JPH01255754A - Belt type automatic transmission equipped with centrifugal weight - Google Patents

Abstract

PURPOSE:To lighten weight by separating a cam member from a movable shave and also, conduct assemblage easily, by providing on the back surface side of the movable shave spring members which energize pressingly the cam member onto the movable shave side. CONSTITUTION:Spring members 18 which energize a cam member 19 pressingly onto the side of a movable shave are provided on the back surface side of the movable shave 6. A constitution is made so that the cam member 19 may be moved in one body against the movable shave 6 by the energizing force of these spring members 18. When the rotation number of a rotary shaft 2 rises up, a centrifugal weight 23 is rollingly moved onto the outside of a radius direction, and the cam surface of the cam member 19 is pushed pressingly, and sliding is done in the direction where the movable shave 6 in one body with the cam member 19 approaches a fixed shave 5, and the radius of a variable pulley changes and increases, and the ratio of transmission automatically changes.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a belt-type automatic transmission device that changes speed by changing the effective radius of a variable pulley in accordance with the centrifugal force accompanying rotation, and in particular, This relates to a device equipped with a centrifugal weight as a means for sensing force.

(Prior art) Conventional automatic transmissions equipped with four-, one-, and two centrifugal ways are disclosed in, for example, Japanese Patent Publication No. 62-24659 and Japanese Patent Publication No. 62-24659.
As shown in Japanese Patent Laid-open No. 58426 and Japanese Patent Application Laid-open No. 63-9762, there is a gap between a fixed shave that is non-slidably and rotationally fixed on a rotating shaft and the above-mentioned fixed shave on the rotating shaft. a variable pulley consisting of a movable shave that is rotatably and slidably supported so as to form a belt groove; a cam member disposed and having a tapered cam surface inclined in a predetermined direction;
A weight support member disposed on the back side of the movable shaver and having a support surface extending radially outward toward the cam surface, and a weight support member capable of rolling in the radial direction between the cam surface and the support surface. It is equipped with a sandwiched centrifugal weight, and the centrifugal weight is rolled in the radial direction by the change in centrifugal force accompanying the rotation of the rotating shaft, and the movable shaver is slid by the compression of the cam member against the cam surface. The speed is changed by changing the radius of the pulley.

By the way, this transmission device is employed in, for example, automobiles, two-wheeled vehicles, and various types of traveling transportation machines, and in that case, it is required to reduce the weight from the viewpoint of energy saving and the like.

Further, when the variable pulley is heavy, the load on the rotating shaft serving as its support shaft is large, and there is a risk that it may break.From this point of view as well, it is desirable to reduce the weight.

Therefore, in order to reduce the weight of the variable pulley, we focused on the fact that in the conventional pulley, the movable shaver is separate from the cam member, and we used a lightweight special alloy, SF6 material, etc. as the material for the movable shaver. By using lightweight materials, it is possible to reduce the weight of the movable shaver and, by extension, of the variable pulley as a whole.

(Problem to be Solved by the Invention) However, in this case, when attaching the cam member to the movable shaver so as to move it integrally in the axial direction, conventionally, the length of the movable shaver in the axial direction is increased. A method of fitting and fixing a cam member inside the movable shaver or a method of directly fastening and fixing the cam member to the movable shaver using bolts or the like are adopted, and it is inevitable that the mounting structure becomes complicated.

Since the cam surface on which the centrifugal weight rolls has a large effect on gear shifting performance, the cam member is replaced as appropriate, and it is also necessary to replace it when the cam surface wears out. The replacement work becomes troublesome.

In addition, especially in the former fitting method, since the length of the movable shaver in the axial direction becomes longer, an increase in the same amount is unavoidable, making it difficult to achieve thorough weight reduction.

The present invention has been made in view of the above points, and its purpose is to reduce the weight by separating the cam member and the movable shaver by improving the mounting structure of the above-mentioned cam member to the movable shaver. The objective is to achieve the following and to facilitate assembly.

(Means for Solving the Problem) To achieve this object, in the present invention, the cam member is pressed against the back surface of the movable waveform by the biasing force of a spring and fixed integrally therewith.

That is, the belt-type automatic transmission equipped with a centrifugal weight according to the present invention has a belt groove between a fixed shave that is fixed to the rotating shaft in a non-slidable and rotationally integral manner and the fixed shave on the rotating shaft. and a movable shaver rotatably and slidably supported to form a variable pulley. Further, a cam member is provided on the back side of the movable shaver, which is separate from the movable shaver and moves integrally with the movable shaver in the axial direction, and has a tapered cam surface that is inclined in a predetermined direction. and a centrifugal weight sandwiched between the cam surface and the support surface so as to be able to roll in the radial direction. Equipped with.

