JPH02180344A - Belt type continuous transmission with centrifugal weight - Google Patents

Abstract

PURPOSE:To facilitate belt setting on pulleys by separating a movable sheave from a stationary sheave against the energization force of a spring through utilization of a threaded member, and providing a variable pulley with a belt groove which can be opened easily. CONSTITUTION:A bolt 47 is driven into a threaded hole 42 of a stationary sheave 10 to a follower pulley 9. With screwing motion of this bolt 47, the tip comes in contact with a boss 11a on a movable sheave 11 facing the threaded hole 42, and further driving of the bolt 47 causes the movable sheave 11 to move apart from the stationary sheave 10 while compressing a follower spring 38, and a follower pulley 9 is opened. A jig 45 is fixed to the movable shave 7 rear face side in a drive pulley 5, and a bolt 46 is put in detection therewith rotatably but not movably in the axial direction, and with this condition held, the tip of this bolt 46 is driven into a threaded hole 33 in a cam drum 31. With screwing motion of bolt 46 in the threaded hole 33, the movable sheave 7 in a single piece with the cam drum 31 moves in the direction apart from the stationary sheave 6, and thus the pulley 5 is opened.

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. The centrifugal weight is equipped with a spring biased in a direction approaching the cam surface, and a centrifugal weight held between the cam surface and the support surface so as to be able to roll in the radial direction. By rolling in the radial direction of 16 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. It is something.

(Problems to be Solved by the Invention) By the way, when a belt-type automatic transmission device that uses centrifugal weights as described above is incorporated into a machine to which it is applied,
To shorten the distance between the rotating shafts on the drive side and driven side of the transmission to shorten the so-called distance between the shafts, and in that state, install a belt between the belt grooves of each variable pulley, and then widen the distance between the shafts. When this is possible, the belt enters the belt groove while expanding the belt groove against the biasing force of the subring, which pushes the movable shaver toward the fixed shaver and biases the pulley in the closing direction. The transmission can be easily installed on the machine.

However, when installing the belt into a machine in which the distance between the shafts cannot be reduced, it is necessary to open the pulley and insert the belt before installing the belt.

In this way, as a method to open the pulley and insert the belt,
Normally, there are two methods: ■ Inserting a wedge between the fixed and movable shuv on the variable pulley to spread the pulley, and inserting the belt in that state, ■ Driving the belt directly into the belt groove with a hammer, and ■ Pulling out the pulley. The method used is to forcibly pull the movable shaver using a so-called jig to open the pulley, and then insert the belt into the pulley. However, these methods may cause deformation of the shaver or damage to the belt.

The present invention has been made in view of the above, and its purpose is to improve the structure of the fixed or movable shave in the variable pulley, and to make it movable against the biasing force of the spring by using threaded members such as bolts. The object of the present invention is to separate the shaver from the fixed shaver so that the belt groove of the variable pulley can be easily opened, thereby making it easier to insert the belt into the pulley.

(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-slidable and rotatable manner, and a fixed shave to the driven rotation shaft. a driven pulley consisting of a movable shaver which is rotatably and movably supported so as to form a belt groove therebetween, a belt hung between each belt groove of the driving and driven pulleys, and the driving or driven pulley. a force member having a cam surface that is integrally movable in the axial direction with the movable shaver on the rear side of at least one of the movable shavers and that is inclined radially outward in a predetermined direction; and a cam surface of the cam member. The cam surface of the cam member is pressed 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 is provided that biases at least one movable shave of the driving or driven pulley in a direction toward the fixed shave.

Furthermore, a through-hole screw hole extending parallel to the rotating shaft is formed in the fixed shave of the pulley on the side where the spring is installed, facing the movable shave, and a screw such as a bolt is screwed into the screw hole. When the member is screwed, the tip of the screw member presses the movable shaver in a direction away from the fixed shaver against the biasing force of the spring, so that the pulley opens.

Further, in the invention as claimed in claim (2), in the above-mentioned pulley type automatic transmission, a spring is provided for biasing the +71 dynamic sheave of at least one of the driving pulley or the driven pulley in a direction toward the fixed sheave side. , the movable shave of the pulley on the side where the spring is provided, or a member that moves in the axial direction integrally with the movable shave, has a rotary shaft and "
A through-shaped screw hole is formed that extends from I' jr L, and a screw member that is rotatably but immovably engaged in the axial direction is screwed into the screw hole. 1. When screwed, the screw member pulls the movable shaver away from the fixed shaver against the biasing force of the spring, so that the pulley opens. +4 achieved.

