JPH0714126Y2 - Braking device for self-propelled vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a braking device for a self-propelled vehicle that can make a small turn using a single brake such as a speed sprayer, and more specifically, one brake pedal. Thus, the present invention relates to a braking device for a self-propelled vehicle in which one brake and both brakes can be selectively used.

[Conventional technology]

In the speed sprayer, it is effective to use a single brake to make a small turn during the spraying of the chemical solution.
Therefore, the left and right rear wheels can be individually operated.

Therefore, in the conventional speed sprayer, the left brake part and the right brake part for the left and right rear wheels can be operated individually. Therefore, the driver's seat has two brake parts, one for the left brake part and one for the right brake part. Brake pedals are provided and can be operated individually.

In addition, when braking on a general road other than the field, it is necessary to apply both brakes, so the left and right brake parts should be activated at the same time by connecting the left and right brake pedals with a connecting lever. I have to.

Further, in order to control the operation of the speed sprayer, there is a throttle lever in the driver's seat for controlling the throttle opening of the running engine and a speed change lever for controlling the reduction ratio of the rotational power from the running engine to the rear wheels. However, in the conventional speed sprayer, the throttle opening and the speed reduction ratio are independent without being linked with the operation of the brake pedal.

[Problems to be solved by the device]

The problems of such conventional techniques are listed below.

(A) Two brake pedals are required in the driver's seat, which increases the lateral width of the driver's seat and the lateral width of the speed player, which causes an increase in the minimum turning radius.

(B) In order to equalize the braking forces of the left and right brake parts when both brakes are used, the left and right brake pedals need to have the same step allowance, and the adjustment of the step allowance is complicated.

(C) To switch between one brake and both brakes,
Prior to driving, it is necessary to operate the connecting lever of the brake pedal in advance, which is complicated.

(D) During sudden braking, the brake pedal may be depressed before the clutch pedal is depressed.
When the throttle lever is in the high speed position, an excessive force is applied to the brake part, which tends to impair durability and the like.

An object of the invention of claim 1 is to provide a braking device for a self-propelled vehicle that can overcome the above problems (a) to (d).

[Means for Solving the Problems]

The invention will be described using the reference numerals of the drawings corresponding to the embodiments.

A braking device for a self-propelled vehicle (10) according to claim 1 has the following (a)-
It has the component (e).

(A) Hydraulic pressure generation means (30) for generating hydraulic pressure in accordance with operation of the brake pedal (28) (b) Left brake part (38a) which is supplied with hydraulic pressure and brakes the left and right rear wheels (14) respectively And right brake part (38
b) (c) Guide the hydraulic pressure from the hydraulic pressure generation means (30) to the left brake part (38a) only, the right brake part (38b) only, or both the left brake part (38a) and the right brake part (38b) 3 Switching valve (40) having individual switching positions (d) Brake switching operation member (42) for switching the switching position of this switching valve (40) (e) The switching valve (40) is connected to the hydraulic pressure generating means (30). When the brake pedal (28) is depressed at the switching position that guides the hydraulic pressure to both the left brake part (38a) and the right brake part (38b), the engine output reduction means (54) that reduces the output of the running engine is used. To have.

[Action]

In this invention, the driver of the self-propelled vehicle (10) operates the brake switching operation member (42) to switch the switching valve (40) to each switching position in switching between the single brake and the both brakes. When the switching valve (40) is in the switching position in which the hydraulic pressure from the hydraulic pressure generating means (30) is guided only to the left brake part (38a), the hydraulic pressure is left as the driver operates the brake pedal (28). It is supplied only to the brake part (38a), and only the left rear wheel (14) is braked by the left brake part (38a). Further, when the switching valve (40) is in the switching position for guiding the hydraulic pressure from the hydraulic pressure generating means (30) only to the right brake part (38b), the hydraulic pressure is increased as the driver operates the brake pedal (28). Is supplied only to the right brake part (38b),
Only the right rear wheel (14) is braked by the right brake part (38b). Further, the switching valve (40) has a hydraulic pressure generating means (3
0) is in a switching position that guides the hydraulic pressure to both the left brake part (38a) and the right brake part (38b), the hydraulic pressure changes to the left brake part (28) as the driver operates the brake pedal (28). 38a) and the right brake section (38b) are both supplied, the left and right rear wheels (14) are in a braking state, and the brake switching operation member (42) is in a position for using both brakes, That is, when the switching valve (40) is in the switching position that guides the hydraulic pressure from the hydraulic pressure generation means (30) to both the left brake part (38a) and the right brake part (38b), the engine output reduction means (54): When the driver depresses the brake pedal (28), the driving engine is forced to a low output state. As a result, the driving force of the rear wheel (14) is reduced, the load on the left brake portion (38a) and the right brake portion (38b) is reduced, and the deceleration effect of the rear wheel (14) is increased.

