JPH08219251A - Driving force transmission mechanism - Google Patents

Abstract

PURPOSE: To eliminate the breakage of a gear and to reduce failures in making a switching from the forward rotation to the reverse rotation, or vice versa, by providing a stopper means to prevent the rotation of a pivotably supported plate by the external force. CONSTITUTION: When a solenoid is energized and a stopper means 8 is brought into slidable contact with the outer circumferential surface of a pivotably supported plate 3, an engagement projection 3b of the rotating pivotably supported plate 3 is abutted on the tip of the stopper means 8 to prevent the pivotably supported plate 3 from being rotated. When the pivotably supported plate 3 is stopped, a clutch 5 is stopped, and at the same time, a locking member of the clutch 5 is returned to release the engagement of the locking member of the clutch 5 with a projection 6c in a clutch housing 6. On the other hand, the rolling of a planetary gear 4 becomes impossible, and the planetary gear is only subjected to its rotation. As a result, a ring gear 6a engaged with the planetary gear 4 is rotated by the planetary gear 4 at the speed corresponding to the gear ratio of a sun gear 2 to the planetary gear 4 in the reverse direction to the sun gear 2. A traveling toy is in the reversely traveling condition through an output shaft 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is connected between an output shaft of an engine, such as a model internal combustion engine, which is difficult to rotate in the normal direction, and a load such as a wheel of a model automobile, and the load is applied in the forward and reverse directions. The present invention relates to a driving force transmission mechanism for rotating a vehicle.

[0002]

2. Description of the Related Art As a conventional mechanism for transmitting an engine output, which is difficult to reversely rotate in an internal combustion engine or the like, to normal and reverse rotations and transmitting it to a load such as a wheel, a gear is attached to a shaft arranged through an idler gear, and a gear is a solenoid or the like. There has been one in which the load is reversed by sliding the gears to engage with each other and interposing one gear.

[0003]

By the way, in the above-mentioned conventional mechanism, if one gear is engaged and the reverse rotation operation is performed during the forward rotation, the gear may be damaged or the like may be damaged. There are problems that the number of occurrences increases and the structure becomes complicated, so that the cost becomes high and the miniaturization design is very difficult.

The present invention is intended to solve the above-mentioned problems, and an object of the present invention is not to damage a gear at the time of switching from normal rotation to reverse rotation and from reverse rotation to normal rotation, and has a simple structure. It is an object of the present invention to provide a driving force transmission mechanism capable of reducing cost and downsizing, and switching from normal rotation to reverse rotation by stopping a part of the mechanism.

[0005]

The driving force transmission mechanism of the present invention is intended to achieve the above-mentioned object.
A sun gear fixed to the tip of an input shaft that is rotated by the driving force of a driving source, a plurality of planet gears that mesh with the sun gear, and one end of the rotation shaft of each planet gear through which the rotation shaft is inserted. A gear shaft support plate for supporting the shaft of the planetary gears, a centrifugal clutch in which the other shafts of the planetary gears are supported, and the locking members are projected outward by a centrifugal force by rotating at high speed, and the planetary gears. A clutch housing in which a ring gear with which is engaged and a locking surface for contacting the locking member of the centrifugal clutch are formed, and an output shaft is projected,
And a stopper means for preventing the rotation of the shaft support plate by an external force.

[0006]

In the driving force transmission mechanism of the present invention configured as described above, when the load applied to the output shaft is small and the rotation speed of the input shaft is small, even if the sun gear is rotated by the input shaft, the planetary gears are rotated. When the clutch housing rotates at the same speed as the sun gear without rotating the gear and the load applied to the output shaft is large, the planet gears rotate in the clutch housing in the circumferential direction with respect to the sun gear and the output shaft Does not rotate.

Further, when the rotational speed of the input shaft increases and the engaging member of the clutch projects outward and engages with the clutch housing, the clutch housing is moved in the rotational direction of the input shaft even if the load of the output shaft is large. And the output shaft rotates in the same direction as the input shaft.

Further, when the rotation of the shaft support plate is forcibly stopped by the stopper means, the rotation of the clutch is stopped,
At the same time, the clutch locking member returns, the clutch locking member is disengaged from the clutch housing, and the planetary gear rotates in the opposite direction to the input shaft on the fixed shaft support plate.
The clutch housing rotates in the direction opposite to the rotation direction of the input shaft, and the output shaft rotates in the direction opposite to the input shaft.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the driving force transmission mechanism according to the present invention will be described below with reference to FIGS. Reference numeral 1 is an input shaft connected to a drive source such as an internal combustion engine that is difficult to rotate in reverse, 2 is a sun gear fixed to the tip of the input shaft 1, and 3 is a hole 3a through which the input shaft 1 is inserted. In addition, a shaft support plate 4 having a locking projection 3b formed at one location on the outer periphery is a plurality of planet gears (three in the figure are shown) that mesh with the sun gear, and the rotation shaft of each planet gear 4 is rotated. One end of is supported by the shaft support plate 3.

A locking member 5a is pivotally supported at one end on the ring-shaped outer periphery of the ring 5. When the rotation speed is low, the spring housed inside does not cause the locking member 5a to project from the outer peripheral surface and the rotation speed increases. The other end of the rotation shaft of the planetary gear is rotatably supported on one ring-shaped surface of the centrifugal clutch in which the engaging member 5a projects from the outer peripheral surface against the spring force of the spring by the centrifugal force.

Reference numeral 6 denotes a planetary gear 4 meshed with the sun gear 2.
And a clutch housing for accommodating the clutch 5, a ring gear 6a that meshes with the planetary gear 4 is formed on the inner peripheral surface on the opening side, and a space 6b for accommodating the clutch 5 is formed. Has been done. A projection 6c is formed on the inner peripheral surface of the space 6b to engage with the locking member 5a of the clutch 5 in a projected state, and the output shaft 7 projects from the closed portion 6d on the back surface. .

Numeral 8 is a stopper means which opposes the peripheral surface of the shaft support plate 3, for example, is attached to the vehicle body of an engine model car, and which makes a swinging motion in response to a command from the outside. The tip end portion is in contact with the peripheral surface of the shaft support plate 3 and is separated from the peripheral surface of the shaft support plate 3 when the energization of the solenoid is cut off.

In the driving force transmission mechanism of the present invention thus constructed, the sun gear 2 and the planetary gear 4 are meshed with each other, and
With the input shaft 1 inserted in the hole 3a of the shaft support plate 3, the rotation shaft of the planetary gear 4 is supported by the shaft support plate 3 and the clutch 5 so as to be integrated. Next, in this assembled state, the clutch 5 is housed in the space 6b of the clutch housing 6, and the planetary gear 4 is meshed with the ring gear 6a. In this state, the shaft support plate 3 is positioned in the opening of the clutch housing 6 in a free state.

Next, the operation when the input shaft 1 is rotated clockwise at a slow speed by the drive source and the load applied to the output shaft is small will be described with reference to FIG. When the input shaft 1 rotates, the sun gear 2 fixed to the input shaft 1
Also rotates in the same direction, so that the planetary gear 4 rotates in the opposite direction to the sun gear 2.

At this time, the output shaft 7 is more than frictional resistance between the sun gear 2 and the planet gears 4 and between the planet gears 4 and the ring gear 6a.
When the load applied to is very small, the planetary gear 4 is in a fixed state. Therefore, the rotational force of the sun gear 2 is directly transmitted to the clutch housing 6 via the planetary gear 4, and the output shaft 7 rotates in the same direction as the input shaft 1 at the same speed.

Next, a case where the load applied to the output shaft 7 is larger than the friction resistance will be described with reference to FIG. When the load is large, the planet gear 4 rotated by the sun gear 2 rolls in the ring gear 6a around the sun gear 2 in the same direction as the rotation direction. In this state,
The running toy is in a stopped state because no unreasonable torque is applied to the clutch housing 6. In any state, the clutch 5 and the shaft support plate 3 rotate in the same direction as the input shaft 1.

Next, a state in which the rotation speed of the input shaft 1 becomes extremely high and the locking member 5a of the clutch 5 is projected by centrifugal force will be described with reference to FIG. When the locking member 5a of the clutch 5 projects from the peripheral surface, the locking member 5a engages with the protrusion 6c formed in the space 6b of the clutch housing 6. Accordingly, the clutch housing 6 rotates in the same direction as the input shaft 1 and at the same speed, so that the output shaft 7 rotates at the rotation speed of the input shaft 1. Therefore, the traveling toy travels at high speed.

