JPH0763244A - Transmission gear - Google Patents

Abstract

PURPOSE:To enable normal rotation and reverse rotation to be transmitted by means of a transmission gear having a small number of parts, and miniaturized and lightened, and also to enable a clutch to be lightly released even under its loaded state by sliding a clutch cone rightward and leftward while torsinally rotating it in relation to the shaft. CONSTITUTION:When an operation lever 25 is operated as shown by the solid line figure, an arm 24 is moved leftward through a shaft 23, and a ball bearing 19 is pushed leftward by a plate spring 21, thereby a clutch cone 17 is also moved leftward with the ball bearing 19, and the taper-like left end 17a is fitted into a retainer. When an input shaft 11 is rotated in the direction of the arrow mark C in this state, a gear 10 to be meshed with a pinion 12 is rotated in the direction of the arrow mark D, and also a bevel gear 6 integrated with this gear 10 is also rotated in the direction of the arrow mark D. And an outer race 14 fitted to the bevel gear 6 is also rotated in the direction of the arrow mark D, moreover the retainer is also rotated in the direction of the arrow mark D, thereby this retainer is locked on the taper-like end 17a of the clutch cone 17 by the action of a roller 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission device capable of switching between forward rotation and reverse rotation, and is suitable for a transmission system of a model engine for radio control.

[0002]

2. Description of the Related Art The applicant of the present invention has previously disclosed, as a transmission device for a model engine for radio control, Japanese Patent Laid-Open No. 4-1534.
Although a friction type continuously variable transmission disclosed in Japanese Patent No. 8 has been proposed, in this apparatus, continuously variable transmission and reverse rotation transmission are performed by a continuously variable transmission and a differential device.

In the above-mentioned device, the forward rotation and the reverse rotation transmission are performed by operating the continuously variable transmission and the differential device. However, the radio controlled model engine itself has a wide range of rotation speeds (for example, 2000 by throttle control). ~ 18000r.
It has been found that the continuously variable transmission described above does not have to be included in the transmission system of the model engine for radio control, as long as it can perform forward and reverse transmission.

For this reason, the applicant of the present invention has previously disclosed Japanese Patent Laid-Open No. 5-18.
As No. 8033, rotating bodies are provided on both sides of the shaft,
Outer races, each of which has an inner peripheral surface formed in a tapered hole shape, are provided on the opposite sides of the two rotating bodies, and a large number of rollers are tilted at a shallow angle with respect to the shaft so that they can be freely rotated in a ring-shaped retainer. A hollow cylindrical clutch cone formed by fitting the fitted one into the outer race and forming a tapered shape with both ends tightly fitted in the retainer is provided on the shaft between the left and right retainers. We applied for a transmission that was designed to rotate with it and move to the left and right.

[0005]

SUMMARY OF THE INVENTION In the transmission device of the above-mentioned prior application, a large number of rollers are rotatably fitted in a ring-shaped retainer in a state in which they are inclined at a shallow angle with respect to the shaft. A hollow cylindrical clutch cone, which is fitted into the outer races of the left and right rotating bodies and has a tapered shape in which both ends are tightly fitted in the retainer, is provided on the shaft between the left and right retainers. The ones provided so as to rotate together and move to the left and right each act as a one-way clutch.

That is, when the clutch cone is moved to either one along the axis and its tapered end is tightly fitted in the retainer, when the roller in the retainer is viewed as a screw thread, It acts as a one-way clutch in which the clutch is in contact with the rotation such that the retainer is screwed into the inner part of the outer race, and the clutch is disengaged in the rotation opposite thereto.

Further, since the rotating bodies which rotate in opposite directions are arranged to face each other on the shaft of the device of this prior application, the rotation of the rotating body fitted with the clutch cone of the one-way clutch is transmitted to the shaft. In this case, the forward / reverse rotation can be easily taken out by operating the clutch cone to the left or right.

