JPS61103054A - Speed change for vehicle - Google Patents

Abstract

PURPOSE:To improve the operationability and fuel consumption by transferring to direct-coupled drive condition upon increase of rotary speed of the output shaft in speed change drive system. CONSTITUTION:A conical rotary chip 8 is provided with a transmission face 8b having recessed cross-section engagable frictionally with a transmission wheel 10 on the input shaft 1 and a flat transmission face 8c engagable frictionally with a raceway ring 12 as well as a conical face 8a. While speed change mechanism section 3 has a conical rotary chip 8, a speed change ring 9, a transmission wheel 10 and a raceway ring 12 and two transmission faces 8b, 8c are provided to the conical rotary chip 8 as well as the conical chip 8a. The speed change ratio of regulation gear system 4 is selected such that V-drive and C-drive transmission systems will be synchronous upon collision of speed change ring 9 against the stopper, and upon collision of speed change ring 9 against the stopper to bring the rotary speed of said ring 9 to the maximum, it is switched to C-drive transmission system through a switching unit 5.

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial field of application: Used in the field of vehicle transmissions, especially automobile transmissions.

Conventional technology: Transmissions currently in use for automobiles include manually operated multi-speed transmissions, automatic multi-speed transmissions that use a torque converter, and multi-speed transmissions that do not use a torque converter but use automatic clutches. etc. On the other hand, automobile transmissions using continuously variable mechanical transmissions are currently in the process of development and research.

Automatic multi-speed transmissions that use a torque converter have become widely used because they are easy to operate, but manual multi-speed transmissions are also quite widely used due to their low efficiency and low fuel consumption. ing. Multi-speed transmissions that use an automatic clutch without a torque converter are increasingly being used because they are easy to drive, highly efficient, and have good fuel economy, but they have drawbacks in terms of price and low exhaust emissions. It is only used in large-scale luxury cars.

All of the above transmissions have a reverse gear, and all of the transmissions other than automatic multi-speed transmissions that use a torque converter have a clutch.

Problems to be solved by the invention: The multi-speed transmission pointed out in the above-mentioned conventional technology is not considered to be satisfactory in all aspects of operability, fuel efficiency, and price, and has some drawbacks, and furthermore, They are equipped with a reverse gear as an essential element.

An object of the present invention is to provide a transmission for a vehicle, particularly a transmission for an automobile, which is not only superior in terms of operability, fuel efficiency, and cost, but also does not have a reverse gear.

Means for Solving the Problems' According to the present invention, the speed change range includes a point where the rotational speed of the output shaft is zero, and the maximum value of the torque that can be generated is such that the rotational speed of the output shaft is zero. A variable speed transmission system near the point and a fixed speed ratio transmission system with a constant speed ratio are provided with the input shaft and output shaft in common, and the rotational speed of the output shaft gradually increases to the rotational speed of the input shaft. When the synchronized state is reached, the drive of the output shaft via the variable speed drive system is transferred to the drive via the fixed speed ratio 5 coupling system, that is, the state of direct drive, and when the set conditions are met, the drive of the output shaft is transferred to the drive via the fixed speed ratio 5 coupling system, and when the set conditions are met, the drive of the output shaft is A drive system switching device that cancels the drive state and shifts to a drive state via the variable speed drive system is provided, and the characteristic that gives the output shaft forward rotation for forward movement of the vehicle and reverse rotation for reverse movement is changed in the speed change transmission system. It is characterized by the fact that it has been given to the mechanical part.

The above-mentioned speed change transmission system has the maximum value of the torque that can be generated near the point where the rotational speed of the output shaft is zero, so it is possible to start the vehicle (hereinafter simply referred to as the car) without using a clutch. In addition, since the output shaft has a characteristic that provides reverse rotation for reversing the vehicle, this, together with the above torque characteristics, eliminates the need for a reverse gear.

On the other hand, the above-mentioned fixed speed transmission system is intended to avoid disadvantages caused by constant use of the variable speed transmission system (extend the life of the variable speed transmission system and improve fuel efficiency).

The drive system switching device is used when the drive of the output shaft via the fixed speed ratio transmission system becomes inappropriate (when there is a risk of engine overload, when it is necessary to apply engine braking, (e.g., when it is necessary to give sudden acceleration to a motor), the drive of the output shaft via the fixed speed ratio transmission system is returned to the drive of the output shaft via the variable speed drive system.

The drive of the output shaft via the variable speed transmission system is called "■Drive".
If we call the drive of the output shaft via a fixed speed ratio transmission system "C drive", then the distance traveled by a car with drive is much smaller than the distance traveled by a car with C drive, and in many cases the former The distance traveled by the car is approximately 30 inches of the total distance traveled.

Example: FIG. 1 shows an example of a transmission according to the present invention.

In this figure, (II tri input axis, (2) is the output axis.

The v! I pointed out earlier! Using the terms 1A drive and C drive, the drive system consists of the input shaft il+ and the transmission mechanism (
31 and a synchronizing adjustment gear device (41), and a switching device (5) shown in FIG. 3 is interposed between the drive system (1) and the C drive system. (Only the two working ends 1611?+ of the device 51 are shown.) Fig. 2 is an explanatory diagram of the transmission mechanism section (3), and in this figure, (8) is a conical trochanter provided with a plurality of conical trochanters. One of them (9) is a transmission ring that frictionally engages with the conical surface (8a) of the conical trochanter (8). , a transmission surface (8b) with a concave cross-section that frictionally engages with the transmission wheel flG on the input shaft (1), and a flat transmission surface (8c) that frictionally engages with the raceway ring (12).Transmission mechanism section. (3) is the conical trochanter (8), speed change ring (9), and transmission head.

