JP2013113384A - Tractor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tractor having a breather mechanism capable of inexpensively implemented with a simple constitution by improving a conventional breather mechanism.SOLUTION: The tractor has the breather mechanism including a breather hose (9) connected-disposed in a position that an inner pressure of a transmission case (3) or the like varies, and a cap (11) provided with a deformed vent (10) provided on an insertion part to the inside of the breather hose (9), deformed from hose inside diameter and air-permeable. In the tractor, a part of the cap (11) corresponding to an end side of the breather hose (9) includes a step (12) which comes in contact with only the end of the outer-diameter side of the breather hose (9) other than the end of the inner-diameter side when the cap is inserted in the innermost.

Description

  The present invention relates to a tractor that is an agricultural machine, and more particularly to a breather mechanism used for a tractor.

  The breather mechanism disclosed in Patent Document 1 has a problem that the configuration is complicated and the cost is high.

JP 2009-208673 A

  The present invention provides a breather mechanism that can be implemented at a low cost with a simple configuration by improving the breather mechanism having the structure as in the conventional example.

In order to solve the above problems, the present invention has taken the following technical means.
That is, the present invention as defined in claim 1 is configured such that the breather hose (9) continuously arranged at a site where the internal pressure changes, such as the transmission case (3), and the insertion portion into the breather hose (9) are formed from the inner diameter of the hose. A tractor having a breather mechanism including a cap (11) provided with a deformable ventilation portion (10) capable of different ventilation.

  According to the above configuration, the air inside the mission case (3) passes between the breather hose (9) and the cap (11) through the passage of the deformed vent (10) formed between the breather hose outer side and the cap inner side. It is exhausted from between.

  According to a second aspect of the present invention, in the first aspect, the end face side corresponding portion of the breather hose (9) of the cap (11) has an inner diameter side end face of the breather hose (9) when the cap is fully inserted. The tractor according to claim 1, wherein a step portion (12) is provided so as to contact only the end surface on the outer diameter side while leaving a gap.

  According to the above configuration, even when the cap (11) is inserted to the back of the hose (9), the stepped portion (12) contacts only the outer diameter side end face of the hose, so that the inner diameter side end face is not crushed, The air permeability can be maintained well.

  According to a third aspect of the present invention, in the first or second aspect, the exhaust passage (13) formed between the outer peripheral surface of the breather hose (9) and the inner peripheral surface of the cap (11) includes: The tractor according to claim 1 or 2, wherein a filter (14) made of foamed urethane or the like having a high air permeability is interposed.

  According to the said structure, infiltration of water and dust is prevented reliably by providing a filter (14) in an exhaust passage (13).

  In short, according to the present invention described in claim 1, since it is a breather mechanism comprising a breather hose and a cap provided with a deformed ventilation portion capable of venting different in shape from the inner diameter of the hose at the insertion portion into the breather hose. The configuration is extremely simple, and the number of parts is small, so that it can be implemented at a low cost.

  According to the second aspect of the present invention, in addition to the effect of the first aspect, even if the cap is inserted to the back of the hose, the cap contacts only the outer diameter side end surface of the hose by the stepped portion. Crushing to the inner diameter side end face of the hose is eliminated, and air permeability can be kept good.

  According to the third aspect of the present invention, in addition to the effect of the first or second aspect, by providing a filter in the exhaust passage, it is possible to further enhance the effect of preventing water and dust from entering.

Side view of tractor Partial perspective view of tractor Side sectional view of main part of breather mechanism Perspective view of the main part Bottom view of cap S1-S1 sectional view of FIG. The perspective view which shows the structural example of a hood bracket Side view of the main part of a tractor equipped with a rotary work machine Side view of the main part Side view of stand swing mechanism Another side view of stand swing mechanism Plan view of the main part of the handle operating part of the tractor (A), (b) is a side view of the idling change lever operating mechanism Exploded perspective view of the main part Explanatory drawing of front wheel steering control mechanism

An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a tractor. An engine E is mounted inside a bonnet 2 at the front of the traveling vehicle body 1, and the rotational power of the engine E is transmitted to a transmission in the transmission case 3 and is decelerated by the transmission. The generated rotational power is transmitted to the front wheel 4 and the rear wheel 5. A steering handle 8 for steering the front wheels 4 and 4 is provided in front of the driver's seat 7 installed in the cabin 6.

  On the mission case 3, a breather mechanism comprising a breather hose 9 and a cap 11 provided with a deformable ventilation portion 10 having a shape different from the inner diameter of the hose at a portion inserted into the breather hose is provided. The irregularly ventilating portion 10 has a cross-shaped configuration that changes into the shape of irregularities 10a and 10b, and is formed so that the concave portion 10a serves as a ventilation path.

