JP2000343957A - Engine supporting structure for cultivating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mission case serving as an engine supporting base for a cultivating machine with excellent cooling effect, by forming the engine supporting base integrally with the mission case and reducing a contact area between the engine and the mission case. SOLUTION: Mounting faces 2a for mounting fixedly an engine 11 are integrally formed on an upper face of a mission case 2 in a cultivating machine, the engine 11 is directly fixed on the mounting faces 2a, the mounting faces 2a, 2a are provided separatedly in rear and front sides of the mission case 2 to have a space 2b between the rear and front mounting faces 2a, 2a, the space 2b is provided thereby between the engine 11 and the mission case 2, and the space 2b is arranged just under an oil pan 11a of the engine 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support structure for an engine in a cultivator. More specifically, the present invention relates to a technology of a transmission case that also serves as an engine support for a cultivator in which a cooling effect is enhanced by reducing a contact area between an engine and a transmission case.

[0002]

2. Description of the Related Art In the prior art, an engine in a cultivator is provided with an engine support fixed to the front of a transmission case, an engine fixed to an upper portion of the engine support, and an output shaft of the engine and a transmission case. A belt transmission mechanism or a chain transmission mechanism is provided between the input shafts of the first and second input shafts to input the power from the engine to the transmission case.

[0003]

However, in the prior art described above, since the engine in the cultivator and the transmission case are interposed between the engine and the transmission case, the output shaft of the engine and the input of the transmission case are used. There is a problem that an error easily occurs in a positional relationship between the shaft and an assembly dimension. Further, forming the engine support base increases the number of parts and the number of assembly steps, and also increases the production cost. SUMMARY OF THE INVENTION In view of the above, the present invention provides a transmission case that also has an excellent cooling effect by integrating an engine support with a transmission case and reducing the contact area between the engine and the transmission case.

[0004]

The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described. That is, in the cultivator, a mounting surface for mounting and fixing the engine is integrally formed on the upper surface of the transmission case, and the engine is directly fixed on the mounting surface. Further, the mounting surface is divided into front and rear portions of the transmission case, a space is provided between the front and rear mounting surfaces, a space is provided between the engine and the transmission case, and the space is substantially equivalent to an oil pan of the engine. It is arranged directly below.

[0005]

Next, embodiments of the present invention will be described. First, an overall configuration of a cultivator according to an embodiment of the present invention will be described. FIG. 1 is a side view showing an overall configuration of a cultivator according to one embodiment of the present invention, and FIG. 2 is a plan view of the same.

That is, as shown in FIGS. 1 and 2, in this cultivator, a pair of left and right running wheels 1.1 are mounted on a transmission case 2 via axles 3.3 and a handle stand is provided at the rear of the transmission case 2. The lower part 4 is fixed, and a steering handle 5 having a loop shape in plan view is connected to the upper part of the handle base 4, so that the steering handle 5 is positioned obliquely rearward and above the transmission case 2.

A main shift lever 6, a clutch lever 7, a differential lock lever 8, an accelerator lever 10 for changing the number of revolutions of the engine, and the like are mounted on an operating portion 9 near the steering handle 5. The main transmission lever 6 is a PTO,
The clutch is also used for connecting / disconnecting operation. The forward / backward movement and speed of the cultivator are changed by tilting the lever back and forth, and the PTO clutch is connected / disconnected by tilting left and right.

Further, as shown in FIG. 1, an engine 11 is mounted and fixed on a substantially horizontal surface 2a on the upper surface of the transmission case 2, and the output of the engine 11 is continuously variable. HST ”) 12 for Mission Case 2
An output shaft 17 of the engine 11 is provided on one of the left and right side surfaces of the rear portion.
And an input shaft 18 of the HST 12 are connected by an output pulley 15, an input pulley 16, and a belt 14. A fuel tank 34 is provided above the engine 11.

A belt tension clutch 13 for connecting and disconnecting the power transmission between the two shafts 17 and 18 is provided. The tension clutch 13 is connected to a clutch lever 7 of the operating section 9 via a link mechanism, a wire, and the like (not shown). And the clutch lever 7 controls the tension clutch 13
Connection is operated. In addition, a brake that performs braking in conjunction with switching of the tension clutch 13 to “disengage” is an HST
Twelve input shafts 18 are provided to brake the rotation due to the inertial force immediately after the clutch "disengage" operation, so that the drive is stopped quickly.

