JPS644953B2 - - Google Patents

Description

[Detailed Description of the Invention] A conventional traveling device equipped with a super turning device is configured to always operate regardless of whether the traveling speed is slow. It was dangerous.

In the present invention, when the aircraft is traveling at a low speed, it is possible to make a sharp turn, but as the traveling speed increases, the turning radius gradually increases, thereby ensuring the safety of the operator and preventing damage to equipment. A variable torque clutch is installed in a reverse rotation transmission system leading to a side clutch of a transmission, and a variable throttle valve of a hydraulic cylinder that operates the variable torque clutch is interlocked and connected to the side clutch, and the variable throttle valve is connected to the side clutch. The throttle restricting member attached to the valve and the speed change lever of the continuously variable transmission device for the traveling device are interlocked and linked so that the throttle of the variable throttle valve is restricted to a greater extent as the traveling speed increases. It is something.

The embodiment shown in the drawings will be explained below. In FIG. 1, 1 is a driven pulley of a continuously variable transmission, which is attached to an input shaft 3 of a transmission 2.
Gear 4 of input shaft 3 drives gear 8 of transmission shaft 7 via intermediate gears 5 and 6, and movable gear 9 of transmission shaft 7 drives back gear 11 of shaft 10, gear 13 of clutch shaft 12, and gear 14. Select and engage the sides of the
The gear 14 meshes with a gear 15 of the clutch shaft 12, and a variable torque clutch 18 that is operated by hydraulic oil press-fitted from an oil port 17 is attached to a clutch gear 16 provided at one end of the clutch shaft 12. It has been done.

Reference numeral 19 rotatably supports a center gear 20 that meshes with the gear 15a of the clutch shaft 12, and side clutch gears 21, 21 that engage and disengage on both sides thereof, and has a reverse clutch gear 22a at one end and a reverse clutch gear 22b at the other end. A steering axis with a fixed
The reverse clutch gear 22b meshes with one gear 24 of the intermediate shaft 23, and the other gear 25 meshes with the clutch gear 16, and the side clutch gear 21
It constitutes a reverse transmission system.

Further, the side clutch gears 21, 21 mesh with axle gears 27, 27 of a pair of left and right axles 26, 26. Note that 63 is a brake.

In FIGS. 2 and 3, 28 and 28 are a pair of left and right shafts that operate the shifters of the side clutch gears 21 and 21, and shift arms 29 and 29 that protrude from the bosses of these shafts 28 and 28 are operated. Swing arms 32, 32 are connected to side clutch levers (or petals) 30, 30 provided on the panel with operating wires 31, 31, and protrude from the bosses.
faces a receiving plate 35 at the upper end of an operating shaft 34 attached by a pin to a vertically swingable holding arm 33.

36 is a variable throttle valve in which the tip of a spool 37 is connected to the operating shaft 34 via a flexible pipe 38 and an adjustment nut 39; the lower end of a rod 40 whose upper end is fixed to the spool 37 is attached to the variable throttle valve 36; It is slidably supported by a support 41 and is biased upward by a spring 42.

Further, the throttle restricting member pivotally supported by a pin 43 at the lower part of the variable throttle valve 36 is composed of a fan-shaped cam 44 having a circumferential surface whose distance from the pivot point gradually increases from one end to the other end. The arm 45 provided on the boss section is the gear lever 5 of the continuously variable transmission.
5 through a rod 46 or the like.

49 is a driving pulley of a continuously variable transmission device that drives the driven pulley 1 via a V-belt 48, and its shaft 50 is connected to a working machine pulley 54 by a shaft 51 driven by an engine as shown in FIG.
The V-groove of the drive pulley 49 is expanded and contracted by a hydraulic cylinder 52, and two switches S1 and S2 inserted into the control circuit of a solenoid valve 53 that operates the hydraulic cylinder 52 are shown in FIGS. 6 and 7. As shown, it is attached to the continuously variable speed lever 55.

The control cam plate 57, which is rotatably supported on the shaft 56 of the continuously variable speed lever 55, has a notch 5 at one end where the switch S1 is turned OFF, as shown in FIG.
An arm 58 having a diameter 7a and integrally protruding from the boss portion of the control cam plate 57 has one end connected to the boss portion of the movable pulley 49a of the drive pulley 49;
The other end of a swinging arm 59 whose intermediate portion is pivotally supported on the circumferential surface of the hydraulic cylinder 52 is connected to a rod 60, and when the continuously variable transmission is set to a predetermined speed and is in neutral, the ninth Switch S as shown in figure a
1 enters the notch 57a of the control cam 57 with the OFF state, and S2 rides on the circumferential surface of the control cam 57.
It is set to OFF.

To increase the traveling speed in this state, move the gear shift lever 55 forward (left side) as shown by the chain line in Fig. 7.
When the switch S1 is tilted to the left side, the switch S1 rides on the control cam 57 and turns ON as shown in FIG. speed up.