(Function) With the above configuration, in the invention as claimed in claim (1), when the belt groove of the pulley is opened and the belt is inserted, a threaded member such as a bolt is inserted into the threaded hole in the fixed shaver with its tip facing toward the movable shaver. If you screw it together toward the
As the screw member spirals, its tip presses the movable shaver against the biasing force of the spring and separates it from the fixed shaver. This opens the belt groove of the pulley, allowing the belt to be inserted into the belt groove.

In addition, in the invention described in claim (2), the screw member is previously engaged with the fixing jig on the back side of the movable shaver so as to be rotatable and immovable in the axial direction. Or, when the screw member is screwed into a penetrating screw hole in a member that moves in the axial direction together with the movable shaver, the screw member resists the biasing force of the spring as the screw member screws. Pull the movable shave away from the fixed shave. This opens the belt groove of the pulley, so the belt can be inserted into the belt groove.

Therefore, in these inventions, as described above, since the movable shave of the pulley is separated from the fixed shave using the screw movement of the threaded member, the simple structure of fixing the pulley or forming a screw hole in the movable shave is sufficient. , the pulley can be easily expanded, and the belt will not be damaged or the shaved deformed.

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

Figure TS1 shows the overall configuration of a belt type automatic transmission A according to an embodiment of the present invention. 1 is a crankshaft of an automobile engine (not shown); 2 is a countershaft disposed parallel to the side of the crankshaft 1 and rotatably supported by a cylinder block or the like of the engine; 1 and the counter shaft 2 have a screw hole 1 in their center on their tip surfaces.
a, 2a are formed.

Reference numeral 3 denotes a cylindrical drive shaft as a drive-side rotation shaft having a center hole 3a, and a large-diameter portion 3b having a larger diameter than other portions is formed at its base end (upper end in the figure). By press-fitting the tip of the crankshaft 1 into the large diameter portion 3b, the drive shaft 3 is attached concentrically to the crankshaft 1 so as to rotate integrally therewith. Reference numeral 4 denotes a substantially cylindrical driven shaft as a driven side rotating shaft disposed parallel to the drive shaft 3, and the center hole 4a of the driven shaft 4 has its base end (upper end in the figure).
The above-mentioned counter shaft 2 is press-fitted from .
With this structure, the driven shaft 4 is concentrically attached to the counter shaft 2 so as to rotate integrally therewith.

A drive pulley 5 is provided on the drive shaft 3 and is composed of a variable pulley consisting of flange-shaped fixed and movable shaves 6 and 7.
The engine crankshaft 1 side end) is press-fitted to rotate integrally and non-slidably. Further, the movable shaver 7 is slidably supported on the drive shaft 3 at the boss portion 7a via a sealing gasket 43.43 so as to face the fixed shaver 6, and between these two shavers 6.7. A belt groove 8 having a cross section shaped like a square is formed in the belt.

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 having a flange portion 13a at one end is screwed into the front end side of the center hole 4a of the driven shaft 4.
A parallel pin 14 connects the driven shaft 4 to the tip of the driven shaft 4.
Hold the boss portion 10a of the fixed shave 10 engaged with the screw 1 and press the mounting bolt 15 made of a hexagonal bolt.
3 and the center hole 4a of the driven shaft 4 and is screwed into the tip screw hole 2a of the counter shaft 2, whereby the fixed shave 10 is fixed to the driven shaft 4 in a rotationally integral manner and non-slidably. . 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 defining shaver 6 on the driving pulley 5. These shavers 10 and 11 each have a belt groove 1 with a V-shaped cross section.
2 is formed.

The belt groove 8 of the driving and driven pulleys 5 and 9,
A V-belt 17 is wound between the pulleys 5 and 12, and the movable shaves 7 and 11 of both pulleys 5 and 9 are moved toward and away from the fixed shaves 6 and 10 in opposite directions. The diameter of the pulley 9 (effective radius for the V-belt 17) is variably adjusted. For example, drive pulley 5
When the movable shave 7 of the driven pulley 9 is brought closer to the fixed shave 6 to increase the pulley diameter of the drive pulley 5, the V-belt 17 moves toward the drive pulley 5 side, thereby moving the movable shave 11 of the driven pulley 9 closer to the fixed shave 10. By making the pulley diameter of the driven pulley 9 smaller than that of the driving pulley 5, the speed change ratio between both shafts 3.4 is increased to achieve a speed increasing state.

