JP4351747B2 - Engine oil drain plug - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an oil drain plug used for an oil pan of an automobile engine.
[0002]
[Prior art]
Conventionally, in an automobile engine, a mechanism for circulating lubricating oil (oil) to a predetermined part is provided in order to smoothly move an operating part, but this oil deteriorates with use and has a desired lubricating performance. Cannot be obtained, and wear powder and sludge are mixed in the oil. For this reason, the stale oil is exchanged every certain period (generally every traveling of a constant distance of about 3000 to 5000 km) from the viewpoint of preventing damage to the engine body.
[0003]
FIG. 5 is a view for explaining an example of a conventional general engine having a structure for replacing the old oil. The oil 100 of the oil pan 102 provided in the lower part of the crank chamber is an oil Oil is supplied to a predetermined portion by the pump 101. Oil is pumped by the pump 101 and regulated by the regulating valve 103, and then foreign matter such as metal powder, carbon and sludge mixed in the oil is removed and cleaned by the filter 104. It is provided so as to return to the oil pan 102. Note that the oil pan 102 is usually configured to always be filled with oil.
[0004]
In this way, the oil is usually subjected to a cleaning process in which the contaminants are removed by the filter 104 during its circulation. However, not only is there a limit to the removal of foreign matter by the filter, but the problem is that the oil itself deteriorates over time. Inevitable. Therefore, a plug (drain cock) 106 is removed from a normally closed oil drain hole (drain hole) 105 provided at the bottom of the oil pan 102, and old oil is drained by natural flow. Oil replacement is performed by closing the hole 105 and pouring new oil from above.
[0005]
However, the oil changing operation described above is a troublesome operation in which the plug is removed from the oil drain hole 105 at the beginning of the operation, and the plug is screwed after the oil is removed, and it is inevitable that the operator is covered with oil.
[0006]
Therefore, an operation of extracting oil from the upper side of the engine is also performed. For example, a method in which a long suction tube is inserted into the oil gauge mounting hole provided to check the oil level and dirt of the engine, and old oil is vacuumed, or a suction tube is inserted from the oil inlet (hereinafter referred to as the suction tube). These are referred to as “upper method”).
[0007]
However, these topping methods insert the tube from the top of the crankshaft and other complicated mechanisms that are compactly housed in a narrow space, so that the tube tip reaches the bottom of the oil pan. It is difficult to extract all of the old oil, and it is difficult to extract the old oil by checking the oil after adding the new oil. In extreme cases, it is necessary to change the oil again. May cause problems. In addition, there is a problem that it is difficult to remove metal powder or the like deposited on the bottom of the oil pan, and it is not always popular.
[0008]
On the other hand, the method of pulling out old oil is capable of extracting the entire amount of oil, and therefore a method has been proposed that eliminates the difficulty of getting dirty with oil while taking advantage of the advantages. For example, an oil changing method using a permanent fixing plug (plug) with a built-in normally closed poppet valve (US Pat. No. 4,745,894 (corresponding Japanese Patent Publication No. 4-48987)), with a normally closed ball valve built in For example, an oil changing method using a permanent fixing plug (plug) (Japanese Patent Laid-Open No. 8-170782).
[0009]
In these methods, the oil drain hole blocking plug 106 having the existing simple plug structure shown in FIG. 5 is removed, and a valve plug (not shown) having a normally closed valve is replaced with the oil drain hole 105 instead. When exchanging oil, a dedicated jig for opening the built-in valve is attached to suck the oil 100 in the oil pan 102 under negative pressure. Return the valve to the closed position and fill with fresh oil.
[0010]
According to this method, the oil 100 can be forcibly extracted with the suction device, so that the operation can be performed quickly, and the plug removal and re-screwing operations are performed next time, apart from the first plug replacement. In addition, it is possible to obtain an excellent advantage that the operator and the surroundings can be worked without being contaminated with oil.
[0011]
[Problems to be solved by the invention]
However, when the present inventor performed actual work using the above-mentioned conventionally proposed plug with a normally closed valve, there were some problems such as inability to install the plug in some vehicles, It became clear that the possible car models are limited.
[0012]
As a result of further investigations, it was found that these problems were affected by subtle misalignment of various mechanisms in the oil pan, which did not require strict installation position accuracy and different design specifications depending on the vehicle type. .