〔Example〕

 The present invention will be described below with reference to the embodiments shown in the drawings.

FIG. 3 is a schematic side view of the speed sprayer 10. The speed sprayer 10 includes a frame 16 that is supported by front wheels 12 and rear wheels 14 and is self-propelled.
On the upper side of the 16 is a driver's seat 18 in order from the front of the speed sprayer 10, a chemical liquid tank 20 for storing the chemical liquid, a bonnet 22 surrounding an engine room accommodating a running engine, a spray nozzle 24 for spraying the chemical liquid, and from the rear. A blower (26) is installed to discharge the sucked air to the nozzle (24).

FIG. 1 is a configuration diagram of a braking device of the speed sprayer 10. The brake pedal 28 is swingable and is depressed by the driver. The master cylinder 30 receives oil from the supply tank 32 and is operated in conjunction with the brake pedal 28, and when the brake pedal 28 is depressed, it sends hydraulic pressure to the discharge passage 34. The discharge passage 34 branches at its downstream end into a left brake fluid passage 36a and a right brake fluid passage 36b, and is connected to a left brake portion 38a and a right brake portion 38b via the left brake fluid passage 36a and the right brake fluid passage 36b. . The left brake part 38a and the right brake part 38b are respectively the left and right rear wheels 14
Brake. The electromagnetic switching valve 40 is provided at a location where the left brake portion 38a and the right brake portion 38b branch from the discharge passage 34, and the discharge passage 34, the left brake portion 38a, and the right brake portion 38b.
Switch connection with. Brake selector switch 42 is L,
It has three positions, C and R, and can be switched by the driver's manual operation. L, C, and R respectively correspond to the left one-side brake, both brakes, and the right one-side brake. The brake operation detection switch 44 is disposed so as to come into contact with the brake pedal 28 and turns on and off in relation to the depression operation of the brake pedal 28. The auxiliary transmission 46 is provided in a power transmission system from a running engine (not shown) to the rear wheels 14, and has a two-stage reduction ratio of a high speed stage and a low speed stage. The shift lever 48 has two positions, H and L, and can be switched by a manual operation of the driver. In H and L, the auxiliary transmission 46 has a high speed stage and a low speed stage, respectively. The high-speed stage detection switch 50 is arranged so as to contact the shift lever 48 at the H position, and the shift lever 48 is set to the H and L positions.
Are turned on and off respectively. Throttle lever
Reference numeral 52 is swingable by a driver's manual operation and controls the throttle opening of the traveling engine. The electromagnetic actuator 54 is capable of entraining the throttle lever 52 to a swing position where the running engine has a low throttle opening. The controller 56 sends a control signal to the electromagnetic switching valve 40 and the electromagnetic actuator 54 based on the input signals from the brake changeover switch 42, the brake operation detection switch 44 and the high speed stage detection switch 50.

FIGS. 2A to 2C show three switching positions of the electromagnetic switching valve 40. The discharge passage 34 is connected to both the left brake oil passage 36a and the right brake oil passage 36b in FIG. 2 (a),
In FIG. 2 (b), only the right brake oil passage 36b is connected,
In FIG. 2C, only the left brake oil passage 36a is connected.

The operation of the embodiment will be described.

When the shift lever 48 is in the L position, the left brake part 38a
And the right brake part 38b is L, C, R of the brake changeover switch 42.
Controlled in relation to the position of. During the spraying work, the speed change lever 48 is set to the L position. The electromagnetic changeover valve 40 has a brake changeover switch 42 which is controlled by a control signal from the controller 56.
When it is in L, C, R, it becomes the switching position of FIG. 2 (c), (a) and (b). Therefore, the driver depresses the brake pedal 28, and the master cylinder 30 releases the discharge passage.
When the hydraulic pressure is sent to 34, L of brake changeover switch 42,
Corresponding to each of C, R, hydraulic pressure is supplied only to the left brake part 38a, both of the left brake part 38a and the right brake part 38b, and only to the right brake part 38b, and the left one brake, both brakes, and One-sided braking on the right occurs.

