JPS6182061A - V belt transmission device - Google Patents

Abstract

PURPOSE:To prevent the generation of a slip in a V belt and improve its transmission efficiency, by providing a gear member between a fixed pulley half unit and a movable pulley half unit in at least one of the V pulleys and forming a tooth part in an internal peripheral surface part of the V belt. CONSTITUTION:A variable diameter type transmission V pulley 22 in a driving side comprises a fixed pulley half unit 23, movable pulley half unit 24 and a sprocket 25 arranged between the both pulleys 23, 24. While a variable diameter type transmission V pulley 37 in a driven side comprises a fixed pulley half unit 41, variable pulley half unit 44 and a driven side sprocket 42 arranged between the both pulleys 41, 44. A V belt bridging these pulleys 22, 37, being constituted by an endless belt 56 and a plurality of V blocks 57, forms a tooth 42a in an internal peripheral surface of the endless belt 56 in a width direction while a stopping recessed part 56b of the V block 57 in the width direction in a position corresponding to a tooth 56a on the peripheral surface.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention transmits the rotation of the drive shaft to a variable diameter transmission pulley.
! The present invention relates to a V-belt transmission device that transmits transmission to a driven shaft via a V-belt that frictionally engages with the driven shaft.

[Prior art] This V-belt transmission device has a V-belt mounted on a pulley on the driving shaft side and a pulley on the driven shaft side, and the V-belt is mounted on both sides of the V-shaped annular groove of each pulley. ■Shape slope 1!
! Through frictional engagement, the rotation of the drive shaft is transmitted to the driven shaft to rotate the driven shaft, and during this rotation the V of the V pulley on the drive shaft side is
By narrowing or widening the groove spacing, at the same time widening or narrowing the groove spacing on the V pulley on the radial driving shaft side,
By changing the rotation of the driven shaft, a stepless and smooth gear ratio can be obtained with a simple structure.

This V-belt transmission device applied to a continuously variable transmission for a motorcycle, for example, will be explained with reference to FIG. 1.A fixed pulley half 2 and a movable pulley half 3 are provided on a drive shaft 1 connected to a drive source. a variable diameter transmission V-pulley 4 on the drive side, and a fixed pulley half provided at the inner end of a fixed pulley shaft 7 rotatably supported via bearings 6a and 6b on a driven shaft 5 connected to the rear wheel. A V-belt 1 is disposed between a driven-side variable diameter transmission VJV pulley 10 consisting of a body 8 and a movable pulley half body 9.
The rotation of the drive shaft 1 is transmitted to the driven pulley 10 via the V-belt 11, and as the rotation speed of the drive shaft 1 increases, the V-shaped and J-shaped annular grooves of the pulleys 4 and 10 Continuously variable speed is performed by varying the width and changing the diameters of both pulleys 4 and 10.

[Problem that the invention seeks to solve]

As described above, the rotation of the drive shaft is transmitted to the driven shaft by the FJl engagement between the V pulley and the V belt, but due to the fluctuation of the transmitted torque or the effective winding of the V belt, Depending on the angle of the attachment, the effective winding circumference, etc., the V-pulley and V-belt may slip, resulting in a lack of follow-up and stability of the transmission ability, especially when the V-belt engages with the V-pulley at a small diameter. In this case, especially on the drive shaft side, the effective circumference of the belt and pulley winding is small and the torque fluctuations of the power source are directly transmitted, making it prone to slipping and reducing transmission efficiency. Abnormal heat generation on the friction surface due to friction or slippage may reduce the durability of the V-belt or V-pulley.

Therefore, the present invention aims to improve the transmission efficiency and the durability of each component by suppressing the occurrence of slip.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention provides a V-belt that transmits the rotation of the drive shaft to the driven shaft through a V-belt that frictionally engages variable diameter transmission V pulleys provided on the drive shaft and the driven shaft, respectively. In the transmission device, the variable diameter transmission V pulley of the front two drive shafts and the driven shaft has a fixed pulley half fixed to the drive shaft or the driven shaft and a movable pulley half movable in the axial direction thereof. A gear member is provided between the fixed pulley half and the movable pulley half on at least one of the variable diameter transmission pulleys of the drive shaft or the driven shaft, and the V belt is provided with the fixed pulley half on both sides. and an inclined surface that engages the ffiIM in the V-shaped annular groove formed by the movable boom half,
It is constructed by continuously fitting V blocks each having a frontage on the inner circumferential surface in the longitudinal direction of the outer circumferential surface of an endless belt having teeth on the inner circumferential surface that mesh with the teeth of the gear member. Connect the V-belt to the drive shaft! It is characterized by being installed between the variable diameter transmission V-booley of the l' and II shafts.