[0013]
That is, in the normally closed valve built-in type plug disclosed in the above-mentioned Japanese Patent Application Laid-Open No. Hei 8-170782, the oil flows from the periphery of the cylindrical portion housing the ball valve constituting the normally closed valve. The ball valve and the spring housing that normally closes the ball valve are mounted on the oil pan in a form that protrudes into the oil pan for a certain length, but if there is a structure on the axis of the oil drain hole in the oil pan, The plug cannot be screwed in sufficiently, resulting in poor mounting. Such structures include baffle plates, separators, and oil pumping strainers that suppress oil undulations when the vehicle is running. There are some types of vehicles that cannot be installed at all in the design specifications, and there are no problems with the design specifications. However, there may be a case where it cannot be mounted due to a displacement of a mounting position of only a few mm at the time of manufacture.
[0014]
Further, in the case of the normally closed valve built-in type plug disclosed in US Pat. No. 4,745,894, the plug attached to the oil pan in the normally closed state is substantially flush with the bottom surface of the oil pan. There is no problem that it cannot be mounted even if there is a structure on the axis of the oil drain hole as described above. However, this type of plug, when oil is drained, moves the valve body located at the end inside the oil pan of the plug in the direction of the oil pan to separate the engagement with the valve seat. Therefore, if a structure such as that described above is present, the valve cannot be opened even if the plug can be attached. Therefore, in this case, it will be understood for the first time that the plug cannot be opened for the first time when the oil is drained. Rather, the actual adverse effect is greater than in the above case.
[0015]
The present invention eliminates the need for removing the plug as described above, and the normally closed valve built-in type plug having the advantage of being able to work quickly without being contaminated with oil by the vehicle type or the mechanism within the oil pan. To provide an engine oil drain plug that is a new normally closed valve built-in plug that has been devised so that it can be universally applied to all vehicles without being affected by the slight displacement of the mounting position. It was made as a purpose.
[0016]
Another object of the present invention is to provide an oil draining plug that can reduce the length of the oil pan projecting downward from the bottom of the oil pan and reduce the risk of the plug being damaged by so-called bottom rubbing of the vehicle. By the way.
[0017]
Still another object of the present invention is to provide a plug for draining oil that has a simple structure, can be easily assembled, is excellent in mass productivity, and is inexpensive.
[0018]
[Means for Solving the Problems]
The above object is achieved by the oil draining plug of the present invention having the structure described in each claim of the present application.
[0019]
According to the first aspect of the present invention, an oil drain plug for an engine is provided with a screw shaft portion at one end formed with a male screw to be screwed and fixed to an oil drain hole provided in an oil pan of an engine device, Bolt head type head on the other end side located outside the oil pan in the fixed state, and penetratingly formed to drain the oil from the screw shaft portion on the one end side to the head on the other end side. An oil drain passage in the axial direction and provided near the head in the oil drain passage Separately with tapered surface as sealing surface A cylindrical bolt-shaped member having an annular valve seat, and an oil drain passage of the bolt-shaped member. A cylindrical portion that slides and is guided to move in the axial direction by a cylindrical inner wall surface provided on the one end side, and a plurality of oil circulation holes provided continuously to the cylindrical portion, the inside of which forms an oil drain passage And further provided in the oil circulation hole The oil drain passage is closed by engaging the valve seat. The sealing surface with the valve seat is formed on the outer diameter portion of the cylindrical portion. Having a valve body and moving the valve body from the valve seat toward the inside of the oil pan. Above A movable valve body member movably installed in the oil drain passage so as to open the oil drain passage;
In the oil drain passage of the bolt type member, Seat When Above Of the movable valve element The tip of the tube Stretched between, Above The valve element is attached to the movable valve element. Above A spring member for normally closing a valve that biases a spring force in a direction to be engaged with the valve seat, and the movable valve body member is moved against the spring force of the valve normally closing spring member. That Valve body Above An oil draining plug that is used to open the oil drain passage by being separated from the valve seat to drain the oil, and the tip of the screw shaft portion is fixed when the screw is fixed. Above The oil pan is provided so as to be substantially flush with the inner wall surface of the oil pan.
