JP2627677B2 - Braking device for self-propelled vehicles - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake device for a self-propelled vehicle, such as a speed sprayer, which can selectively use one brake and both brakes. The present invention relates to a brake device capable of changing a braking force with the brake.

[Conventional technology]

A speed player or the like is provided with an auxiliary transmission in addition to the main transmission, so that one brake and two brakes can be selectively used. That is, when working in the field, the auxiliary transmission is switched to the low gear, and at the time of turning, a small turn is achieved by using a one-side brake that brakes only the wheels (normal, rear wheels) inside the turning direction, When traveling on a general road, the sub-transmission is switched to the high speed stage, and when braking by the speed player, the speed player is quickly decelerated by both brakes.

In a conventional braking device such as a speed sprayer, the braking force generated on each wheel is equal for both the one brake and both brakes.

[Problems to be solved by the invention]

Problems of such a conventional brake device for a self-propelled vehicle are as follows.

(A) Since the braking force required for each wheel is three to five times greater at the time of one brake than at the time of both brakes, the driver must adjust the depression force of the brake pedal at the time of one brake and at the time of both brakes. , It becomes complicated.

(B) Since the one-brake is frequently used during work in the field, it is desirable that the brake pedal depressing force at the time of one-brake be as small as possible. Needs to be increased, and in the event of both brakes, the braking force is too large, resulting in sudden braking. Also,
In order to withstand such braking, it is necessary to increase the strength of the drive unit and the various parts of the vehicle body and to design them.

It is an object of the present invention to provide a brake device for a self-propelled vehicle that can overcome the above-mentioned problems.

Another object of the present invention is to make it possible to switch the braking capacity of the brake body by a common brake portion.

[Means for solving the problem]

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

In the brake device for a self-propelled vehicle (10), the left and right wheels (14) can be braked individually and together for use of a single brake and both brakes. And the speed change member (38) has a low-speed position and a high-speed position in accordance with the use of both brakes, respectively.
The traveling speed is switched between high speed and low speed at the low speed position and the high speed position of the transmission member (38). The brake device for the self-propelled vehicle (10) according to claim 1 interlocks with the transmission member (38) to increase and decrease the braking force of the wheels (14) at the low speed position and the high speed position of the transmission member (38), respectively. And a brake body (42) to be driven.

In the brake device for a self-propelled vehicle (10) according to the second aspect, the brake body (42) transmits the rotation of the wheels (14) to the brake shaft (88) in conjunction with the low speed position and the high speed position of the transmission member (38). It has a transmission unit (66) for transmitting at high speed and low speed, respectively, and a brake unit (68) for braking the brake shaft (88).

[Action]

The brake device for a self-propelled vehicle (10) according to claim 1,
Under the situation where the one-side brake is used, the speed change member (38) is at the low speed position. The brake body (42) increases the braking force of the wheels (14) in conjunction with the transmission member (38),
At the time of one-sided brake operation, the wheel (14) is braked with a large braking force.

In situations where both brakes are used, the transmission (38)
Is the high-speed position. The brake body (42) reduces the braking force of the wheel (14) in conjunction with the speed change member (38), and brakes the wheel (14) with a small braking force during a single brake operation.

According to the second aspect of the present invention, when the speed change member (38) is at the low speed position, the speed change portion (66) transmits the rotation of the wheel (14) to the brake shaft (88) at high speed. During one-sided brake operation, the brake part (68) brakes the brake shaft (88), whereby the braking of the brake shaft (88) is transmitted to the wheels (14) with a large torque via the transmission part (66). The braking force of the wheel (14) increases.

At the high speed position of the transmission member (38), the transmission section (66) transmits the rotation of the wheel (14) to the brake shaft (88) at a low speed. During both brake operations, the brake part (68) brakes the brake shaft (88), whereby the braking of the brake shaft (88) is transmitted to the wheels (14) with a small torque via the transmission part (66). The braking force of the wheel (14) decreases.

〔Example〕

 Hereinafter, the present invention will be described with reference to embodiments of the drawings.

