JPS6035814Y2 - planetary gear transmission - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to a planetary gear type transmission that allows switching between direct drive and speed-up drive in automobiles to be performed smoothly and reliably using an extremely simple mechanism. .

[Conventional technology]

In an era of global energy shortages, overdrive is attracting attention as one of the energy-saving measures for the rapidly increasing number of automobiles.

This overdrive is a special device whose main component is a planetary gear device placed between the transmission and the propulsion shaft, and its purpose is to increase the engine speed without reducing the running speed. By lowering (for example, around 28%),
This results in lower engine noise, lower gasoline costs (eg, 15-20%), and lower engine wear and tear.

[Problem that the invention attempts to solve]

Conventional planetary gear type transmissions used for overdrive are disclosed in, for example, US Pat. No. 3,164,036 and US Pat.
As disclosed in No. 82528 and No. 3230796, the hydraulic system has an extremely complex structure and requires a large operating force to move the friction engagement device (clutch) in the axial direction to achieve direct drive and speed-up drive. It required an actuating device, a poking device to smoothly switch between direct drive and speed-up drive, and a special synchronization mechanism.

In addition, conventional planetary gear type transmissions cause a large shock during switching, making it difficult to perform smooth switching.

[Means and effects for solving the problem 3 This invention is:
In view of the above, in order to eliminate the above-mentioned drawbacks of the conventional planetary gear type transmission, and to enable switching between direct drive and speed increasing drive to be performed smoothly and reliably by an extremely simple mechanism,
Rotational torque is input to the planetary gear carrier of a planetary gear type transmission, and the sun gear and ring gear are directly connected by a cone clutch, thereby outputting the rotational torque directly driven by the ring gear - On the other hand, the sun gear is connected to the cone clutch. The present invention provides a planetary gear type transmission which is fixed by a fixed case via a ring gear and outputs rotational torque driven by an increased speed from a ring gear.

〔Example〕

The planetary gear type transmission according to the present invention will be described in detail below.

FIG. 1A shows an embodiment of the present invention.

This planetary gear type transmission includes a cone clutch 1 having a friction engagement surface (clutch surface) la and a V-shaped cam portion 1b, and a sun gear 3 (cam 3a) disposed inside the cone clutch 1.
and a shoulder 3b), a snap ring 4, an input shaft 5, a cylindrical planetary gear carrier 6 coaxial with the input shaft, and a plurality of planetary gears 8 (
The sun gear 3 and the planetary gears 8 are gear-coupled by a helical gear 3c), and the outer cone (friction surface for direct coupling operation) that is frictionally engaged with the inner cone surface 1a of the cone clutch 1. a ring gear 9 having an inner tooth portion 9b that meshes with a plurality of planetary gears 9a, a plurality of bearings 2 provided between the ring gear 9 and the planetary gear carrier 6, and an output gear integrally constructed with the ring gear 9. 9c, a case 10 having a cone surface (speed-increasing operation friction surface) 10b that is arranged on the outside in the radial direction of the cone clutch 1 and can be arbitrarily frictionally engaged with the cone clutch 1, and a threaded portion 10a, and a case 10 that engages with the threaded portion 10a. a manual operation unit 12 having a mating screw portion and arbitrarily switching between direct drive and speed-up drive, which will be described later;
It has a bearing 11 disposed between the manual operation section 12 and the sun gear 3.

An enlarged exploded view of the V-shaped cam portion 1b of the cone clutch 1 and the cam portion 3a of the sun gear 3 that engages with the V-shaped cam portion 1b is shown in FIG.

From this figure, the relative positional relationship of the cone clutch 1, the sun gear 3, the ring gear 9, the plurality of planetary gears 8 meshing with these gears, and the thrust generating phase ■-shaped cam portions 1b and 3a can be clearly seen.

2A and 2A show another embodiment of the present invention, in which the orientations of the cam portion 1b of the cone clutch 1 and the cam portion 3a of the sun gear shown in FIGS. The case is shown in reverse.

In the above configuration, the planetary gear type transmission according to the present invention rotates the manual operation part 12 clockwise, as shown in FIG. When pushed in this direction, the engaging surface 1a of the cone clutch 1 is pressed against the outer circumferential cone 9a (directly coupled operating friction surface) of the ring gear 9 via the cam portion 3a of the sun gear 3.

When a torque is applied from the sun gear 3 to the cam portion 1b of the cone clutch 1 via the cam portion 3a of the sun gear 3 to cause the cone clutch surface 1a to slide, the cam operates to cause the locking surface 1a of the cone clutch 1 to slip. The cone surfaces 9a of the ring gears are pressed increasingly tightly against each other to prevent slippage.

