JP6821129B2 - Work vehicle - Google Patents

Description

The present invention relates to a work vehicle such as an agricultural tractor, and more particularly to a brake interlocking configuration including a parking brake.

Conventionally, in a braking device for an agricultural tractor, there is a configuration in which a parking brake lever (parking lever) and a brake pedal are connected to enable two systems of brake operation (for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2008-273367

According to the configuration of Patent Document 1, the left and right brake operating rods are arranged on both sides of the transmission case, the front part is connected to the brake pedal, and the rear part is the left and right brake mechanism so as to be connected to both the parking lever and the brake pedal. The lateral interlocking shaft is arranged below the transmission case, the lower part of the arm whose upper part is connected to the brake operating rod is pivotally attached to the lateral interlocking shaft, and the operation arm connected to the parking lever is attached to one side. When the operating arm is operated to the braking side by the parking lever, the operating force is transmitted to the brake operating rod on one side, and this operating force is transmitted to the lateral interlocking shaft and the other side. It is configured to be transmitted to brake the brake operating rod on the other side via the operating arm of.

For this reason, the two operating systems can be arranged separately at separate positions while avoiding the centralized arrangement of the brake pedal and the parking lever, but the parts constituting the connecting means for operating one brake operating rod from the parking lever are complicated. It occupies a part of the space on the side of the mission case. Since many devices such as hydraulic valves are installed on the side surface of the mission case, if the space is narrowed, it becomes difficult to assemble and adjust each part, which may have an unfavorable effect such as an increase in manufacturing cost.

An object of the present invention is to provide a work vehicle capable of reducing the installation space of the brake configuration in view of such problems of the conventional work vehicle.

The present invention has taken the following technical measures to solve the above problems.

The invention according to claim 1 includes left and right brake mechanisms (17L, 17R) for braking the rear wheels, and a brake pedal (23L, 22R) on a brake arm (22L, 22R) interlocking with the brake mechanism (17L, 17R). In a work vehicle connecting the first brake rod (29L, 29R) operated by) and the second brake rod (36L, 36R) operated by the parking lever (31).
A pedal interlocking shaft (26) that rotates by depressing the brake pedal (23) is provided, the first brake rods (29L, 29R) are connected to the pedal interlocking shaft (26), and the parking lever (31). ) Is provided, and the second brake rod (36L, 36R) is connected to the lever interlocking shaft (32), and the first brake rod (29L, 29R) is connected to the lever interlocking shaft (32). And the second brake rod (36L, 36R) are arranged substantially in parallel.
The first support cylinder (25) that supports the pedal interlocking shaft (26) is attached to the lower surface of the mission case (5), and the second support cylinder (30) that supports the lever interlocking shaft (32) is attached to the first support cylinder. Arranged behind (25), the brake pedal (23) is connected to the pedal interlocking shaft (26), left and right pedal arms (28L, 28R) are provided, and the parking interlocking arm (32) is connected to the lever interlocking shaft (32). 33) is connected and left and right lever arms (35L, 35R) are provided, and the left and right pedal arms (28L, 28R) and the left and right brake arms (22L, 22R) are connected by the first left and right brake rods (29L, 29R). Then, the left and right lever arms (35L, 35R) and the left and right brake arms (22L, 22R) are connected by the second left and right brake rods (36L, 36R).
The first support cylinder (25) is connected to the lower surface of the mission case (5) via brackets (25a, 25a), and the second support cylinder (30) is attached to the first support cylinder (25). It is characterized in that it is connected and held by holding plates (25b, 25b).
The invention according to claim 2 comprises a turnbuckle-shaped first length adjusting means (29aL, 29aR) in the first brake rod (29L, 29R) in the invention according to claim 1. A turnbuckle-shaped second length adjusting means (36aL, 36aR) is configured on the second brake rod (36L, 36R).
First invention relating to the present invention, the left and right brake mechanism 17L for braking the rear wheel, comprising a 17R, the brake mechanism 17L, brake arm 22L interlocked to 17R, the 22R, the is operated by the brake pedal 23 1 In a work vehicle connecting the second brake rods 36L and 36R operated by the brake rods 29L and 29R and the parking lever 31, a pedal interlocking shaft 26 that rotates by depressing the brake pedal 23 is provided. The first brake rods 29L and 29R are connected to 26, a lever interlocking shaft 32 that rotates by operating the parking lever 31 is provided, and the second brake rods 36L and 36R are connected to the lever interlocking shaft 32. The first brake rods 29L and 29R and the second brake rods 36L and 36R are arranged substantially in parallel.