The transmission case 2 is formed in an "L" shape when viewed from the side, and the rear side protrudes downward to form a vertically extending portion 19, and left and right axles 3, 3 are provided at the lower portion on the rear side of the transmission case 2. The transmission transmission mechanism 20 is provided in the vertically extending portion 19 at the rear of the transmission case 2, and the input shaft 18 is disposed almost directly above the axles 3, 3, and the output is output almost directly above the input shaft 18. A shaft 17 is provided. Further, the HST 12 is disposed below the engine 11, the axles 3 are disposed below the HST 12, and the driving force of the engine 11 is transmitted from above to below to drive the traveling wheels 1.1. With this configuration, the transmission layout can be simplified, and the maintainability can be improved. Further, the transmission case 2 can be made compact, and the size of the machine can be reduced.

Further, the upper portion of the transmission case 2 is projected forward to form a front-rear extension portion 28, and a PTO
The shaft 21 is pivotally supported, and as shown in FIG. 2, pipe members 99 are projected to the left and right of the front of the transmission case 2, and the transmission case 22 and the side frame 23 are moved to the front of the transmission case 2 via the pipe members 99. To the working machine 24 via the transmission case 22 and the side frame 23.
, A work machine 24 is mounted on the front side of the transmission case 2, and the transmission case 22 and the side frame 23 rotatably support both ends of a rotary shaft 25, and a plurality of cutting rotary blades commonly used for tilling and mowing. Are attached to the rotary shaft 25, and each of the cutting rotary blades 26, 26,.
The upper surface and the right and left of are closed by a rotary cover 27 to constitute the working machine 24.

A PTO transmission mechanism 29 comprising a PTO clutch, a forward / reverse switching mechanism, a speed reduction mechanism, and the like is provided in a front-rear extension portion 28 of the transmission case 2.
A PTO shaft 21 is provided in front of the rotary shaft 2 of the working machine 24.
5 by rotating the cutting rotary blades 26 at a low speed in the same direction as the forward rotation of the traveling wheels 1.1 (the direction of arrow A, hereinafter referred to as "forward rotation direction"). In the opposite direction (hereinafter "reverse direction")
The cutting rotary blades 26 are rotated at high speed to perform mowing work.

Further, this cultivator is provided with a post-working machine 30 (FIG. 1) for performing a banking work at the same time as the cultivation work of the working machine 24 (FIG. 1). The post-working machine 30 is detachably provided, and the post-working machine 30 is rotated around the hitch pin 32 so as to be able to move up and down. The rear work machine 30 is lifted to the side to be supported in the non-work position.

Next, the vertically extending portion 1 of the transmission case 2
The above-mentioned traveling speed change mechanism 20 disposed in the interior 9 will be described. FIG. 3 is a developed plan sectional view showing the configuration of the transmission system inside the transmission case.

That is, as shown in FIG. 3, the HST 12 is provided with a trunnion lever 12a for changing the rotation direction and the rotation speed of the output shaft 52. The trunnion lever 12a is provided with a wire, a link mechanism or the like. Through
It is linked to the main shift lever 6 of the operation unit 9. The output shaft 52 of the HST 12 has a pipe-shaped deceleration output shaft 53.
Are mounted so that they cannot rotate relative to each other, and a gear 53 a is engraved on the outer peripheral surface of the reduction output shaft 53. Further, a speed reduction intermediate shaft 65 is disposed below the speed reduction output shaft 53 (above in FIG. 3), and a gear 66 is fixed to the speed reduction intermediate shaft 65.
The gear 66 is engaged with the gear 53a of the reduction output shaft 53. A gear 65a is formed on the reduction intermediate shaft 65,
The gear 65a is meshed with a gear 67 fixed on a deceleration final shaft 70 loosely fitted on the deceleration output shaft 53. A sprocket 68 is integrally formed with the final deceleration shaft 70. The sprocket 68 is driven by an input sprocket 69 provided in a ball differential mechanism 55 for differentially connecting the left and right axles 3, 3 with each other. They are linked and connected via a chain 54. The ball differential mechanism 55 is provided with a differential lock mechanism 55a which is linked to the differential lock lever 8 provided on the operation unit.