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 is screwed into one end of the center hole 3a of the drive shaft 3, and the flange portion 19a is connected to the other end of the driving shaft 3. In between, the spring receiver 18 engaged with the drive shaft 3 is held by the parallel pin 20, and the mounting bolt 2), which is a hexagonal bolt, is pressed between the screw 19 and the center hole 3 of the drive shaft 3.
The spring receiver 18 is fixed to the drive shaft 3 in a rotationally integral manner and non-slidably by being screwed into the screw hole 1a of the crankshaft 1 through the spring receiver 1a.

A weight support member 23 is attached to the outer periphery of the spring receiver 18 with rivets 22, 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. An outer circumferential flange portion 23c extending outward is provided, and a plurality of locations on the outer circumference of the flange portion 23c are partially inclined in a direction radially outward and away from the movable shaver, and the movable shaver 7 and the movable shaver 7 at the inclined portions are inclined. A support surface 23d is formed on the opposite surface (lower surface 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 parallel to the drive shaft 3 on the side opposite to the fixed shaver 6, and a ring-shaped engagement portion A26 is provided on the inner periphery of the extended portion with rivets 27, 2.
7. It is integrally fixed by... This engaging portion +426 is formed with a plurality of engaging portions 26a, 26a, . Engaging IL pads 28 attached to the outer periphery of the outer flange portion 23 of the weight support member 23 (other than the inclined portion) are respectively engaged with the mating portions 26a. That is, the bosses of the movable shave 7 on the drive pulley 5 The portion 7a is rotatably supported by the drive shaft 3, and the movable shaver 7 has an engaging member 26, locking pads 28, 28, . They are rotatably engaged via the member 23 and the spring receiver 18.

The engaging member 26 also includes the weight supporting member 2.
The outer periphery of the ring portion 23b of No. 3 is integrally attached to the cam drum 31, which moves by 1f1, via a sealing gasket 29, by a mounting bolt 30 at its outer periphery. A portion of the cam drum 31 that corresponds to the support surface 23d of the weight support member 23 is inclined toward the outer support surface 23d (movable shaver 7) in the radial direction. A cam surface 31a that is inclined toward the movable shaver 7 toward the outside in the radial direction is formed on the opposing portion.

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, so that the movable shave 7 is separated from the fixed shave 6 against the biasing force of the drive spring 25. being done.

Further, as a feature of the present invention, the cam drum 31, which is a member that moves in the axial direction integrally with the movable shaver 7, has a through screw hole 33 extending parallel to the drive shaft 3 in a portion other than each cam surface 31a. As shown by the imaginary line in the figure, a screw member as a screw member is engaged in the screw hole 33 of the fixing jig 45 on the back side of the movable shaver 7 so as to be rotatable and immovable in the axial direction. When the bolts 4 and 6 are screwed in, the bolts 46 pull the movable shaver 7 away from the fixed shaver 6 against the biasing force of the drive spring 25, thereby tightening the belt of the drive pulley 5. The groove 8 is configured to be open.

On the other hand, a flange-shaped engagement member 35 is attached to the boss portion 11a of the movable shaver 11 in the driven boob 99 with the rivet 3.
4,34. . . , and a plurality of locking pads 36 .
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 outside of the driven shaft 4 in the radial direction than the driven spring 38. Stop pad 36.3
6. 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 a driven machine having a load characteristic in which the load torque decreases as the rotation increases, although not shown.
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 11g of the movable shave 11. As shown by the phantom lines in FIG. By pressing against the urging force of , the belt groove 12 of the driven pulley 9 is opened.

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

When the engine is running, the rotation of the crankshaft 1 is transmitted to the transmission A, and from the drive pulley 5 on the drive shaft °3 to the V
It is transmitted to the driven pulley 9 on the driven shaft 4 (counter shaft 2) via the belt 17, and the speed is changed during that time. The rotation of the driven shaft 4 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. As a result, the pulley diameter of the drive pulley 5 increases. 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 accelerated 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 pulley 9 increases correspondingly to the decrease in the radius of said 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 This decrease in overthrust reduces the transmission torque to the supercharger. In other words, the output torque characteristics of the transmission accurately correspond to the load characteristics of a mechanical supercharger, which has a characteristic that the load torque decreases as the engine speed increases, thereby improving the operating efficiency of the supercharger. be able to.