As described above, in the device of this prior application, only a simple device for transmitting the forward rotation and the reverse rotation is provided instead of the continuously variable transmission and the differential device, so that the number of constituent parts is reduced and the manufacturing is easy. In addition, since it is small and lightweight, it has the effect of being suitable as a model transmission, but this clutch is in a contact state and a relatively large load is applied to this transmission system. In this case, when trying to disengage the clutch, there is a problem that there is considerable resistance and it is difficult to disengage the clutch.

[0009]

In order to solve the above-mentioned problems, in the present invention, rotating bodies are provided on both sides of the shaft, and the inner peripheral surfaces of the rotating bodies are tapered so that their inner peripheral surfaces face each other. The outer race thus formed is provided, and in a state where a large number of rollers are tilted at a shallow angle with respect to the shaft, a rotatably fitted ring-shaped retainer is fitted into the outer race, and both ends are In a clutch mechanism provided with a hollow cylindrical clutch cone formed in a taper shape tightly fitted in the retainer, on the shaft between the left and right retainers, so as to rotate together with this shaft and move left and right, The transmission is configured so that the clutch cone slides left and right while rotating by twisting about the shaft.

Specifically, the clutch cone of the above-mentioned device may be provided with a spiral elongated hole, and the shaft may be provided with a protrusion fitting with the elongated hole. Further, the protrusion may be provided inside the clutch cone. The shaft may be provided with a spiral groove that fits with the protrusion.

[0011]

As described above, according to the present invention, the clutch cone slides while twisting and rotating on the shaft. Therefore, when the clutch cone is disengaged, if the clutch cone is slid in one direction and slid, the clutch cone may become a clutch. Even when torque is applied, it is light and you can easily disengage the clutch. In this case, it is desirable that the twist pitch angle of the clutch cone is approximately the same as the twist angle of the roller in the retainer that fits with the clutch cone.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. In the drawings, reference numeral 1 denotes a box-shaped case body, and the case body 1 includes a case 1a and a case 1 as shown in FIGS.
It is divided into two parts.

In this embodiment, the output shaft 2 is provided rotatably through the case 1 through the bearings 3 and 4. 5 is a stop ring. Bevel gears 6 and 7 are rotatably provided on both sides of the output shaft 2 in the case 1, respectively. 6a ~
Reference numeral 7a is a bearing for the bevel gears 6,7. Bevel gear 6 is bevel gear 7
A bevel gear 8 that has the same diameter as that of the bevel gear 6 and 7 and that meshes with the bevel gears 6 and 7 is rotatably provided on a shaft 9 projecting from the case body 1. Reference numeral 8a is a bearing of the bevel gear 8.

A gear 10 having a diameter larger than that of the bevel gear 6 is formed integrally with the bevel gear 6, and the gear 10 has a part of its teeth outside the opening 1c of the case body 1 as shown in FIGS. So that it projects toward you.

Reference numeral 11 (see FIGS. 1 and 2) is an input shaft provided outside the case body 1 in parallel with the output shaft 2. A pinion 12 fixed to the input shaft 11 is meshed with the gear 10. . Reference numeral 13 is a pin for fixing the pinion 12 and the shaft 11. Further, as shown in FIG. 4, the outer race 14 having the inner peripheral surface 14a formed in the shape of a tapered hole toward the inner side is fitted into the holes 6b and 7b provided on the opposite sides of the bevel gears 6 and 7, respectively.

Further, a large number of rollers 15 (see FIG. 5) are rotatably fitted in the ring-shaped retainer 16 in a state of being inclined by a shallow angle θ _{1 with} respect to the axis CL of the output shaft 2. , Are fitted into the outer races 14, respectively.

Further, both ends 17a and 17b of the hollow cylindrical body are formed in a tapered shape so as to be closely fitted in the retainer 16, and the shaft center line C of the output shaft 2 is provided on both sides in the middle of the body portion.
The clutch cone 17 is formed by providing a long hole 17c inclined by a shallow angle θ _{2 with} respect to L.
Is fitted to the output shaft 2 between the left and right retainers 16, and the pin 18 is passed through the output shaft 2 through the elongated hole 17c to rotate the clutch cone 17 together with the output shaft 2. At the same time, the long hole 17c is allowed to move right and left by an amount allowed. The inclination angle is preferably θ ₁ = θ ₂ .