Second invention relating to the present invention, in the first invention relating to the present invention, attaching a first support cylinder 25 for supporting the pedal interlocking shaft 26 to the transmission case 5 lower surface, the supporting lever interlocking shaft 32 2 The support cylinder 30 is arranged behind the first support cylinder 25, the brake pedal 23 is connected to the pedal interlocking shaft 26, the left and right pedal arms 28L and 28R are provided, and the parking interlocking arm 33 is connected to the lever interlocking shaft 32. The left and right lever arms 35L and 35R are provided, the left and right pedal arms 28L and 28R and the left and right brake arms 22L and 22R are connected by the first left and right brake rods 29L and 29R, and the left and right lever arms 35L and 35R and the left and right brake arms 22L, The 22R is connected by the second left and right brake rods 36L and 36R.

Third invention related to the present invention is the second invention relating to the present invention, the first supporting cylinder 25 bracket 25a, is connected to the lower surface of the transmission case 5 via a 25a, second support cylinder 30 Was connected and held to the first support cylinder 25 by holding plates 25b and 25b.

A fourth invention relating to the present invention, in any one of the first relevant to the present invention the third invention, the first brake rod 29L, the first length adjusting means Daan buckle forms in 29R 29aL and 29aR are configured, and the second brake rods 36L and 36R are configured with turnbuckle-shaped second length adjusting means 36aL and 36aR.

According to the present invention, each brake rod is made single, and the installation space of the interlocking mechanism is not required as in the case where the interlocking mechanism of the parking lever is linked to the existing brake rod.
According to the present invention relating to the present invention, the first brake rod 29L, the a 29R second brake rods 36L, since those with 36R are disposed substantially parallel to the side surface of the transmission case 5 When placed, the installation space can be reduced. That is, when the brake rods are made single as in the conventional case and the interlocking mechanism of the parking lever is interlocked with the existing brake rod, the installation space of the interlocking mechanism is required, but the first and second brake rods are used. When arranged in parallel, such an installation space is not required.

According to the second invention related to the present invention, in addition to the effect of the first invention related to the present invention, the first support cylinder 25 for supporting the pedal interlocking shaft 26 is attached to the lower surface of the mission case 5, and the lever is interlocked. Since the second support cylinder 30 that supports the shaft 32 is arranged behind the first support cylinder 25, it is not necessary to penetrate the mission case 5, and the configuration is simplified.

According to a third invention relating to the present invention, in addition to the effects of the second invention relating to the present invention, the second support cylinder 30 is constructed and is connected to a first support cylinder 25, to the transmission case 5 bottom surface Since the mounting configuration is the same, the configuration is simplified without requiring a special additional configuration for mounting the lower surface of the mission case 5.

According to a fourth invention relating to the present invention, in addition to the effect from the first relating to the present invention a third any one invention of the first length adjusting means 29aL, 29aR and the second length adjusting means 36aL , 36aR can be arranged at a position close to each other, and the adjustment work can be performed at a predetermined fixed position, which makes the work more efficient.

It is a side view of an agricultural tractor. It is a top view of an agricultural tractor. It is a side view which shows the mission case and the peripheral structure. It is a bottom view which shows the left-right brake interlocking mechanism. It is a rear view of the 1st support cylinder. (A) is a front view showing an interlocking mechanism by a brake pedal, and (B) is a rear view showing an interlocking mechanism by a parking lever. It is a side view of the brake switch part and its surroundings. It is a side view of a parking switch part and its surroundings.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings.

Agricultural tractors as work vehicles work in fields or the like while self-propelled by power. Agricultural tractors include left and right front wheels 2L and 2R that are on the front side of the fuselage 1 and can be driven and steered, left and right rear wheels 3L and 3R mounted on the rear side of the fuselage 1, and an engine 4 as a power source. A transmission case 5 in which a transmission is installed is provided. In the pair of left and right members, the reference numeral L in the figure indicates the left side, and the sign R indicates the right side.

