JPS6038582B2 - Automatic transmission switching speed control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a switching rotation speed control device for an automatic transmission used in a motorcycle or the like.

2. Description of the Related Art Automatic transmissions that use a plurality of centrifugal clutches to automatically change gears by switching the centrifugal clutches according to the engine speed are sometimes used in motorcycles and the like.

However, the centrifugal clutch cuts depending on the rotational speed, so even if you try to suddenly accelerate the engine and take a sudden start, the rotational speed at which the gear changes is constant, so you will only be able to obtain a constant acceleration.

In view of this, this invention is designed so that when a sudden acceleration is required from the engine, the centrifugal clutch on the low speed side is connected to a high rotation speed, and the driving torque is increased by the gear on the low speed side to enable sudden acceleration. Embodiments of the present invention shown in the drawings will be described below.

The figure shows an example of automatic three-speed shifting using three centrifugal clutches from the output shaft of the engine. It is transmitted to the low pinion 5 and low gear 6 via the mari pinion 3 and primary gear 4.
Further, the power is transmitted to the one-way 7, driven pinion 8, driven gear 9, one-way 10, secondary pinion 11, and secondary gear 12, and the power is transmitted from the output rat 13 to the output sprocket 14. When the rotation of the crankshaft increases, the second centrifugal clutch 17 is connected by the second gear 15 and second pinion 16 rotating together with the driven pinion 8, and from the primary gear 4, the second centrifugal clutch 17, second pinion 16, second gear 15, The power transmission path is switched to the driven pinion 8 to increase the speed, and the one-way 7 freely rotates. When the rotation further increases, the centrifugal ball-type third centrifugal clutch 19 is connected by the intermediate shaft 18 that rotates together with the secondary pinion 11, and the third centrifugal clutch 19 is connected from the primary gear 4 to the third centrifugal clutch 19, the intermediate part 18, and the secondary pinion 1.
The power transmission path is switched to 1 and the speed is further increased. In this case, Oneway 7 and Oneway 10 rotate freely. When starting the crankshaft 1, the rotation of the kick shaft 20 rotates the kick pinion 22 and the kick gear 23 via the dog 21, disables the one-way 7 with the pawl lowering piece 24, and starts the low gear 6 and low pinion 5. ,
The crankshaft 1 is rotated via the primary gear 4, primary pinion, and one-way 25. Therefore, the present invention provides a widening shoe 2 of the second centrifugal clutch 17.
A hub 27 having a shaft 6 supported thereon is rotatably supported on a second pinion shaft 28 extending from the second pinion 16.
A slide piece 30 is slidably attached to the hub 27 by a dog 29, and the slide piece 30 is connected to a second pinion 28, which is a rotating shaft to which the rotation of the hub 27 is transmitted, by a runout spline 31. piece 3
A pressing piece 33 is connected via an 0-ra bearing 32, and the tip of the pressing piece 33 is in contact with a pressing plate 34. The pressure receiving plate 36 and the pressing plate 34 of the third far D clutch 19 rest on a sleeve 45 fixed to the intermediate shaft 18, and are in contact with each other by a spring 37. The hub 37 of the third centrifugal clutch 19 is connected to the sleeve 45 and the spline 38 so as to rotate integrally and slide freely. The sleeve 45 is divided into two parts, an inner sleeve 45a and an outer sleeve 45b, and the sleeves 45a and 45b are connected by a friction spline 35, and the pressing plate 34 is integrally connected to the outer sleeve 45b. The third centrifugal clutch 19 pushes the hub 37 as the centrifugal pole 39 rises, and the friction plate 4
0 and 41 are pressed against the pressure receiving plate 36 to transmit rotation from the housing 42 to the hub 37, and the housing 42 serves both as the second centrifugal clutch 17 and the third centrifugal clutch 19. Spring 43 is for pressure adjustment. The effect will be explained.

When running using the second centrifugal clutch 17,
When the accelerator is suddenly opened to request a rapid increase in the rotation of the crankshaft 1, the output of the engine increases, the rotation increases, and the driving torque also increases rapidly.

As a result of this rise, the slide piece 3 is moved to the right in the figure by the swinging spline 31 to which the transmission torque is applied, and presses the press plate 34 via the press piece 33, and then the hap 3
7 to the centrifugal ball 39 side. Therefore, the centrifugal ball 39 is prevented from spreading, and the connection of the third centrifugal clutch 19 is delayed, so that the second centrifugal clutch 17 remains connected and sufficient acceleration can be achieved. When the clutch is sufficiently accelerated, the centrifugal force of the centrifugal ball 39 gradually outweighs the drive torque and the third centrifugal clutch 19 is switched. vice versa,
When the accelerator is released from high speed to move to elliptical driving, the outer sleeve 45b and the pressing plate 34 are moved to the 36 pressure receiving plates by the force of the deflection subline 35 due to the reverse torque, and the centrifugal ball 39 is Third centrifugal clutch 19 until lower
is connected, so it will not switch to the second centrifugal clutch until the vehicle speed drops to mid-range. As explained above, the present invention provides an automatic transmission in which multiple centrifugal clutches are automatically switched and shifted according to the engine speed, in which a slide piece is used to transmit rotation to a rotating shaft to which rotation of a low-speed centrifugal clutch is to be transmitted. The third centrifugal clutch is configured to be connected so as to be slidable in the axial direction, and to change the engagement rotation speed of the high-speed side far D clutch by the axial sliding of the slide piece that occurs in response to the engine drive torque. Since the engagement timing can be varied according to the drive torque, during normal gentle acceleration, each clutch is connected sequentially from 1st, 2nd, and 3rd gear to change gears, but during sudden acceleration, the clutches are engaged from 2nd to 3rd gear. Instead of immediately switching to 3rd gear, it maintains 2nd gear for the time being to improve acceleration performance, and then switches to 3rd gear.

Therefore, excellent acceleration performance can be obtained during sudden acceleration.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention; FIG. 1 is an overall longitudinal sectional view;
FIG. 2 is a longitudinal sectional view of the rhombus. 17...Second centrifugal clutch, 18...
Intermediate shaft, 19...Third centrifugal clutch, 27...Hub,
28...Second pinion shaft, 29...Dog, 30.
... Slide piece, 31 ... Family spline, 33 ... Pressing piece, 34 ... Pressing plate, 3
5...Tearless subrin, 36...Pressure plate,
37...Hub, 38...Spline, 39
・・・・・・Centrifugal ball.・Multiple/Figure 2

Claims (1)

[Claims] 1. In a switching speed control device for an automatic transmission that automatically switches and shifts a plurality of centrifugal clutches according to the engine speed, a high-speed centrifugal clutch and a low-speed centrifugal clutch are arranged adjacently, and the high-speed centrifugal clutch A hub that moves in the axial direction is connected to the rotating shaft by a centrifugal element so that the rotation can be transmitted to the rotating shaft, and the rotation of the low-speed centrifugal clutch is transmitted to the rotating shaft. a slide piece that changes the connecting rotational speed on the high-speed centrifugal clutch side that slides in response to the engine drive torque when switching to the transmission state and moves the hub of the high-speed centrifugal clutch against the centrifugal force of the centrifugal element; A switching rotation speed control device for an automatic transmission, characterized by a torsion spline connection capable of transmitting rotation and slidable in the axial direction.