(Function) When the V-belt engages with the -C small diameter pulley, the teeth on the inner circumference of the V-belt mesh with the teeth of the gear member to ensure rotation is transmitted. .

〔Example〕

An embodiment of the present invention applied to a continuously variable transmission for a motorcycle will be described with reference to FIGS. 2 to 6.

A drive shaft 21 connected to a drive source is provided with a variable diameter transmission pulley 22 on the drive side. This V pulley 22 is
Fixed pulley half 23, movable pulley half 24, and both pulleys 2
3. Sprocket 2 serving as a gear member disposed between 24
5, the fixed pulley half 23 is formed on a disk having a conical surface 26 on one side and is fixed to the end of the drive shaft 21, and the sprocket 25 has a guide boss 27 fixed to the drive shaft 21. is integrally formed at one end and disposed between the fixed pulley half 23 and the movable pulley half 24,
The movable pulley half 24 is formed into a short cylindrical shape with a conical surface 28 on one surface, and is fitted onto the guide boss 27 so as to be movable in the axial direction, and is connected to the fixed pulley half 23 and the movable pulley half. A V-shaped annular groove 29 is formed facing oppositely to 24, and a V-belt 30 is inserted into this annular groove 29 and held between the oppositely facing conical surfaces 26 and 28.

At the other end of the guide boss 27 is a 1"-l guide plate 31.
A tapered groove 34 that gradually narrows in the radial direction is formed by the inclined surface 32 of the guide plate 31 and the inclined surface 33 formed on the back surface of the movable pulley half 24. A centrifugal roller 35 is housed in a floating state. Then, the drive shaft 21 is rotated,
As the rotational speed increases, the plurality of centrifugal rollers 35 receive centrifugal force and move radially outward, moving the movable pulley half 24 in a direction approaching the fixed pulley half 23 (toward the left in Figure 2). )
The engagement radius of the V-belt 30 with the conical surface 26, 28 can be increased.

The driven shaft 36 is provided with a variable diameter transmission pulley 37 on the driven side. This ■ pulley 37 is supported by bearings 38 and 39 fitted to the driven shaft 36.
0, a fixed pulley half 41 that is fixed to the inside of the pulley shaft 40 (on the right side in FIG. 2), a driven sprocket 42 that is a gear member that is fixed to this fixed pulley half 41, and a fixed It has a movable pulley half 44 fixed to a movable pulley shaft 43 that is fitted to the outer periphery of the side pulley shaft 40 so as to be movable in the axial direction, and the fixed pulley half 41 and the movable pulley half 44 have conical surfaces 45.4 facing each other.
6 are formed, and the V-belt 30 is inserted into a V-shaped annular groove 47 formed between these conical surfaces 45 and 46, and is held between the conical surfaces 45 and 46. As a result, the V-belt 30 is mounted between the variable-diameter transmission pulley 22 on the drive side and the variable-diameter transmission V-pulley 3''7 on the driven side.

The movable pulley shaft 43 of the movable pulley half 44 has an elongated hole 48 extending in the axial direction, and a guide pin 49 protruding from the fixed pulley shaft 40 is rotatably inserted into the elongated hole 48. A supported guide roller 50 is engaged, and the movable pulley @43 is guided by the elongated hole 48 and the guide roller 50 so that it can move left and right in the axial direction. - A drive plate 52 equipped with a clutch weight 51 is attached to the outer end of the fixed pulley shaft 40 (the left end in FIG. 2).
A coil spring 53 is compressed between the drive plate 52 and the movable pulley half 44, and urges the movable pulley half 44 to approach the fixed pulley half 41.

A clutch outer 54 is fixed to the outer end (left end in FIG. 2) of the driven shaft 36, and the driven side fixed pulley shaft 40
When the rotation speed of the drive plate 52 exceeds a predetermined value, the drive plate 52
A clutch shoe 55 fixed to the outer periphery of a clutch weight 51 that is pivotally supported so as to be rotatable in the radial direction contacts the inner circumferential surface of the clutch outer 54 and the clutch outer 5
The driven shaft 36, which rotates together with 4, is rotated.

V-belt 30 that transmits the rotation of the drive shaft 21 to the driven shaft 36
As shown in FIGS. 3 and 4, the endless belt 5
6 and a plurality of V blocks 57.

The endless belt 56 has the sprocket 2 on its inner peripheral surface.
5.42 teeth 25a.