Further, a connecting device 7 to which a working machine 6 such as a rotary can be mounted is arranged at the rear part of the machine body 1. The connecting device 7 is a three-point link composed of a top link 7a in the upper center and lower links 7b and 7b in the lower left and right, and by rotating the lift arm 8 hydraulically, the lower links are via the lift rods 9 and 9. It is configured to rotate 7b and move the working machine 6 up and down.

In the tractor 1, the steering handle 13 is erected from the dashboard 12 on the front side of the driver's seat 10 on the machine body, and various operation pedals such as a clutch pedal, a brake pedal, an accelerator pedal, and a forward / backward lever are provided around the driver's seat 10. , Various operation levers such as a speed change lever are arranged.

A transmission mechanism is arranged in the mission case 5. Regarding the transmission mechanism, the power from the engine 4 is transmitted to the rear wheel differential mechanism 15 via the known forward / backward switching mechanism, main transmission mechanism, and auxiliary transmission mechanism, and is transmitted to the left and right ends of the left and right differential output shafts 16L and 16R. It is equipped with brake mechanisms 17L and 17R. A final reduction mechanism (not shown) is formed by combining spur gears between the left and right differential output shafts 16L and 16R and the rear axles 18L and 18R that support the left and right rear wheels 3L and 3R.

The configuration and interlocking configuration of the left and right brake mechanisms 17L and 17R will be described. Since the left and right brake mechanisms 17L and 17R have a common configuration, the reference numeral L meaning the left side and the reference numeral R meaning the right side will be omitted as appropriate. The brake mechanism 17 has a known configuration including a brake disc fitted to the differential output shaft 16 and slidable in the axial direction, a pair of brake cam discs, a cam mechanism composed of a rotating cam plate and a ball, and the like. Then, the differential output shaft 16 can be braked by pressing the brake disc against the fixed wall portion in a state of being expanded by the cam mechanism.

Axle cases 20L and 20R that support and cover the differential output shaft 16 and the rear axle 18 are connected to the mission case 5. In the left and right axle cases 20L and 20R, brake operating shafts 21L and 21R interlocking with a cam mechanism are rotatably provided around the horizontal axis core in each of the brake mechanisms 17L and 17R, and brake arms are provided at their outer ends. 22L and 22R are connected.

The brake pedal 23 that operates the brake mechanisms 17L and 17R is rotatably provided around the horizontal axis. Specifically, below step 24 of the cockpit 10, first support cylinders 25 are provided on the lower surface of the mission case 5 at two locations in the longitudinal direction of the first support cylinders 25 via flat plate brackets 25a and 25a. Installing. A pedal interlocking shaft 26 is provided so as to penetrate the first support cylinder 25. The base side boss 23a of the brake pedal 23 penetrates through the right protruding portion of the pedal interlocking shaft 26, and the brake pedal 23, the base side boss 23a and the pedal interlocking shaft 26 integrally have the pedal interlocking shaft 26 axis center with the connecting pin 27. It is configured so that it can rotate around.

A left pedal arm 28L is provided at the left protruding end of the pedal interlocking shaft 26, and a right pedal arm 28R is provided at the end of the base side boss 23a of the brake pedal 23. The left pedal arm 28L and the left brake arm 22L are connected by the first left brake rod 29L, and the right pedal arm 28R and the right brake arm 22R are connected by the first right brake rod 29R. The first left and right brake rods 29L and 29R are provided in an inclined posture on each of the left and right sides of the mission case 5 (FIG. 3).

A second support cylinder 30 is provided behind the first support cylinder 25 in parallel with the first support cylinder 25. Specifically, the brackets 25a and 25a of the first support cylinder 25 are fitted into the holding plates 25b and 25b which are welded and fixed to the brackets 25a and 25a while being fitted to the outer peripheral portion of the first support cylinder 25 to be reinforced. It is configured to be welded and fixed in the combined state.