Then, the radius of the variable pulley is changed by rolling the centrifugal weight in the radial direction due to changes in centrifugal force accompanying the rotation of the rotating shaft, and sliding the movable shaver by pressing the cam member against the cam surface. It is configured to change gears.

Further, on the rear side of the movable shave, a spring member is provided that presses and biases the cam member toward the movable shave. It is configured to move and be fixed as one unit.

In order to prevent dust on the sliding part and to prevent slippage caused by lubricant on the belt member, the sliding part with the rotary shaft of the movable shaver is sealed between the inner circumferential opposing surfaces of the fixed and movable shavers facing the bottom of the belt groove. An extendable cover member may be installed. Further, an extendable cover member for sealing the sliding portion of the centrifugal way may be installed between the spring receiving member supporting the spring member and the cam member.

In addition, when attaching a fixed pulley to the rotary shaft that transmits its rotation to another shaft, in order to avoid an increase in the axial length due to the attachment of the pulley, the movable A fixed pulley having a rim portion of a predetermined width on its outer periphery extending toward the shaver side is rotatably and non-slidably attached, and the boss portion of the movable shaver is disposed and accommodated inside the rim portion of the fixed pulley.

Further, the cam member has a tapered cam surface that slopes radially outward and away from the movable shaver, and the weight support member has a support surface that extends along a plane perpendicular to the rotation axis. It is possible to do so.

(Function) With the above configuration, in the present invention, when the rotational speed of the rotating shaft increases, the centrifugal force on the centrifugal weight increases.
The centrifugal weight rolls outward in the radial direction, pressing the cam surface of the cam member, and this pressing causes the movable shaver integrated with the cam member to slide toward the fixed shaver, thereby increasing the radius of the variable pulley. The gear ratio changes automatically.

In that case, since the cam member is provided separately from the movable shave of the variable pulley, they can be made of different materials. For example, the movable shave may be made of lightweight special alloy or SF6.
The cam member is made of 345C or SC, which has excellent wear resistance.
It becomes possible to use a heat-treated material such as M, and weight reduction can be achieved while improving durability.

Moreover, since the cam member is pressed against the back surface of the movable shaver by the biasing force of the spring member and is movably fixed to the movable shaver, both can be easily and inexpensively assembled. Also, from this,
This makes it possible to easily replace the cam member due to wear and the like.

Furthermore, if a retractable cover member is installed between the inner periphery opposing surfaces facing the bottom of the belt groove of the fixed and movable shavers to seal the sliding part of the movable shaver with the rotating shaft, the sliding part of the movable shaver with the rotating shaft can be prevented. Foreign matter such as dust or water droplets may enter the movable shaver from the outside, making it difficult for the movable shaver to move, or the lubricant from the sliding portion may become splashed and adhere to the belt groove surface of the variable pulley, causing the belt to slip. It is possible to reliably prevent this from occurring. In addition, if an extendable cover member is installed between the spring receiving member and the cam member to seal the sliding part of the centrifugal weight, it is possible to prevent the centrifugal weight from rolling incorrectly, as well as to lubricate the sliding part of the centrifugal weight. It is possible to more reliably prevent the belt from slipping due to adhesion of the agent.

In addition, a fixed pulley having a rim part of a predetermined width on its outer periphery extending toward the movable shave side is mounted on the rotating shaft on the back side of the movable shave so as to rotate integrally and not be able to slide. When the boss part of is placed and accommodated,
This rib portion and the boss portion of the movable shaver can be overlapped in the axial direction, and the length in the axial direction from the fixed pulley to the variable pulley can be shortened even though the fixed pulley is attached.

- furthermore, the cam member has a tapered cam surface that slopes radially outwardly away from the movable shaver, and the weight support member has a support surface that extends along a plane perpendicular to the axis of rotation; In this case, it is possible to easily attach a holding member that arranges and holds the centrifugal weights at equal intervals in the circumferential direction, and it is possible to stably arrange the centrifugal weights at equal intervals in the circumferential direction.