[0020]
In the above-described configuration, a configuration capable of strictly ensuring a liquid-tight seal for preventing oil leakage is preferably employed for the engagement surface between the valve body portion and the valve seat of the movable valve body member, for example, oil resistance and weather resistance. It is preferable to interpose a highly durable seal ring. Generally, this seal ring is assembled to the valve body portion of the movable valve body member.
[0021]
Further, it is preferable to provide a movable valve body member movement guide that stabilizes the movement of the movable valve body member and ensures a reliable sealing state. For example, the movable valve body member has a cylindrical shape integrated with the valve body portion. It is recommended to adopt a configuration in which a guide portion is provided for providing a guide portion for moving and guiding the cylindrical portion in the axial direction on the inner wall of the bolt-type member.
[0022]
Further, in the above configuration, “making the tip of the screw shaft portion approximately flush with the inner wall surface of the oil pan” does not mean that it is strictly flush with the above-described conventional method. It is only necessary to avoid the problem that the structure inside the oil pan has a problem that hinders plug mounting and valve opening, so that it protrudes slightly inward from the inner wall surface of the oil pan within such a range. This does not exclude cases where dimensions are provided.
[0023]
According to the present invention, the plug of the present invention with a normally closed valve is used without any particular problem as a simple plug that is used to be removed from the oil pan and remounted after oil is removed when the oil is changed. It can be mounted on all types of vehicles just as well, and the normally closed valve is opened by moving the movable valve body member in the plug, so it exists in the oil pan. It can be secured without being affected by the structure. Therefore, the problem of the present invention of solving the problem that the type of vehicle that can be mounted by the conventional closed-valve built-in plug is limited to the vehicle type, and being always applicable appropriately to all vehicles can be achieved. .
[0024]
According to a second aspect of the present invention, there is provided an assembly holding portion for a jig in which the head of the bolt-shaped member moves the movable valve body member against the spring force to hold the oil drain passage in the open state. It is characterized by having.
[0025]
According to the present invention, since the open circuit of the built-in normally closed valve can be maintained by assembling the jig, the burden on the operator is reduced, and particularly the work of the method of forcibly extracting oil with a negative pressure suction device is simplified. It can be carried out.
[0026]
The invention of claim 3 is that in each of the above inventions, the annular valve seat provided in the vicinity of the head in the oil drain passage of the bolt type member is a valve seat forming member separate from the bolt type member. The bolt-type member is fixed by caulking at the end of the bolt-shaped member.
[0027]
According to the present invention, the valve seat, which is an important member for reliably preventing oil leakage when the built-in normally closed valve is closed, is a member that is designed independently and separately from the bolt-type member in terms of material, shape, etc. There is an advantage that can be formed.
[0028]
The invention of claim 4 is the above invention, Above Bolt type members Above From one end to the other end inside the oil pan, Above Spring member accommodating portion for normally closing the movable valve body member And said An accommodating portion of the cylindrical portion of the movable valve body member; The An accommodating portion of the movable valve body member; Above The fixed portion of the valve seat forming member is provided so as to gradually increase in diameter.
[0029]
According to the present invention, a built-in valve normally closed spring, a movable valve body member, and a valve seat forming member are housed in the oil drain passage of the bolt type member in this order, and the other end of the bolt type member is connected to the valve seat. Since the plug of the present invention can be manufactured by caulking so as to fix the forming member, the manufacturing work of the oil draining plug can be extremely simplified, and there is an advantage that an inexpensive product with excellent productivity can be provided. It is done.
[0030]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in more detail based on embodiments shown in the drawings.
[0031]
Embodiment 1
This example is shown in FIGS. 1 to 4, and FIG. 1 shows a state in which the oil draining plug of this example is attached to the oil pan and the oil draining jig is assembled to drain the oil. FIG. 3 is a view for explaining the oil draining plug of this example, and FIG. 3 shows a dedicated jig for opening the normally closed valve of the oil draining plug of this example. FIG. 4 shows a cap that is used to protect the oil draining plug at times other than during oil replacement.
