JPH09240289A - Engine supporting structure for working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To firmly support an engine without any increase in the longitudinal length of a machine body. SOLUTION: A steering gear case 22 is connected to the upper face of a transmission case 23 with its front end extended forward from the front end of the transmission case 23, while an engine 4 is installed in the front part of the steering gear case 22, so that the transmission case 23, the steering gear case 22, and the engine 4 can be integrally connected together while an arrangement space for a steering post 5A is secured in the rear position of the engine 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine support structure for a work vehicle, and more particularly, to an improvement of a work vehicle in which an engine, a mission case, and a steering wheel are arranged in the front part of a body such as a passenger rice transplanter. Regarding

[0002]

2. Description of the Related Art As an example of a work vehicle constructed as described above, a passenger type rice transplanter is described in Japanese Utility Model Laid-Open No. 58-156014.
There is one disclosed in Japanese Utility Model Publication No. 5-7522, and as shown in these conventional examples, the engine is mounted and supported on a frame connected to the front of the mission case in a protruding state. It had been.

[0003]

However, in the case where the engine is mounted on the frame extending in the forward direction from the engine as in the conventional example, since the engine projects to the front side of the machine body, the size of the machine body in the front-rear direction is increased. Will be
There is also room for improvement in terms of strength, such as the fact that the mission case and the frame are firmly connected to each other to firmly support the engine, and a large frame must be used.

An object of the present invention is to obtain an engine support structure for a work vehicle that is a strong support system while reducing the size of the machine body in the front-rear direction with a reasonable improvement.

[0005]

The first feature of the present invention resides in that the engine, the steering gear case, and the transmission case are vertically connected and integrated, and the operation thereof is as follows.

A second feature of the present invention is that the front end of the steering gear case extends forward of the front end of the mission case, and the engine is located in front of the steering gear case forward of the mission case. The steering post is mounted on the steering gear case, and a steering post is provided upright on the rear portion of the steering gear case. The operation is as follows.

A third feature of the present invention resides in that the engine is supported on the upper surface of the steering gear case through an elastic body for vibration isolation, and its operation is as follows.

[Operation] According to the first feature, since the engine, the steering gear case, and the transmission case are integrated in the vertical direction, the engine is mounted on the frame extending in the forward direction as in the conventional example. In comparison, not only does the frame not be required, but the engine can be arranged on the rear side, and the weight of the engine can be received and supported by the steering case and the transmission case as one body. In particular, the connected product of the steering gear case and the transmission case has high strength because a plurality of layers of wall portions are formed as compared with a case of the same volume, and thus exhibits high support strength.

According to the second feature, by extending the front end of the steering gear case forward, a space for disposing the engine and the steering post is secured on the upper surface of the steering gear case without increasing the size of the transmission case. At the same time, the weight of the engine can be received by the steering gear case and can be supported by the steering gear case and the transmission case.

According to the third feature, although the engine is supported by the integral body of the steering gear case and the transmission case, the vibration of the engine is damped by the elastic body, and the vibration of the engine to the steering operation system and the entire machine body is attenuated. The propagation of can be reduced.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a driver's seat 3 is arranged at the center of a traveling machine body having a steering type driven front wheel 1 and a driving type rear wheel 2, and the traveling machine body of this traveling machine body is arranged. A transmission system for transmitting power from the engine 4 arranged in the front portion to the front and rear wheels 1, 2 and an operation system for transmitting operating force from the steering wheel 5 in front of the driver's seat to the front wheels 1 are formed, and the traveling machine body The seedling planting apparatus A is connected to the rear end portion of the plant through a link mechanism 7 that is driven up and down by a hydraulic cylinder 6 to form a riding type rice transplanter as a work vehicle.

The seedling planting apparatus A is constructed so that the mat-like seedlings W placed on the seedling placing table 8 are planted one by one in the field scene by the rotary type planting mechanism 9. Is equipped with a plurality of ground leveling floats 10 and is configured for four-row planting.