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

The drawings show the overall structure of an automatic transmission according to an embodiment of the present invention, in which 1 is a drive shaft that is rotatably and concentrically attached to one end of a crankshaft 40 of an engine (not shown) by a mounting bolt 1a; 2; is a driven shaft as a rotating shaft in the present invention, which is disposed parallel to the drive shaft 1, and the driven shaft 2 is rotatably connected to a support shaft 41 rotatably supported on an engine cylinder block or the like by a mounting bolt 2a. are attached concentrically to the

A drive pulley 3 is provided on the drive shaft 1. The drive pulley 3 includes a flange-shaped fixed shave 5 that is rotatably and non-slidably fixed to the drive shaft 1 at a boss portion 5a with a key 4, and a flange-shaped fixed shave 5 that is fixed to the drive shaft 1 so as to face the fixed shave 5. It consists of a flange-shaped movable shaver 6 that is slidably and rotatably supported by the common key 4 at the boss portion 6a, and between these shavers 5 and 6 is a belt groove 7 that has a V-shaped cross section. is formed.

On the other hand, on the driven shaft 2, there is provided a driven pulley 8, which has the same structure as the drive pulley 3 and serves as a variable pulley in the present invention. That is, this driven pulley 8 is
A fixed shave 10 is rotatably and non-slidably fixed to the driven shaft 2 at a boss portion 10a with a key 9, and a movable shave 6 for the fixed shave 5 on the drive pulley 3 on the drive shaft 1 is attached to the fixed shave 10. A movable shaver 11 is slidably supported on the driven shaft 2 by the key 9 at the boss portion 11a and supported by a rotary body so as to face in a direction opposite to the facing direction of the driven shaft 2.
．． A belt groove 12 having a V-shaped cross section is formed between the belt grooves 11 and 11 . Incidentally, each of the above-mentioned shavers 5, 6, 10.11 is made of a lightweight special alloy or spC material.

A V-belt 13 as a belt member is wound between the belt grooves 7 and 12 of both the pulleys 3 and 8, and the movable shaves 6 and 11 of the driving and driven pulleys 3 and 8 are connected to the fixed shaves 5 degrees. By moving the pulleys 3 and 8 toward and away from the V-belt 10 in opposite directions, the effective radius of the pulleys 3 and 8 relative to the V-belt 15 can be variably adjusted. For example, when the movable sheave 6 of the drive pulley 3 is brought closer to the fixed sheave 5 to increase the effective radius of the drive pulley 3, the movable sheave of the driven pulley 8 is moved by the accompanying movement of the V-belt 15 toward the drive pulley 3. 11 is separated from the fixed shave 10, and the effective radius of the driven pulley 8 is set to the drive pulley 3.
By making it smaller than , the gear ratio between both shafts 1 and 2 is increased to achieve a speed increase state. On the other hand, as shown by the imaginary line, when the movable shaver 6 is separated from the fixed shaver 5 and the effective radius of the drive pulley 3 is made small, the V-belt 1
5 toward the driven pulley 8 side, the movable sheave 11 of the driven pulley 8 approaches the fixed sheave 10, and the effective radius of the driven pulley 8 is made larger than that of the drive pulley 3. The gear ratio is reduced to achieve a deceleration state.

A flange-shaped eight support member 14 is mounted on the drive shaft 1 on the rear side (left side in the figure) of the movable shive 6 of the drive pulley 3 by the key so as to be integrally rotatable and non-slidable. This weight support member 14 has a flange portion 14a (
) which constitutes the spring receiving member of the present invention, and the flange portion.14. A has a cylindrical ring part 14b extending concentrically with the drive shaft 1 at a predetermined distance from the movable shovel 6 side, and a flange-shaped support part 14c extending radially outward at the tip of the ring part 14b. are set up in succession,
A support surface 15 extending along a plane perpendicular to the drive shaft 1 is formed on the surface of the support portion 14c opposite to the movable shaver 6 (the left side surface in the figure).

Further, the inner periphery of the ring portion 14b or the support portion 14c is partially cut out at equal intervals in the circumferential direction, and the flange portion 14a corresponding to the cutout portion has a plurality of spring receiving portions 16, 16. ... is recessed, and a driving side spring 18 is compressed between each spring receiving portion 16 and a ring-shaped spring retainer 17 attached to the back surface of the movable shaver 6 in a state of contact. The movable shave 6 is fixed by the spring force of 18.
side (right side in the figure).

Further, a fixed shave 5 is provided on the outer periphery of the movable shave 6 so as to cover the support portion 14c of the weight support member 14.
A drive-side cam drum 19 extending concentrically with the drive shaft 1 on the opposite side is integrally attached with mounting bolts 20, 20, . . . . The tip of the cam drum 19 extends closer to the flange 14a than the support 14c, and is formed into a tapered shape whose diameter decreases toward the flange 14a. A tapered cam surface 19a is formed on the surface (the right side surface in the figure) and is inclined in a direction toward the movable shaver 6 toward the outside in the radial direction.

