JPH05340453A - Guide member for moving type pulley - Google Patents

Abstract

PURPOSE:To provide a guide member for moving type pulley for which cost is reduced through reduction of the number of parts and besides which has excellent reliability. CONSTITUTION:A guide member 3 for a moving type pulley comprises a fixed plate fixed on a drive shaft and a moving plate slidable in an axial direction. The guide member 3 has a base part 4 stuck to a recessed part formed in a ramp plate fixed on the drive shaft and engaged with a protrusion part formed to a moving plate to constrain relative rotation between the moving plate and the ramp plate. A guide groove 5 to guide axial movement of the moving plate is formed. Further, a protrusion piece 7a making slide contact with the protrusion part of the moving plate and protruded in a manner to be curved approximately in an S-shape and a protrusion piece 7b in a shape symmetrical to the protrusion piece 7a are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic transmission for a light vehicle such as a family bike, a snowmobile, and a water jet, an automatic transmission as an auxiliary machine for a four-wheel vehicle such as a supercharger, an agricultural machine, an automatic transmission for general industry The present invention relates to a movable pulley guide member used in a transmission or the like.

[0002]

2. Description of the Related Art In order to facilitate understanding of the present invention, a guide member for a movable pulley of a V-belt type automatic transmission is shown in FIGS. 3 and 4 together with the entire structure of the automatic transmission. Will be described below with reference to.

Reference numeral 11 is a drive shaft, and 12 is a movable pulley having a variable groove width. The pulley 12 has a dish-shaped fixed plate 13 fitted to the shaft end and a movable plate 14 slidable in the axial direction. Consists of. A V-shaped groove 15 is formed between the fixed plate 13 and the movable plate 14.

Reference numeral 16 denotes a lamp plate fixed to the drive shaft 11. A plurality of recesses 17 are formed in the peripheral edge of the lamp plate 16, and each recess 17 has a U-shaped guide member made of synthetic resin or the like. 18 are in close contact. A plurality of projections 20 integrally formed on the peripheral edge of the back surface 19 of the movable plate 14 inward in the radial direction are aligned with the guide member 18 so as to coincide with the installation positions of the recesses 17 of the lamp plate. Is slidably engaged in the direction. In this way, by engaging the protrusion 20 with the guide member 18, the movable plate 14 can rotate integrally with the lamp plate 16 and can slide in the axial direction. A plurality of roller chambers 21 are formed between the rear surface 19 of the movable plate 14 and the ramp plate 16 so as to become gradually narrower in the radially outer direction. The roller chamber 21 has a cylindrical weight roller movable in the radial direction. 22 are provided.

Reference numeral 23 is a driven shaft arranged in parallel with the drive shaft 11, and 24 is a driven pulley. The pulley 24 is movable in the axial direction of the fixed plate 25 fixed to the driven shaft 23 and the driven shaft 23. And a movable plate 26. Two
Reference numeral 7 denotes a spring that urges the movable plate 26 toward the fixed plate 25 side. A V-belt 28 is suspended between the driving pulley 12 and the driven pulley 24.

Next, the operation of the guide member as well as the automatic shifting operation of the transmission will be described with reference to FIGS.

When the rotational speed of the drive shaft 11 increases and the centrifugal force acting on the weight roller 22 gradually increases, the weight roller 22 slides radially outward on the rear surface 19 of the movable plate 14 to move the movable plate 14. Tries to push toward the fixed plate 13 side.

Therefore, in the movable plate 14, the projection 20 formed integrally is guided by the guide member 18 fitted in the recess 17 of the lamp plate 16, and the lamp plate 1 is guided.
While rotating integrally with 6, it moves to the left in FIG. As a result, on the drive side, the width of the V-shaped groove 15 is gradually narrowed, and the V-belt 28 comes into contact with the pulley 12 outside the pulley 12, and the winding diameter of the V-belt 28 is increased. Due to the radial expansion of the V-belt 28 of the drive-side pulley 12, the V-belt 28 in the driven-side pulley 24 resists the elastic force of the spring 27 and the fixed plate 25 and the movable plate 26.
And the movable plate 26 moves to the left in FIG. 3. In this way, the diameter of the V belt 28 wound around the pulley 24 is reduced (the reduction ratio is reduced), and the rotational speed of the driven shaft 23 is increased.

On the contrary, when the rotation speed of the drive shaft 11 decreases,
The centrifugal force acting on the weight roller 22 is reduced,
The weight roller 22 moves inward in the radial direction, and the movable plate 14 rotates integrally with the lamp plate 16 with the integrally formed projection 20 being guided by the guide member 18 that is in close contact with the recess 17 of the lamp plate 16. While moving to the right in FIG. As a result, on the drive side, the width of the V-shaped groove 15 is gradually widened, and the V-belt 28 contacts the inner side of the pulley 12, and the winding diameter of the V-belt 28 is reduced. On the other hand, on the driven side, since the movable plate 26 is pressed and urged toward the fixed plate 25 by the elastic force of the spring 27, the V-belt 28 moves radially outward and the V-belt 28 moves toward the pulley 24. The winding diameter increases (the reduction ratio increases), and the rotation speed of the driven shaft 23 decreases.

