JP2016161119A - Oil filling plug - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil filling plug that can prevent leakage of oil and intrusion of rain water.SOLUTION: An oil filling plug 31 blocks an oil filling hole 30 of case 4, 8 that is an oil storage body of an agricultural machine 1. The oil filling plug 31 includes a plug body 34 with an air discharge hole for discharging internal air from the case 4, 8. An elastic body 35 for opening and closing the air discharge hole is provided in a groove part in an upper side outer peripheral part of the plug body 34 so as to be detachable.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an oil filler plug that closes an oil hole of an oil container.

  Conventionally, for example, an oil filler plug described in Patent Document 1 below is known.

  This conventional oil filling plug closes an oil filling hole formed in the upper surface of an oil container (drive shaft case) in which, for example, a rotary drive shaft and the like are disposed. An air discharge hole (breather hole) for discharging the air is formed.

Japanese Utility Model Publication No. 63-2404 (Fig. 2)

  However, in the conventional oil filling tap, for example, oil in the oil container may leak through the air discharge hole, or rainwater may enter the oil container through the air discharge hole during rainfall.

  This invention is made | formed in view of such a point, and it aims at providing the oil-injection stopper which can prevent the leakage of oil and invasion of rainwater.

  The oil injection plug according to claim 1 is an oil injection plug that closes the oil injection hole of the oil container, the plug main body having an air discharge hole for discharging air in the oil container, and the plug main body. And an elastic body that opens and closes the air discharge hole.

  The oil plug according to claim 2 is the oil plug according to claim 1, wherein the plug main body has a groove portion communicating with the air discharge hole, and the elastic body is detachably provided in the groove portion of the plug main body. It is what.

  According to a third aspect of the present invention, in the lubricating plug according to the first or second aspect, the elastic body is formed of an elastic elastic ring member, and the circular elastic member is in a state before elastic deformation. Then, the air discharge hole is closed, and the air discharge hole is opened in a state after being elastically deformed based on the pressure of air in the oil container.

  The oil filler plug according to claim 4 is the oil filler plug according to any one of claims 1 to 3, wherein the oil container is a case in which the power transmission means of the agricultural machine is disposed.

  According to the present invention, since the elastic body that opens and closes the air discharge hole is provided in the plug body, oil leakage and rainwater intrusion can be prevented.

It is a side view of the agricultural working machine provided with the oiling tap which concerns on the 1st Embodiment of this invention. It is a rear view fragmentary sectional view of an agricultural working machine same as the above. It is a side view of the oiling tap of an agricultural working machine same as the above, (a) is a figure which shows the state before elastic deformation of an elastic body, (b) is a figure which shows the state after elastic deformation of an elastic body (air discharge state). . It is a side view of the oil filler tap concerning the 2nd Embodiment of this invention. It is a side view of the oil filler plug concerning a 3rd embodiment of the present invention. It is a side view of the oil filler plug which concerns on the 4th Embodiment of this invention.

  A first embodiment of the present invention will be described with reference to FIGS.

  In the figure, reference numeral 1 denotes an agricultural machine. The agricultural machine 1 is connected to a rear portion of a tractor (not shown), which is a traveling vehicle, for example. Work.

  The farm work machine 1 includes a machine body 2 connected to a three-point link (a farm work machine lifting support device) at the rear of a tractor (not shown).

  The airframe 2 has a mission case (oil housing body) 4 that is a box-shaped transmission case in which a front-rear input shaft 3 protrudes forward at a central portion in the left-right direction. The input shaft 3 is connected to the PTO shaft of the tractor via a joint, and rotates when the PTO shaft rotates to input power from the tractor side to the agricultural machine 1 side.

  The left and right side portions of the mission case 4 of the airframe 2 are respectively attached to the inner ends of the frame pipes 6 and 7 that are elongated in the left-right direction. An upper part of a chain case (oil container) 8, which is a box-shaped transmission case having a vertical shape in the vertical direction, is attached to the left end which is the outer end of the left frame pipe 6. An upper portion of a plate-like bracket 9 having a vertically long shape is attached to a right end portion which is an outer end portion of the right frame pipe 7.

