JP2573945Y2 - Startup safety device for vehicles equipped with a ring cone type continuously variable transmission - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a vehicle equipped with a planetary cone type continuously variable transmission (for example, an agricultural work vehicle such as a combine).
The starting safety device.

(B) Conventional technology Most conventional continuously variable transmission vehicles are constructed by incorporating a hydraulic continuously variable transmission such as an HST hydraulic unit in a drive unit drive system. Due to the nature of the step transmission, it is not possible to fix the vehicle body to a completely stopped state by itself, so a mechanical parking brake different from the continuously variable transmission must be incorporated in the driving unit drive system, and the driving unit drive system It was complicated and large.

As a transmission having a continuously variable transmission directly connected to an engine, there is "JP-A-61-92355", and a technology having a planetary cone-type continuously variable transmission has also become known by the present applicant. I have. For example,
And Japanese Utility Model Application Laid-Open No. 62-44775.

As the above technology, a planetary cone type continuously variable transmission is interposed at the input of the transmission to form a drive unit drive system, and the planetary cone type continuously variable transmission alone has a self-locking function to completely stop the vehicle body. To make the traveling unit drive system compact and compact.

(C) Problems to be solved by the invention By the way, the previous proposal eliminates the need for a parking brake in the drive unit drive system and achieves compactness and compactness. There was a problem.

When the transmission section (the transmission ring that frictionally engages with the planetary cone) of the planetary cone-type continuously variable transmission is moved while the traveling drive system is stopped, the gearshift operation is difficult because the operating resistance is large. In this case, the speed change section and the speed change operation section must be strong enough to withstand a large operating resistance, so that they have become large.

In addition, when the engine is stopped in a state where the transmission section of the planetary cone type continuously variable transmission section is in a transmission position other than the neutral position, if the engine is restarted carelessly, the vehicle body suddenly starts unexpectedly and is dangerous. is there.

The present invention relates to a vehicle equipped with a planetary cone-type continuously variable transmission, which is driven by a planetary cone-type continuously variable transmission in a state in which the engine is rotating even when the engine is rotating. Since the driving force of the engine is transmitted to the cone-type continuously variable transmission, the operation of the transmission ring can be operated with a light operation force, and the transmission section and its operation section can be reduced in size, and when the engine is started. It is an object of the present invention to provide a start-up safety device capable of reliably preventing an unexpected sudden start of a vehicle body.

(D) Means for Solving the Problems A continuously rotating planetary cone type continuously variable transmission (4) having an input portion of an axle drive gear mechanism (4) having a forward / reverse switching gear portion (6) and a steering gear (5) portion. 9), the input shaft (10) of the continuously variable transmission (9) is interlockedly connected to the output shaft of the engine (11) without a clutch, and the transmission ring operating tool (9) of the continuously variable transmission (9) is connected. 17) includes a hydraulic cylinder (1) that expands and contracts with the discharge oil of a hydraulic pump (42) directly connected to the engine (11).
8) is connected via a hydraulic circuit (40), and further, a stop position control feedback mechanism (26) composed of a switch holder (39) is connected, and the intermittent operation of the steering gear (5) is operated. The steering gear (5)
A switch (45) for connecting the starting circuit (44) of the engine (11) to a starting state when the switch is operated to the cutting position.

(E) Function In the device configured as described above, the input shaft of the planetary cone type continuously variable transmission (9) always rotates when the engine (11) operates, and the hydraulic pump ( 42) also rotates, but if the speed change operation lever (8) is located at the neutral position, the speed change ring operating tool (17) is moved to and maintained at the non-output position by the hydraulic cylinder (18) connected thereto, Since the planetary cone type continuously variable transmission is in a non-output state, the axle drive gear mechanism (4) remains stopped.

That is, the vehicle body is fixed in the stopped state by the self-locking action of the stopped planetary cone type continuously variable transmission.

When the vehicle body is started from the above-mentioned stopped state, the speed change lever (8) in the neutral position is moved forward or backward by an arbitrary amount to adjust the speed in a stepless manner. The input shaft (10) of the step transmission (9) is connected to the engine (11) with no clutch and is constantly rotating. The operation resistance applied to the shift ring operating tool is small, so that the operation is light and the operation resistance is small. Therefore, the speed change portion and the operation portion of the continuously variable transmission are also reduced in size and have sufficient durability.

Thus, if the speed change lever (8) is moved forward or backward, the hydraulic circuit (40) operates to operate the hydraulic cylinder (18) and move the speed change ring operating tool (17). When the speed change operation lever (8) is stopped at a desired speed change position, a feedback mechanism (26) for stopping position control is performed.
The switching of the hydraulic circuit (40) is stopped by the signal of (1), the hydraulic cylinder (18) stops, and the desired speed state is maintained.

If the engine (11) stops unexpectedly while the vehicle body is moving due to the shift operation described above, the engine must be restarted. In this case, the shift operation lever is required. (8) is returned to the neutral position, but since the engine is stopped, the hydraulic pump (42) in the hydraulic circuit (40) does not operate, so that the transmission ring of the planetary cone-type continuously variable transmission (9) advances. Although the gearshift position is maintained, the engine start circuit (44)
Must be operated when the steering gear (5) in the axle drive gear mechanism (4) is operated to disconnect the steering gear (5) to the steering gear cutting position. The steering gear (5) is cut off, and the vehicle does not advance.