As described above, the rotation speed of the drive shaft 11 changes and the contact position of the V-belt 28 with respect to the pulley 12 or 24 changes, whereby the rotation of the drive shaft 11 changes automatically and continuously. The transmission is transmitted to the shaft 23 to change the speed.

As is clear from the above detailed description, V
Since the guide member of the belt type automatic transmission is always in contact with the projection of the movable plate, which is a mating member, a material excellent in slidability, rigidity, heat resistance, oil resistance and the like is used.

FIG. 5 is an exploded perspective view of the drive side of the transmission shown in FIG. In FIG. 5, 29 is a lid, 3
Reference numeral 0 denotes a bolt. To describe the functions of the lid 29 and the bolt 30, the weight roller 22 is housed in the roller chamber on the back surface (opposite to the fixed plate) of the movable plate 14, and the guide member is provided in the concave portion 17 on the periphery. After fixing the lamp plate 16 in which 18 is closely attached to the drive shaft 11, the bolt 30 is screwed to the female screw portion 31 of the movable plate 14 to integrate the lid body 29 and the movable plate 14, and the movable plate 14 is connected to the drive shaft 11. Even if it slides axially along the lamp plate 1
The guide member 18 fitted to the protrusion 20 of the movable plate 14 and the lamp plate 16 while restraining the movement of the shaft 6 in the axial direction.
It is for ensuring the engagement relationship with.

[0013]

However, since the lid 29 is not directly involved in the operation of the transmission itself and is not an indispensable component, reduction in material cost and processing cost due to reduction in the number of parts is required. At present, it is necessary to provide a device capable of performing a stable gear shift operation with a simpler configuration.

The present invention has been made in view of the above problems of the prior art, and an object thereof is to reduce the cost by reducing the number of parts and to have a movable operation excellent in operational reliability. To provide a guide member for a mold pulley.

[0015]

In order to achieve the above object, the gist of the present invention is a guide member for a movable pulley, which comprises a fixed plate fixed to a drive shaft and a movable plate slidable in the axial direction. A lamp plate fixed to the drive shaft, and has a base portion that is in close contact with a recess formed in the lamp plate, and engages with a protrusion portion formed on the movable plate to relatively rotate the movable plate and the lamp plate. In a guide member having a guide groove for restraining and guiding the movement of the movable plate in the axial direction and having a protruding piece that is in sliding contact with the protruding portion of the movable plate, the protruding piece is axially extended from the bottom of the guide groove. Movable type characterized by comprising one protruding piece protruding so as to bend in a substantially S shape and the other protruding piece protruding so as to be symmetrical to the opposite side in the axial direction. Pooh In the use guide member.

[0016]

The projecting portion of the movable plate is guided while slidingly contacting the S-shaped projecting piece arranged at the bottom of the guide groove and the curved portion of the projecting piece symmetrical to the S-shaped projecting piece with appropriate surface pressure. Therefore, the movable plate is not detached, the engagement relationship between the guide member and the protrusion is reliably maintained, and the predetermined gear shifting operation is smoothly performed.

[0017]

1 (a) to 1 (d) show a guide member 3 made of synthetic resin in which a U-shaped piece 1 is sandwiched between two deformed U-shaped pieces 2. Each of the U-shaped pieces 1 and 2 has a U-shaped base 4 that is in close contact with the recess 17 of the lamp plate, and a guide groove 5 that engages with the protrusion 20 of the movable plate and guides the movable plate 14 in the drive axis direction. It consists of the guide part 6,
A protruding piece 7 is arranged along the bottom surface of the guide portion 6. In this case, the recess 17 is formed in a shape capable of accommodating the guide member 3. And, as is clear from Fig. 1 (d),
The protruding piece 7 is one protruding piece 7 a protruding from the bottom of the guide groove 5 so as to be bent in an axially S-shape, and the protruding piece 7 a.
a is projected to the opposite side in the axial direction so as to have a symmetrical shape, and the other protruding piece 7b.