FIG. 2 is a configuration diagram of a power transmission device and a brake device of the speed sprayer 10. Speed sprayer 10
A front wheel 12 and a rear wheel 14 as driving wheels are provided on the left and right, and the front wheel 12
And by driving the rear wheels 14, it is free to run. The main transmission 16 is disposed below the driver's seat 18 beside the driver's seat 18 and can be switched to various speed ratios by a main transmission shift lever in the driver's seat 18. The rotational power of the engine (not shown) is transmitted to the auxiliary transmission 22 at the center of the speed sprayer 10 via the main transmission 16 and the propeller shaft 20, and is distributed from the auxiliary transmission 22 to the front and rear. The rotational power distributed to the front side of the auxiliary transmission 22 is transmitted to a front differential device 26 via a front propeller shaft 24, and the differential device
The power is transmitted to the left and right front wheels 12 from the left and right front axles 28. The rotational power distributed to the rear side of the auxiliary transmission 22 is transmitted to a rear differential device 32 via a rear propeller shaft 30 and transmitted from the rear differential device 32 to left and right rear wheels 14 via left and right rear axles 34.
The driver's seat 18 is provided with an auxiliary transmission lever 38 in addition to a steering wheel 36 for steering the speed sprayer 10, and the swing displacement of the auxiliary transmission lever 38 is controlled by a rod 40 through the auxiliary transmission. The transmission is transmitted to the sub transmission 22 to switch the sub transmission 22 to a low speed stage and a high speed stage. The brake body 42 is disposed on each rear wheel 14, and is connected to a sub-transmission lever 38 via a push-pull wire 44.
The swing displacement of the rear wheel 14 is transmitted when the left and right brake pedals (not shown) of the driver's seat 18 are depressed.
Are individually braked.

FIG. 3 is a detailed view of a connection structure between the sub-transmission lever 38, the sub-transmission 22, and the brake body 42. The sub-transmission lever 38 is swingable about a fulcrum 46, the sub-transmission 22 is switched between a low speed stage and a high speed stage by the displacement of the shifter 46, and the rod 40 has ball ends 50, 52 at both ends. It is rotatably connected to the lower end portion of the sub-transmission lever 38 and the shifter 48 through the same. The brake body 42 performs braking and braking release in relation to the displacement of the shifter 54, and the push-pull wires 44 are connected to the lower end of the sub-transmission lever 38 and the shifter 54 at both ends.

FIG. 1 is a detailed structural view of the brake body 42. The axle 56 of the rear axle 34 is splined with a wheel hub 58 at an end, and the nut 60 is screwed to the end of the axle 56 to tighten the wheel hub 58. The wheel disc 62 of the rear wheel 14 is applied to the wheel hub 58 at the inner peripheral portion, and is fixed to the wheel hub 58 by a plurality of bolts 64.

The brake body 42 has a transmission section 66 and a wet brake section 68. In the transmission section 66, the case 70 rotatably supports the axle 56 of the rear access 34 by two ball bearings 72, and a seal 74 is provided between the case 70 and the axle 56 on the outside of each ball bearing 72 in the axial direction. It is inserted between and holds the seal. The input gears 76 and 78 are rotatably supported on the axle 56 via a needle bearing 80, and the clutch gear 82 is disposed between the input gears 76 and 78 and is displaced in the axial direction by a spline groove 84 of the axle 56. It fits freely, rotates integrally with the axle 56, and displaces in the axial direction with the displacement of the shifter 54. The input gears 76 and 78 are provided at opposing portions of the clutch gear 82 with pawl gears 86 that can freely engage with the clutch gear 82.
have. The brake shaft 88 is disposed in parallel with the axle 56, and is rotatably driven by a ball bearing 90.
Supported by 70. The output gears 92 and 94 are connected to the brake shaft 88
, And are engaged with input gears 76 and 78, respectively. The input gear 76 has a larger diameter than the input gear 78, and the output gear 92 has a smaller diameter than the output gear 94. Therefore, when the clutch gear 82 is engaged with the pawl gear 86 of the input gears 76, 78, the rotation of the axle 56 is transmitted to the brake shaft 88 at high speed and low speed, respectively. In the wet brake section 68, a plurality of disks 96
A plurality of plates 98 are axially displaceable and integrally rotatably fitted to 88, and a plurality of plates 98 are disposed between the discs 96, and are axially mounted on the outer periphery of the inner periphery of the case 100 of the wet brake unit 68. Displaceably fitted. The piston 102 is mounted on the driver's seat 18
When the brake pedal is depressed, the disk 96 and the plate 98 are displaced in the axial direction by the hydraulic pressure supplied to press the disk 96 and the plate 98 mutually in the axial direction. When the disc 96 and the plate 98 are pressed against each other, the brake shaft 88
And, it is connected to the case 100 via the plate 98, and the rotation is braked.

 The operation of the embodiment will be described.