[0032]
In FIG. 1, reference numeral 102 denotes an oil pan, and 105 denotes an oil drain hole (female screw hole) provided at the bottom of the oil pan 102. These are the same as those in FIG. The oil drain hole 105 is normally closed by a simple plug (see reference numeral 106 in FIG. 5) that does not contain a normally closed valve. When the oil drain plug 1 of this example is used, Then, the closing plug 106 is removed and an oil draining plug 1 described below is screwed and fixed. Reference numeral 2 denotes oil stored in the oil pan 102.
[0033]
Details of the oil draining plug 1 of this example are shown in FIGS. The oil draining plug 1 of this example includes a screw shaft portion 111 on one end side where a male screw 1111 is formed, and a head portion 112 that is continuous with the screw shaft portion 111 and that has a large diameter on the other end side. And a bolt-type member 11 provided with a through-hole 113 having a step (a step with a large diameter on the bolt head side) from the screw shaft portion 111 to the head 112, and the head in the through-hole 113. The valve seat forming member 12 fixed in the vicinity of the opening on the 112 side and the valve seat 121 formed on the valve seat forming member 12 are incorporated in the through hole 113 so as to constitute an on-off valve. The movable valve body member 13 and a coil spring 14 that biases the movable valve body member 13 toward the valve seat 121 are configured. The through hole 113 forms an oil drain passage.
[0034]
The above-described members constituting the oil draining plug will be described. The bolt-type member 11 has the above-described screw shaft portion 111 and the head portion 112 as shown in FIG. The following structure is formed in the through-hole 113 formed in the axial direction so as to extend from one end portion on the screw shaft portion 111 side to the other end portion on the head portion 112 side. That is, a receiving seat 1131 at the end of the coil spring 14 provided as an inward short flange in the vicinity of the screw shaft portion 111 side, and extends to a substantially intermediate position in the axial direction of the bolt-type member 11 following the spring receiving seat 1131. The cylindrical inner wall surface 1132 that forms the accommodating portion of the coil spring 14 and that the movable valve body member 13 slides and guides the movement in the axial direction, is connected to the cylindrical inner wall surface 1132 through the tapered portion 1133. A large-diameter cylindrical surface 1134 extending in the direction of the head 112, and a valve seat forming member 12 provided in the vicinity of the head 112 via a seal ring assembly step 1135 following the large-diameter cylindrical surface 1134. A caulking fixing taper portion 1136 and a valve seat forming member caulking fixing projection 1137 formed on the head portion 112 are sequentially formed.
[0035]
The axial dimension of the screw shaft portion 111 is determined when the oil drain hole (female screw hole) 105 of the oil pan 102 is screwed and fixed to the shoulder portion 1121 of the head portion 112 with the packing 3 interposed therebetween. The tip is set to a dimension that is substantially flush with the bottom surface of the oil pan 102. Further, the outer periphery of the head 112 of the plug 1 is fixedly held when an oil draining jig to be described later is mounted, and the protective cap 4 to be described later is also fixedly held in normal times. A circumferential groove 1122 to be used is provided. In this circumferential groove 1122, a guide surface 1123 having a circular cross section for assembling the dedicated jig and the protective cap 4, and a shoulder portion 1121 of the head from the screw shaft portion 111. Subsequently, a hexagonal bolt head 1124 for plug screwing is provided.
[0036]
Next, the valve seat forming member 12 in the above configuration will be described. The details are shown in FIGS. 2 (a) and 2 (c). That is, it has a cylindrical (ring-shaped) structure having a relatively short dimension in the axial direction, and the outer peripheral side thereof is located near the end on the head 112 side, and the bolt A taper outer peripheral surface 122 that coincides with the caulking fixing taper portion 1136 of the mold member 11 is formed, and subsequently, the seal ring assembly step portion 123 that forms a pair with the seal ring assembly step portion 1135, and the large diameter The outer peripheral surface 124 extended in the axial direction which fits the cylindrical surface 1134 is provided. Further, as the shape on the inner peripheral side, the cylindrical inner peripheral surface 125 is located on the end side of the head portion 112 so as to form a passage for oil drainage, and subsequently, reaches the outer peripheral surface 124. A tapered surface is provided to gradually increase the passage diameter. The valve seat 121 is formed by a tapered surface that gradually increases the diameter of the passage.
[0037]
The valve seat forming member 12 is assembled from the head 112 side of the bolt-type member 11 so that the tapered outer peripheral surface 122 engages with the caulking fixing taper portion 1136, and then the valve seat forming member caulking fixing The protrusion 1137 is fixed to the bolt-type member 11 by crimping.