The point of having the raceway ring O2 and the conical trochanter (81 having two transmission surfaces (8b) and (8c) on the conical surface (8a) are shown in Japanese Patent Publication No. 57-13221). However, in this one,
A speed change range in which the speed change ring (9) is reversed by shifting the frictional engagement point P between the transmission surface (8c) and the raceway ring +15 by a slight amount toward the center line XX of the conical trochanter +81. W′ is the speed change range W in which the speed change ring (9) rotates in the normal direction.
By using the transmission range W', the vehicle can be moved backwards without requiring a reverse gear.

As shown in the figure, if the effective radius a - f is shown, the relationship between the rotational speed NF of the speed change ring (91) and the rotational speed N of the input shaft fil is expressed by the following equation.

K in the formula is a constant, and a is a variable. Movement of the speed change ring 191 toward the high speed side is restricted by a stopper (not shown). The rotational speed NR of the speed change ring (9) is bc −a
d = 0, that is, it becomes 0 when the condition of a:b=c:d is satisfied, and when be-ad>O, N11>0
．． 1) NR<0 when C-ad<0.

The gear ratio of the adjusting gear device (4) in Figure 1 is the gear ratio (shift ring) (
9) is brought into contact with the stopper, (NR=NR
When +nax is reached) ■ The drive transmission system and the C drive transmission system are selected to be synchronized, and in this case, the sun gear a3 is the output member, the ring gear (+4+ is the fixed member, and the planetary gear ( This is a planetary gear device in which a carrier 1161 of 151 is a member fixed to a speed change ring (9).

The switching device (5) shown in Fig. 3, which was pointed out earlier, switches the V-drive transmission system by a signal from the transmitter an when the speed change ring (9) collides with the stopper and becomes NRrny. The drive of the output shaft (2) via the C drive transmission system is shifted to the drive of the output shaft (2) via the C drive transmission system.
One of the actuators 11 of 0g is attached to the working end (
6), and the other actuator is V
Place the track ring (13 anti-rotation material C) to cut off the drive.
This is done by retracting the active end (7) for Il+.

The C drive state created in this way is C! The signals from the transmitting section that receive various signals indicating that the E-movement state is unfavorable are canceled by entering the AC and CHETA (11), and the V-drive state occurs again.

Examples of the above-mentioned signals are those exemplified earlier in the "effect" column. The V-drive state reproduced in this way is NR: N if speed change ring (9) is allowed to increase speed.
This continues until Rrnax is reached, and when NR = NRwax is reached, the V drive state shifts to the C drive state 0. Effects of the Invention: As clarified by the above explanation, the present invention achieves the above points. The object of the present invention is to solve the problem and provide a practical transmission for a vehicle that is not only superior in terms of operability, fuel efficiency, and price, but also does not have a reverse gear.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view showing an example of a vehicle transmission according to the present invention, FIG. 2 is a drawing for explaining the operation of the transmission mechanism section in the transmission shown in FIG. 1, and FIG. FIG. 2 is a system diagram for explaining the operation of a drive system switching device. (1)...Input shaft (21...Output shaft (31...)
・Transmission mechanism part (4)...Adjustment gear device (5)...
・Switching device (6)... Working end of the switching device (8)・
... Conical trochanter (8a) ... Conical surface (8b) ...
・Concave cross-section transmission surface (8C)...Flat transmission surface (
9)...Speed ring 02...Orbit ring 0t.
・Sun gear I...Ring gear U...Planetary gear
(l[9...Carrier (+71...Transmitter 08
1 ilt...actuator ■...gear integrated into the sun gear 1211...rotation prevention material ■...signal ■...transmission section Fig. 1 1-----"h cam 2- --- 4; f7 axis 3 --- t41 muse 4-4 g1 fraud] +゛ book l 0 ~ f ---- first hat -! 几 8 ---- one yen girl car 9 --- −t, d phosphor 10 −−−−−− Pin ζ Force On axis: Im'
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Claims (1)

[Claims] A variable transmission system that includes the point where the rotation speed of the output shaft becomes 0 in the speed change range, and in which the maximum value of the torque that can be generated is near the point where the rotation speed of the output shaft becomes 0, and has a constant speed change ratio. A fixed speed ratio transmission system is provided with the input shaft and output shaft in common, and when the rotational speed of the output shaft gradually increases and reaches a state in which it is synchronized with the rotational speed of the input shaft, the output shaft is The drive is transferred to the drive of the output shaft via the constant speed ratio transmission system, that is, the state of direct drive, and when the set conditions are met, the direct drive state is canceled and the drive is started via the variable speed drive system. A vehicle transmission characterized in that a transmission mechanism in a transmission transmission system is provided with a drive system switching device for shifting the drive system to a state in which the output shaft rotates forwardly for forward movement of the vehicle and reversely rotates for reverse movement of the vehicle. .