Therefore, even if the planetary cone-type continuously variable transmission (9) is in a shift state in which the vehicle advances, the sudden start of the vehicle by the engine start can be reliably prevented.

As soon as the engine (11) is started, the hydraulic pump (42) is activated, and the hydraulic piston (18) is brought into the neutral state by the hydraulic circuit (40) controlled by the signal of the position control feedback mechanism (26). Since the gear ring is returned to return the speed change ring of the planetary cone type continuously variable transmission (9) to the non-output position, the pedal or the like maintained at the steering gear section cutting position (7)
Even if the vehicle is returned, the vehicle does not suddenly start and is safe.

(F) Example An example will be described with reference to the drawings.

FIG. 1 is a schematic perspective view of a starting safety device according to the present invention;
FIG. 2 is a transmission sectional diagram.

The planetary cone type continuously variable transmission indicated by reference numeral (1) in the drawing is disposed at a predetermined position of the vehicle, and includes a left and right axle (3) supported at a lower portion of a transmission case (2). An axle drive gear mechanism (4) for transmitting power to (3) is housed inside.

The axle drive gear mechanism (4) includes the left and right axle (3)
A steering gear (5) (5) of a side clutch / brake type for operating (3) and a forward / reverse switching gear unit (6) for rotating the left and right axles (3) and (3) forward and reverse; The steering gears (5) and (5) are connected to an intermittent operation tool (pedal or operating rod 7) mounted on the driving unit of the vehicle so as to be able to operate intermittently and separately. (6) is connected so that it can be switched to a forward rotation or a reverse rotation state by a speed change operation lever (8) provided in a driving section of the vehicle.

A planetary cone-type continuously variable transmission (9) is installed at an input portion of the entire axle drive gear mechanism (4), and its input shaft (10) is connected to an output shaft of an engine (11) mounted on the vehicle. They are linked by a clutch.

Planetary cone type continuously variable transmission (9) and the input shaft (10)
The input disk (12) integrally connected to the planetary cone (1
3) While frictionally engaging the input-side friction transmission surface, the output disk (15) on the output shaft (14) side is frictionally engaged with the output-side friction transmission surface of the planetary cone (13). 1
The transmission ring (16) is frictionally engaged with the conical surface of (3), and the transmission ring actuating tool (17) related to the transmission ring (16) is moved by the expansion and contraction operation of the hydraulic cylinder (18). The power transmitted from the input shaft (10) to the output shaft (14) is continuously changed from 0 (no output state) to the maximum speed, and the power taken out to the output shaft is transmitted to the axle drive gear mechanism ( 4) It is configured to be able to transmit to the input unit, and the expansion and contraction operation of the hydraulic cylinder (18), that is, the movement of the transmission ring (16) can be performed by operating the above-described transmission operation lever (8). It is being done.

The shift operation lever (8) is, as seen in FIG.
The guide plate (19) is pivotally supported so that it can be turned in the cross direction about its mutually perpendicular axis. The guide plate (19) communicates with the neutral groove (20) from both ends in the direction orthogonal to the neutral groove (20). It is provided so as to be able to move along the front and rear speed change grooves (21) and the reverse speed change groove (22).

An operating body (25) connected to a switching lever (23) of the forward / reverse switching gear section (6) by a communication tool (24) is interposed between the lower forked portion of the shift operation lever (8). When the speed change operation lever (8) is turned left and right along the neutral groove (20), the operating body (25) is turned left and right and the forward / reverse switching gear portion (6) is switched. I have.

Also, on both sides of the shaft support portion of the shift operation lever (8),
Actuating levers (27) and (28), which are components of a stop position control feedback mechanism (26) for stopping the hydraulic cylinder (18) at a required position, are pivotally supported.

When the shift operation lever (8) is turned to the left end of the neutral groove (20), the left projection (29) attached to the shift operation lever (8) engages with the left operation lever (27). When the shift operation lever (8) is turned to the right end of the neutral groove (20), the right projection (30) attached to the shift operation lever (8) engages with the right operation lever (28). When the shift operation lever (8) moves along the forward shift groove (21), the right operating lever (28) rotates according to the amount of movement.

The left and right operating levers (27) and (28) have connecting devices (31) and (32)
The other end of each of the connecting members (31) and (32) is connected to a rotating main cylinder (33) rotatably supported on a main shaft of a stop position control feedback mechanism (26). A fan-shaped switch operating body (34) is fixed to the moving main cylinder (33).

Another rotating cylinder (35) is coaxially supported adjacent to the rotating main cylinder (33), and one end of the rotating cylinder (35) is extended and retracted by the hydraulic cylinder (18). The other end of the interlock (36) adjacent to the section is connected, and is configured to rotate the rotating cylinder (35) in both forward and reverse directions according to the amount of expansion and contraction of the hydraulic cylinder (18).