As shown in FIGS. 2 and 4, the engine 4
A hood 12 is arranged around the fuel tank 13, a fuel tank 13 is arranged at an upper position of the engine 4, and a panel portion 14 is arranged adjacent to a rear portion of the fuel tank 13. The steering handle 5 is arranged above the panel portion 14, the main shift lever 15 is arranged at the left side position of the panel portion 14, the auxiliary shift lever 16 is arranged at the right side position of the panel portion 14, and the hood 12 The main clutch pedal 17 is arranged on the step surface at the left side position, and the pair of left and right side brake pedals 18, 18 capable of independently braking the left and right rear wheels 2, 2 are arranged at the right side position of the hood 12, and As shown in FIG. 1, an elevating lever 19 for controlling the raising and lowering of the seedling planting device A and turning on and off the planting clutch C (see FIG. 7) at the right side of the driver's seat 3, and raising and lowering of the seedling planting device A. A control sensitivity setting lever 20 for setting the control sensitivity is arranged.

Further, in this rice transplanter, the engine 4, the steering gear case 22, and the mission case 23 are integrally connected in a vertically stacked state to support the engine 4 with high strength and to the front of the front of the machine body. The amount of protrusion of is reduced.

That is, as shown in FIGS. 2 and 3, the mission case 23 is connected and fixed to the machine frame 24, and the steering gear case 22 is bolted to the flat surface of the upper surface of the mission case 23 in a mounted state. is there.
The steering gear case 22 has a post support portion 22A integrally formed in the rear portion thereof, and has a pinion gear 25 inside.
And a first reduction gear 26 and a second reduction gear 27,
A gear shaft 28 of the reduction gear 27 is arranged so as to penetrate the transmission case 23 from above to below, and a pitman arm 29 is provided at the lower end of the gear shaft 28. In addition, the front end of the steering gear case 22 is attached to the mission case 2
A mounting portion of the engine 4 is formed by projecting further forward than the front end of the engine 3, and the engine 4 is mounted on the mounting portion via a vibration-proof rubber 30 as an elastic body for vibration damping. It is mounted and supported.

Further, the steering post 5A of the steering handle 5 is connected and fixed to the post support portion 22A formed at the rear portion of the steering gear case 23, and the steering operation shaft 5S and the gear shaft 25 of the pinion gear 25.
S is interlockingly connected, and as shown in FIG. 5, the pitman arm 29 and the knuckle arms 32, 32 at the outer end of the front axle case 31 are connected by tie rods 33, 33 to operate the steering wheel 5. Is transmitted to the left and right front wheels 1 and 1 in a decelerated state by the steering gear case 22 so that the steering operation can be performed. Further, as shown in FIGS. 2 and 4, an air cleaner 35 is provided on the right side of the engine 4.
, The muffler 36 is arranged on the left side of the engine 4, and the starter motor 37 is arranged on the front part of the engine 4. Further, the battery 38 is supported on the machine body frame 24 at the front position of the engine 4, and headlights 39, 39 are provided at the respective positions of the openings formed in the machine body frame 24.

As shown in FIG. 2, the output shaft 41 of the engine 4 in the horizontal orientation is provided with an output pulley 42 having a large diameter belt winding portion and a small diameter belt winding portion, and the transmission case 23 in the horizontal orientation is provided. The input shaft 43 is provided with an input pulley 44 having a large diameter belt winding portion and a small diameter belt winding portion, and the endless belts 45, 45 are wound around the belt winding portions of the respective pulleys 42, 44, and , The respective endless belts 45, 45
Of tension pulleys 46, 46 for applying tension to the
And a belt transmission mechanism from the engine 4 to the transmission case 23 is formed. As shown in FIGS. 8 to 11, the two tension pulleys 46, 46 are tension arms 48, 4 which are rotatable about a support shaft 47 in a horizontal posture.
The tension arm 4 is supported by the swing end of
Tension springs 49, 49 for applying an urging force to the tension acting side are engaged with the end portions of the non-tension pulley side of 8, 48. With this configuration, the pair of endless belts 4
A transmission state in which power from the engine 4 is transmitted to the mission case 23 at high speed by selecting either one of 5, 5 and 45 and applying tension from the tension pulley 46,
The belt transmission mechanism is configured so that it can be switched to a transmission state in which it is transmitted at a low speed.