[0038]
Next, the movable valve body member 13 in the above configuration will be described. This is shown in FIGS. 2 (a) and 2 (b). That is, the movable valve body member 13 of this example includes a cylinder part 131 forming an oil drain passage formed as an end part on the screw shaft part 111 side, and a valve body formed as an end part on the head part 112 side. The cylindrical portion 131 is provided with three oil distribution holes 1311 communicating with the inside and outside of the cylinder portion 131, which are evenly distributed in the circumferential direction and are appropriately sized to drain oil. . The cylindrical portion 131 has an outer diameter dimension that allows sliding so that the cylindrical inner wall surface 1132 of the bolt-shaped member 11 is moved and guided in the axial direction.
[0039]
In addition, in the present example, the valve body portion 132 is provided in a reverse truncated trapezoidal shape in the state of FIG. 2A, and a circumferential groove 1321 is formed on the outer peripheral surface of the taper. The circumferential ring 1321 is assembled with a seal ring 6 that can exhibit a reliable liquid-tight seal when seated on the valve seat 121.
[0040]
The assembly of the oil draining plug 1 of this example having the above configuration and the assembly and fixing to the oil pan 102 will be described.
[0041]
First, the coil spring 14 is first applied from the large opening on the head side along the cylindrical inner wall surface 1132 to the spring seat 1131 on the bolt-type member 11 with the protrusion 1137 not crimped. Next, the movable valve body member 13 to which the seal ring 6 is assembled is inserted so that the tip of the cylindrical portion 131 is engaged with the end of the coil spring 14, and the coil spring 14 is inserted. Hold in a compressed state.
[0042]
Next, after the seal ring 5 is assembled in the step portion 1135 that is the assembly portion, the valve seat forming member 12 is fitted and inserted so that the tapered outer peripheral surface 122 engages with the tapered portion 1136 of the through hole 113, The projection 1137 is caulked to fix the valve seat forming member 12, the holding of the movable valve body member 13 is released, and the assembling operation is completed.
[0043]
As described above, the assembly of the oil draining plug 1 of this example can be performed very easily, is excellent in mass productivity, and has a small number of parts, so that the product can be supplied to the market at a low price. Further, since the valve seat forming member 12 can be centered by the engagement of the tapered portion with the bolt type member 11, it can be positioned with high accuracy, oil leakage can be prevented by the seal ring 5, and the seal of the movable valve body member 13 can be achieved. Ring 6 and valve seat 121 of It is possible to provide a reliable plug without oil leakage that can prevent oil leakage by reliable engagement.
[0044]
In the plug 1 of this example manufactured in this way, the existing simple plug 106 (see FIG. 5) assembled in the oil drain hole 105 of the oil pan 102 is removed, and then the packing 3 is interposed between the screw 1 and the screw 1. The shaft 111 can be assembled and fixed to the oil pan 102 by screwing the shaft 111 into the oil drain hole 105. At this time, a hexagonal bolt head 1124 provided on the head 112 of the bolt-type member 11 is Used for screwing work using a screwing jig such as a spanner.
[0045]
With respect to the plug 1 assembled and fixed as described above, the protective cap 4 shown in FIG. Fitted. The protective cap 4 of this example is formed on a part of the body inner wall 42 of the body 41 having a circular cross section that fits the guide surface 1123 having a circular cross section of the bolt type member head 12. It is formed as a rubber cap configured to have a circumferential projection 43 that fits into the groove 1122, The head 112 of the bolt-shaped member 11 The material and the structure are not limited as long as they can be securely assembled and held at the end of the material.
[0046]
Next, a preferable oil draining operation from the oil pan 102 to which the oil draining plug 1 of this example is assembled and fixed as described above will be described.
[0047]
This preferable operation is performed using the oil draining exclusive jig 7 shown in FIG. 3, and the state during the oil draining operation is shown in FIG.
[0048]
The dedicated oil draining jig 7 used in this example is a coupling that turns on and off fluid flow by attaching and detaching a general socket and plug, that is, a normally closed valve is built in either the socket or the plug. When the socket and the plug are detached, the normally closed valve is closed. When the socket and the plug are fitted and attached, the normally closed valve is opened to allow the fluid to flow.