A switch holding body (37) having a substantially similar shape to the switch operating body (34) is fixedly provided at another position of the rotary cylinder (35), and the switch operating body is attached to the holding body (37). Microswitches (38) and (39) to be connected when contacting the switch operation surface of the body (34) are arranged at a predetermined interval.

The micro switches (38) and (39) are connected to a control section of a solenoid valve (41) of a hydraulic circuit (40) for operating the hydraulic cylinder (18), and one of the micro switches (38) is a switch operating body (34). When it is connected by the control unit, a signal of the hydraulic cylinder extending movement is given to the control unit, and the other micro switch (39) is operated by the switch operating body (3).
When connected by 4), a signal of the hydraulic cylinder contraction movement is given to the control unit, and both micro switches (38) (39)
When both are in contact with the switch operating body (34), the expansion and contraction of the hydraulic cylinder (18) is stopped.

When the hydraulic cylinder (18) expands and contracts, the movement is fed back to the rotating cylinder (35) via the connecting member (36), and the shift operation lever (8) is stopped at an arbitrary shift position or neutral position. And both micro switches (38)
(39) Hydraulic cylinder (18) until both are disconnected
Are expanded and contracted, that is, the rotating cylinder (35) is rotated, and the operation of the hydraulic cylinder (18) is stopped.

The hydraulic circuit (40) that operates the hydraulic cylinder (18)
Is configured to include a constantly rotating hydraulic pump (42) directly connected to the output section of the engine (11).

The electric circuit (44) for operating the cell starter (43) of the engine (11) includes a switch (45) that is connected and operated when the pedal or the like (7) is moved to the steering gear cutting position. When the starter key (46) is operated when the switch (45) is not connected, the engine cannot be started.

Other reference numerals (47) in the figure are the input pulley of the planetary cone type continuously variable transmission, (48) is the PTO pulley, (4)
9) denotes a steering brake attached to the steering gear unit, and (50) denotes a crawler traveling drive sprocket fitted to the axle.

(G) Effects of the Invention Since the invention is configured as described above, the following effects can be obtained.

Includes a hydraulic pump (42) that directly connects the engine with the shifting ring operating tool (17) of the planetary cone-type continuously variable transmission (9) that is incorporated into the input portion of the axle drive gear mechanism (4) and directly connected to the engine output shaft And a hydraulic circuit (18) connected to a hydraulic circuit (40) controlled by a stop position control feedback mechanism (26). The starting circuit (44) of the engine (11) includes: A switch (45) that incorporates a switch (45) that can be started when a pedal or the like (7) for intermittently operating the steering gear section (5) in the axle drive gear mechanism (4) is operated to the steering gear section cutting position. As a result, the planetary cone continuously rotates when the engine is running even when the vehicle is stopped, while the transmission has a simple and compact structure with a parking brake function using only the planetary cone type continuously variable transmission. The operating resistance of the transmission ring (16) of the planetary cone-type continuously variable transmission (9) is reduced, enabling light shifting operation. High strength and durability are ensured, and the whole can be made more compact.

When the engine is to be started, the starting circuit (44) does not work unless the pedal or the like (7) is operated to the steering gear cutting position, so that the transmission ring of the planetary cone-type continuously variable transmission is not operated. If the engine is started in a position other than the neutral position and the vehicle starts suddenly, it is reliably avoided that the transmission ring in the position other than the neutral position stops after the engine is started. Since the hydraulic cylinder (18) controlled by the position control feedback mechanism (26) is returned to the non-output position by operation of the hydraulic cylinder (18), the vehicle body does not suddenly start even when the pedals (7) are returned, and is safe. Is secured.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a starting safety device according to the present invention, FIG.
The figure is a transmission sectional view, and FIG. 3 is a partially cutaway sectional view of a planetary cone type continuously variable transmission. (4) axle drive gear mechanism, (5) steering gear section (6) forward / reverse switching gear section, (7) pedal, etc. (8) speed change lever (9) … Planetary cone type continuously variable transmission (10)… Input shaft, (11)… Engine (17)… Transmission ring actuator, (18)… Hydraulic cylinder (26)… Stop position control feedback mechanism ( 40) Hydraulic circuit (42) Hydraulic pump (44) Starting circuit (45) Switch

Claims (1)

(57) [Scope of request for utility model registration] 1. A forward / reverse switching gear section (6) and a steering gear (5).
A continuously rotating planetary cone type continuously variable transmission (9) is installed at an input portion of an axle drive gear mechanism (4) having a section, and an input shaft (10) of the continuously variable transmission (9) is connected to an engine (11). The output shaft is interlocked and connected without a clutch, and the transmission ring operating tool (17) of the continuously variable transmission (9) expands and contracts by the discharge oil of a hydraulic pump (42) directly connected to the engine (11). The hydraulic cylinder (18) to be connected is connected via a hydraulic circuit (40), and further, a feedback mechanism (26) for a stop position control composed of a switch holder (39) is connected, and the steering gear (5) section is connected. The switch (45) for connecting the starting circuit (44) of the engine (11) to the starting state when the steering gear (5) is operated to the disengaged position is included in a pedal or the like (7) for operating the intermittent operation. Starting a vehicle with a planetary cone continuously variable transmission Safety device.