Further, a laterally-oriented cylindrical shaft 51 that interlocks with a laterally-oriented base end portion of the auxiliary transmission lever 16 via a linkage mechanism 50 is provided, and the pair of arm portions 5 of the tubular shaft 51 are provided.
2, 52 are connected to the arcuate links 53, 53 so as to be swingable about the axis of the lateral posture, and the arcuate links 53, the rod 54, and the tension arm are linked to each other via the link piece 55. The transmission speed of the belt transmission mechanism can be switched by operating the auxiliary transmission lever 16 in the front-rear direction. In this transmission system, the auxiliary transmission lever 16 is operated at a high speed position to be in a high speed transmission state, and is operated at a low speed position to show a low speed transmission state.

Further, a linking member 57 linked to the pins 56, 56 at the base end portions of the respective tension arms 48, 48 via elongated holes 57A, 57A, and the base end portion of the main clutch pedal 17 are integrated. A rod 59 is provided between the swinging arm 58 and the tension pulleys 46, 46 against the biasing force of the tension springs 49, 49 so that the tension pulleys 46, 46 are not forced to operate when the main clutch pedal 17 is depressed. A main clutch mechanism that is operated to the side to shut off the power transmitted from the engine 4 to the mission case 23 is configured.

As shown in FIG. 3, FIG. 6, and FIG. 7, the first shaft 61, the second shaft 62, and the third shaft 63 are installed inside the mission case 23 in an axial posture parallel to the input shaft 43. The first transmission shaft 61 is arranged to form a speed change system for traveling, and the fourth shaft 64 for transmission with a plant is formed on the end side of the first shaft 61 in a free-wheeling state coaxially with the first shaft 61. Further, the fifth shaft 65 is arranged in an axial center posture parallel to the fourth shaft 64. First shaft 61
There are a high-speed position in which the high-speed gear 66 of the input shaft 43 is engaged, and a low-speed position in which the high-speed gear 66 is separated from the high-speed gear 66 and engaged and connected to the side surface of the free-wheel gear 68 that is idle-supported on the first shaft 61. And a freewheel gear 68 and a reverse rotation gear 70 that mesh with the low speed gear 67 of the input shaft 43.
And a forward shifting gear 71. The switching gear 69
An engaging projection 69A is formed on the side surface of the, and a recess 68A that engages with the engaging projection 69A is formed on the side surface of the idle gear 68.

The second shaft 62 is provided with an idle gear 73 integrally formed with an input gear 73A and an output gear 73A that mesh with one of the reverse gears of the first shaft 61 so as to rotate integrally with the second shaft 62. ing. The large diameter gear 7 is attached to the third shaft 63.
4A is an output gear 73B of the idle gear 73 of the second shaft 62.
And the large-diameter gear 74B is engaged with the first shaft 6
1st forward speed position (F
1) and the forward gear 2 (F2) in which the small-diameter gear 74B meshes with the idle gear 68 of the first shaft 61, and the shift gear 74 is shiftably provided via a spline structure.
A drive gear 75 for the differential device D for the front wheels 1, 1 is integrally formed at the end of the third shaft 63. The reverse position (R) and the forward first speed position (F
A neutral position (N) that does not engage with any gear is formed at an intermediate position between 1) and the second forward speed position F2.

