JP2002130325A - Clutch device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make possible a reduction of friction between a casing and an internal gear, whereby a satisfactory ON/OFF operation of a clutch device can be realized. SOLUTION: A recess 11a is formed in a casing 11, balls 75 are arranged in the recesses 11a, and the internal gear 74 is supported on the casing 11 through the balls 75.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clutch device in which power is transmitted to a planetary gear by stopping an internal gear and the power is not transmitted by making the internal gear rotatable.

[0002]

2. Description of the Related Art For example, Japanese Unexamined Utility Model Publication No. Sho 60-40931, entitled "Planetary Gear Reducer" is known as a mechanism having a sun gear, a planetary gear and an internal gear as constituent elements. This is a mechanism using a gear having the same configuration as that of FIG. According to FIG. 1 of the publication, a sun gear 8 (sun gear) is mounted on a driving shaft 1, a plurality of planet gears 4 (planetary gears) are meshed with the sun gear 8, and A planetary gear reducer in which a large-diameter internal gear outer ring 6 (internal gear) is meshed with a planetary gear 4 supported by a support frame 3, a driven shaft 2 is attached to the support frame 3, and a plurality of In this structure, the shoes 15 are formed, and the large-diameter internal tooth outer ring 6 is supported by these shoes 15.

[0003]

In the clutch device including the planetary gear 4, the large-diameter internal gear outer ring 6 and the sun gear 8, the power is supplied to the planet gear 4 by stopping the large-diameter internal gear outer ring 6. This is a device for transmitting power by making the large-diameter internal tooth outer ring 6 rotatable. When the friction between the case 9 and the large-diameter internal tooth outer ring 6 is large, the large-diameter internal tooth outer ring 6 is moved. Despite the rotation, the power is transmitted to the planetary gear 4 side, and the driven shaft 2 rotates. This phenomenon impairs the performance of the clutch and is not desirable. Therefore, a technique capable of reducing the friction between the large-diameter internal gear outer ring 6 (internal gear) and the case 9 (casing) is desired.

An object of the present invention is to provide a technique capable of reducing the friction between a casing of a clutch device and an internal gear.

[0005]

In order to achieve the above object, a first aspect of the present invention is to mesh a sun gear with a planetary gear, mesh a planetary gear with an internal gear, and connect the sun gear, the planetary gear and the internal gear to a casing. The internal gear is housed, and a brake is attached to the internal gear.The brake transmits the power from the sun gear to the planetary gear by making the internal gear stationary, and releases the brake to make the internal gear rotatable. Is characterized in that a concave portion is formed in the casing, a rolling member is disposed in the concave portion, and the internal gear is supported on the casing via the rolling member.

In a clutch device having a sun gear, a planetary gear, and an internal gear as components, a power is transmitted from the sun gear to the planetary gear by making the internal gear stationary by a brake, and the power is transmitted by releasing the brake. To a non-communication state. Therefore, when the friction between the casing and the internal gear is large, power is transmitted to the planetary gear side despite the fact that the external gear is rotatable. Therefore, a recess is formed in the casing, a rolling member is arranged in the recess, and the internal gear is supported on the casing via the rolling member, thereby reducing friction between the casing and the internal gear. .

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Note that "before", "after",
“Left”, “right”, “up”, and “down” follow the direction as seen from the operator, and Fr indicates the front side, Rr indicates the rear side, L indicates the left side, and R indicates the right side. Also, the drawings should be viewed in the direction of reference numerals.

FIG. 1 is a perspective view of a management machine equipped with a clutch device according to the present invention, wherein 10 is a management machine, 17 is a tilling shaft,
18 ... (... indicates a plurality; the same applies hereinafter) indicates tillage claws, 1
9 and 19 are disks, 21 is a handle post, and 23 and 2
4 is a left / right handle, 31 is a mudguard plate, 32 is a protector, 33 is a side cover, 61 is an engine cover, 35 is a fuel tank integrally formed with the engine cover 61, 36 is a tank cap, and 60 is a tank cap. A recoil starter, 62 is a housing of the recoil starter 60, 65 is a rope of the recoil starter 60, and 66 is a lever of the recoil starter 60. Reference numeral 70 denotes a clutch device according to the present invention. As will be described later, the clutch device 70 is a device in which consideration is given to reducing friction between the casing 11 and the internal gear 74.