  Further, between the lower part of the chain case 8 and the lower part of the bracket 9 that are spaced apart from each other on the left and right, a cultivating body (rotary) 11 that performs cultivating work while being rotated by power from the power transmission means 10 connected to the input shaft 3 Is built.

  The cultivating body 11 has a cultivating shaft 12 that rotates in a predetermined direction by power from the power transmission means 10, and a plurality of cultivating claws 13 that are detachably attached to the cultivating shaft 12.

  Further, a plate-shaped tilling cover body 15 that covers the upper portion of the tilling body 11 is disposed above the tilling body 11. The tillage cover body 15 has a curved plate shape that is convex upward, for example, and is fixed to the body 2.

  At the rear end of the tillage cover body 15, a plate-shaped leveling body (level plate) 16 that performs leveling work behind the tillage body 11 is provided so as to be pivotable in the vertical direction about a horizontal axis 17. It has been. A back plate 18 is erected on the rear surface of the leveling body 16, and a ground pressure adjusting means 19 for adjusting the ground pressure of the leveling body 16 is provided between the back plate 18 and the machine body 2. Further, a gauge wheel 20 for adjusting the tilling depth of the tilling body 11 is provided at the front part of the body 2.

  Here, the power transmission means (transmission means) 10 for transmitting the power from the input shaft 3 to the tilling shaft 12 includes a first bevel gear 21 fixed to the input shaft 3 and the first bevel gear 21 as shown in FIG. A second bevel gear 22 meshed with one bevel gear 21; a drive shaft 23 to which the second bevel gear 22 is fixed at the right end; a first sprocket 24 fixed to the left end of the drive shaft 23; A second sprocket 25 fixed to the left end of the shaft 12 and an endless chain 26 spanned between the first sprocket 24 and the second sprocket 25 are provided.

  The first bevel gear 21 and the second bevel gear 22 are disposed in the mission case 4 of the airframe 2. The first sprocket 24, the second sprocket 25, and the chain 26 are disposed in the chain case 8 of the body 2.

  In the mission case 4 which is a case as an oil container, lubricating oil which is oil for lubricating the gears 21 and 22 when the power transmission means 10 is driven is stored. Similarly, in the chain case 8 which is a case as an oil container, lubricating oil which is oil (oil) for lubricating the sprockets 24 and 25 and the chain 26 when the power transmission means 10 is driven is accommodated. Yes.

  As shown in FIG. 1, an oil supply hole 30 for injecting lubricating oil is formed in the upper surface portion of the chain case 8, and the oil supply hole 30 is closed by an oil supply plug 31 so as to be opened and closed. Similarly, as shown in FIG. 2, an oil injection hole 30 for injecting lubricating oil is formed in the upper surface of the mission case 4, and the oil injection hole 30 is closed by an oil supply plug 31 so as to be opened and closed. .

  In other words, each case 4, 8 (hereinafter simply referred to as “case”) of the agricultural machine 1 is detachably attached with an oil filler plug 31 that closes and opens the oil hole 30 of the case. In addition, when injecting (lubricating) the lubricating oil into the case from the lubricating hole 30, the lubricating plug 31 is removed from the case.

  Here, as shown in FIG. 3, the oil plug 31 has an air discharge hole for discharging air in the case (high pressure air) to outside air (outside) outside the case when the pressure of the air in the case rises. A plug body 34 having a (breather hole) 33 and an elastically deformable circular annular elastic body 35 that is detachably provided on the plug body 34 and opens and closes the air discharge hole 33 are provided. The plug body 34 is made of, for example, rubber or resin.

  The plug body 34 has a cylindrical insertion portion 36 that is removably inserted into the lubrication hole 30 on the lower side, and is a disc-shaped non-insertion that is in contact with the upper surface of the case and located outside the case A portion 37 is provided on the upper side. That is, the plug body 34 is configured by a lower insertion portion 36 that is inserted into the oil supply hole 30 and an upper non-insertion portion 37 that is not inserted into the oil supply hole 30.

  The insertion portion 36 is divided into a small-diameter cylindrical portion 38 whose lower end protrudes into the case, and a large-diameter cylindrical portion 39 which is larger in diameter than the small-diameter cylindrical portion 38 and is fitted in the oil supply hole 30. Configured.

