JPH0626764Y2 - Operating device for automatic transmission of vehicle - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is intended for light vehicles such as a yard truck, an agricultural work vehicle, and a golf cart that are driven at a relatively low speed without fear of collision. The present invention relates to an operation device for an automatic transmission of a vehicle that is provided as a suitable device.

2. Description of the Related Art Japanese Patent Publication No. Sho 57-13221 discloses a plurality of conical rotors provided on a transmission system extending from an input shaft to an output shaft, and a speed change ring commonly frictionally engaged with the conical rotors. Equipped with a small diameter transmission wheel and a large diameter transmission wheel, the conical rotor has a conical surface that frictionally engages the inner peripheral surface of the transmission ring, and a transmission with a concave cross-section that frictionally engages the small diameter transmission wheel on the input shaft. Surface and a flat transmission surface that frictionally engages with a large diameter transmission wheel having a center axis that matches the center axis of the input shaft.The rotation of the transmission wheel is output because the rotation of the transmission ring is restricted. The rotational speed of the output shaft is changed by transmitting the transmission ring to the shaft and moving the transmission ring along the conical surface of the conical rotor in the direction of the central axis of the input shaft and the output shaft to change the effective radius of the conical surface. A friction continuously variable transmission is shown. This friction continuously variable transmission has a characteristic that the point where the rotational speed of the output shaft is set to 0 is included in the gear shift range and the magnitude of the torque that can be generated as the rotational speed of the output shaft decreases. Further, JP-A-59-151656 and JP-A-61-144461 disclose automatic transmissions for vehicles utilizing the friction continuously variable transmission. In each of the above-mentioned publications, an automatic speed change action portion is configured by a cam that generates thrust of a magnitude corresponding to the magnitude of torque applied to the speed change ring and a spring that receives the thrust generated by this cam. However, the state of the drive source of the friction continuously variable transmission is different between the one shown in JP-A-59-151656 and the one shown in JP-A-61-144461, and in the former case, In the latter, the rotational speed of the drive source is kept constant, whereas the rotational speed of the drive source is changed. The former is suitable for general traveling vehicles because the vehicle speed can be made sufficiently high, but the control system becomes somewhat complicated. On the other hand, the latter is difficult to give a high vehicle speed required for a general traveling vehicle because the rotation speed of the drive source is kept constant (for example, 3600 RPM), but the configuration of the control system is simple. do it,
It can be said that it is suitable for applications that do not require high speed running.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention Japanese Patent Laid-Open No. 61-144
In Japanese Patent No. 461, an automatic gear shift acting portion configured as a cam that generates a thrust having a magnitude corresponding to the magnitude of torque applied to a shift ring and a spring that receives the thrust generated by the cam. However, there is a problem in the operation of moving the transmission ring toward the direction in which the rotational speed of the output shaft becomes 0 when an operating condition requiring sudden braking appears. That is, JP-A-61-14446
Since the above-mentioned spring in this one shown in Japanese Patent Publication No. 1 is balanced with the thrust having a magnitude corresponding to the magnitude of the torque applied to the transmission ring, the braking operation for moving the transmission ring in the direction of reducing the rotational speed of the output shaft to 0 This must be done with the compression of the spring, which delays the braking applied to the vehicle and gives one cause for the lack of smooth running of the vehicle.

Means for Solving the Problems The present invention is intended to solve the above problems, and a plurality of conical rotors provided on the transmission system from the input shaft to the output shaft, and friction that is common to the conical rotors. The conical trochanter has a conical surface that frictionally engages with the inner peripheral surface of the transmission ring, and a friction engagement member on the small diameter transmission wheel on the input shaft. A mating concave transmission surface and a flat transmission surface that frictionally engages a large-diameter transmission wheel having a central axis that coincides with the central axis of the input shaft are provided, and the rotation of the transmission ring is restricted and large. The rotation of the radial transmission wheel is transmitted to the output shaft, and the transmission ring is moved along the conical surface of the conical rotor in the direction of the central axis of the input shaft and the output shaft to change the effective radius of the conical surface. Internal combustion engine in which the continuously variable friction continuously variable speed is rotated at a constant speed An automatic transmission apparatus for a vehicle, in which automatic shifting is performed by a cam driven by an engine and generating a thrust of a magnitude corresponding to the magnitude of torque applied to the shift ring, and a spring receiving a thrust generated by the cam. A transmission ring holding member for holding the transmission ring, a support shaft for supporting the transmission ring moving member so as to move in the axial direction, and a manual or penetrating through a through hole provided at the upper end of the transmission ring moving member. A rod body that is moved forward and backward by a foot movement operating device, an engaging portion on the rod body, and a spring seat at an end portion, and a member for moving a speed change ring between the engaging portion and the spring seat. And a rod into which the other end of the spring, one end of which is maintained by the spring seat, is inserted, and the forward movement of the rod causes the spring to shift to a compressed state in which automatic shifting is performed, and the rod retracts. It The engaging portion on the rod is provided so as to move the member for moving the shift ring toward a position where the force applied by the spring is reduced and the rotational speed is set to 0 when the lever is moved. .