  The cap 11 is provided with a stepped portion 12 so as not to crush the inner diameter side end face of the hose even if it is inserted to the back of the hose 9, and the inner diameter of the cap is made larger than the outer diameter of the breather hose 9. The hose is overlapped so that the end of the hose is wrapped from the outside, and a predetermined gap is provided so that the exhaust passage 13 is formed between the outer peripheral surface of the breather hose 9 and the inner peripheral surface of the cap 11. Yes. The exhaust passage 13 is provided with a filter 14 such as foamed urethane having high air permeability so that water and dust do not enter.

  The embodiment shown in FIG. 7 will be described. In this example of FIG. 7, a hood bracket 17 that supports the hood bonnet frame 16 and a muffler bracket 18 that holds the muffler from the engine are mainly used as strength members, and a connector that connects the front and rear in the meantime. 19 is configured to hold the hood via 19.

In the past, the support member was extended upward from a mission case different from the engine via a vertical column, but it was connected to the bracket of the muffler, and the structure was complicated.
Moreover, there is a power steering valve in a narrow space, and it was necessary to remove many surrounding parts for maintenance. According to the configuration of the above example, it is configured by bolting the bracket mounting points at four points, and it takes no effort to disassemble the parts required for power steering unit maintenance, and the structure is simplified by reducing the number of column members It becomes easy to assemble.

  As shown in FIGS. 8 and 9, a stand 22 is provided on the rear cover 21 of the rotary work machine 20, and when the rotary work machine is lowered from the state shown in FIG. 8 (work machine raised state) to the state shown in FIG. Instead of a support bar, the rear cover 21 is configured to spring up.

  By providing an up / down switch 24 (24U, 24D) for moving the rotary work machine up and down by hydraulic pressure in the fender portion 23 of the tractor, the lift lock lever is operated and the stand is attached, so that the work machine does not turn to the seat side. You can operate the lock on the side.

  If mud adheres to the rear cover, the rear cover becomes heavier, making it difficult to lift the rear cover. According to the above, the rear cover can be easily raised and locked by using the hydraulic pressure of the tractor.

  An engine stop switch 25 may be provided near the up / down switch 24. When the engine is stopped by the switch 25, it is desirable to set so that electricity does not flow even in the key switch "ON" state.

Note that the stand can be prevented from being damaged by an erroneous operation by configuring the tiller depth control sensor to detect a change in the rear cover angle.
Further, the stand 22 is provided with a swing mechanism as shown in FIG. 10 so that an excessive force is not applied to the stand grounding portion. That is, the stand 22 is pivotally connected to the stand mounting bracket 25 fixed to the rear cover via the pin shaft 26 and the spring 27. Therefore, due to the action of the spring 27, the stand maintains a constant angle when a large force is not applied. After the stand is grounded, the stand rotates as necessary, so that the rear cover is smoothly lifted.

Further, as shown in FIG. 11, an unreasonable force is not applied to the stand grounding portion even if the swing grounding portion 28 is configured to swing around the pin shaft 26 on the grounding side of the stand.
In the example of FIG. 12, an idling change lever 33 that changes the idling speed of the engine is provided near the throttle lever 31 provided on the handle post 30. That is, the throttle wire 32 is returned to the idling state by operating the idling change lever 33 (the state shown in FIGS. 13A to 13B), and the roll pin 34 is formed in the L-shaped guide groove 36 provided in the cylindrical body 35. When in the position shown in FIG. 13 (b), the slot lever is restricted. A seat plate 38 serving as a stopper for a built-in tension spring 37 is fixed to the bottom of the cylindrical body 35 by welding.

  In the example of FIG. 15, the left and right front wheels 4 and 4 are steered by operating the steering handle 8 via a steering mechanism including a power steering unit 40, a steering arm 41, a tie rod 42, a knuckle arm 43, and the like. The steering movement is transmitted to the planetary gear mechanism 45 by a variable hydraulic motor 44 so that the front wheel speed is changed. The hydraulic motor is driven by a plunger pump. The angle of the swash plate of the plunger pump is set to increase (increase in the number of rotations) in proportion to the front wheel turning angle. That is, the rotational speed of the front wheels changes according to the front wheel turning angle, and turning control with a small turn is possible.

3 Mission case 9 Breather hose 10 Deformed ventilation part 11 Cap 12 Step part 13 Exhaust passage 14 Filter

Claims (3)

  A breather hose (9) arranged continuously at a site where the internal pressure changes, such as the transmission case (3), and a deformed vent (10) capable of venting different in shape from the inner diameter of the hose at the insertion portion into the breather hose (9) The tractor which has a breather mechanism which consists of a cap (11) provided with.   The step (9) of the cap (11) corresponding to the end surface side of the breather hose (9) has a step so as to contact only the outer diameter side end surface, leaving the inner diameter side end surface of the breather hose (9) when the cap is fully inserted. The tractor according to claim 1, wherein a portion (12) is provided.   An exhaust passage (13) formed between the outer peripheral surface of the breather hose (9) and the inner peripheral surface of the cap (11) is provided with a filter (14) made of foamed urethane or the like having a high air permeability. The tractor according to claim 1, wherein the tractor is provided.

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