FIG. 2 is a side view of a management machine provided with the clutch device according to the present invention. The management machine 10 includes a casing 11 corresponding to a chassis of the vehicle body, an engine 12 mounted on the casing 11, and a clutch device 7 attached to the engine 12.
0, a pinion 15 attached to the tip of the drive shaft 14, a bevel gear 16 meshed with the pinion 15, and a rotatable attachment to the casing 11 while being fitted to the bevel gear 16. The cultivating shaft 17, a plurality of cultivating claws 18 attached to the cultivating shaft 17 (only the locus of the cultivating claw 18 is shown in the figure), and the discs 19, 1 attached to both ends of the cultivating shaft 17.
9 (the back side 19 is not shown), and the rotation of the engine 12 is controlled by the clutch device 70 and the drive shaft 1.
4. Tilling shaft 17 via pinion 15 and bevel gear 16
This is a walking type self-propelled cultivator that can move forward while tilling the soil by telling it to. In addition, disk 1
9 and 19 are protectors for preventing the soil to be plowed from escaping to both sides.

Further, the management machine 10 includes a handle post 21 extending rearward by being attached to the casing 11,
A resistance rod 22 mounted in the middle of the handle post 21
And left and right handles 23 and 24 attached to the tip of the handle post 22, left and right grips 25 and 26 attached to the tips of the handles 23 and 24, and these grips 25 and 26, respectively. It is provided with left and right clutch levers 27, 28 provided. By operating one of these clutch levers 27, 28, the clutch device 70 can be operated, and the cultivator (management machine 10) The purpose is to improve the convenience of the system.

When the soil is tilled with the tilling nails 18, the resistance rod 22 is inserted into the soil to set the depth of cultivation by the tilling nails 18. It can be said that it plays a role of adding a resistance to traction force and is a key member of a tilling operation.

The management machine 10 includes a mudguard plate 31 between the casing 11 and the engine 12 and a protector 32 in front of the casing 11. The protector 32 serves as a front bumper. The protector 32 serves as a fender. The engine 12 includes a side cover 33, an engine cover 61, and a recoil starter 60.
Of the side cover 33, the engine cover 61 and the housing 62.
Is a member having a function similar to that of a cowling when a motorcycle is taken as an example.

FIG. 3 is a side view of the engine of the management machine provided with the clutch device according to the present invention. The engine 12 includes a crankcase 41 made of an aluminum alloy, a cylinder block 42 that is bolted to the crankcase 41 via a gasket (not shown), a cylinder 43 formed in the cylinder block 42, and a cylinder 43. A piston 44 to be slid and a crankshaft 4 connected to the piston 44 via a piston rod 45
6 is a main component, 47 is a spark plug, 4
8, a valve; 49, a head cover; 52, a flywheel; 53, a cup-shaped member attached to the flywheel 52 for rotating the crankshaft 46 with the recoil starter 60 when the engine 12 is started;
Is a claw formed on the cup-shaped member.

The recoil starter 60 is a unit for starting the engine 12 (see FIG. 3) attached to the engine cover 61, and includes a housing 62 as a base.
And a reel 63 rotatably mounted on the housing.
And a mainspring that returns the reel 63 to the initial state by being interposed between the housing 62 and the reel 63 (po
wer spring) 64 and rope 6 wound around reel 63
5, a lever 66 attached to the end of the rope 65, a set screw 67 for fixing the reel 63 to the housing 62, and a one-way clutch 68 formed on the engine 63 side of the reel 63.