At this time, as the movable pulley 49a moves, the swing arm 59 pulls down the arm 58 and rotates the control cam 57 counterclockwise in FIG.
7a, it is turned off and the solenoid valve 53 becomes neutral.

Further, when the gear shift lever 55 is rotated backward to decelerate, both switches S1 and S2 are disengaged from the control cam 57 as shown in FIG. 9c, and the switch S1 is
OFF, S2 is turned ON and the solenoid b is energized, the movable pulley 49a and the control cam 57 move in the opposite direction to the speed increase, and become neutral at the switch setting position.

During such a speed change operation, the speed change lever 55 tilts the fan-shaped cam 44 laterally through the rod 46 at a low speed position as shown in FIG. 2, and stands up as shown by the chain line at a high speed position.

When one side clutch lever 30 is pulled to turn the aircraft, the operating wire 3 on that side
1 pulls the shift arm 29 to disengage one side clutch gear 21 from the center gear 20 and engage it with the reversing clutch 22a on that side.

At this time, the swing arm 32 protruding from the boss of the shift arm 29 also rotates together with the shaft 28, but its tip is set so as to come into contact with the receiving plate 35 when the side clutch gear 21 enters the reverse clutch 22a. Since there is a side clutch lever 3
0 is further pulled, the receiving plate 35 pushes the spool 37 of the variable throttle valve 36 through the operating shaft 34, and the variable torque clutch 1 is activated by the pressure of the hydraulic cylinder 61.
As shown in Fig. 11, the transmitted torque of 8 gradually increases from point A, and when the transmitted torque reaches point B, the reverse clutch 2, which was rotating in the normal direction while being braked,
At point 2a, the vehicle stops and makes a pivot turn, after which it slowly rotates in the opposite direction, and at point C, it rotates in the opposite direction at a predetermined speed and makes a super pivot turn.

However, since the fan-shaped cam 44 rotates in conjunction with the continuously variable speed lever 55, when the continuously variable speed lever 55 is at the highest speed position D, the fan-shaped cam 44 rotates in conjunction with the continuously variable speed lever 55.
is in the most upright position, so spool 3
7 is allowed to move only slightly, the torque transmitted by the variable torque clutch 18 becomes small, the aircraft turns with a large turning radius, and at the lowest speed position E of the continuously variable transmission lever 55, the fan-shaped cam 44 falls sideways. Since the operation of the spool 37 is not restricted in this way, it is possible to perform a super pivot turn.

The amount of tilting of the side clutch lever 30 is determined by the tilting angle of the fan-shaped cam 44, that is, the tilting angle of the speed change lever 55.
Although it is limited by the position of the flexible pipe 38, it is buffered to some extent by the bending of the flexible pipe 38.

As described above, the present invention equips a reverse rotation transmission system leading to a side clutch of a transmission with a variable torque clutch, and operatively connects a variable throttle valve of a hydraulic cylinder that operates the variable torque clutch to the side clutch, and also connects the variable throttle valve to the side clutch. The throttle restricting member attached to the vehicle is interlocked with the speed change lever of the continuously variable transmission for the traveling device, and the throttle of the variable throttle valve is configured to be more restricted as the traveling speed increases.
At low speeds, it is possible to perform super-turning turns, but as the traveling speed changed by the continuously variable transmission increases, the throttle of the variable throttle valve is sequentially limited by the throttle limiting member, and the transmission torque of the variable torque clutch is reduced. As the speed increases, the turning radius of the aircraft becomes larger, allowing safe operation and preventing damage to the transmission device due to sudden large loads.

[Brief explanation of the drawing]

The drawings show one embodiment of the invention,
Figure 1 is a developed sectional view of the transmission, Figure 2 is a front view of the same as above, Figure 3 is a partially cutaway side view of the same as above, Figure 4 is a sectional view of the continuously variable transmission, and Figure 5 is the continuously variable transmission. A circuit diagram of the switching valve of the hydraulic cylinder that operates the device, Figure 6 is a front view of the operating device of the continuously variable transmission,
Fig. 7 is a side view of the same as above, Fig. 8 is a control circuit diagram of the switching valve, Fig. 9 a, b, c is a perspective view of the switch section of the switching valve, Fig. 10 is a hydraulic circuit diagram of the variable throttle valve, 11
The figure is a torque diagram. 18...Variable throttle valve, 21...Side clutch gear,
29...shift arm, 30...side clutch lever, 34...operating shaft, 36...variable throttle valve, 44...fan-shaped cam, 52, 61...hydraulic cylinder, 55...shift lever.

Claims (1)

[Claims] 1. A reverse rotation transmission system connected to a side clutch of the transmission is equipped with a variable torque clutch, a variable throttle valve of a hydraulic cylinder that operates the variable torque clutch is interlocked and connected to the side clutch, and a throttle limiting member attached to the variable throttle valve. and the gear lever of the continuously variable transmission for the traveling gear are interlocked,
1. A super pivot turning device in a traveling device equipped with a continuously variable transmission, characterized in that the throttle of a variable throttle valve is configured to be more limited as the traveling speed increases.