Furthermore, the retainer 21 is attached to the support surface 15 of the weight support member 14 with mounting screws 22, 22. It is attached by... This retainer 21 has a plurality of weight fitting parts 2 formed by cutting out parts of its outer circumference at equal angular intervals.
1a, 21a, . Cam surface 19a and weight support member 1
The support surface 15 of No. 4 is sandwiched so as to be rotatable in the radial direction.

On the other hand, on the driven shaft 2 on the back side (right side in the figure) of the movable shuv 11 of the driven pulley 8, there is a
A flange-shaped weight support member 24 made of heat-treated material such as 45C or SCM is rotatably and non-slidably attached by the key 9. This weight support member 2
4 includes a flange portion 24a arranged to face the movable shovel 11, and a cylindrical ring portion 24b extending concentrically from the flange portion 24a to the driven shaft 2 at a predetermined distance from the movable shovel 11 side. This ring portion 24b
A flange-shaped support portion 2 extending radially outward is provided at the tip of the
4c are arranged in series, and the movable shave 11 of this support part 24c
A support surface 25 extending along a plane perpendicular to the driven shaft 2 is formed on the opposite surface (the right side in the figure). Also,
The inner periphery of the ring portion 24b or the support portion 24c is partially cut out at equal intervals in the circumferential direction, and the flange portion 24a corresponding to the cutout portion has a plurality of spring receivers 26, 26. ... (one chisel is shown) is recessed, and a driven side spring 27 having a smaller spring force than the driving side spring 18 is compressed between each spring receiving portion 26 and the back surface of the movable shovel 11. The spring force of the spring 27 biases the movable shaver 11 toward the fixed shovel 10 (toward the left side in the figure).

Also, a boss portion 1 extending toward the back side of the movable shave 11 is provided.
A driven side cam drum 28 is externally fitted on the outer periphery of 1a, and the cam drum 28 is pressed against the back surface of the movable shaver 11 by the biasing force of the spring 27 and is fixed integrally with the movable shaver 11 so as to move in the axial direction. . The outer peripheral portion of the cam drum 28 is curved radially outward toward the support portion 24c of the weight support member 24, and is flush with the support portion 24C (
On the right side in the figure), there is a tapered cam surface 28 that slopes radially outward and away from the movable shaver 11.
a is formed.

Furthermore, a retainer 29 is attached to the support portion 24c of the weight support member 24. This retainer 29
has a plurality of weight fitting portions 29a formed by partially cutting out the outer periphery at equal angular intervals.

29a, ... (only one is shown), and a centrifugal weight 30 made of a roller is fitted into each weight fitting part 29a, and this centrifugal weight 30 is connected to the cam surface 28a of the cam drum 28. It is held between the weight support member 24 and the support surface 25 so as to be able to roll in the radial direction.

Further, between the inner circumferential opposing surfaces of the fixed and movable shaver 5.6 facing the bottom of the belt groove 7 of the drive pulley 3, there is provided an expandable cover member for sealing the sliding portion of the movable shaver 6 with the drive shaft 1. A rubber dust seal 31 is installed. This dust seal 31 includes both shaves 5,
6, a ring-shaped locking portion 5b protrudes from the shavers 5 and 6.

6b, it is locked and fixed in such a way that it cannot fall off. Further, between the outer periphery of the flange portion 14a of the weight support member 14 and the outer periphery of the tip end of the drive side cam drum 19, there is a rubber cylindrical dust cover 32 as a cover member that can be expanded and contracted. cam drum 19
The dust covers 32 are fixed to the outer circumferences of the tips of the centrifugal weights 23. 23
．． The sliding parts of ... are sealed.

On the other hand, the fixed and movable shaver 10 in the driven pulley 8
．． A dust seal 3 for sealing the sliding portion of the movable shaver 11 with the driven shaft 2 is provided on the inner peripheral surface facing the bottom of the belt groove 12 of No. 11, similar to the drive-side dust seal 31 described above.
3 has been constructed.

Attachment of this dust seal 33 to both shaves 10.11 (I11 structure is the same as the drive side dust seal 31, and is locked and fixed by the locking portions IQb and llb of the shaver 10.11. A rubber cylindrical dust cover 34 as an expandable cover member is installed between the outer periphery of the flange portion 24a and the outer periphery of the driven side cam drum 28, with both ends thereof fixed to the outer periphery of the flange portion 24a and the outer periphery of the cam drum 28, respectively. The sliding parts of the centrifugal weights 30, 30, . . . are sealed by the dust cover 34.