As a device for moving the clutch cone 17, a ball bearing 19 is fitted to the outer periphery of the clutch cone 17 so as to cover the elongated hole 17c of the clutch cone 17, and the stop ring 20 is attached to the ball bearing 19.
The ball bearings 19 are positioned by fitting the clutch cones 17 on both sides of the inner race.

A partition wall 1d (see FIGS. 1 and 4) protruding inward is provided in the middle of the case body 1, and the base portion 21a of the leaf spring 21 is fixed to the partition wall 1d by a bolt 22 as shown in FIG. The free end portion 21b of the leaf spring 21 is brought into contact with the right side surface of the ball bearing 19 in FIG. 4 so that the clutch cone 17 is constantly pushed to the left via the ball bearing 19.

As shown in FIGS. 1 and 4, the case body 1
The shaft 23 is vertically inserted from above, the base portion 24a of the arm 24 is fixed to the intermediate portion of the shaft 23, and the free end portion 24b of the arm 24 is brought into contact with the left side surface of the ball bearing 19. Reference numeral 25 is an operation lever fitted to the upper protruding end of the shaft 23.

7 and 8 show another embodiment, in which long grooves 2a inclined by a shallow angle θ _{2 with} respect to the axis CL are provided on both sides of the peripheral surface of the output shaft 2. A projection 17d is slidably fitted on the inner peripheral surface of the clutch cone 17 so as to be slidably fitted in the long groove 2a.

Next, the operation of the device of the present invention configured as described above will be described. When the operating lever 25 is operated to the state shown by the solid line in FIG. 1, the arm 24 moves to the left side in FIG. 1 via the shaft 23, so that the ball bearing 19 is pushed to the left side by the leaf spring 21. Together with the bearing 19, the clutch cone 17 also moves to the left side in the figure, and the tapered left end 17a is fitted into the retainer 16.

In this state, as shown in FIG. 2, the input shaft 11
When is rotated in the direction of arrow C, the gear 10 meshing with the pinion 12 rotates in the direction of arrow D, and the bevel gear 6 integrated with this gear 10 also rotates in the direction of arrow D.

When the bevel gear 6 rotates in the direction of arrow D, the outer race 14 fitted to the bevel gear 6 also rotates in the direction of arrow D, and as a result, the retainer 16 also moves in the direction of arrow D.
Since the retainer 16 rotates in the direction of
The action of 5 locks the tapered end 17a of the clutch cone 17. That is, since the clutch is engaged, in the embodiment of FIGS. 5 and 6, the output shaft 2 outputs the forward rotation indicated by the arrow D through the clutch cone 17, the elongated hole 17c, and the pin 18.

In the case of the embodiment shown in FIGS. 7 and 8, the projection 17d of the clutch cone 17 and the long groove 2a of the output shaft 2 are provided.
The forward rotation in the direction of arrow D is transmitted from the clutch cone 17 to the output shaft 2 by the engagement with.

In this case, the rotation of the bevel gear 6 causes the bevel gear 7 to rotate through the bevel gear 8 in the direction of arrow E as shown in FIG. 3, but the clutch on the bevel gear 7 side is in the disengaged state. Therefore, the bevel gear 7 only idles.

Next, when the operating lever 25 is operated as shown by the chain double-dashed line diagram in FIG. 1, the ball bearing 19 is pushed by the arm 24 as shown by the arrow F in FIG.
The clutch cone 17 moves to the right side in FIGS. 1 and 6 to engage the clutch on the bevel gear 7 side and disconnect the clutch on the bevel gear 6 side.

In this state, when the rotation in the direction of arrow C in FIG. 2 is input to the input shaft 11, the bevel gear 7 is moved in the direction of arrow E in FIG. 3 via the pinion 12, the gear 10, the bevel gears 6 and 8. Rotate. When bevel gear 7 rotates in the direction of arrow E, output shaft 2 rotates in the direction of arrow E via the clutch on the side of bevel gear 7. That is, in this case, the output shaft 2 outputs reverse rotation.