FIG. 4 is a sectional view taken along line 4-4 of FIG. The clutch device 70 is
A sun gear 72 attached to the crankshaft 46, a planetary gear assembly 73 meshing with the sun gear 72, an internal gear 74 meshing with the planetary gear assembly 73, and a sun gear 72, a planetary gear assembly 73 and the internal gear 7;
4 and three balls 75... (Only one is shown) as rolling members interposed between these casings 11 and the internal gear 74.
And a brake 76 for locking / unlocking the internal gear 74.

The planetary gear assembly 73 includes three planetary gears 77... (Only two are shown) that mesh with the sun gear 72 and the internal gear 74, and a planetary gear that rotatably supports these planetary gears 77. The planetary frame 78 is provided with a joint 79 at the center of which the drive shaft 14 described above is fitted.

The internal gear 74 includes a tooth portion 74a that meshes with the planetary gears 77, and a cylindrical portion 74 that applies a brake 76.
b, and the cylindrical portion 74b plays the role of a brake drum. The ball 75 (only one is shown) is provided in the casing 11 with the concave portion 11a (only one is shown).
And the casing 11 supports the internal gear 74 by being placed in these recesses 11a.

FIG. 5 is a plan view of a clutch device according to the present invention. The brake 76 includes an anchor pin 81 attached to the casing 11, a pair of brake shoes 82, 82 supported by the anchor pin 81, and a pair of these brake shoes 8.
2, 82, a lever 84 connected to the operation cam 83, and a tension spring 85
And a cable 86 connected through the cable.

The brake shoes 82, 82 have return springs 87, 87 for urging them to attract each other, and brake pads 88, 88 for locking the internal gear 74. The management machine 10 (see FIG. 1) branches the cable 86 into two operation cables 93 and 94 via a connection mechanism 91, and connects these operation cables 93 and 94 to the left and right clutch levers 27 and 28. As described above, both the left clutch lever 27 and the right clutch lever 28 enable the ON / OFF operation of the clutch device 70. That is, by operating the left and right clutch levers 27 and 28 as shown by the arrow a, the cable 8
6 is pulled as shown by an arrow b, and the lever 84 is rotated as shown by an arrow c to perform ON / OFF operation of the clutch device 70.

The clutch device 70 meshes planet gears 77 with the sun gear 72, meshes an internal gear 74 with these planet gears 77, and sets the sun gear 72, the planet gears 77, and the like. The gear 74 is housed in the casing 11, and a brake 76 is attached to the internal gear 74, and the internal gear 74 is stopped by the brake 76 to transmit power from the sun gear 72 to the planet gears 77. 7
In the clutch device in which power is not transmitted by releasing the inner gear 74 by releasing the inner gear 6, concave portions 11a are formed in the casing 11, and the concave portions 11a are formed.
Are arranged on the casing 11 and the internal gear 74 is supported on the casing 11 via these balls 75.

In the clutch device 70 having the sun gear 72, the planet gears 77,... And the internal gear 74 as components, the sun gear 7
2 to the planet gears 77.
Is released so that the power is not transmitted to the planet gears 77. Therefore, when the friction between the casing 11 and the internal gear 74 is large, power is transmitted to the planetary gear assembly 73 despite the fact that the internal gear 74 is rotatable.

Therefore, the casing 11 has recesses 11a.
Are formed, and balls 75 are arranged in these recesses 11a.
To support the internal gear 74, so that the casing 1
1 and the internal gear 74 can be reduced in friction. As a result, a favorable ON / OFF operation of the clutch device 70 can be realized. Next, a detailed operation of the clutch device 70 will be described.

FIGS. 6A and 6B are explanatory views of the operation of the clutch device according to the present invention. In (a), the internal gear 74 is locked by brake shoes 82, 82 indicated by outline arrows. By rotating the sun gear 72 as shown by the arrow, the planet gears 77... Rotate as shown by the arrow. Internal gear 7
4 is locked, so the planet gears 77
, And the planetary gear assembly 73 rotates as shown by the arrow. That is, power can be transmitted to the drive shaft 14 fitted to the planetary frame 78.