The second support cylinder 30 constitutes a relay interlocking mechanism that transmits the operating force of the parking lever 31 to the left and right brake arms 22L and 22R, and is provided in the second support cylinder 30 so as to penetrate the lever interlocking shaft 32. The boss 33a of the parking interlocking arm 33 penetrates through the left protruding portion of the lever interlocking shaft 32, and the parking interlocking arm 33, the boss 33a and the lever interlocking shaft 32 integrally have the lever interlocking shaft 32 axis center with the connecting pin 34. It is configured so that it can rotate around.

The right lever arm 35R is provided at the right protruding end of the lever interlocking shaft 32, and the left lever arm 35L is provided at the end of the boss 33a of the parking interlocking arm 33. Then, the left lever arm 35L and the left brake arm 22L are connected by the second left brake rod 36L, and the right lever arm 35R and the right brake arm 22R are connected by the second right brake rod 36R.

The connection point C1 between the first left and right brake rods 29L and 29R and the left and right brake arms 22L and 22R is compared with the connection point C2 between the second left and right brake rods 36L and 36R and the left and right brake arms 22L and 22R. Is set at a position close to the brake operating shafts 21L and 21R, and the first brake rod 29 and the second brake rod 36 are arranged in a substantially parallel state.

When the parking interlocking arm 33 is arranged in the front-rear direction and the lower end of the parking interlocking rod 37 whose upper end is connected to the parking lever 31 is connected to the rear end thereof, the parking lever 31 is rotated upward around the support shaft 31a. , The second left and right brake rods 36L and 36R are simultaneously operated on the braking side. The parking interlocking rod 37 is in a posture of facing substantially up and down. The parking lever 31 is provided on the left side of the driver's seat 10, and the parking interlocking rod 35 is arranged on the left side of the mission case 5.

As described above, the first left and right brake rods 29L and 29R for transmitting the operating force by the brake pedal 23 and the second left and right brake rods 36L and 36R for transmitting the operating force by the parking lever 31 are both brake arms 22L and 22R. Since the structure is connected to the brake pedal 23, the left and right brake mechanisms 17L and 17R can be operated on the braking side by two systems of the brake pedal 23 and the parking lever 31. Since the first left and right brake rods 29L and 29R and the second left and right brake rods 36L and 36R are arranged substantially in parallel, the two brakes are arranged when they are arranged on the side surface of the mission case 5. Since the rods 29 and 36 are arranged in parallel, their installation space can be set small. That is, when the left and right brake rods are made single as in the conventional case and the interlocking mechanism of the parking lever is interlocked with the existing brake rod, the installation space of the interlocking mechanism is required, but as in the above embodiment, the left and right brake rods are required. When two brake rods are arranged in parallel, such an installation space is not required.

The first support cylinder 25 that supports the pedal interlocking shaft 26 for transmitting the brake operation by the brake pedal 23 to the first left and right brake rods 29L and 29R is mounted on the lower surface of the transmission case 5, and the brake operation by the parking lever 31. The second support cylinder 30 that supports the lever interlocking shaft 32 for transmitting the above to the second left and right brake rods 36L and 36R is arranged in parallel with the first support cylinder 25, so that the configuration can be simplified. , The cooperation means by the parking lever 1 can be easily retrofitted.

Since the second support cylinder 30 is configured to be connected to the first support cylinder 25 and has a common mounting configuration on the lower surface of the mission case 5, a special additional configuration for mounting the lower surface of the mission case 5 is provided. Simplify the configuration without the need.

The first brake rods 29L and 29R are configured with turnbuckle-shaped first length adjusting means 29aL and 29aR, respectively. Further, the second brake rods 36L and 36R also form the second length adjusting means 36aL and 36aR in the form of turnbuckles, respectively, but the first length adjusting means 29aL and 29aR and the second length adjusting means 36aL and 36aR Is arranged at a position close to the above, and the adjustment work can be performed at a predetermined fixed position, which makes the adjustment work more efficient.