In addition, on the driven shaft 2 on the back side of the movable shuv 11 in the driven pulley 8, there is a
An output pulley 35 made of a V-ribbed pulley having a rim portion 35a of a predetermined width extending toward the outer periphery is supported, and this output pulley 35 is attached to the rear surface of the flange portion 24a of the weight support member 24 by mounting bolts 36, 36. ..., and is attached to the driven shaft 2 so as to rotate integrally and not be slidable. And the above output pulley 3
The boss portion 1a of the movable shaver 11 is arranged inside the rim portion 5a of the movable shaver 11, and the spring 27, cam drum 28, weight support member 24, retainer 29, centrifugal weight 30, 30, . ... and a dust cover 34 are arranged and accommodated.

Further, a V-ribbed belt 37 is wound between the rim portion 35a of the output pulley 35 and a pulley in an auxiliary machine (not shown) of the engine.

Therefore, the centrifugal force caused by the rotation of the drive shaft 1 and the driven shaft 2 causes the centrifugal weights 23 and 30 on the drive side and the driven side to move outward in the radial direction of the respective shafts 1 and 2 against the biasing force of the drive side spring 18. Due to the pressure of the cam drum 19.28 against the cam surfaces 19a, 28a, the movable shave 6 of the drive pulley 3 is slid in the direction away from the fixed shave 5, reducing the effective radius, while the driven pulley 8
By sliding the movable shaver 11 in a direction approaching the fixed shaver 10 to increase the effective radius,
The groove bottom is designed to change the gear ratio between the shafts 1 and 2 from a speed increase state to a deceleration state, and to keep the rotation speed of the auxiliary equipment substantially constant regardless of the increase in the engine speed.

Therefore, in the above embodiment, when the engine is operating, the rotation is from the drive pulley 3 on the drive shaft 1 to the belt 1.
3 to the driven pulley 8 on the driven shaft 2, and the speed is changed during that time. The rotation of this driven shaft 2 is caused by the output pulley 3
5 and the V-rubbed belt 3 hung on its lip portion 35a.
It is transmitted to the auxiliary equipment via the valve.

When the engine speed is low, the drive pulley 3
Centrifugal weight in 23.23. ... is on the inside in the radial direction, and the movable shaver 6 is moved to a position closer to the fixed shaver 5 by the biasing force of the drive side spring 18, so that the effective radius of the drive pulley 3 is increased. On the other hand, also in the driven pulley 8, the centrifugal weight 3
0,30. ...is on the inside in the radial direction. Further, since the diameter of the drive pulley 3 increases due to the spring force of the drive side spring 18, the V-belt 13 is pulled toward the drive pulley 3. It moves in a direction away from the fixed shave 10 against the force, and this movement reduces the effective radius of the driven pulley 8. the result,
Since the effective radius of the driving pulley 3 is larger than that of the driven pulley 8, the rotation of the engine is increased in speed and transmitted to the auxiliary equipment.

On the other hand, when the engine speed increases, the centrifugal force acting on each centrifugal weight 23 on the drive pulley 3 side increases, so that the centrifugal weight 23
rolls radially outward along the support surface 15 of. As the centrifugal weight 23 rolls, the cam surface 19a that holds the weight 23 between it and the support surface 15 is pressed, and the cam drum 19 is pushed to the left in the figure, and the cam drum 19 is integrated with the one cam drum. The movable shaver 6 resists the urging force of the driving spring 18 and slides to the left away from the fixed shaver 5, thereby reducing the radius of the driving pulley 3.

Furthermore, on the driven pulley 8 side, due to the increase in centrifugal force acting on each centrifugal weight 30, the centrifugal weight 3
0 rolls radially outward along the support surface 25 of the weight support member 24, and as the centrifugal weight 30 rolls, the cam surface 28a is pressed, and the cam drum 28, together with the biasing force of the driven spring 27, rotates as shown in FIG. , the movable shaver 11 integrated with the cam drum 28 slides to the left against the biasing force of the driving spring 18 and approaches the fixed shaver 10 . The radius increases correspondingly to the decrease in the radius of the drive pulley 3. As a result, the gear ratio between the driving and driven shafts 1.degree.2 changes from the speed increasing state to the constant speed state and then to the decelerating state. In a high-speed range where the engine speed exceeds a predetermined value, the movable shave 6 of the drive pulley 3 is farthest away from the fixed shave 5, and the radius of the drive pulley 3 becomes the minimum, as shown by the imaginary line in the figure. On the other hand, the movable sheave 11 of the driven pulley 8 comes closest to the fixed sheave 10, the radius of the driven pulley 8 becomes maximum, and the engine rotation is decelerated to the maximum extent and transmitted to the auxiliary equipment. Due to the above-mentioned transmission characteristics, the rotation speed of the auxiliary equipment is kept almost constant despite the increase in engine speed, and once the specified rotation speed is reached, the gear ratio is fixed at a deceleration state in the subsequent high-speed range. Therefore, as the engine speed increases, the rotation speed of the auxiliary equipment increases.