With the above configuration, the power of the engine 11 input to the input shaft 18 via the input pulley 16
After the rotation speed and the rotation direction are controlled at T12,
From output shaft 52 to deceleration output shaft 53 → gear 53a → gear 66
→ After being transmitted to the reduction intermediate shaft 65 and decelerated, the gear 65
a → gear 67 → deceleration final shaft 70, and drives the left and right axles 3.3 from the sprocket 68 via the traveling drive chain 54 and the ball differential mechanism 55.

Next, the front and rear extending portions 2 of the transmission case 2
The above-mentioned PTO speed change mechanism 29 disposed in the inside 8 will be described. That is, as shown in FIG.
An output sprocket 71 is integrally formed, and a transmission shaft 72 provided in front of the input shaft has an input sprocket 7
3 is freely rotatably fitted to the two sprockets 71.7
3 are interlocked via a PTO input chain 56.
The transmission shaft 72 has a PTO clutch slider 7.
4 are spline-fitted so as to be relatively non-rotatable and slidable in the axial direction.
4a is provided. Accordingly, when the PTO clutch slider slides rightward in FIG. 3, the pawl clutch 74a engages with the input sprocket, the PTO clutch is brought into "contact", and the rotation of the input sprocket 73 causes the PTO clutch slider 74 to rotate. Is transmitted to the transmission shaft 72 via the Further, a reverse gear 77 is fixed to the PTO clutch slider 74. The PTO clutch slider is linked to the main shift lever of the operation section via a link mechanism, and the main shift lever is tilted in the left-right direction of the machine to perform the connection / disconnection operation of the PTO clutch.

Further, a tilling-side output sprocket 75 is integrally formed on the transmission shaft 72, and the sprocket 75 is rotatably mounted on the above-mentioned PTO shaft 21 which is rotatably supported in front of the transmission shaft 72. 76 is interlocked and connected via a low-speed normal rotation chain 61. And PTO
A forward / reverse switching clutch slider 78 is spline-fitted to the shaft 21 so as to be relatively non-rotatable and slidable in the axial direction. The forward / reverse switching clutch slider 78 includes a tilling-side input claw clutch 78a and a mowing-side input gear 78b. Provided.

With the above configuration, when the forward / reverse switching clutch slider 78 slides rightward in FIG. 3, the engagement between the reverse rotation gear 77 and the mowing side input gear 78b is released, and the sprocket 76 is moved to the tilling side. Input claw clutch 7
8a is engaged, the rotation of the sprocket 76 is transmitted to the PTO shaft 21 via the forward / reverse switching clutch slider 78, and the rotary shaft 25 rotates forward at a low speed to perform the tilling operation. On the other hand, when the forward / reverse switching clutch slider slides to the left in FIG. 3, the engagement between the sprocket 76 and the tilling-side input pawl clutch 78a is released.
The reverse rotation gear 77 and the mowing side input gear 78b mesh with each other, and the rotation of the reverse rotation gear 77 is transmitted to the PTO shaft 21 via the forward / reverse switching clutch slider 78, thereby rotating the rotary shaft 25 at a high speed. The mowing work is performed.

That is, the power transmitted from the input shaft 18 to the PTO output sprocket 71 → the PTO input chain 56 → the input sprocket 73 → the PTO clutch slider 74 is bifurcated, one of which is the transmission shaft 72 → the sprocket 75 → low speed. The transmission is performed while reducing the speed from the forward rotation chain 61 to the sprocket 76, and the other is accelerated by the reverse rotation gear 77 and forward / reverse conversion of the rotation direction is performed. And sprocket 7
6 or the power of the reverse rotation gear 77 is alternatively input to the forward / reverse switching clutch slider 78 to transmit the low-speed forward or high-speed reverse power to the PTO shaft 21.

Next, the transmission case 2 and the engine 11
Will be described with reference to FIGS. 1, 4, and 5. FIG. FIG. 4 is a side sectional development view showing a fixed position of the transmission case and the engine, and FIG. 5 is a sectional view taken along the line AA in FIG.