The differential device D comprises a ring gear 76 which meshes with the drive gear 75 of the third shaft 63, a differential pinion gear 78 which is rotatably supported by a differential case 77, and a differential side gear 79. Differential side gear 7
A transmission system for transmitting the power from 9, 79 to the axles 80 for the left and right front wheels 1, 1 is formed, and one axle 80 is engaged with the differential case 77 to stop the function of the differential device. A diff lock sleeve 81 (an operation system is not described in detail) for forcibly driving the vehicle axle at a constant speed is slidably operated through a spline fitting structure. In addition, the output shaft 83 in a front-back direction is driven by a pinion gear 82 that meshes with the ring gear 76 of the differential device D so as to drive the rear wheels 2, 2 in synchronization with the front wheels 1, 1.
3, the power from the output shaft 83 is transmitted to the rear axle case 85 via the intermediate shaft 84.

As shown in FIG. 7, the gear 87 connected to the right end portion of the second shaft 62 and the gear 88 connected to the right end portion of the fourth shaft 64 are engaged with each other and the traveling speed is increased via the second shaft 62. A transmission system for transmitting the synchronized rotation speed to the fourth shaft 64 is formed, and three gear parts 89 integrally formed on the fourth shaft 64,
89, 89 is provided with a variable transmission gear 90 that can be engaged with the fifth shaft 65 slidably via a spline fitting structure, and a bevel gear 91 is provided in an intermediate portion of the fourth shaft 64. Prepared for integral rotation.

A sixth shaft 93 having a bevel gear 92 that meshes with the bevel gear 91 of the fourth shaft 64, which is in a front-rear direction, and a seventh shaft 94, which is in parallel with the sixth shaft 93, are provided. Is equipped with a jump clutch 95 and a drive gear 96 driven by the power from the jump clutch 95, and the drive gear 9 of the sixth shaft 93 with respect to the seventh shaft 94.
6 is engaged with the driven gear 97 by idling, and the claw-shaped portion formed on the driven gear 97 is disengaged, so that the seventh shaft 9
4, a clutch sleeve 98 is slidably mounted on the seventh shaft 94 so as to be switchable between a transmission position for transmitting the power from the drive gear 96 to the seventh shaft 94 and a non-transmission position for not transmitting the power, to the planted clutch C. Configured. In addition, this 7th shaft 94
Is formed so that its rear end is exposed to the outside from the rear end of the mission case 23, and a transmission system for transmitting power from the rear end to the seedling planting apparatus A is formed.

As shown in FIG. 8, a switching shaft 10 having a shift fork (not shown) for operating the switching gear 69.
A switching lever 102 for projecting the end portion of No. 1 to the right side surface of the mission case 23 and operating the switching shaft 101 in the axial direction by connecting to this end is provided on the right side surface of the mission case 23 in a front-back posture. Prepare to swing around 103,
The operation-side end of the switching lever 102 is exposed through the opening at the lower portion of the rear surface of the hood. By setting the switching lever 102 to the high speed position H, a high speed transmission state is revealed and the low speed position L is set. By setting it, the low speed transmission state is revealed.

Further, the end of the speed change shaft 105 having a shift fork (not shown) for operating the speed change gear 74 is projected to the left side surface of the mission case 23, and is swayed around the support shaft 106 in the front-back posture. One end of the movable crank member 107 is connected to the end of the speed change shaft 105, and the other end of the crank member 107 and the base end of the main speed change lever 15 are connected. The push-pull rod 1 is provided between the arm 108 and the arm 108 which is rocked around the axis in a horizontal posture.
09, and the main transmission lever 15 is set to the rearward reverse position (R), the first forward speed (F1), the forward two
By setting the operating positions of the respective speed (F2) positions, the transmission gear 74 is set to the backward position (R), the first forward speed (F1), and the second forward speed (F2) position to establish the linkage relationship. Has been done.

In addition, an end of an inter-stock transmission shaft 111 having a shift fork (not shown) for operating the inter-stock transmission gear 90 is projected to the right side surface of the transmission case 23, and a projecting end of the inter-stock transmission shaft 111 is also provided. The operation knob 111A is formed on the above, and the number of planting seedlings per unit traveling distance of the machine can be changed by directly manipulating the operation knob 111A. The operation knob 111A is located below the step on the front of the machine body.