Therefore, the sun gear 3, the planetary gear carrier 6, and the ring gear 9 rotate at the same angular velocity, that is, a direct drive is obtained in which the rotation input from the input shaft 5 is outputted at the same rotation speed via the output gear 9c. .

Next, when the manual operation unit 12 is rotated to pull the sun gear 3 to the right in the drawing, the cone clutch 1 is pushed by the shoulder 3b of the sun gear 3 and the cone surface of the case 10 (friction surface for speed-up operation) ) 10b.

When the input torque from the input shaft 5 increases, the torque transmitted from the planetary gear 8 to the sun gear increases and the cams 3a and 1b
An attempt is made to rotate the cone clutch 1 via the

This torque is applied to the planetary gear 8, the sun gear 3, and the helical gear 3.
Since c is attached, a rightward thrust is generated in the sun gear 3.

If the helix angle of the helical gear 3C is determined so that the frictional force generated between the cone clutch 1 and the case 10 is larger than the torque transmitted from the planetary gear 8 to the sun gear 3, the sun gear 3 is transmitted through the cone clutch 1. and is fixed to the case 10.

Therefore, the rotation of the ring gear 9 is driven at an increased speed with respect to the planetary gear carrier 6.

In the above embodiments, the switching is performed using the manual operation unit, but the switching is not limited to manual operation.

[Effect of idea]

As explained above, according to the planetary gear type transmission of the present invention, rotational torque is input to the planetary gear carrier of the planetary gear mechanism, and the rotational torque of the direct drive is transmitted by directly connecting the sun gear and ring gear with the cone clutch. On the other hand, by fixing the sun gear to the stationary case with a cone clutch, the increased rotational torque is output from each ring gear, making it possible to easily and reliably switch between direct drive and accelerated drive. .

[Brief explanation of the drawing]

Figure 1A is a schematic cross-sectional view of an embodiment of the planetary gear type transmission of this invention; Figure 1A is a partially enlarged exploded view of Figure 1A; Figure 2A is a cross-section showing another embodiment of this invention. Schematic diagram: Figure 2A is a partially enlarged exploded view of the opening in Figure 2. Explanation of symbols, 1... Cone clutch, 1b...
...Cone clutch cam, 3...Sun gear, 3a...Sun gear cam, 4...
Snap ring, 5... Input shaft, 6...
・Planetary gear carrier, 8...Planetary gear, 9...
...Internal gear, 9a...Cone surface of internal gear,
9b... Output gear, 10... Case,
10a... Screw, 10b... Cone surface of case, 11... Bearing, 12...
Manual operation section.

Claims (1)

[Scope of Claim for Utility Model Registration] A planetary gear mechanism that inputs rotational torque to a planetary gear carrier and outputs the rotational torque that is directly connected or accelerated from a ring gear, and a planetary gear mechanism that surrounds the planetary gear and acts as a speed increaser on its inner peripheral surface. In a planetary gear type transmission equipped with a fixed case having a friction surface for friction, the planetary gear is rotationally supported by the planetary gear carrier via a helical gear mechanism that generates a thrust force in a predetermined first direction. a sun gear which has a first ■-shaped cam formed on the outer periphery of the shaft and is gear-coupled with the sun gear and which moves in the first direction and a second direction opposite thereto; and a friction for speed-increasing operation of the fixed case. a clutch surface located between the surface and a friction surface for direct coupling operation formed on the outer peripheral surface of the ring gear, and engages with the first ■-shaped cam to generate a thrust force in the second direction. a cone clutch having a second ■-shaped cam forming a cam portion and sliding in the first and second directions on the shaft of the sun gear; and a cone clutch that slides the sun gear in the first and second directions. an operating section for moving the sun gear; when the operating section moves the sun gear in the first direction, the movement brings the sun gear into contact with the cone clutch, and this contact brings the cone clutch together with the sun gear; The clutch surface is brought into contact with the speed increasing operation friction surface of the fixed case by moving in the first direction, and in this contact state, the clutch surface is brought into contact by a thrust force in the first direction generated by the helical gear mechanism. The cone clutch is braked by increasing pressure to stop the sun gear via the cam part, thereby outputting increased rotational torque from the ring gear, when the cone clutch is moved in the second direction via the cam portion to bring the clutch surface into contact with the direct-coupling friction surface formed on the outer periphery of the ring gear;
Directly connecting the sun gear and the ring gear via the cone clutch by the thrust force of the cam portion in the second direction that increases under this contact state, and outputting a rotational torque of a direct drive from the ring gear. A planetary gear type transmission featuring: