JPH0719037U - Brake device for work vehicle - Google Patents

Abstract

(57) [Summary] [Purpose] The brake is activated even when the clutch pedal is accidentally stepped on during a steep downhill slope, etc. to prevent damage to the machine and improve safety. [Structure] An emergency brake device 90 is provided between a clutch pedal 16 on the left side of the machine body 5 and a brake system of a left brake pedal 17L of a brake mechanism 80. This emergency braking device 90 is provided with a clutch pedal 1 by operating a lever.
6 is unidirectionally connected to the connection fitting 81 of the brake mechanism 80 by the engagement plate 91 and the connection rod 92. If you want to operate the brake normally when going downhill, the clutch pedal 1
6 is inoperative, and when the clutch pedal 16 is erroneously stepped on, the brake is activated.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a brake device that enables emergency braking in a work vehicle such as a passenger rice transplanter by stepping on a clutch pedal.

[0002]

[Prior art]

 Passenger rice transplanters sometimes go up and down steep slopes such as when loading and unloading trucks. At this time, a person unfamiliar with handling the machine may accidentally step on the clutch pedal of the main clutch when braking on a downhill. When the clutch pedal is depressed when descending in this way, the main clutch is disengaged and the wheels are freed, which causes the riding rice transplanter to suddenly start running due to its weight, causing the wheels to crash into the ground and damage the machine. In the worst case, it may cause personal injury. Therefore, it is desirable to take measures to activate the emergency brake even if the clutch pedal is accidentally depressed in case of a dangerous situation such as a steep downhill.

[0003] Conventionally, as for a passenger rice transplanter in which a clutch and a brake are interlocked with each other, for example, there is a prior art disclosed in Japanese Patent Laid-Open No. 58-214471. In this prior art, the left and right rear axles are provided with clutches and brakes that individually or simultaneously stop them, and the main clutch is automatically disengaged when the clutches and brakes are simultaneously stopped. It is shown.

[0004]

[Problems to be solved by the device]

 By the way, in the above-mentioned prior art, when the clutches and brakes are normally simultaneously stopped, the engine can be automatically disconnected by disconnecting the main clutch to make a sudden stop. Therefore, it is not possible to obtain the braking effect when the clutch pedal is accidentally depressed during braking.

In view of such a point, the present invention can prevent the damage of the machine and improve the safety by operating the brake even when the clutch pedal is accidentally stepped on a steep downhill. An object of the present invention is to provide a brake device for a work vehicle that can be used.

[0006]

[Means for Solving the Problems]

 To achieve this object, the present invention is provided with a clutch pedal (16) and a brake pedal (17L, 17R), and by depressing the clutch pedal, the main clutch (36) of the drive system is engaged and disengaged, and the brake is also provided. In a work vehicle in which wheels are braked through a brake interlocking mechanism (80) by stepping on a pedal, a lever operation is performed between the clutch pedal (16) and the brake interlocking mechanism (80). The clutch pedal (16) and the brake interlocking mechanism (80) are connected to each other, and an emergency brake device (90) for braking by depression of the clutch pedal (16) is provided.

[0007]

[Action]

 In the present invention having the above-mentioned configuration, the emergency brake device (90) is released during normal traveling, so that the main clutch (36) is disengaged by the clutch pedal (16) and the braking operation by the brake pedal (17L, 17R) is performed. It is done separately. When the lever is operated during a steep downhill, the emergency brake device (90) connects the clutch pedal (16) and the brake interlocking mechanism (80). Therefore, even if an unfamiliar worker accidentally steps on the clutch pedal (16) during braking, the emergency braking device (90) can reliably prevent the vehicle body (5) from suddenly running due to the braking operation.

The reference numerals in parentheses are shown for reference and do not limit the configuration of the present invention in any way.

[0009]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. The overall configuration of the riding rice transplanter will be described with reference to FIGS. 5 and 6. The passenger rice transplanter 1 has an engine 2 mounted in the front, a mission case 3 is coupled to the rear of the engine 2, and the engine 5, the mission case 3, the frame 4 and the like constitute a machine body 5. Front wheels 6 and rear wheels 7 are arranged below and below the machine body 5, and operation sections 8 and seats 9 are arranged above and below the machine body 5. A rice planting device 11 is connected to the rear of the machine body 5 via an elevating link 10, and a planter 12 and a float 13 are attached to the lower part of the rice planting device 11.

A belt type continuously variable transmission 50 is arranged laterally of the engine 2 and the transmission case 3, and an axle 21 inside the front axle housing 20 projecting to the left and right of the transmission case 3 is connected to the front wheels 6. A propeller shaft 22 extends rearward from the rear of the mission case 3, and the propeller shaft 22 is connected to the rear wheel 7 via a rear axle housing 23, an axle 25 inside the rear mission case 24, and the like. A PTO shaft 26 extends rearward from the rear of the mission case 3, and the PTO shaft 26 is connected to the planter 12 via a drive shaft 27 so as to transmit power to the planter 12. This allows the worker to ride on the machine body 5 and travel back and forth, and perform rice planting work using the rice planting device 11.

The entire drive system will be described with reference to FIG. First, the belt type continuously variable transmission 50 is installed between the crankshaft 30 of the engine 2 and the main shaft 31 of the transmission case 3. In this continuously variable transmission 50, a drive side pulley 51 is provided on a crankshaft 30, a driven side pulley 52 is provided on a main shaft 31, and a belt 53 is wound around both pulleys. The movable sheave side of both pulleys 51, 52 is connected to a mechanical shift control actuator 54 that changes the pulley interval of both pulleys 51, 52 in an inverse relationship. Then, the actuator 54 is operated to change the ratio of the winding diameters of the two pulleys 51, 52 of the belt so as to continuously change the speed to the decelerated low speed stage and the increased high speed stage.

Inside the mission case 3, a main shaft 31, a planter shaft 32, and two speed change shafts 33, 34 are arranged in parallel, and an output shaft 35 is loosely fitted to the main shaft 31 so that a large number of shafts are provided between the both shafts 31, 35. A plate-type main clutch 36 is provided so as to engage and disengage. The output shaft 35 is connected to the planter shaft 32 via the stock exchange transmission 37. This inter-stock transmission device 37 is configured such that a gear 37a movably attached to the planter shaft 32 is meshed with a shift gear 37b or a gear 37c of the output shaft 35 having different numbers of teeth, so that the inter-stock transmission is performed with respect to the planter shaft 32. Can be configured. The planter shaft 32 is connected to the PTO shaft 26 via a torque limiter 38 and a direction changing bevel gear 39.

A forward / reverse switching device 40 is provided between the output shaft 35 and the transmission shaft 33. In this forward / reverse switching device 40, a slide gear 40a is movably provided on a speed change shaft 33, and the slide gear 40a is moved to the left side so as to mesh with the gear 40b of the output shaft 35 to be in the forward position and moved to the right side. Then, by engaging with the idler gear 40c of the planter shaft 32, it is set to the reverse position, and in the middle, it is switched to the neutral position where it does not mesh with any gear.

The speed change shaft 33 is connected to another speed change shaft 34 via a traveling speed change device 41 that shifts between high and low speed. The transmission shaft 34 is connected to the front wheels 6 via the final gear 42, the differential device 43, and the axle 21 so as to transmit power. Further, the variable speed shaft 34 is connected to the propeller shaft 22 by a bevel gear 44 that changes the direction, and the propeller shaft 22 is connected to the bevel gear 45 on the rear wheel 7 side, the left and right side clutches 46L and 46R, the left and right brakes 47L and 47R, and the final gear. It is also connected to the rear wheel 7 via the gear 48 and the axle 25 so as to transmit power.

Next, the operation system will be described. First, the shift lever 15 and the clutch pedal 16 are arranged on the left side of the mission case 3, and the left and right brake pedals 17L, 17R are arranged on the right side of the mission case 3. The left and right brake pedals 17L and 17R are provided with a connecting metal fitting 18 for integrally operating both pedals. By engaging the metal fittings 18, both pedals move integrally and are disengaged. Then, the pedals 17L and 17R can be operated separately. The speed change lever 15 is connected to the slide gear 40a of the forward / reverse switching device 40 by the speed change operation mechanism 60 so as to be switched to forward or reverse by operating in the left-right direction, and is connected to the actuator 54 of the continuously variable transmission 50. It is connected in such a manner that it can be continuously and continuously shifted to a low speed position and a high speed position by operating in the front-rear direction. The clutch pedal 16 is connected to the main clutch 36 by a clutch operating mechanism 70. The left and right brake pedals 17L and 17R are connected to the rear wheel brakes 47L and 47R by a brake interlocking mechanism 80. Further, between the clutch pedal 16 and the brake mechanism 80, an emergency brake device 90 is provided which operates by pressing the clutch pedal.

The clutch operating mechanism 70 will be described with reference to FIGS. 1 and 2. First, the clutch operating shaft 71 projects above the right side of the transmission case 3 and the release arm 72 rotates clockwise on the clutch operating shaft 71 so that the clutch case side of the main clutch 36 is moved and disconnected. Mounted on. Therefore, the clutch pedal 16 arranged on the left side of the mission case 3 is pulled to the right side by the rotary shaft 73 in the left-right direction of the machine body, and this rotary shaft 73 is connected to the release arm 72 via the arm 74 and the rod 75 when the pedal is depressed. The release arm 72 is connected so as to rotate clockwise.

The brake interlocking mechanism 80 will be described. The left and right brake pedals 17L and 17R on the right side of the machine body are adjacently arranged so that they can be depressed independently or simultaneously. The right brake system of the right brake pedal 17R is connected to the right brake 47R via a connecting fitting 81, a rod 82, etc. so that the brake operation is performed by depressing the pedal. The left brake system of the left brake pedal 17L is pulled to the left side of the machine by a shaft 83, and a connecting fitting 81 is attached to a lever 84 of this shaft 83 by a pin 85. The connecting fitting 81 is connected to a left brake 47L via a rod 82. , It is connected so that the same brake operation can be performed when the pedal is depressed.

The emergency brake device 90 is provided between the clutch pedal 16 and the left brake system by adjoining the left brake system. That is, an engaging plate 91 having a V-shaped groove 91a as shown in FIG. 3 is provided upright at the end of the clutch pedal 16. A connecting rod 92 is projectingly provided on the clutch pedal side of the connecting portion of the lever 84 and the connecting fitting 81 with one end rotatably attached by a pin 85, and a bolt 92a of the connecting rod 92 extends toward the engaging plate 91 side. ing. Here, a nut 92b is screwed only on one side of the bolt 92a, and the bolt 92a and the nut 92b engage with one of the grooves 91a. When the left brake pedal 17L is stepped on, the connecting rod 92 moves freely, and only when the clutch pedal 16 is stepped on, the connecting rod 92 connects the clutch pedal 16 and the connecting fitting 81 to move.

On the other hand, above the connecting rod 92, a guide 93 is provided so that an operating lever 94 can be operated up and down. The operating lever 94 is connected to the connecting rod 92 by a wire 95, and a spring 96 is urged to the opposite side of the connecting rod 92 from the wire 95, so that the connecting rod 92 is engaged with or released from the V-shaped groove 91a by lever operation. This is configured to be possible.

Next, the operation of this embodiment will be described. First, at the time of rice planting work in a field, an operator rides on the body 5 of the riding rice transplanter 1, sets the forward / reverse switching device 40 to the neutral position by the speed change lever 15, and sets the continuously variable transmission 50 to the low speed stage by the actuator 54. . When the engine 2 is operated, the power of the engine 2 is input to the drive side pulley 51 of the continuously variable transmission 50 by the crankshaft 30, and the drive speed of the low speed stage by the drive side pulley 51, the driven side pulley 52 and the belt 53 is changed. Output to the output shaft 35 via the main shaft 31 and the main clutch 36. When the dynamic force of the output shaft 35 is transmitted to the planter shaft 32 by the inter-stock transmission 37, the power is transmitted to the rice transplanting device 11 by the torque limiter 38, the bevel gear 39, the PTO shaft 26 and the like.