As shown in FIG. 3, an operating lever 113 for operating the clutch sleeve 98 of the planting clutch C to open and close the planting clutch C is formed at the rear portion of the mission case 23. Is linked to the lifting lever 19 (linkage is not described in detail).

Since the engine 4, the steering gear case 22 and the mission case 23 are vertically integrated as described above, the weight of the engine 4 is received and supported by the integral body of the steering gear case 22 and the mission case 23. 4 does not require a frame for mounting the engine 4, and the engine 4 can be arranged closer to the rear side. Further, by extending the front end of the steering gear case 22 forward, the size of the mission case 23 is increased. Without fail, a space for disposing the engine 4 and the steering post 5A is secured on the upper surface of the steering gear case 22, the weight of the engine 4 is received by the steering gear case 22, and the engine 4 is integrated with the steering gear case 22 and the mission case 23. Engine 4 while supporting Vibration damping rubbers 30 attenuates the by steering system, which is assumed to be smaller propagation of engine vibrations to the whole body.

When the machine body is moved backward, the main transmission lever 15 is set to the reverse position (R), and when the machine body is moved forward during work, the main transmission lever 15 is moved to the first forward speed position (F).
1) and when moving the vehicle forward at a relatively high speed such as traveling on the road, set the main shift lever 15 to the forward second speed position (F2).
Is set to obtain an appropriate traveling speed, and when the speed is changed in such a state, the auxiliary transmission lever 16 is set to the high speed position, or
The sub-transmission lever 16 is set to the low speed position.
Note that the switching lever 102 has a function of displaying a high-speed traveling state or a low-speed traveling state by presetting to a high-speed position or a low-speed position like the auxiliary shift lever 16. .

[Other Embodiments] In addition to the above-described embodiments, the present invention configures a mission case by setting the dimension in the front-rear direction such that the front end of the steering gear case is in a position substantially equal to the mission case in a side view. It is also possible to directly connect and support the engine to the upper surface of the steering gear case without interposing vibration damping rubber.

[0033]

As described above, the ratio of the engine, the steering gear case, and the transmission case can be reasonably arranged to reduce the size of the machine body in the front-rear direction while providing a strong support system for the working vehicle. Claim 1). or,
The engine can be supported while securing the space for disposing the steering post (Claim 2), and the influence of vibration from the engine can be reduced to enable work in a quiet state (Claim 3).

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the attached drawings.

[Brief description of drawings]

[Figure 1] Overall side view of rice transplanter

[Fig. 2] Vertical side view of the entire aircraft

FIG. 3 is a vertical sectional side view of an engine support system.

FIG. 4 is a plan view of the front of the machine body.

FIG. 5 is a plan view of a steering operation system.

FIG. 6 is a cross-sectional plan view of the middle part of the mission case.

FIG. 7 is a cross-sectional plan view of the upper part of the mission case.

FIG. 8 is a rear view of the shift operation system.

FIG. 9 is a side view of the auxiliary shift operation system in a low speed state.

FIG. 10 is a side view of the auxiliary shift operation system in a high speed state.

FIG. 11 is a side view of the auxiliary shift operation system when the main clutch lever is depressed.

[Explanation of symbols]

 4 engine 5A steering post 22 steering gear case 23 mission case 30 elastic body

Claims (3)

[Claims] 1. An engine support structure for a work vehicle in which an engine (4), a steering gear case (22), and a transmission case (23) are vertically integrated and integrated. 2. The front end of the steering gear case (22) extends forward of the front end of the transmission case (23), and the steering gear case (2)
The engine (4) is mounted on the front part of 2) so as to be positioned in front of the mission case (23), and the steering post (5A) is provided upright on the rear part of the steering gear case (22). An engine support structure for a work vehicle according to claim 1. 3. The engine support structure for a work vehicle according to claim 1, wherein the engine (4) is supported on the upper surface of the steering gear case (22) via an elastic body (30) for vibration isolation.