Operation The manual or foot operation device provided in the above-mentioned embodiment performs the following first and second operations.

First action: This action is a action for applying a normal force to the spring so that the automatic gear shift is performed as expected.

Second action: This action is performed when the operation of suddenly moving the transmission ring toward the position where the rotational speed of the output shaft is set to 0 when sudden braking is required (operation of rapidly increasing the gear ratio). This is an action so as not to be obstructed by the spring. (Here, the sudden braking is an action of "reduction ratio = rotational speed N _{1 of} input shaft / rotational speed N _{2 of} output shaft" sharply increases, and thereby strong braking is applied to the vehicle). Specifically, when the vehicle is at a standstill, the spring is in an expanded state, and the spring in the expanded state shifts to a normal state in which the desired automatic shift occurs by the first action. . To apply sudden braking during traveling, set the output shaft rotation speed to 0.
It suffices to move the speed change ring toward the larger diameter side of the conical trochanter toward the position where the second action is performed.

Embodiment In FIG. 1, 1 is an internal combustion engine rotated at a constant speed, 2 is a friction continuously variable transmission driven by the internal combustion engine, 3, 4
Is an input shaft and an output shaft of the friction continuously variable transmission 2, and 5 are a plurality of conical rotors provided on a transmission system from the input shaft 3 to the output shaft 4.

The conical rotor 5 has a conical surface that frictionally engages with the inner peripheral surface of the transmission ring 8, a transmission surface with a concave cross-section that frictionally engages with the small diameter transmission wheel 6 on the input shaft 3, and the input shaft 3 There is provided a flat transmission surface that frictionally engages a large diameter transmission wheel 7 having a central axis that coincides with the central axis. 9 is a member for moving the speed change ring, 10
Is the supporting axis. The speed change ring moving member 9 has a through hole at its upper end, and the speed change ring 8 is held in a non-rotating state by a rod 16 passing through the through hole.

Reference numeral 11 denotes a roller attached to the stationary portion, which is the speed change ring 8
A cam 12 having a working surface that engages with the roller 11 is attached to the. The cam 12 is an element that generates a thrust force having a magnitude corresponding to the torque applied to the speed change ring 8. When the load torque increases, the thrust force generated by the cam 12 is applied to the spring 13. 4 and 5 are views showing the positional relationship between the cam 12 and the roller 11 provided in the automatic transmission according to the present invention. Of these drawings, FIG. 4 shows the large diameter end of the conical surface of the conical rotor 5 such that the frictional engagement point between the transmission ring 8 and the conical rotor 5 reduces the rotational speed of the output shaft to zero. FIG. 5 shows the positional relationship between the cam 12 and the roller 11 in the state of reaching the vicinity. FIG. 5 shows that the frictional engagement point between the transmission ring 8 and the conical rotor 5 maximizes the rotational speed of the output shaft. 3 shows the positional relationship between the cam 12 and the roller 11 in a state in which the cone 12 has reached the vicinity of the apex of the conical surface. The positional relationship between the cam 12 and the roller 11 shown in FIG. 4 is the same as that of the cam 12 and the roller 1 shown in FIG.
It is the same as the positional relationship with 1.

Automatic gear shifting by the cooperation of the cam 12 and the roller 11 occurs according to the process described in the following a and b.

a. When the load torque increases, the compression amount of the spring 13 increases by an amount corresponding to the increase amount of the load torque, and the transmission ring 8 is moved toward the large diameter side of the conical surface of the conical rotor 5. The rotational speed of the output shaft 4 is reduced as the possible torque is increased, and b, conversely, when the load torque is reduced, the spring 13
The amount of compression of the output shaft 4 decreases as the load torque decreases and the transmission ring 8 moves toward the apex side of the conical surface of the conical rotor 5 to reduce the torque that can be generated.
Increase the rotation speed of.

14 is a spring seat for receiving the spring 13, and a manual lever 15
It is provided on the rod 16 that can be moved forward and backward by. In addition to the spring seat 14 described above, the rod 16 is provided with an engaging portion 17 that engages with the speed change ring moving member 9 when the spring seat 14 is retracted. Further, a speed change ring moving member 9 is inserted between the spring seat 14 and the engaging portion 17 on the rod 16, and a spring 13 is inserted between the speed change ring moving member 9 and the spring seat 14. .