A brake switch 40 is provided in the vicinity of the base side boss 23a of the brake pedal 23, and a sliding arm 40c is provided so that the switch contact plate 40a protrudes from the switch body 40b in order to interlock with the rotation of the base side boss 23a. When the brake pedal 23 is depressed, the contact plate 40a gradually disengages from the tip of the sliding arm 40c, the brake switch 40 outputs clutch disengagement information, and when the brake pedal 23 is released, the contact plate is restored by the restoring force of the spring 41. The 40a presses the tip of the sliding arm 40c to switch the switch, and the clutch engagement information can be output.

Further, the parking switch 42 is arranged in the vicinity of the parking lever 31. A bracket 43 appropriately fixed to the mission case 5 side is provided between the parking lever 31 and the side wall of the mission case 5, and the main body 42a of the parking switch 42 is attached to the bracket 43. The actuator 42b is provided so as to be rotatable up and down around the axis, and the actuator 42b rotates upward by contact with the operation pin 37a provided on the parking interlocking rod 37 to output parking brake operation information. The bracket 43 is provided with a fixed position adjusting means 44 by an elongated hole so that the position can be adjusted to the approaching side or the separating side within the moving range of the parking interlocking rod 37. By bending the tip end side of the bracket 43, it serves as a protective cover for protecting the main body portion 42a.

In this embodiment, the configuration of a single brake lever has been described, but the left and right independent brake pedals used for agricultural tractors may be used. When the left brake pedal is operated independently, the left pedal arm 28L is interlocked via the pedal interlocking shaft 26, and when the right brake pedal is operated, the right pedal arm 28R connected to the boss portion of the right brake pedal is interlocked. Is what you do.

5 Mission case 17L Left brake mechanism 17R Right brake mechanism 22L Left brake arm 22R Right brake arm 23 Brake pedal 25 First support cylinder 25a Bracket 25b Holding plate 26 Pedal interlocking shaft 28L Left pedal arm 28R Right pedal arm 29L First left brake Rod 29R 1st right brake rod 29aL 1st length adjusting means 29aR 1st length adjusting means 30 2nd support cylinder 31 Parking lever 32 Lever interlocking shaft 35L Left lever arm 35R Right lever arm 36L 2nd left brake rod 36R Second right brake rod 36aL Second length adjusting means 36aR Second length adjusting means

Claims (2)

A first brake operated by a brake pedal (23) on a brake arm (22L, 22R) provided with left and right brake mechanisms (17L, 17R) for braking the rear wheels and interlocking with the brake mechanism (17L, 17R). In a work vehicle connecting a second brake rod (36L, 36R) operated by a rod (29L, 29R) and a parking lever (31).
A pedal interlocking shaft (26) that rotates by depressing the brake pedal (23) is provided, the first brake rods (29L, 29R) are connected to the pedal interlocking shaft (26), and the parking lever (31). ) Is provided, and the second brake rod (36L, 36R) is connected to the lever interlocking shaft (32), and the first brake rod (29L, 29R) is connected to the lever interlocking shaft (32). And the second brake rod (36L, 36R) are arranged substantially in parallel .
The first support cylinder (25) that supports the pedal interlocking shaft (26) is attached to the lower surface of the mission case (5), and the second support cylinder (30) that supports the lever interlocking shaft (32) is attached to the first support cylinder. Arranged behind (25), the brake pedal (23) is connected to the pedal interlocking shaft (26), left and right pedal arms (28L, 28R) are provided, and the parking interlocking arm (32) is connected to the lever interlocking shaft (32). 33) is connected and left and right lever arms (35L, 35R) are provided, and the left and right pedal arms (28L, 28R) and the left and right brake arms (22L, 22R) are connected by the first left and right brake rods (29L, 29R). Then, the left and right lever arms (35L, 35R) and the left and right brake arms (22L, 22R) are connected by the second left and right brake rods (36L, 36R).
The first support cylinder (25) is connected to the lower surface of the mission case (5) via brackets (25a, 25a), and the second support cylinder (30) is attached to the first support cylinder (25). A work vehicle characterized in that it is connected and held by holding plates (25b, 25b) . The first brake rod (29L, 29R) constitutes a first length adjusting means data Nbakkuru form the (29aL, 29aR), the second brake rods (36L, 36R) a second turnbuckle form The work vehicle according to claim 1 , which constitutes the length adjusting means (36aL, 36aR).

Images