When the shift lever 48 is in the L position, the auxiliary transmission 46 is in the low speed stage, and the driving force of the rear wheels 14 is large. In this device, the speed change lever 48 is in the L position and the brake changeover switch
When the brake pedal 28 is depressed when the brake pedal 42 is in the C position, the brake operation detection switch 44 is turned on, and the electromagnetic actuator 54 swings the throttle lever 52 to the low speed side by the control signal from the controller 56. As a result, when the output of the running engine is reduced and the clutch pedal is not depressed, the driving force of the rear wheels 14 is reduced, the load on the left brake portion 38a and the right brake portion 38b is reduced, and The deceleration of the wheel 14 becomes smooth. When the speed change lever 48 is in the H position, the controller 56 judges this by the input signal from the high speed stage detection switch 50, and the electromagnetic changeover valve 40 is turned on regardless of the position of the brake changeover switch 42 in FIG. ), That is, the discharge passage 34 is connected to both the left brake fluid passage 36a and the right brake fluid passage 36b. Therefore, when the brake pedal 28 is depressed, the hydraulic pressure sent from the master cylinder 30 to the discharge passage 34 passes through the left brake fluid passage 36a and the right brake fluid passage 36b to the left brake portion 38.
It is supplied to a and the right brake part 38b, and the left and right rear wheels 14 are simultaneously braked. As a result, even when the driver forgets to switch the brake changeover switch 42 to the C position and sets the speed change lever 48 to the H position and travels the speed sprayer 10 prior to high speed traveling on a general road or the like, The brake can be operated reliably.

[Effect of device]

In this invention, the supply of hydraulic pressure to the left brake part and the right brake part is switched by the switching valve, and the switching position of the switching valve is controlled by the operation of the brake switching operation member. Therefore, it is possible to selectively use one brake and both brakes with one brake pedal, the installation space for the brake pedal is reduced, and the lateral width of the driver's seat is reduced.
Further, the lateral width of the self-propelled vehicle can be reduced, and the minimum turning radius can be reduced. Further, the labor for adjusting the step allowance of the left and right brake pedals is omitted so that the left and right braking forces become equal, and the number of parts can be reduced by using one brake pedal and one hydraulic pressure generation means. Furthermore, the brake switching operation member can be operated at the driver's hand, as compared with the conventional technology in which one brake and both brakes are switched by operating the connecting lever of the brake pedal.
When the switching operation becomes simple and the braking operation by both brakes is performed, the output of the running engine is automatically reduced by the engine output reduction means, and the driving force of the left and right rear wheels is reduced. Even if the clutch pedal is forgotten to be operated during emergency braking or the like, it is possible to reduce the load on the left and right brake parts, extend their durability, and enhance the rear wheel deceleration effect.

[Brief description of drawings]

The drawings relate to an embodiment of the present invention, FIG. 1 is a block diagram of a braking device of a speed sprayer, FIGS. 2 (a) to 2 (c) are views showing three switching positions of an electromagnetic switching valve, and FIG. It is a schematic side view of a speed sprayer. 10 …… Speed sprayer (self-propelled vehicle), 14 …… Rear wheel, 28 …… Brake pedal, 30 …… Master cylinder (hydraulic pressure generation means), 38a ……
Left brake part, 38b ...... Right brake part, 40 ...... Electromagnetic switching valve (switching valve), 42 ...... Brake switching switch (brake switching operating member), 46 ...... Auxiliary transmission (transmission), 54 ...... Electromagnetic Actuator (engine output reduction means).

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A hydraulic pressure generating means (30) for generating hydraulic pressure according to the operation of a brake pedal (28), and a left brake part (38a) which is supplied with hydraulic pressure and brakes the left and right rear wheels (14) respectively. ) And the right brake part (38b) and the hydraulic pressure from the hydraulic pressure generating means (30) is applied to the left brake part (38a) only, the right brake part (38b) only, or the left brake part (3).
8a) and a switching valve (40) having three switching positions leading to both the right brake part (38b) and a brake switching operation member (42) for switching the switching position of the switching valve (40). And the switching valve (40) is the hydraulic pressure generating means (30).
When the brake pedal (28) is depressed at the switching position that guides the hydraulic pressure from the vehicle to both the left brake part (38a) and the right brake part (38b), the engine output is reduced. A braking device for a self-propelled vehicle, comprising a means (54).