During normal traveling, the operation lever 94 of the emergency braking device 90 is operated as indicated by the alternate long and short dash line in FIG. 1 to pull the wire 95. Then, the bolt 92a of the connecting rod 92 is held in a state of being disengaged from the groove 91a of the engaging plate 91 of the clutch pedal 16, the clutch pedal 16 is disconnected from the connecting fitting 81 of the brake system, and the emergency braking is disabled. When the worker steps on the clutch pedal 16, the clutch operating mechanism 70 causes the release arm 72 and the clutch operating shaft 71 to rotate in the time direction, the main clutch 36 is disengaged, and the output shaft 35 is disengaged from the main shaft 31. To be separated. In this state, when the operator tilts the shift lever 15 to the right, for example, the shift operation mechanism 60 moves the slide gear 40a of the forward / reverse switching device 40 to the opposite left side, and the slide gear 40a is the gear of the free output shaft 35. 40b meshes with the forward position.

When the clutch pedal 16 is released after switching to the forward position, the main clutch 36 is connected and the gear shifting power of the main shaft 31 is transmitted to the gear shifting shaft 33 via the output shaft 35, the gear 40b, and the slide gear 40a. introduce. Then, the power of the speed change shaft 33 is transmitted to the speed change shaft 34 through the traveling speed change device 41, is transmitted from the speed change shaft 34 to the front wheels 6 through the final gear 42, the differential device 43, and the like, and further bevel gear 45, It is also transmitted to the rear wheel 7 via the propeller shaft 22 and the like. Therefore, the passenger rice transplanter 1 travels forward at a low speed of the low speed stage in a four-wheel drive state, and sudden start is prevented.

When an operator further tilts the shift lever 15 to the right while the vehicle is traveling forward, the shift operating mechanism 60 causes the actuator 54 of the continuously variable transmission to operate. Therefore, in the continuously variable transmission 50, the belt 53 moves toward the drive side pulley 51, and the belt winding diameter becomes large, so that the continuously variable gear shifts to the high speed gear side, and the increased gear shifting power is output. . For this reason, the riding rice transplanter 1 runs at a high speed, and the operating speed of the rice transplanter 11 also increases. Therefore, by moving forward at a predetermined speed and operating the rice transplanting device 11, rice transplanting work is properly performed.

When traveling backward, the worker once returns the speed change lever 15 to the low speed stage. Thereafter, the clutch pedal 16 is stepped on to disengage the main clutch 36, and the gear shift lever 15 is tilted to the left. The gear shift operation mechanism 60 moves the slide gear 40a of the forward / reverse switching device 40 to the right to engage the idler gear 40c. Then, the power of the output shaft 35 is reversely rotated by the inter-stock transmission 37, the idler gear 40c, and the slide gear 40a and transmitted to the transmission shaft 33 to be switched to the reverse position. At this time, since the continuously variable transmission 50 is in the low speed stage, the decelerated reverse rotation power is transmitted to the front wheels 6 and the rear wheels 7, and the passenger rice transplanter 1 travels backward by the low speed four-wheel drive again to make a sudden drive. Start is prevented. When the speed change lever 15 is tilted further forward even during the reverse running, the continuously variable transmission 50 continuously changes the speed to the high speed stage, and the increased and reverse power is transmitted to travel at a high speed.

