JP4085048B2 - Farm machine transmission case - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a transmission case for a farm work machine such as a rotary tiller work machine that is provided so as to be movable up and down behind the machine body.

  Conventionally, an opening (a stopper such as a retaining ring for preventing a sprocket from being inserted) is provided on the upper outer side of the transmission case, and the opening is plugged with a cap.

  Usually, this cap is provided with a breather hole and a hole which is a passage for air and a passage for oil. (For example, see Patent Document 1)

JP-A-8-80101

  Normally, the breather hole and the air passage / oil passage as described above are provided at the upper end and the lower end on a virtual vertical line passing through the center of the cap at the time of a tilling work posture of the rotary tiller, There is no problem in this tillage work posture because the oil reservoir position and breather hole position are separated, but when the rotary tiller is changed from the tillage work position to the moving / turning position, the oil reservoir position and breather hole position , And the oil may be ejected from the breather hole.

  Therefore, the present invention relates to a farming machine transmission case in which a double-structured case cap formed by outer and inner cap portions is provided on a farming machine transmission case to be installed to be movable up and down at the rear of the machine body. Sometimes a breather hole is opened above a virtual horizontal line passing through the center of the outer cap part and a plurality of holes are opened below a virtual horizontal line passing through the center of the inner cap part, and at least one of the plurality of holes in the inner cap part is opened. Are arranged on the front side of the aircraft from the virtual vertical line passing through the center of the inner cap portion.

  In addition, on the first quadrant formed by the virtual horizontal line and the virtual vertical line passing through the center of the case cap, on the boundary line between the first quadrant and the second quadrant, or on the boundary line between the first quadrant and the second quadrant While the breather hole is opened, at least one of the plurality of holes in the inner cap portion is arranged on a substantially vertical line with the horizontal ground surface when the farm machine is lowered, and at least one of the farm machine is raised. It is arranged on a substantially vertical line with the horizontal ground surface in a non-working posture.

  Thus, in the transmission case of a farming machine provided with a double case cap formed by the outer and inner cap parts on the transmission case of the farming machine to be installed so as to be able to move up and down at the rear of the machine, A breather hole is opened above a virtual horizontal line passing through the center of the outer cap part, and a plurality of holes are opened below the virtual horizontal line passing through the center of the inner cap part. At least one of the plurality of holes in the inner cap part is opened. Is placed on the front side of the aircraft from the imaginary vertical line passing through the center of the inner cap, so that the breather hole and the oil reservoir position (inside The distance from the imaginary vertical line passing through the center of the cap to the front of the aircraft) It is possible to reduce the oil injection of al.

  In addition, on the first quadrant formed by the virtual horizontal line and the virtual vertical line passing through the center of the case cap, on the boundary line between the first quadrant and the second quadrant, or on the boundary line between the first quadrant and the second quadrant While the breather hole is opened, at least one of the plurality of holes in the inner cap portion is arranged on a substantially vertical line with the horizontal ground surface when the farm machine is lowered, and at least one of the farm machine is raised. By placing it on a substantially vertical line with the surface of the horizontal surface in a non-working posture, the distance between the breather hole of the outer cap part and the oil pool position is maximized when the aircraft is moving / turning, and the oil from the breather hole Spout can be minimized.

  Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a side view of the whole, FIG. 2 is an explanatory side view of a tillage rotary working machine. In FIG. 1, 1 is a tractor which is a farm vehicle, and left and right front wheels 4 and 4 on both sides of a bonnet 3 in which an engine 2 is installed. The steering wheel 5 is provided at the rear of the bonnet 3, the driver's seat 6 is installed behind the handle 5, and the left and right rear wheels 7, 7 are installed behind the driver's seat 6. A person sits on the driver's seat 6 and travels, and a tilling rotary working machine 10 having a tilling rotary 9 is mounted on the rear side of the tractor body via a three-point link mechanism 8 so as to be able to move up and down to perform tilling work. It is composed.

  2, 3, and 4, the rotary work machine 10 is a side drive type, a gear box 11 is disposed in the center, and an input shaft 12 is connected to the PTO shaft of the tractor 1 via a drive shaft with a universal joint. Power is transmitted by coupling, the beam 13 is projected from both sides of the side of the gear box 11, an upper part of the chain case 14 as a transmission case is fixed to the outer end of the beam 13, and a rotary shaft is attached to the lower part of the chain case 14. The tilling claw shaft 15 is horizontally mounted, and on the tilling claw shaft 15, a plurality of rotary claws 16 which are rotary claws are planted radially in a side view, and above the rotation trajectory of the cultivation claw 16. Is covered with a rotary cover 17 and both sides are covered with a side cover 18. The tillage claw shaft 15 is driven through the gear in the gear box 11, the transmission shaft in the beam 13, the sprockets 20 and 21 and the chain 22 in the chain case 14, and the tillage claw 15 is rotated to rotate the tillage. Like to do.

  A rear cover 25 having a side cover 24 is slidably connected to the rear end of the rotary cover 17 via a fulcrum shaft 23.

  As shown in FIGS. 5 and 6, a stopper such as a retaining ring 28 for preventing the sprocket 20 from coming off by forming a hole 26 larger in diameter than the transmission shaft 19 at a position opposite to the shaft end of the transmission shaft 19 of the chain case 14. It is provided so that it can be inserted and removed.