As shown in FIGS. 1 and 4, the engine 11 has a mounting surface formed on the upper surface of the transmission case 2 divided into front and rear portions, and the engine is directly fixed on the mounting surface. . That is, in FIG. 4, horizontally arranged mounting surfaces 2a of the engine 11 are provided integrally on the upper surface of the front and rear halfway of the transmission case 2 and the upper surface of the rear portion, and a space between the front and rear mounting surfaces 2a. The space 2b is a heat radiation space. Further, bolt holes are opened on both left and right sides of the mounting surfaces 2a, 2a, and the recesses 2c, 2c,
2d and 2d are formed as a nut insertion and heat dissipation recess.

In this manner, the mounting base 11b provided at the lower part of the engine 11 is placed on the horizontal surfaces 2a, 2a, and the engine 11 and the transmission case 2 are directly fixed by bolts and nuts. The contact area between the engine 11 and the transmission case 2 is limited to only the mounting surfaces 2a and 2a, and the contact area is reduced so that the amount of heat transmitted from the engine 11 to the transmission case 2 is reduced.

The engine 1 is located above the space 2b.
The oil pan 11a disposed at the lower portion of the transmission case 1 is located at a position where the joint between the engine 11 and the transmission case 2 is separated from the oil pan 11a so that heat is less likely to be transmitted to the transmission case 2. And the space 2b
The surface area for dissipating heat increases, and the surface areas of the recesses 2c and 2d in which the bolts connecting the engine 11 and the transmission case 2 are arranged also increase, so that the heat dissipating effect can be enhanced.

[0025]

The present invention is configured as described above.
The following effects are obtained. That is, a mounting surface for mounting and fixing the engine is integrally formed on the upper surface of the transmission case, and the engine is directly fixed on the mounting surface. Therefore, the dimension between the engine and the transmission case can be accurately determined, the error can be reduced, and the mounting accuracy can be improved. Further, by omitting the engine stand, the number of parts can be reduced, and the cost can be reduced.

According to a second aspect of the present invention, the mounting surface is divided and provided at the front and rear of the transmission case, a space is provided between the front and rear mounting surfaces, and a space is provided between the engine and the transmission case. Thus, the contact area of the portion where the engine and the transmission case are fastened can be reduced, and the amount of heat transmitted from the engine side can be reduced.
That is, because of the space, both the engine and the transmission case can be cooled, the oil burns and cannot be lubricated, the pistons and valves are seized, abnormal combustion occurs in the engine combustion chamber, and each part is thermally expanded. This eliminates the source of troubles such as deformation and leads to improved operation stability and durability.

Further, since the space is disposed substantially directly below the oil pan of the engine, heat conduction from the oil pan, which is high in temperature, to the transmission side can be suppressed, and troubles such as malfunctions can be prevented. Can cut off the source.

[Brief description of the drawings]

FIG. 1 is a side view showing an overall configuration of a cultivator according to one embodiment of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a developed plan sectional view showing the configuration of a transmission system inside the mission.

FIG. 4 is a side sectional development view showing a fixed position of a transmission case and an engine of the present invention.

FIG. 5 is a sectional view taken along the line AA in FIG. 4;

[Explanation of symbols]

 2 Transmission case 2a Mounting surface 2b Space 2c / 2d recess 11 Engine 11a Oil pan 17 Engine output shaft 18 HST input shaft

Continuation of the front page (72) Inventor Masanori Nakano 1-32 Chaya-cho, Kita-ku, Osaka-shi, Osaka F-term (reference) in Yanmar Agricultural Machinery Co., Ltd. 2B033 AA06 AB01 AB11 AB18 AC05 BA01 BB04 CA01 CA31 ED01 ED04 3D035 CA26 CA27 3D039 AA04 AA18 AA20 AB16 AC33 AC65 AD36 AD54

Claims (3)

[Claims] 1. A cultivator, wherein a mounting surface for mounting and fixing an engine is integrally formed on an upper surface of a transmission case, and the engine is directly fixed on the mounting surface. Engine support structure. 2. The vehicle according to claim 1, wherein the mounting surface is divided into front and rear portions of the transmission case, a space is provided between the front and rear mounting surfaces, and a space is provided between the engine and the transmission case. Item 2. An engine support structure for a cultivator according to item 1. 3. The engine support structure for a cultivator according to claim 2, wherein the space is disposed substantially directly below an oil pan of the engine.