Next, the operation of rotating the output shaft 7 in the direction opposite to the rotating direction of the input shaft 1 will be described with reference to FIG. In this case, in response to an external command, for example, the solenoid is energized and the stopper means 8 is swung as shown by the phantom line in FIG. 2 to bring the tip into sliding contact with the outer peripheral surface of the shaft support plate 3.

When the stopper means 8 is brought into sliding contact with the outer peripheral surface of the shaft support plate 3, the engaging projection 3b of the rotating shaft support plate 3 comes into contact with the tip of the stopper means 8 to cause the shaft support plate 3 to move. Prevent rotation. When the rotation of the shaft support plate 3 is stopped, the rotation of the clutch is stopped, the locking member of the clutch is returned at the same time, and the engagement between the locking member of the clutch and the protrusion in the clutch housing is released. On the other hand, since the planet gears 4 cannot rotate, the planet gears 4 only rotate. As a result, the ring gear 6a meshed with the planetary gear 4 is rotated by the planetary gear 4 in the direction opposite to the sun gear 2 at a speed corresponding to the gear ratio between the sun gear 2 and the planetary gear 4. Therefore, the traveling toy is in the reverse traveling state via the output shaft 7.

In the above-described embodiment, the projection of the locking member 5a of the clutch 5 is controlled by the spring force of the spring. However, this is also possible by using a friction type centrifugal clutch utilizing friction force. Good.

[0021]

As described above, according to the present invention, the rotation speed of the input shaft increases, the locking member of the clutch projects outward, and the projection in the clutch housing is engaged with the output shaft so that the output shaft is connected to the input shaft. Since they rotate in the same direction, the rotation speed of the output shaft can be controlled by controlling the rotation speed of the input shaft, and thus the speed control can be easily performed.

When the rotation of the shaft support plate is forcibly stopped by the stopper means, the planet gears rotate in the opposite direction to the input shaft on the shaft support plate in the fixed state, so that the clutch housing is aligned with the rotation direction of the input shaft. Rotates in the opposite direction, so
Since the output shaft rotates in the opposite direction to the input shaft, the reverse operation can be performed with a simple structure, and the number of parts is small, so there is little risk of failure, and it is easy to downsize. Is.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a driving force transmission mechanism according to the present invention.

FIG. 2 is a perspective view showing a state in which the same is assembled.

FIG. 3 is a cross-sectional view showing an operation when the load is small.

FIG. 4 is a cross-sectional view showing an operation when a load is large.

FIG. 5 is a cross-sectional view showing an operation at high speed rotation.

FIG. 6 is a cross-sectional view showing an operation during a reverse rotation operation.

[Explanation of symbols]

 1 Input Shaft 2 Sun Gear 3 Shaft Support Plate 3b Engagement Protrusion 4 Planetary Gear 5 Clutch 5a Locking Member 6 Clutch Housing 6a Ring Gear 6c Protrusion 8 Stopper Means

Claims (4)

[Claims] 1. A sun gear fixed to a tip of an input shaft that rotates by a driving force of a driving source, a plurality of planet gears meshed with the sun gear, and the planetary gears through which the rotary shaft is inserted. A gear shaft support plate that supports one end of the rotation shaft of
A centrifugal clutch, in which the other shafts of the planetary gears are rotatably supported and rotate at a high speed so that the locking member is projected outward by a centrifugal force, and a ring gear and the centrifugal clutch in which the planetary gears are meshed. Driving force, comprising: a clutch housing having a locking surface against which the locking member of FIG. 1 abuts, the output shaft protruding, and stopper means for blocking the rotation of the shaft support plate by an external force. Transmission mechanism. 2. The driving force transmission mechanism according to claim 1, wherein the centrifugal clutch and the clutch housing are connected by contact between an engaging member of the centrifugal clutch and a locking surface of the clutch housing. . 3. The driving force transmission mechanism according to claim 1, wherein the centrifugal clutch and the clutch housing have an engagement member of the centrifugal clutch and a locking surface of the clutch housing connected by friction resistance. . 4. The driving force transmission mechanism according to claim 1, wherein the stopper means is a stopper means that is brought into contact with a locking projection protruding on an outer peripheral surface of the shaft support plate by an external operation.