The apparatus of the present invention constructed as described above is shown in FIG.
As shown in FIG.
The output shaft 2 is the one that is rotatably fitted in the ring-shaped retainer 16 in a state of being inclined at a shallow angle θ _{1 with} respect to L.
The hollow cylindrical clutch cone 17 formed into a taper shape, which is fitted into the outer race 14 in the left and right bevel gears 6 and 7 and whose both ends 17a and 17b are tightly fitted in the retainer 16, The one provided on the output shaft 2 between the left and right retainers 16 so as to rotate together with the output shaft 2 and move left and right functions as a one-way clutch.

That is, this clutch moves the crunch cone 17 to either one along the output shaft 2,
With the tapered ends 17a and 17b closely fitted in the retainer 16, when the roller 15 in the retainer 16 is viewed as a screw thread, the retainer 16 is screwed into the inner portion of the outer race 14 so as to rotate. The clutch is in contact with, and the clutch acts as a one-way clutch in the opposite rotation.

Further, since bevel gears 6 and 7 which rotate in opposite directions are arranged to face each other on the output shaft 2 of the device of the present invention, the rotation of the gear in which the clutch cone 17 of the one-way clutch is fitted is output shaft. If it is transmitted to No. 2, forward / reverse rotation can be easily taken out by operating the clutch cone 17 to the left or right.

[0032]

As described above, the device of the present invention is provided with only a simple device for transmitting the forward rotation and the reverse rotation, instead of the continuously variable transmission and the differential device. Since the number of constituent parts of the device is reduced to facilitate manufacture, and the device is small and lightweight, it is possible to obtain an effect of being suitable as a model transmission device.

Also according to the invention, the clutch cone 17
Since it slides on the shaft 2 while twisting and rotating, if the clutch cone 17 is twisted and slid in one direction when the clutch is disengaged, the clutch cone is light even when torque is applied to the clutch, and the clutch is easily disengaged. The effect that can be obtained is obtained.

[Brief description of drawings]

FIG. 1 is a plan sectional view of a first embodiment of the device of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG.

FIG. 4 is an elevation view showing a case main body of the apparatus of FIG. 1 with a part thereof cut away.

FIG. 5 is a side view showing the clutch device of FIG. 1 in an exploded manner.

FIG. 6 is an operation explanatory view of a clutch cone.

FIG. 7 is a side view showing an exploded view of another embodiment of the clutch device.

FIG. 8 is a plan view showing a state where FIG. 7 is viewed from above.

[Explanation of symbols]

1 Case main body (case) 2 Output shaft 3,4 Bearing 5 Stop ring 6,7,8 Bevel gear 9 Shaft 10 Gear 11 Input shaft 12 Pinion 13 Pin 14 Outer race 15 Roller 16 Retainer 17 Clutch cone 17a, 17b Tapered Formed end (both ends) 17c Long hole 18 pin CL Output shaft axis θ ₁ , θ ₂ Angle of inclination with respect to axis CL 19 Ball bearing 20 Stop ring 21 Leaf spring 22 Bolt 23 Shaft 24 Arm 25 Operation lever

Claims (3)

[Claims] 1. A rotary body is provided on each of both sides of the shaft, and outer races each having an inner peripheral surface formed into a tapered hole are provided on opposite sides of the rotary body, and a large number of rollers are shallow with respect to the shaft. A hollow cylindrical clutch that is rotatably fitted in a ring-shaped retainer in an inclined state, is fitted in the outer race, and has both ends tightly fitted in the retainer. In a clutch mechanism provided on the shaft between the left and right retainers so as to rotate together with the shaft and move to the left and right, the clutch cone is twisted about the shaft and slides to the left and right. The transmission device characterized in that 2. The transmission according to claim 1, wherein the clutch cone is provided with a spiral long hole, and the shaft is provided with a protrusion for fitting with the long hole. 3. A transmission device, characterized in that a protrusion is provided inside the clutch cone according to claim 1, and a spiral groove that fits with the protrusion is provided on the shaft.