In this case, since the driven side cam drum 28 is provided separately from the movable shaver 11 of the driven pulley 8, they can be made of different materials, and the movable shaver 11 can be made of a light special alloy or SPC material. On the other hand, the cam drum 28 can be made of a heat-treated material such as 345C or SCM, which has excellent wear resistance, and can achieve both improved durability and reduced weight.

Moreover, the cam drum 28 is pressed against the movable shovel 1 by the biasing force of the spring 27 against the back surface of the movable shovel 11 and is fixed as a movable unit, making it easier and cheaper to connect the two with bolts. can be assembled into. Also, for this reason, the cam drum 2
8 can be easily replaced due to wear or the like.

Further, in the driving and driven pulleys 3, 8, between the inner circumferential opposing surfaces facing the bottoms of the belt grooves 7, 12 of the respective fixed shaves 5, 10 and movable shaves 6, 11, the movable shaves 6, 11 and the shaft 1, Since the movable shavers 6, 11 and the shafts 1, 2 are equipped with expandable dust seals 31 and 33 that seal the sliding parts of the shafts 1 and 2, foreign matter such as dust and water drops from the outside cannot get into the 1u moving parts of the movable shavers 6 and 11 and the shafts 1 and 2. TeiiJ dynamic shave 6,11
It is possible to reliably prevent the belt 13 from becoming difficult to move, or from causing the lubricant on the sliding parts to become splashed and adhere to the belt groove surfaces of the pulleys 3 and 8, causing the belt 13 to slip. can. Moreover, the weight support part is 4.24 N.
and the cam tram 19.28, there is a centrifugal weight 23
．． Stretchable dust cover 3 that seals the sliding part of 30
2.34, it is possible to prevent the centrifugal weights 23 and 30 from malfunctioning in the same Fl as mentioned above, and it is also possible to more reliably prevent the belt 13 from slipping due to adhesion of lubricant.

In addition, since the centrifugal unit 23.30 is placed on both the drive and driven pulleys 3 and 8, the S speed change responsiveness to changes in the number of engine revolutions is increased, and for example, when a car suddenly stops Even when this occurs, the belt 13 does not get caught in the belt grooves 7, 12 of the pulleys 3, 8, suppressing the occurrence of vibrations at the time of restarting, and extending the life of the belt 13. Moreover, the hysteresis between speed increase and deceleration changes, that is, the driven shaft 2 at a predetermined rotation speed of the drive shaft 1,
It is possible to reduce the difference when switching between increasing and decelerating the rotational speed.

Further, on the driven shaft 2 on the back side of the movable shuv 11 in the driven pulley 8, a rim portion 35a having a predetermined width extending toward the movable shuv 11 side is provided on the outer periphery.

The output pulley 35 is rotatably and non-slidably attached, and the boss portion 11a of the movable shaver 11 is housed inside the rim portion 5a of the output pulley 35.
The rib portion 35a of the output pulley 35 and the movable wave 11
Due to the axial overlap with the boss portion 11a, the axial length from the output pulley 35 to the driven pulley 8 can be shortened even though the output pulley 35 is attached.

Furthermore, the drive side cam drum 19 has a tapered cam surface 19a that is inclined radially inward in a direction away from the +iJ movement lever 6 of the drive pulley 3, and the weight support member 14 is perpendicular to the drive shaft 1. Since it has a support surface 15 extending along a plane, the centrifugal weight 23. 23.
The retainer 21 for holding the centrifugal weights 23, 23 . . . can be easily attached. ... can be stably arranged at equal intervals in the circumferential direction. Also,
On the driven side, the cam drum 28 likewise moves radially outwardly towards the movable shaver 11 of the driven pulley 8.
Since the weight support member 24 has a tapered cam surface 28a that is inclined in a direction away from the centrifugal weights 30, 30. Two retainers for holding the centrifugal weights 30, 30 . . . can be easily attached.
... can be stably arranged in the circumferential direction.

Although the above embodiment is a case in which the present invention is applied to the driven pulley 8 side, the present invention can also be applied to the driving pulley 3 side instead of the driven pulley 8 side. In that case, a fixed pulley is attached as an input pulley on the drive shaft 1 on the back side of the movable chain 6 of the drive boob I73.