Next, an embodiment in which the guide member 3 is installed on the drive-side pulley 12 will be described with reference to FIG. The lamp plate 16, the distance collar 32, and the fixed plate 13 are sequentially inserted into the drive shaft 11,
Step 11a in which the lamp plate 16 is formed on the drive shaft 11
By tightening the nut 33 so as to press the lamp plate 16, the distance collar 32
The fixed plate 13 is integrally connected to the drive shaft 11. On the outer periphery of the distance collar 32, the movable plate 1
4 is supported by a bush 34 so as to be relatively rotatable and slidable in the axial direction, and between the movable plate 14 and the ramp plate 16 there are six weight rollers 22 in the circumferential direction.
Are arranged. On the outer periphery of the lamp plate 16, three guide members 3 are mounted in the circumferential direction in order to rotate the movable plate 14 together with the lamp plate 16, and the projecting pieces 7a and 7b projecting from the guide member 3 are provided. The curved portions C ₁ and C ₂ are the protrusions 2 formed on the movable plate 14.
The 0 end surface is contacted with a predetermined surface pressure. It is desirable that the frictional force generated between the both protruding pieces and the protrusions be made as small as possible within a range in which the movable plate 14 does not move arbitrarily due to gravity or vibration. Indicated dimension d
It can be performed by adjusting ₁ , d _{2 and the} like. Thus, as the rotational speed of the drive shaft 11 changes, the protrusion 20 of the movable plate 14 is axially guided while being pressed against the projecting pieces 7a and 7b of the guide member 3 mounted on the lamp plate 16 with an appropriate pressure contact force. , The gear shifting operation is performed smoothly.

By the way, in order to assemble the assembly of the movable plate 14 of the drive side pulley 12, first, the six weight rollers 22 are mounted inside the movable plate 14, and then the three protrusions 20 of the movable plate 14 are mounted. The guide grooves 5 of the three guide members mounted on the lamp plate 16 are engaged with each other, and the distance collar 32 is fitted to the center of the movable plate 14. At this time, since the protruding pieces 7a and 7b provided on the guide member 3 are pressed against the protrusions 20 formed on the movable plate 14 with an appropriate pressing force, a predetermined frictional force is generated between the movable plate 14 and the guide member 3. Acts to restrict the movable plate 14 from freely moving. This avoids inconveniences such as disengagement of the movable plate 14 from the guide member 3 and drop of the weight roller 22 assembled with great care, and the temporarily assembled movable plate 14 is avoided.
The movable plate 1 even when the
There is no possibility that the assembly will be disassembled due to the movement of 4 due to vibration or the like. Moreover, since the protruding piece is curved in an S shape,
When the projection 20 and the guide member 3 are engaged with each other, the protruding piece 7
Since the tip a can be assembled along the back surface 19 of the movable plate, the guide member is less likely to be damaged.

[0020]

Since the present invention is configured as described above, it has the following effects.

According to the present invention, the substantially S-shaped protruding piece integrally formed with the guide member can be brought into contact with the movable plate with an appropriate pressure contact force to regulate the free movement of the movable plate in the axial direction. Therefore, it is possible to avoid the inconvenience that the movable plate moves freely when assembling the drive side pulley and the assembling work becomes difficult.When the temporarily assembled assembly is conveyed, the movable plate and the guide member may be vibrated due to vibration or the like. There is no risk of disengagement.

Therefore, since a component such as a lid, which is conventionally required to prevent the movable plate from falling off, is not required, the cost can be reduced by reducing the number of components and the productivity can be improved by reducing the number of assembling steps. It will be possible.

Further, since the protruding piece has a structure that is curved in a substantially S shape, there is little risk of damage during assembly.

Since the space for mounting the lid is unnecessary, the transmission can be downsized.

[Brief description of drawings]

1 is a view showing a guide member having a protruding piece according to the present invention, FIG. 1 (a) is a sectional view taken along the line AA of FIG. 1 (c),
1 (b) is a right or left side view, FIG. 1 (c) is a plan view, FIG.
(d) is a front view.

FIG. 2 is a cross-sectional view when a guide member according to the present invention is installed on a drive-side pulley.

FIG. 3 is a plan view including a cross section of a V-belt type automatic transmission.

FIG. 4 is a sectional view taken along the line BB of FIG.

5 is an exploded perspective view of a drive side of the transmission shown in FIG.

[Explanation of symbols]

 3 ... Guide member 4 ... Base part 5 ... Guide groove 6 ... Guide part 7, 7a, 7b ... Projection piece 11 ... Drive shaft 12 ... Pulley 13 ... Fixed plate 14 ... Movable plate 16 ... Lamp plate 17 Recess 18 Guide member 20 Protrusion

Claims (1)

[Claims] 1. A guide member for a movable pulley, comprising a fixed plate fixed to a drive shaft and a movable plate slidable in the axial direction, the recess being formed in a lamp plate fixed to the drive shaft. A guide groove that has a base portion that closely adheres to the movable plate and that engages with the protrusion formed on the movable plate to restrain the relative rotation between the movable plate and the lamp plate and guide the movement of the movable plate in the axial direction. In a guide member provided with a projecting piece that is formed and is in sliding contact with the projecting portion of the movable plate, the projecting piece is one projecting piece that projects from the bottom of the guide groove so as to bend in a substantially S shape in the axial direction, A movable-type pulley guide member, characterized in that the one protruding piece is formed on the opposite side in the axial direction so as to have a symmetrical shape, and the other protruding piece is formed.