At the time of spraying the chemical solution in the field, the left and right brake pedals of the driver's seat 18 are released from connection by a connection member (not shown), and can be individually operated. The sub transmission lever 38 is set to the low speed position. The displacement of the auxiliary transmission lever 38 is transmitted to a shifter 48 of the auxiliary transmission 22 and a shifter 54 of the brake body 42 via a rod 40 and a push-pull wire 44, respectively. As a result, the sub transmission 22 is set to the low speed stage,
The speed sprayer 10 travels at a low speed, and in the brake body 42, the clutch gear 82 meshes with the claw gear 86 of the input gear 76, and the rotation of the axle 56 of the rear axle 34 is transmitted to the brake shaft 88 at a high speed. When one of the left and right brake pedals is depressed in order to turn the speed sprayer 10 using the one-sided brake, hydraulic pressure is supplied to the wet brake portion 68 of the brake body 42 on that side. The piston 102 is displaced, and the brake shaft 88 is braked by the mutual pressing of the disk 96 and the plate 98. The braking of the brake shaft 88 is performed by the output gear 92 and the input gear 76.
Is transmitted to the axle 56 with a large torque through
One of the rear wheels 14 is braked with a large braking force.

When traveling on a general road, the left and right brake pedals of the driver's seat 18 are mutually connected by a connecting member (not shown), and are generally operated. The sub transmission lever 38 is set to the high speed position. The displacement of the sub-transmission lever 38 is controlled by the rod 40 and the push-pull wire 44, respectively.
To the shifter 48 of the brake body 42. As a result, the sub-transmission 22 is set to the high speed stage, the speed sprayer 10 travels at high speed, and the clutch gear 82 in the brake body 42 is the pawl gear 86 of the input gear 78.
The rotation of the axle 56 of the rear axle 34 is transmitted to the brake shaft 88 at a low speed. When the speed sprayer 10 is decelerated, the left and right brake pedals are displaced together, hydraulic pressure is supplied to the wet brake units 68 of the left and right brake bodies 42, and the pistons 102 are displaced in the left and right wet brake units 68, and the discs are displaced. The mutual pressing of the plate 96 and the plate 98 brakes the brake shaft 88. The braking of the brake shaft 88 is carried out with a small torque via the output gear 94 and the input gear 78.
Thus, the left and right rear wheels 14 are braked with a smaller braking force than in the case of single braking.

〔The invention's effect〕

According to the first aspect of the present invention, the brake body interlocks with the low-speed position and the high-speed position of the displacement member to increase or decrease the braking force of the wheels, that is, to individually brake the left and right wheels (in the case of single braking). ) When the braking force is large and when the left and right wheels are braked together (when both brakes are applied)
, The braking force can be switched to a small value. Therefore, the invention of claim 1 has the following effects.

(A) The driver can save the trouble of adjusting the braking operation force in order to make a difference in the braking force between the one-time braking and the two-time braking.

(B) The brake operation force by the driver at the time of one brake can be made as small as at the time of both brakes while avoiding the generation of a large brake force at the time of both brakes.

(C) It is possible to avoid the occurrence of excessive braking as in the case of single braking during both brakes, so that it is possible to omit an increase in the strength of the drive unit and various parts of the vehicle body for dealing with excessive braking. .

In the invention of claim 2, the rotation of the wheel is transmitted to the brake shaft at high speed and low speed at the low speed position and the high speed position of the transmission member, respectively, and the brake unit brakes the brake shaft to increase the braking force of the wheel, respectively. Switch to small. Therefore, the brake unit can be shared.

[Brief description of the drawings]

1 is a detailed structural view of a brake body, FIG. 2 is a structural view of a power transmission device and a brake device of a speed sprayer, and FIG. 3 is a shift lever for an auxiliary transmission and an auxiliary transmission. FIG. 3 is a detailed view of a connection configuration between a transmission and a brake main body. 10: Speed sprayer (self-propelled vehicle), 34: Rear wheel (wheel), 38: Shift lever for auxiliary transmission (transmission member),
42 ... Brake body, 66 ... Transmission unit, 68 ... Wet brake unit (brake unit), 88 ... Brake shaft.

Claims (2)

(57) [Claims] The left and right wheels (14) can be braked individually and together for use of a single brake and a double brake, respectively. 38) has a low-speed position and a high-speed position, and the low-speed position and the high-speed position of the transmission member (38) are such that the traveling speed is switched between high-speed and low-speed. 38. A self-propelled vehicle comprising: a brake body (42) that works together with the transmission member (38) to increase and decrease the braking force of the wheels (14) at a low speed position and a high speed position of the transmission member (38), respectively. Vehicle braking device. 2. The brake body (42) interlocks with the low speed position and the high speed position of the speed change member (38).
4) a transmission unit (66) for transmitting the rotation of (4) to the brake shaft (88) at high speed and low speed, respectively, and a brake unit (68) for braking the brake shaft (88). The brake device for a self-propelled vehicle according to claim 1.