Further, in the above embodiment, the transmission device A is shown as being interposed in the power transmission system from the engine crankshaft to the auxiliary equipment.
The present invention can also be applied to wheel drive systems of automobiles, two-wheeled vehicles, and various types of traveling transport machines.

(Effects of the Invention) As explained above, according to the present invention, a variable pulley consisting of a fixed shave and a movable shave is disposed on the back side of the movable shave separately from the movable shave while being integrally movable in the axial direction. , a cam member having a tapered cam surface;
A weight support member disposed on the back side of the movable shaver and having a support surface extending radially outward toward the cam surface, and a weight support member capable of rolling in the radial direction between the cam surface and the support surface. The sandwiched centrifugal weight and
A belt-type automatic transmission that changes speed by changing the radius of the variable pulley by rolling the centrifugal weight in the radial direction due to changes in centrifugal force and sliding the movable shaver by pressing the cam member against the cam surface. On the other hand, a spring member is provided on the rear side of the movable shaver to press and bias the cam member toward the movable shaver, and the biasing force of the spring member presses the cam member against the rear surface of the movable shaver and fixes the cam member as one unit. By doing this, the cam member and the movable shaver are separated to reduce the weight of the variable pulley, and the cam member can be easily and inexpensively assembled to the movable shaver, improving the ease of assembling the two and It is possible to facilitate the replacement of parts.

In addition, if an extendable cover member is installed between the inner circumferential opposing surfaces facing the bottom of the belt groove of both shaves to seal the sliding portion between the movable shaver and the rotating shaft, the sliding portion between the movable shaver and the rotating shaft may be installed. It is possible to reliably prevent malfunction of the movable shaver due to foreign matter entering the belt, and occurrence of belt slippage due to lubricant adhering to the entire surface of the belt. Also,
By installing an extendable cover member between the spring receiving member and the cam member to seal the sliding part of the centrifugal weight, it is possible to more reliably prevent the belt from slipping, and also prevent malfunction of the centrifugal weight from rolling. It can be prevented.

Furthermore, a fixed pulley having a rim portion of a predetermined width on its outer periphery extending toward the movable shave side is attached to the rotating shaft on the back side of the movable shave so as to rotate integrally and not be able to slide. By arranging and accommodating the boss part of the movable shave, the ribs of the fixed pulley and the boss part of the movable shave can be overlapped in the axial direction. The axial length of can be shortened.

Further, the cam member has a tapered cam surface that is inclined radially outward in a direction away from the movable shaver,
The weight support member shall have a support surface extending along a plane orthogonal to the rotation axis, so that the holding member for holding the centrifugal weight can be easily attached, and the centrifugal weight can be stably spaced at equal intervals in the circumferential direction. and can be placed.

[Brief explanation of the drawing]