When the operator steps on the left brake pedal 17L when turning left while running the above-mentioned riding rice transplanter, the shaft 83 of the left brake system of the brake mechanism 80 rotates, and the connecting fitting 81 causes the rod 82 to rotate. Is pulled to actuate the left brake 47L independently, which causes the body 5 to make a sharp turn to the left. Even when the right brake pedal 17R is depressed when making a right turn, the right brake 47R operates similarly and the body 5 makes a sharp turn to the right. When the aircraft is stopped, the left and right brakes 47L and 47R are simultaneously actuated by simultaneously stepping on both brake pedals 17L and 17R to stop the braking.

On the other hand, at the time of steep downhill slope such as loading / unloading onto / from a truck, the left and right brake pedals 17L and 17R are connected by the engaging metal fitting 18 so as to rotate integrally as in the case of traveling on the road. . In this state, the operating lever 94 of the emergency brake device 90 is operated as shown by the solid line in FIG. 1 to loosen the wire 95, and the bolt 96a of the connecting rod 92 and the nut 92b are engaged by the spring 96 so that the groove 91a of the engaging plate 91 is formed. Engage with. Then, when the worker depresses the left and right brake pedals 17L and 17R for braking, the left and right brakes 47L and 47R are operated by the brake mechanism 80. At this time, since the connecting rod 92 moves freely, the clutch pedal 16 is not operated and the main clutch 36 is held in the connected state. Therefore, when the engine is running, the engine brake works normally and you can slowly descend.

On the other hand, if an inexperienced worker mistakenly steps on the clutch pedal 16, the clutch operating mechanism 70 disconnects the main clutch 36 and the engine brake does not work, but the engagement plate 91 and the connecting rod 92 cause the left brake to disengage. The system connecting fittings 81 are connected to pull the rod 82, the left brake 47L is operated, and the left and right brake pedals 17L and 17R integrally formed by the shaft 83 and the engaging fitting 18 and the rod 82. The right brake 47R also operates via. Therefore, this brake operation prevents the passenger rice transplanter 1 from suddenly running and, for example, the wheel side from colliding with the ground.

Although the embodiment of the present invention has been described above, the configuration and the mounting position of the emergency braking device are not limited to this.

[0029]

[Effect of device]

 As described above, according to the present invention, a clutch pedal and a brake interlocking mechanism are connected between a clutch pedal and a brake interlocking mechanism in a work vehicle such as a passenger rice transplanter, and braking operation is performed by depressing the clutch pedal. Since the emergency brake device is installed, even if an unfamiliar worker accidentally steps on the clutch pedal when going down a steep slope, the emergency brake device can reliably brake the machine. It is possible to prevent damage and injury to persons.

Since the emergency brake device has a configuration in which the clutch pedal is deactivated when the brake is normally operated, the main clutch is always held in the engaged state. As a result, the engine brake works normally during engine operation, ensuring good braking performance on downhill slopes.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of an emergency brake device portion in a work vehicle according to the present invention.

FIG. 2 is a plan view of the same embodiment.

FIG. 3 is a front view of an engagement plate.

FIG. 4 is a development view showing a part of the entire drive system and operation system.

FIG. 5 is a side view of an example of a riding rice transplanter.

FIG. 6 is a plan view of a riding rice transplanter.

[Explanation of symbols]

 1 Work vehicle (passenger rice transplanter) 5 Airframe 7 Rear wheel 16 Clutch pedal 17L, 17R Brake pedal 36 Main clutch 80 Brake interlocking mechanism 90 Emergency brake device

Claims (2)

[Scope of utility model registration request] 1. A clutch pedal and a brake pedal are provided, the main clutch of a drive system is connected / disconnected by depressing the clutch pedal, and the wheels are braked via a brake interlocking mechanism by depressing the brake pedal. In the work vehicle comprising: between the clutch pedal and the brake interlocking mechanism,
A brake device for a work vehicle, comprising: an emergency brake device that connects a clutch pedal and a brake interlocking mechanism to provide a braking operation by depressing the clutch pedal. 2. The brake device for a work vehicle according to claim 1, wherein the emergency brake device operates freely when the brake pedal is depressed to maintain the main clutch in an engaged state.