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 pulley 5 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, suppressing fluctuations in the gear ratio and stably maintaining the 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 the position corresponding to the changed speed, and the reaction is fast, so the driven The pulley diameter of the pulley 9 also changes smoothly, making it possible to suppress hunting during gear changes, and to change the rotation of the driven pulley 9 due to a decrease in the rotation of the drive pulley 5 in a decelerating state to be referred to as a speed increase. Assuming the same, hysteresis in both states can be suppressed.

In addition, since the drive pulley 5 is fastened and fixed to the drive shaft 3 by the mounting bolt 2), and the driven pulley 9 is fastened and fixed to the driven shaft 4 by the mounting bolt 15, the assembly work of the transmission A and the engine The belt 17 can be easily replaced while the belt 17 is attached to the belt. That is, when assembling the drive pulley 5 side, first press fit the fixed shave 6 of the drive pulley 5 onto the drive shaft 3,
Next, the movable shaver 7 is connected to the drive spring 25, the spring receiver 18, the weight support member 23, and each centrifugal weight 3.
After the spring receiver 18 is fastened to the drive shaft 3 against the biasing force of the drive spring 25 by screwing the push screw 19, the mounting bolt 2) is inserted into the screw hole 1a of the engine crankshaft 1. By screwing and tightening the drive pulley 5 (Ill), on the other hand, when assembling the driven pulley 9 side,
First, the movable shave 11 of the driven pulley 9 is fitted together with the driven spring 38, the engaging member 35, etc., and then the fixed shave 10 is fitted with the driven spring 3 by screwing the pressing screw 13.
After fastening to the driven shaft 4 against the urging force of 8, the driven pulley 9 side is assembled by screwing and fastening the mounting bolt 15 into the screw hole 2a of the counter 1+112. In this way, the mounting bolts 2) and 15 are inserted into the screw holes 1a of the crankshaft 1 and countershaft 2.

Just by screwing into 2a, the drive and driven pulleys 5.9
can be assembled against the biasing force of the driving and driven springs 25.38, so there is no need for a press device or jig to compress the springs 25.38 from their free length, and the assembly of the transmission A is simplified. It can be done easily.

On the other hand, when replacing the belt 17, in particular, loosen the mounting bolt 15 on the driven pulley 9 side, remove the fixed shape 10, replace the belt 17, and then insert and support the fixed shape 10 at the tip of the mounting bolt 15. into the screw hole 2a of the counter shaft 2, and then tighten the mounting bolt 15.
It becomes possible to assemble the stationary shaver 10 in the correct position against the biasing force of the driven spring 38 by simply screwing in the belt 17, thereby making it possible to easily replace the belt 17.

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 shaver 6° 10 and opening the pulley 5.9 with the movable shavers 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), the bolt 47 is screwed into the tapped hole 42 of the fixed shave 10 of the driven pulley 9. As this bolt 47 screws, its tip comes into contact with the boss portion 11a of the movable shaver 11 facing the screw hole 42, and then, when the bolt 47 is screwed further, i
The iJ movable shaver 11 moves away from the fixed shaver 10 while compressing the driven spring 38, thereby allowing the driven pulley 9 to open. In addition, in method (2), a jig 45 is fixed to the back side of the movable shaver 7 of the drive pulley 5, and the bolt 46 is engaged with the jig 45 so as to be rotatable but not movable in the axial direction. The tip of the bolt 46 is screwed into the screw hole 33 of the cam drum 31. The bolt 46 and the cam drum 31 move relative to each other due to the screw movement of the bolt 46 in the threaded hole 33, and this relative movement causes the cam drum 31 to move against the urging force of the drive spring 25 toward the jig 45 (lower side in the figure). , the movable shaver 7 integrated with the cam drum 31 moves in a direction away from the fixed shaver 6, thereby opening the drive pulley 5. When the drive or driven pulleys 5 and 9 are open in this way, it is easy to insert the belt 17 between the two pulleys 5 and 9, so that the so-called shaft between the drive shaft 3 and the driven shaft 4 can be easily inserted. Belt 17 even if the distance cannot be changed.
The piping of the engine and the assembly of the transmission A to the engine can be simplified.