  A circular annular groove 41 having a U-shaped cross section (including a substantially U-shape) communicating with the air discharge hole 33 is formed on the outer peripheral portion of the non-insertion portion 37 (the upper outer peripheral portion of the plug body 34). The groove 41, which is a concave groove, has a groove bottom surface 41a and a pair of groove side surfaces 41b facing each other, and an air outlet portion 33b of the air discharge hole 33 is provided at a predetermined position (for example, one place) of the groove bottom surface 41a. An opening is formed.

  The through-hole-like air discharge hole 33, which is an air discharge passage through which air flows when air is discharged, has a large diameter for air discharge formed in the insertion portion 36 and a large diameter in the non-insertion portion 37. A small-diameter hole 43 for discharging air that is formed so as to communicate with the hole 42 and is bent in the middle is formed.

  An end opening of the large diameter hole 42 opposite to the small diameter hole 43 is an air inlet 33a of the air discharge hole 33. The air inlet 33a is formed on the lower surface of the plug body 34. Yes. Further, the end opening of the small diameter hole 43 opposite to the large diameter hole 42 is an air outlet 33b of the air discharge hole 33. This air outlet 33b opens on the upper side surface of the plug body 34. Is formed.

  The elastic body 35 is constituted by only one elastic elastic rubber member 45 (for example, an O-ring) made of elastically deformable rubber having a circular cross section and a circular ring shape. It is removably attached to the groove 41. That is, for example, the elastic body 35 capable of opening and closing the air discharge hole 33 is fitted in the groove 41 communicating with the air discharge hole 33 so as to be detachable. The diameter of the circular cross section of the annular elastic member 45 is substantially the same as the depth and width of the groove 41.

  As shown in FIG. 3A, when the elastic body 35 is in a state before being elastically deformed (normal time), the elastic body 35 is fitted and closely attached to the groove portion 41 of the plug body 34. The elastic body 35 covers and closes the air outlet portion 33b of the air discharge hole 33.

  However, as shown in FIG. 3B, when the pressure of the air in the case rises to a predetermined value or more due to the temperature rise in the case, the elastic body 35 is moved radially outward by the pressure of the high-pressure air. The elastic body 35 is elastically deformed so as to expand to the side and part of the cross-sectional shape becomes an elliptical shape.As a result, the elastic body 35 is separated from the groove bottom surface 41a and the one groove side surface 41b of the groove portion 41 and The air outlet 33b is opened, and the air in the case (high-pressure air expanded by heat) is discharged to the outside air.

  When the pressure of the air in the case decreases due to the discharge of air, the elastic body 35 returns to the original shape by the elastic restoring force and closes the air outlet portion 33b of the air discharge hole 33.

  Thus, the annular elastic member 45, which is the elastic body 35, closes the air discharge hole 33 in a state before being elastically deformed, and is radially outward (ie, away from the air discharge hole 33) based on the pressure in the case. The air discharge hole 33 is opened in a state after being elastically deformed toward ().

  Next, the operation and the like of the farm work machine 1 will be described.

  When the agricultural machine 1 is connected to the rear part of the tractor and the agricultural machine 1 is moved forward by the traveling of the tractor, the cultivating body 11 performs the cultivating work, and the ground leveling body 16 performs the grading work behind the cultivating body 11. .

  Here, for example, when the pressure of the air in the case (the mission case 4 and the chain case 8) in which the power transmission means 10 of the agricultural working machine 1 is disposed rises to a predetermined value or more, the elastic body 35 of the lubricating plug 31 is By being elastically deformed by being pressed by the air, the air discharge hole 33 is opened, a part of the air in the case escapes to the outside of the case, and the pressure in the case is reduced. For this reason, damage to the oil seal or the like in the case is prevented.

  When the pressure in the case is reduced and the elastic body 35 is restored to its original shape by the elastic restoring force, the air discharge hole 33 is closed by the elastic body 35. For this reason, for example, rain water does not enter the case through the air discharge hole 33 during rain, and cleaning water does not enter the case through the air discharge hole 33 during cleaning, for example.