In FIG. 2B, the internal gear 74 is unlocked by the brake shoes 82, 82 indicated by white arrows. By rotating the sun gear 72 as shown by the arrow, the planetary gear 7 is rotated.
7 rotate as arrows. Since the internal gear 74 is free, the planet gears 77... Rotate as indicated by arrows and rotate the internal gear 74 as indicated by arrows. Therefore,
Since the planetary frame 78 of the planetary gear assembly 73 does not rotate, power is not transmitted to the drive shaft 14.

The operation of the clutch device 70 described above will now be described. 7 (a) and 7 (b) are explanatory views of the operation of the clutch device according to the present invention, where (a) shows a comparative example,
(B) shows an embodiment. In (a), in the clutch device 100 of the comparative example, the casing 101 and the internal gear 102 are in sliding friction. When the sliding friction is large, power is generated despite the internal gear 102 being rotatable. The drive shaft 104 is transmitted to the planetary gear assembly 103. This phenomenon impairs the performance of the clutch device 100 and is not preferable.

In (b), the clutch device 7 of the embodiment
Numeral 0 denotes rolling friction between the casing 11 and the internal gear 74, and the friction is small. Therefore, the friction between the casing 11 and the internal gear 74 can be reduced. As a result, a favorable ON / OFF operation of the clutch device 70 can be realized.

In the embodiment, as shown in FIG. 4, the ball 75 is interposed between the casing 11 and the internal gear 74. However, the present invention is not limited to this, and a rolling member such as a tapered roller or a needle may be used. Is also good. Further, in the embodiment, as shown in FIG. 4, the ball 75 is interposed between the lower surface of the internal gear 74 and the casing 11. However, the present invention is not limited to this. Rolling members may be interposed between them. That is, the invention is not limited to the one in which the rolling member is interposed in the thrust direction of the internal gear,
It may be interposed in the radial direction of the internal gear.

[0028]

According to the present invention, the following effects are exhibited by the above configuration. Claim 1 meshes a planetary gear with a sun gear,
The internal gear is meshed with the planetary gear, the sun gear, the planetary gear and the internal gear are housed in a casing, and a brake is attached to the internal gear. In a clutch device that transmits power and releases the brake to make the internal gear rotatable so that the power is not transmitted, a recess is formed in the casing, and a rolling member is disposed in the recess, and the rolling member is disposed in the recess. Since the internal gear is supported on the casing via the moving member, the friction between the casing and the internal gear can be reduced. As a result, good ON / O of the clutch device is achieved.
FF operation can be realized.

[Brief description of the drawings]

FIG. 1 is a perspective view of a management machine provided with a clutch device according to the present invention.

FIG. 2 is a side view of a management machine provided with the clutch device according to the present invention.

FIG. 3 is a side view of an engine of a management machine having the clutch device according to the present invention.

FIG. 4 is a sectional view taken along line 4-4 of FIG. 1;

FIG. 5 is a plan view of the clutch device according to the present invention.

FIG. 6 is a diagram illustrating the operation of the clutch device according to the present invention.

FIG. 7 is a diagram illustrating the operation of the clutch device according to the present invention.

[Description of Signs] 11 ... casing, 11a ... concave portion, 70 ... clutch device, 72 ... sun gear, 74 ... internal gear, 75 ... rolling member (ball), 76 ... brake, 77 ... planetary gear.

Claims (1)

[Claims] 1. A sun gear is meshed with a planetary gear, a planetary gear is meshed with an internal gear, the sun gear, the planetary gear and the internal gear are housed in a casing, and a brake is attached to the internal gear. A clutch device that transmits power from the sun gear to the planetary gear by bringing the gear into a stationary state, and releases the brake to make the internal gear rotatable so that the power is not transmitted. And a rolling member is disposed in the recess, and the internal gear is supported by the casing via the rolling member.