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, the above embodiment is a case in which the present invention is applied to an automatic transmission device that changes gears so that the gear ratio becomes smaller as the rotation of the drive shaft 3 increases. The present invention can also be applied to a belt type automatic transmission that changes gears so that the gear ratio increases in response to an increase in speed.

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 set forth in claim (1), a driving pulley and a driven pulley each comprising a variable pulley are provided on a pair of rotating shafts, and as the rotating shafts rotate, the By pressing the cam surface of the cam member with a centrifugal weight that rolls outward in the radial direction and moving the movable shave of the driving or driven pulley toward and away from the fixed shave, the speed of rotation between the biconcave rolling shafts is changed. In the pulley type automatic transmission, a spring is provided that biases at least one movable shave of the driving or driven pulley in a direction toward the fixed shave,
A penetrating screw hole extending parallel to the rotation axis is formed in the fixed shave, and when a screw member screwed into the screw hole is screwed, the tip of the screw member resists the biasing force of the spring. The movable shaver is pushed away from the fixed shaver so that the pulley opens. ? When opening the belt and inserting the belt, the belt groove of the pulley can be opened in the container by simply screwing a threaded member such as a bolt into the threaded hole in the fixed shave and screwing it.

Further, according to the invention as set forth in claim (2), a spring is provided that biases at least one movable shave of the driving or driven pulley in the pulley type automatic transmission in a direction toward the fixed shave, and the movable shave or When a screw hole is formed in a member that moves in the axial direction together with the movable shaver, and a screw member engaged with a fixing jig on the back side of the movable shaver is screwed into the screw hole. The threaded member resists the biasing force of the spring and pulls the movable shaver away from the fixed shaver, opening the pulley, thereby causing the tip of the threaded member engaged with the fixing jig on the back side of the movable shaver to open. The belt groove of the pulley can be opened by simply inserting the screw into the screw hole and turning it.

Therefore, according to these inventions, it is possible to easily expand the pulley for inserting the belt with a simple structure and without causing damage to the belt or deformation of the shaver, and the distance between the two rotating shafts can be reduced. Even if the belt cannot be changed, it is possible to easily install the belt and assemble the transmission.

[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),
4... Driven shaft (driven side rotating shaft), 5... Drive pulley, 6... Fixed shave, 7... Movable shave, 7a
... Boss part, 8 ... Belt groove, 9 ... Driven pulley, 10 ... Fixed shave, 11 ... Movable shave,
lla...Boss part, 12...Belt groove, 17...
■Belt, 23... Weight support member, 23d...
Supporting surface, 25... Drive spring, 26... Engaging member, 28... Locking pad, 31... Cam drum (cam part +4'), 31a... Cam surface, 32... Centrifugal Weight, 33.42... Screw hole, 35... Engaging member, 36... Locking pad, 38... Followed spring,
45...Fixing jig, 46.47...Bolt (screw member). Patent applicant Band-Kagaku Co., Ltd. Patent applicant Mazda Motor Corporation), L.
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Claims (2)

[Claims] (1) 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 configured to change the speed of rotation of both rotating shafts, a spring is provided that biases at least one movable shave of the driving or driven pulley in a direction toward the fixed shave, and A penetrating screw hole extending parallel to the rotating shaft is formed opposite the movable shaver, and when the screw member screwed into the screw hole is screwed, the tip of the screw member touches the spring. A belt type automatic transmission device equipped with a centrifugal weight, characterized in that the belt groove of the pulley is opened by pressing the movable shaver in a direction away from the fixed shaver against the urging force of the belt type automatic transmission device. (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 configured to change the speed of rotation of both rotating shafts, a spring is provided that biases a movable shave of at least one of the drive or driven pulley in a direction toward a fixed shave, and the movable shave or A member that moves in the axial direction integrally with the movable shave has a through-hole screw hole extending parallel to the rotation axis, and a fixing jig on the back side of the movable shave can be rotatably attached to the screw hole. When the threaded member that is immovably engaged in the direction is screwed in, the threaded member resists the biasing force of the spring and pulls the movable shaver away from the fixed shaver, causing the belt of the pulley to A belt-type automatic transmission equipped with a centrifugal weight characterized in that the groove is configured to open.