  A case cap 27 made of rubber or plastic that always closes the hole 26 is provided.

  As shown in FIG. 7, the case cap 27 is provided in a double structure having an outer cap portion 29 and an inner cap portion 31 to be fitted to the spigot portion 30 of the outer cap portion 29, and is provided on the upper portion of the outer cap portion 29. The breather hole 32 and a plurality of flow holes 33 and 34 serving as passages for air and oil are formed in the lower portion of the inner cap portion 31.

  As shown in FIG. 8, when the working machine 10 is in the lowered working posture, the breather hole 32 is opened above a virtual horizontal line a passing through the center of the outer cap portion 29 and the flow holes 33 and 34 are formed on the inner cap portion 31. The at least one hole 34 of these circulation holes 33 and 34 is arranged on the front side of the body from the imaginary vertical line b passing through the center of the inner cap portion 31.

  As a result, when the working machine 10 is in the lowered working posture, as shown in FIG. 8, the oil that has entered into the oil reservoir position c having a height of about 1/3 in the cap 27, which is the position of the hole 34 of the inner cap portion 31, is accumulated. In addition, when the working machine 10 is in a moving / turning posture in which it tilts forward, as shown in FIG. 9, the flow hole 34 is in the lower position, the oil is drained and the oil reservoir position c is lowered, and the breather hole 32 and the flow hole 34 are separated. The distance L is greatly separated as compared with the conventional case, so that the oil ejection from the breather hole 32 is reduced.

  As is clear from the above, a double-structured case formed by outer and inner cap portions 29 and 31 on a chain case 14 that is a transmission case of a rotary working machine 10 that is an agricultural working machine that is mounted so as to be movable up and down at the rear of the machine body. In the transmission case of the agricultural machine provided with the cap 27, when the agricultural machine 10 is lowered, the breather hole 32 is located above the virtual horizontal line a passing through the center of the outer cap part 29 and the virtual horizontal line passing through the center of the inner cap part 31. A plurality of holes 33, 34 are respectively opened below a, and at least one of the plurality of holes 33, 34 of the inner cap part 31 is placed on an imaginary vertical line b passing through the center of the inner cap part 31. The breather hole 3 provided in the outer cap portion 29 when the machine body is moved and turned so as to place the work machine 10 in the lifted non-working posture. And the oil reservoir position (the hole 34 disposed on the front side of the machine body from the imaginary vertical line b passing through the center of the inner cap portion 31) can be separated from the conventional distance, and the oil jet from the breather hole 32 Can be reduced.

  Further, as shown in FIGS. 8 and 9, the first quadrant formed by the virtual horizontal line a and the virtual vertical line b passing through the center of the case cap 27 or the boundary line b between the first quadrant and the second quadrant or the second quadrant. In addition, the breather hole 32 is opened in the vicinity of the boundary line b between the first quadrant and the second quadrant, and at least one of the plurality of holes 33 and 34 of the inner cap portion 31 is lowered by the work machine 10. Arranged on the substantially vertical line b with the horizontal ground surface in the working posture (FIG. 8), and at least one hole 34 is disposed on the substantially vertical line b with the horizontal ground surface in the non-working posture of the work machine 10 ( 9), the distance L between the breather hole 32 of the outer cap portion 29 and the oil reservoir position can be maximized at the time of movement / turning of the airframe, and the oil ejection from the breather hole 32 can be suppressed to the minimum.

The whole tractor side view. Side surface explanatory drawing of a rotary working machine. Plane explanatory drawing of a rotary working machine. The side view of a chain case. Sectional drawing of a chain case. Explanatory drawing of a case cap part. Explanatory drawing of a case cap. Explanatory drawing of the cap at the time of the working posture of a working machine. Explanatory drawing of the cap at the time of the movement / turning posture of the work implement.

Explanation of symbols

10 Rotary work machine 14 Chain case (Transmission case)
27 Case cap 29 Outer cap portion 31 Inner cap portion 32 Breather holes 33 and 34 Hole a Virtual horizontal line b Virtual vertical line

Claims (2)

  In the transmission case of a farm work machine provided with a double case cap formed by the outer and inner cap parts on the transmission case of the farm work machine to be installed so as to be able to move up and down at the rear of the machine body, The breather hole is opened above the imaginary horizontal line passing through the center, and the plurality of holes are opened below the imaginary horizontal line passing through the center of the inner cap part, and at least one of the plurality of holes in the inner cap part is opened as the inner cap part. A farming machine transmission case, which is arranged in front of the aircraft from a virtual vertical line passing through the center of the farm.   A breather hole in the first quadrant formed by a virtual horizontal line and a virtual vertical line passing through the center of the case cap or on the boundary line between the first quadrant and the second quadrant or in the second quadrant and on the boundary line between the first quadrant and the second quadrant At least one of the plurality of holes in the inner cap portion is arranged on a substantially vertical line with the horizontal ground surface when the farming machine is lowered, and at least one of the holes is not working 2. The transmission case for an agricultural machine according to claim 1, wherein the transmission case is disposed on a substantially vertical line with a horizontal ground surface in a posture.

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