaded portion, and the flange portion of the threaded member and the end face of the rotating shaft are screwed together. The centrifugal weight is characterized in that the spring receiver is supported under pressure between the screw member and the rotating shaft, and a bolt is inserted through each center hole of the threaded member and the rotating shaft and is screwed and fastened to the end surface of the mounting shaft. Equipped with belt type automatic transmission.