42a are formed in the width direction, and a locking recess 5 of the V block 57 is formed at a position corresponding to the tooth 56a on the outer peripheral surface.
6b is formed in the width direction, while the V block 57 is
Frictional engagement occurs between the conical surface 26 of the driving side fixed pulley half 23 and the conical surface 28 of the movable pulley half 24, and between the conical surface 45 of the driven side fixed pulley half 41 and the conical surface 46 of the movable pulley half 44. The upper parts of the left and right leg parts 57C and '57d, which have matching inclined surfaces 57a and 57b on their side surfaces, are connected by a connecting part 57e to form a substantially U-shaped cross section with an opening in the center of the inner peripheral surface, Further, a locking convex portion 57f corresponding to the locking recess 56b of the endless belt 56 is formed in the width direction on the inner surface of the connecting portion 57e, and a locking convex portion 57f corresponding to the locking recess 56b of the endless belt 56 is formed on the inner surface of the left and right leg portions 57c, 57d. Matching recesses 57g, 5
71”+ respectively, and this ■ block 57
from the outer peripheral surface of the endless belt 56 to the left and right legs 57c.
, 57d are fitted to hold the endless belt 56, and the locking convex portion 57f is inserted into the locking recess 56 of the endless belt.
b, and the recesses 5'7q of the left and right legs 57C and 57d.
, 57h are engaged with both ends of the teeth 56a of the endless belt 56 to attach the V block 57 to the endless belt 56, and the V blocks 57 are continuously disposed in the longitudinal direction of the endless belt 56 to form the V belt 30. do. This V-belt 30 is mounted between the variable diameter transmission pulley 22 on the driving side and the variable diameter transmission boot 93 on the driven side.

Next, to explain the operation of the continuously variable transmission configured in this way, when the rotation of the drive shaft 21 is low, the interval between the ■-shaped annular grooves 29 of the drive side variable diameter transmission V pulley 22 widens; The driven side variable diameter die 36 is rotated.

As the rotation of the drive shaft 21 increases, the interval between the V-shaped annular @29 of the drive side pulley 22 becomes narrower, and
The belt 30 is connected to the V pulley 22 as shown in the lower half of FIG.
As a result, the movable pulley half 44 of the driven pulley 37 moves away from the fixed pulley half 41 against the spring 53, and the interval between the ■-shaped annular grooves 47 widens, causing the V The belt 30 engages the driven pulley 37 with a gradually smaller diameter, and at maximum rotation, the V-belt 30 meshes its teeth 56a with the teeth 42a of the sprocket 42. Therefore, drive shaft 2
1 is transmitted to the sprocket 42 on the driven side by the teeth 56a of the V-belt 30 via the V-belt 30 that engages the pulley 22 on the drive side with a large diameter, and
2. Rotate the slave e@36 at increased speed via the clutch outer 54.

Therefore, in the case of a low ratio, the driving side mainly uses the tooth part transmission by the sprocket 25 and the V456a of the V belt 30, and is assisted by the V-plane friction transmission of the centrifugal roller 35, and the driven side uses the V-plane friction transmission by the spring 53. It is said that
In the case of a high ratio, the drive side uses V-plane friction transmission of the centrifugal roller 35, and the driven side mainly uses tooth section transmission by the sprocket 42 and the teeth 56a of the V-belt 30, with the V-plane friction transmission by the spring 53 assisted. The driving force can be transmitted reliably.

Further, as mentioned above, the V belt 30 is connected to the V pulley 22 or V pulley 37 and the inclined surfaces 57a and 5 on both sides of the V block 57.
From the state of frictional engagement at 7b, ΔP is lower than the bit Po.
It becomes larger in appearance. If the belt continues to rotate, the pitch difference ΔP will accumulate and the belt will become 1/1 of the belt pitch PO.
2 minutes, the belt teeth move relative to each other, and in synchronization at a certain rotation angle, the teeth 56a of the V-belt 30 and the teeth 25a of the sprocket 25
The two mesh together.

That is, if the number of teeth on the sprocket is 7, the number of teeth on bell 1- required for normal meshing is nl, and the wrap angle required for normal meshing is α, then the meshing circumference of the belt and the meshing circumference of the sprocket are , I Poxn +4P+

2π Incidentally, the pitch angle e of the teeth of the sprocket is e=-.

Therefore, the sprocket does not need to rotate one revolution to achieve normal meshing, resulting in smooth meshing.

With the above configuration, even if the V-belt 30 engages with the drive-side pulley 22 or the driven-side V-pulley 37 with a small diameter, the teeth 56a of the V-belt 30 are connected to the teeth 25a of the sprocket 25 or the sprocket 42, respectively. tooth 42
Since the V-belt 30 meshes with the V-belt 30, rotation can be reliably transmitted without slippage, and the durability of the parts is also improved.

In addition, since the diameter of the sprocket can be made smaller compared to only friction transmission using a V-belt, the reduction ratio can be increased, and the entire device can be made more compact and lighter.
Furthermore, since the rotational inertial mass is small, transmission efficiency is also improved.