The rod 16 releases the normal compression state of the spring 13 (a compression state selected so that automatic gear shifting is performed as scheduled) by installing the engaging portion 17 while releasing the output shaft 4
It is used to apply braking to the vehicle by moving the speed change ring 8 in the direction in which the rotational speed of 0 is reduced to zero. The engaging portion 17 is a braking element and also an element that restricts rotation toward the high speed side. 2 shows a state in which the spring seat 14 is moved forward (moved leftward) by rotating the lever 15 in the state shown in FIG. The compressed state for automatic shifting is shown. The automatic gear shift is performed based on this state. The lever 15
Keeps the rotational orientation imparted to it by a freewheel device or a latch or the like.

FIG. 3 shows a state in the automatic speed change process that occurs after the state shown in FIG. The amount of the clockwise rotation given to the lever 15 can be appropriately selected, whereby the base point at which the automatic shift is performed is changed.
An operating device including the lever 15, the rod 16 and the like is designated by reference numeral 18 in the drawing.

In order to apply the sudden braking during the automatic shift traveling, the action of the free wheel device or the latch or the like for keeping the state in which the amount of compression that allows the automatic shift traveling is applied to the spring 13 is first released to move the rod 16 axially. The first operation that allows the movable body to move freely and the second operation that rotates the lever 15 counterclockwise to retract the rod 16 may then be sequentially and rapidly performed. When the rod 16 is retracted, the engaging portion 17 on the rod 16 retracts the speed change ring moving member 9 to move the speed change ring 8 toward a position where the rotational speed of the output shaft 4 is zero. That is, the frictional engagement point between the conical rotor 5 and the speed change ring 8 is moved toward the large diameter side of the conical surface of the conical rotor 5 by the above operation, and a large load resistance is generated, which causes a sudden increase. Braking is applied.

Effects of the Invention The present invention is intended to facilitate automatic shifting with a relatively simple structure for small vehicles that do not require high speed traveling, such as yard trucks, agricultural work vehicles, and golf carts. To do. This is designed to keep the spring, which cooperates with the cam on the speed change ring and which constitutes the automatic speed change action section, in the normal compression state only when the automatic speed change is required, while the braking is not required for the automatic speed change. In the above, the normal compression state of the spring is released, thereby providing an effect that braking is applied easily and quickly.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an example of an automatic transmission according to the present invention, FIGS. 2 and 3 are partial views for explaining the operation of the one shown in FIG. 1, and FIGS. 4 and 5 are automatic transmissions according to the present invention. It is explanatory drawing which shows the positional relationship of the cam 12 and the roller 11 which are provided in the apparatus in two states. Explanation of symbols 1 …… Internal combustion engine 2 …… Friction continuously variable transmission 3 …… Input shaft 4 …… Output shaft 5 …… Conical rotor 6 …… Small diameter transmission wheel 7 …… Large diameter transmission wheel 8 …… Shifting Ring 9 ... Gear shift ring moving member 10 ... Support shaft 11 ... Roller 12 ... Cam 13 ... Spring 14 ... Spring seat 15 ... Lever 16 ... Rod 17 ... Engagement portion 18 ... Operation apparatus

Claims (1)

[Scope of utility model registration request] 1. A plurality of conical rotors provided on a transmission system extending from an input shaft to an output shaft, a speed change ring commonly frictionally engaged with the conical rotors, a small diameter transmission wheel and a large diameter transmission wheel. The conical rotor has a conical surface that frictionally engages the inner peripheral surface of the transmission ring, a transmission surface having a concave cross-section that frictionally engages a small diameter transmission wheel on the input shaft, and the central axis of the input shaft. Is provided with a flat transmission surface that frictionally engages a large-diameter transmission wheel having a center axis line that matches the rotation axis of the large-diameter transmission vehicle, and the rotation of the large-diameter transmission vehicle is transmitted to the output shaft. The rotation speed of the output shaft is changed by moving the input shaft and the output shaft along the conical surface of the conical rotor in the direction of the central axis of the conical surface to change the rotational speed of the output shaft. Driven by an internal combustion engine that rotates below the In a vehicle automatic transmission in which automatic shifting is performed by a cam that generates a thrust of a twisting force and a spring that receives the thrust generated by the cam, a shift ring moving member that holds a shift ring, and the shift ring. A support shaft that supports the moving member so as to move in the axial direction, a rod that penetrates through a through hole provided in the upper end portion of the speed change ring moving member, and is moved forward and backward by a manual or foot operation device. The spring having an engaging portion on the rod and a spring seat at the end, one end of which is supported by the speed change ring moving member and the spring seat between the engaging portion and the spring seat. The other end of the rod is inserted, the spring is moved to a compressed state in which automatic shifting is performed by advancing the rod, and when the rod is retracted, the engaging portion on the rod applies a force applied by the spring. Decrease Operation in the automatic transmission of a vehicle, characterized in that the rotational speed toward a position to 0 is provided to move the control ring moving member device.