JPS5929859A - Differential speed change gear - Google Patents

Abstract

PURPOSE:To provide stepless speed change without energy loss by making one rotational speed variable out of the two rotational speeds input into a differential gear and enabling stepless speed change of output rotation. CONSTITUTION:Bevel gears 6 and 7 are freely fitted to a case 2 which is fixed to a main shaft 1, and bevel gears 4 and 5 are meshed with said bevel gears 6 and 7. A worm wheel 8 integrated with the bevel gear 4 is meshed with a worm 9 integrated with a motor shaft, whie the bevel gear 5 is interlocked with an output shaft 12 through gears 10 and 11. When the number of revolution of the bevel gear 4 is varied through the worm 9 while the main shaft 1 is being rotated, the output shaft 12 is made capable of making stepless speed change.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a differential gear type differential transmission.

In general, in a transmission mechanism, when changing gears or belts, etc., the transmission capacity is temporarily cut off to change the speed, the operation is complicated and the speed change is done in stages, or when the transmission is performed through friction or fluid, If the load or resistance becomes too stiff, there is a drawback that slippage increases and energy loss increases.

The present invention eliminates ray and energy losses due to slippage by controlling the steady rotation speed of the main input shaft by controlling the rotation speed of the shaft input from a separate small variable speed motor via a differential gear device. This allows for arbitrary speed changes in stages.

The differential gear can be basically the same as a differential gear for an automobile.

What is shown in FIG. 1 and FIG. 2 shows an embodiment of the present invention, and the explanation will be based on this.

Reference numeral 1 denotes a main shaft that transmits the main input for changing gears. 2
3 is a case fixed to the main shaft 1, and 3.degree.3 is a shaft fixedly arranged near the center of the thickness of the case 2 in a straight line and perpendicular to the main shaft 1. 4, 5 and 6
, 7 is 1 whose meshing center point is the intersection of the axes 1 and 3.3.
A set of bevel gears, each slidingly fitted on a shaft, and adjacent gears meshing to form a differential gear mechanism. An arbitrary gear 8 is fixed to a bevel gear 4 fitted on the main shaft 1, and a variable speed small motor (not shown) capable of forward and reverse operation is connected to an appropriate gear mechanism 9 meshing with the arbitrary gear 8.

Reference numeral 10 denotes a gear fixed to the other 5 of the bevel teeth in ml, and meshes with a gear 11 fixed to the output shaft 12.

Bearings, etc. are omitted in the top view.

The present invention has the above-mentioned configuration, and its operating state will be explained next.

Power at a constant rotational speed is transmitted to the main shaft 1 from the driving force side. The rotation is transmitted to the output shaft 12 via the shafts 3, 3 and the bevel gear 6° 7.5 and the gear 10.11. At this time, when the bevel gear 4 is rotated and shifted by the variable speed small motor, the speed of the bevel gear 5 which is in a differential relationship with the bevel gear 4 changes and is transmitted to the output shaft 12.

In other words, by changing the speed of the variable speed small motor, the output shaft 1
The speed change is achieved by the second rotation. The rotation of the variable speed small motor is transmitted via an optional gear 8 from a suitable gear mechanism 9. In this case, the type of gear can be selected freely, but
If 8 is a worm wheel and 9 is a worm, and the rotation is automatically tightened from the worm wheel side, the variable speed small motor will not be easily affected by the rotational force of the main shaft l. Therefore, the force of the variable speed small motor is much smaller than the rotational force of the main shaft l. If possible, if you limit the range of speed change to a state in which the worm acts as a brake in the direction of the force that affects the worm, and the motor loosens the brake, then the rotational force of the variable speed small motor will be limited to the direction of the force that affects the worm. This transmission is unique in that it can shift gears with an extremely small force, less than a few tens of minutes compared to the rotational force of a motor.

[Brief explanation of the drawing]

The drawings are explanatory drawings for showing one embodiment of the present invention, and FIG. 1 shows a sectional view in the main axis direction, and FIG. 2 shows a sectional view taken along the line AA in FIG. 1. 1 Main shaft 2 Case 3.3 Axis 4.5, 6.7 Bevel gear 8 Gear 9 Gear mechanism 12 Output shaft patent applicant Shuzo Suemoto

Claims (1)

[Claims] A shaft (3°3) orthogonal to the main shaft (1) is fixed near the center of the thickness of the cake (2) fixed to the main shaft (1),
1 to the axis (1, 3, 3) with the intersection as the center of engagement
A set of bevel gears (4, 5, 6°7) is fitted, and the adjacent gears are meshed to form a differential gear mechanism, and one of the bevel gears (4) fitted to the main shaft (1) is fitted with an arbitrary gear. Fix the gear (8) of
A variable speed small motor is connected to a suitable gear mechanism (9) that meshes with the gear (8), and the output horn shaft (12) can be driven from the other bevel gear (5) through any transmission mechanism. Thus, the main shaft (1) is driven by a variable speed small motor.
A differential transmission device characterized in that the rotation of the is transmitted to an output shaft (12) in a variable speed.