  And according to such an oil plug 31, since it is provided in the groove 41 of the plug body 34 and includes the elastically deformable elastic body 35 that opens and closes the air discharge hole 33 that is a breather hole, It is possible to appropriately prevent oil leakage from the inside and rain water intrusion into the case.

  In addition, since the elastic body 35 is provided in the groove portion 41 communicating with the air discharge hole 33, the air discharge hole 33 can be appropriately closed by the elastic body 35, and infiltration of rainwater and the like can be more appropriately prevented. Can do.

  Further, since the elastic body 35 is detachable from the groove 41 of the plug body 34, for example, when it is necessary to replace the elastic body 35 due to deterioration over time, the old elastic body 35 can be easily replaced with a new one. Can be replaced.

  Further, by changing the elastic coefficient of the elastic body 35, the pressure of the air released from the case can be adjusted. That is, for example, by preparing a plurality of types of elastic bodies 35 having different elastic coefficients, selecting an elastic body 35 having an elastic coefficient corresponding to the air pressure to be released from the plurality of types of elastic bodies 35 and attaching it to the groove 41. , The pressure of air released from the case can be adjusted.

  Note that the oil plug 31 is not limited to the first embodiment shown in FIG. 3, and may be the second embodiment shown in FIG. 4, for example.

  That is, in the oil plug 31, the groove portion 41 of the plug body 34 is formed in a V-shaped cross section (including a substantially V shape), and the groove portion 41 does not have a groove bottom surface 41 a. For this reason, the air outlet portion 33b of the air discharge hole 33 is formed at the lower portion of both groove side surfaces 41b.

  Further, the oil plug 31 may be configured as in the third embodiment shown in FIG. 5, for example.

  That is, in the oil plug 31, a screw portion 46 is formed on the outer peripheral surface portion of the insertion portion 36 of the plug body 34. Therefore, the oil plug 31 can be screwed into the oil hole 30 formed into a screw hole.

  Further, the oil plug 31 may be configured as in the fourth embodiment shown in FIG. 6, for example.

  That is, in this oil plug 31, an oil detection rod 47 which is a rod-shaped oil amount confirmation means for confirming the amount of oil in the case is fixed to the plug body 34. For this reason, the amount of oil in the case can be easily confirmed by removing the oil plug 31 from the oil hole 30 of the case.

  In any of the embodiments, the elastic body 35 is not limited to a circular ring (O-shaped ring), and may be a rectangular ring (such as a □ -shaped ring or a D-shaped ring). It does not necessarily have to be annular.

  Further, the elastic body 35 may be, for example, one having a slit that is opened by elastic deformation, and the material of the elastic body 35 is arbitrary.

  In addition, the plug body 34 may be made of metal other than rubber or resin, and the plug body 34 is not limited to one in which the insertion portion 36 and the non-insertion portion 37 are integrated. The non-insertion portion 37 may be a separate body.

  Furthermore, the oil container that closes the oil hole 30 using the oil plug 31 is not limited to the cases 4 and 8 of the agricultural machine 1, and any oil container that has oil holes may be used.

  Although several embodiments of the present invention and modifications thereof have been described, the above-described embodiments and modifications can be appropriately combined without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Farm machine 4 Mission case which is a case as an oil container 8 Chain case which is a case as an oil container
10 Power transmission means
30 Lubrication hole
31 Oil plug
33 Air exhaust hole
34 Plug body
35 Elastic body
41 Groove
45 Annular elastic member

Claims (4)

An oil filler plug for closing the oil hole of the oil container,
A plug body having an air discharge hole for discharging air in the oil container;
An oil filler plug provided on the plug body and having an elastic body that opens and closes the air discharge hole. The plug body has a groove communicating with the air discharge hole,
The oil filler plug according to claim 1, wherein the elastic body is detachably provided in the groove portion of the plug body. The elastic body is composed of an annular elastic member that can be elastically deformed,
The annular elastic member closes the air discharge hole in a state before elastic deformation, and opens the air discharge hole in a state after elastic deformation based on the pressure of air in the oil container. Item 3. An oil filler plug according to item 1 or 2. The oil filler plug according to any one of claims 1 to 3, wherein the oil container is a case in which power transmission means of the agricultural machine is disposed.

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