The drawings are cross-sectional views showing embodiments of the present invention. A: transmission, 1: drive shaft, 2: driven shaft (
rotating shaft), 3... Drive pulley, 5... Fixed shave, 6... Movable shave, 7... Belt groove, 8... Driven pulley (variable pulley), 10... Fixed shave, 1
1...Movable shave, 11a...Boss part, 12...
・Belt groove, 13...V belt (belt member), 14
．． 24... Weight support member, 15.25... Support surface, one, 28... Cam drum (cam member), 19
a, 28 a... cam surface, 23.30... centrifugal weight, 27... driven side spring (spring member), 31.33... dust seal, 32. ．． 34
...Dust cover, 35...Output pulley (fixed pulley), 35a...Rim part. Patent applicant Band-Kagaku Co., Ltd. Representative Patent attorney 1) Hiroshi and one other procedural amendment (
Voluntary) October 21, 1988 1, Display of the case 1988 Patent Application No. 81761 2, Name of the invention Belt type automatic transmission device with centrifugal weight 3, Person making the amendment Relationship to the case Patent applicant Address 3-2-15 Meiwa-dori, Hyogo-ku, Kobe, Hyogo Prefecture Name (506) Band-Kagaku Co., Ltd. Representative Shogo Suzube 5, li[i Date of original order Voluntary amendment 6 Subject of amendment 7, Contents of amendment (1) Amend the claims of the specification as shown in the attached sheet. (In the 21 Specification, page 8, line 15 to page 9, line 2, ``In addition, if a fixed pulley is attached to the rotating shaft to transmit its rotation to another shaft... (omitted) ...The boss portion of the movable shaver is arranged and accommodated inside the rim portion of the fixed pulley.'' (3) Line 5 on page 11 of the specification to line 12 on the same page ``In addition, on the rotating shaft on the back side of the movable shave...
(Omitted)...The axial length from the fixed pulley to the variable pulley can be shortened. ” will be deleted. (4) Line 20 of page 31 to line 8 of page 32 of the specification
Line ``Furthermore, on the rotation axis on the back side of the movable shave,
...(omitted)...The axial length from the fixed pulley to the variable pulley can be shortened. ” will be deleted. a List of attached documents (1) Document 1 stating the entire text of the amended scope of claims 1
Attachment Sheet 2, Claims (1) Rotating so as to form a belt groove between a fixed shave fixed non-slidably and rotationally integrally on the rotating shaft and the fixed shave on the rotating shaft. A variable pulley consisting of a movable shaver integrally and slidably supported is provided, and the variable pulley is disposed separately from the movable shaver on the back side of the movable shaver and integrally movable in the axial direction, and tilts in a predetermined direction. a cam member having a tapered cam surface; a weight support member disposed on the back side of the movable shaver and having a support surface extending radially outward toward the cam surface; and the cam surface and the support surface. and a centrifugal weight sandwiched between the rotating shaft so as to be able to roll in the radial direction of the rotating shaft. A belt-type automatic transmission device that changes speed by sliding a movable shaver by pressing against a surface to change the radius of a variable pulley, the cam member being pressed toward the movable shaft on the back side of the movable shaver. A centrifugal weight characterized in that a biasing spring member is provided, and by the biasing force of the spring member, the cam member is pressed against the back surface of the movable shaver and fixed as one unit. Belt type automatic transmission. (2) Claim (1) in which an extendable cover member for sealing the sliding portion of the movable shave with the rotating shaft is installed between the opposing inner circumferential surfaces of the fixed and movable shaves facing the bottom of the belt groove.
) Belt-type automatic transmission equipped with centrifugal weights. (3) The centrifugal weight according to claim (1), wherein an expandable cover member for sealing the sliding portion of the centrifugal weight is installed between the spring receiving member that supports the spring member and the cam member. Belt type automatic transmission. (4) the cam member has a tapered cam surface that slopes radially outward in a direction away from the movable shave;
4. A belt-type automatic transmission equipped with a centrifugal weight according to claim 1, wherein the weight support member has a support surface extending along a plane orthogonal to the rotation axis.

Claims (5)

[Claims] (1) A fixed shave that is non-slidably and rotatably fixed on the rotating shaft, and a fixed shave that is rotatably and slidably supported on the rotating shaft so as to form a belt groove between the fixed shave and the fixed shave. a cam member comprising a variable pulley consisting of a movable shaver, the cam member being disposed on the back side of the movable shaver separately from the movable shaver and integrally movable 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 toward the cam surface; The centrifugal weight is rollably held between the shaft and the shaft, and the centrifugal weight is rolled in the radial direction by the change in centrifugal force caused by the rotation of the rotating shaft, and the movable shaver is slid by pressing the cam member against the cam surface. The belt-type automatic transmission device changes speed by changing the radius of a variable pulley, and the belt-type automatic transmission device is provided with a spring member on the back side of the movable shaver that presses and biases the cam member toward the movable shaver. A belt-type automatic transmission equipped with a centrifugal weight, characterized in that the cam member is pressed against the back surface of the movable shaver by the biasing force of the spring member and is fixed to the movable shaver as one unit. (2) Claim (1) in which an extendable cover member for sealing the sliding portion of the movable shave with the rotating shaft is installed between the opposing inner circumferential surfaces of the fixed and movable shaves facing the bottom of the belt groove.
) Belt type automatic transmission equipped with centrifugal weights. (3) The centrifugal weight according to claim (1), wherein an expandable cover member for sealing the sliding portion of the centrifugal weight is installed between the spring receiving member that supports the spring member and the cam member. Belt type automatic transmission. (4) On the rotating shaft on the back side of the movable shave, a fixed pulley having a rim portion of a predetermined width on its outer periphery extending toward the movable shave is attached to rotate integrally and non-slidably, and the rim of the fixed pulley Claim (1), (2) or (3), wherein the boss portion of the movable shaver is arranged and housed inside the portion.
) Belt type automatic transmission equipped with centrifugal weights. (5) the cam member has a tapered cam surface that slopes radially outward and away from the movable shave;
A belt type automatic transmission device equipped with a centrifugal weight according to claim 1, wherein the weight support member has a support surface extending along a plane orthogonal to the rotation axis.