In the above embodiment, the gear member is provided on both the V-pulleys on the drive shaft side and the driven shaft side, but it may be provided on either the V-pulley on the drive shaft side or the driven shaft side. Also,
Although the teeth 56a of the V-belt 30 have been described as having a round tooth shape in cross section, they may have a tooth shape such as a trapezoidal cross section.

〔Effect of the invention〕

As described above, the present invention uses I! In a V-belt transmission device that transmits the rotation of a drive shaft to a driven shaft via a V-belt that engages with J friction, the variable diameter transmission V pulley of the drive shaft and the driven shaft is fixed to the drive shaft or the driven shaft. The fixed pulley half and the variable pulley half are movable in the axial direction. A gear member is provided between the V-belt and the V-belt.
11 in the shape annular groove! A V-block having a frictionally engaging inclined surface and an opening formed on the inner circumferential surface thereof is continuously fitted in the longitudinal direction of the outer circumferential surface of an endless belt having teeth on the inner circumferential surface that mesh with the teeth of the gear member. This V-belt is installed between the variable-diameter transmission pulleys of the drive shaft and driven shaft, so rotation can be reliably transmitted by suppressing the occurrence of slip between the V-belt and the V-pulley. The durability of the system is also improved, and it is also possible to increase the reduction ratio, making the entire device compact and lightweight.

[Brief explanation of drawings]

Figure 1 is a sectional view showing the continuously variable transmission of a conventional motorcycle.
Fig. 2 is a cross-sectional view showing the V-belt transmission device of the present invention applied to a continuously variable transmission for a motorcycle, Fig. 3 is a cross-sectional front view showing the V-belt fitted with the block; The figure is a cross-sectional side view, FIG. 5 is a cross-sectional view showing the state of engagement between the variable diameter transmission V-pulley and the V-belt, and FIG. 6 is an explanatory view showing the state of engagement between the teeth of the V-belt and the teeth of the sprocket. 21... Drive shaft 22... Drive side variable diameter transmission V
Pulley 23... Fixed pulley half 24... Movable pulley half 25... Sprocket 25a.
... Sprocket l! 29... ■-shaped annular groove 30... V-belt 36... Driven shaft 37...
- Driven side variable diameter transmission pulley 41... Fixed pulley half 42... Sprocket 42a... Sprocket tooth 44... Movable pulley half 47...
V-shaped annular groove 56...Endless belt 56
a...Belt tooth 57...■Block 57
a, 57b... Inclined surface patent Applicant Honda Motor Co., Ltd. Procedural Amendment October 18, 1980 Commissioner of the Patent Office Manabu Shiga 2 Title of the invention ■ Belt transmission device 3 Person making the amendment Relationship to the case Patent applicant (532) Honda Motor Co., Ltd. 4, agent 5, date of amendment order voluntarily submitted 6, number of inventions increased by amendment. (1) Corrected [belt IIMJ] in lines 8 and 12 of page 19 to “belt pitch”, and corrected [belt engagement length and sprocket pitch] in lines 9 to 12 of the same page. The meshing circumference is PG Xni : pl In the same book, page 21, line 8, "if prepared" is corrected to "even if prepared."

Claims (1)

[Scope of Claims] 1. In a V-belt transmission device that transmits the rotation of the drive shaft to the driven shaft via a V-belt that frictionally engages variable diameter transmission V pulleys provided on the drive shaft and the driven shaft, respectively, the The variable diameter transmission V pulley for the drive shaft and driven shaft has a fixed pulley half that is fixed to the drive shaft or the driven shaft and a movable pulley half that is movable in the axial direction of the drive shaft or the driven shaft. A gear member is provided between the fixed pulley half and the movable pulley half on at least one of the variable diameter transmission V pulleys of the shaft, and the V belt is formed on both sides by the fixed pulley half and the movable pulley half. an outer circumferential surface of an endless belt having an inclined surface that frictionally engages with a V-shaped annular groove; a V block having an opening formed in the inner circumferential surface thereof; and a tooth portion that meshes with the teeth of the gear member on the inner circumferential surface. 1. A V-belt transmission device, characterized in that the V-belt is configured to fit continuously in the longitudinal direction and is installed between variable-diameter transmission V-pulleys of the drive shaft and the driven shaft. 2. The V-belt transmission device according to claim 1, wherein the gear member is provided on either one of the variable diameter transmission V pulley of the drive shaft or the driven shaft. 3. The V-belt transmission device according to claim 1, wherein the gear member is provided on both variable diameter transmission V pulleys of the drive shaft and the driven shaft, respectively.