[0049]
That is, the exclusive oil draining jig 7 used as a socket constituting a coupling paired with the plug 1 of this example has a circular cross section so that it can be fitted on the guide surface 1123 of the head 112 of the plug 1. It has a large-diameter plug fitting portion 71 having an inner wall surface 711 and a coupler connecting portion 72 on the other end side for connecting the oil suction hose 8. An axial through hole extending over the coupler connecting portion 72 is formed as an oil drain passage 73.
[0050]
The plug fitting portion 71 accommodates toward the radially outer side so as to restrict the protrusion of the ball over a certain length radially inward and allow the ball to move freely outward. A plurality of ball receiving holes 712 having a gradually increasing diameter and a plurality of balls 713 received in the ball receiving holes 712 are arranged uniformly in the circumferential direction, and the movement of the balls radially outward is performed in two stages. An attachment / detachment switching mechanism is provided in which an annular cylindrical ball movement restricting slider 714 for restricting the position is assembled. The ball movement restricting slider 714 is pressed toward one end by a coil spring 715 externally provided on the outer periphery of the plug fitting portion 71 and is prevented from coming off by a locking ring 716. In this state, the inner periphery of the slider 714 The surface 7141 restrains the ball 713 at a position projecting radially inward. When the slider 714 is moved to the other end side against the spring force of the coil spring 715, the ball 713 can be moved radially outward by the tapered surface 7142 at the tip. Note that the tip protrusion 7143 of the slider 714 is used to prevent the ball 713 from coming off.
[0051]
Further, a pressing rod 717 for moving the movable valve body member 13 that opens the normally closed valve built in the plug when the dedicated jig 7 is attached to the plug 1 is provided at the bottom of the inner cylinder of the plug fitting portion 71. . The pressing rod 717 is provided so as to extend a certain length from the center of the bottom portion 718 of the plug fitting portion 71 in which a plurality of axial oil drain passages are formed, toward the one end portion side. The extension length is set so that the moving length of the movable valve body member 13 when the dedicated jig 7 is attached to the plug 1 is appropriate. Reference numeral 719 denotes a seal member for preventing oil leakage when the dedicated jig 7 is attached to the plug 1. The seal member 719 is assembled to the bottom of the inner cylinder of the plug fitting portion 71 to form a valve seat for the plug at the time of attachment. It is adapted to be elastically attached to the end face of the member 12.
[0052]
Note that one end of a hose is fixed to the coupler 9 fitted to the coupler connecting portion 72, and the other end of the hose 8 is connected to a negative pressure suction device (not shown).
[0053]
The state in which the protective cap 4 of the plug 1 of the present example, in which the dedicated oil draining jig 7 configured as described above is assembled and fixed to the oil pan 102 is removed and assembled, is shown in FIG. By fitting the jig 7, the pressing rod 717 pushes and moves the movable valve body member 13 of the plug 1 to separate the valve body 132 from the valve seat 121 to open the normally closed valve, and the seal member 719 opens the valve. Engage with the end face of the seat forming member 12 to achieve a fluid tight seal. Therefore, the oil in the oil pan 102 can be forcibly drawn out by the negative pressure action from the negative pressure suction device (not shown) through the hose 8.
[0054]
At this time, since there is nothing protruding from the one end side of the plug 1 into the oil pan 102, the normally closed valve can be opened and closed smoothly without any restriction on the mechanism and structure in the oil pan.
[0055]
【The invention's effect】
As described above, according to the present invention, there is no need to remove the plug, the operator is hardly contaminated with oil, and the normally closed valve built-in plug having the advantage of being able to work quickly can be The effect of being able to be universally applicable to all vehicles with a plug with a normally closed valve of the same standard without being affected by slight displacement of the oil pan internal mechanism is obtained for the first time. It is done.
[0056]
Further, the oil draining plug of the present invention has a dimension necessary to ensure the moving length of the movable valve body member suitable for opening the built-in normally closed valve, and the screw shaft portion is a housing portion for the valve body pressing spring. Therefore, the total length of the plug can be shortened compared to the conventional type described above. For example, by reducing the length protruding downward from the bottom of the oil pan, the plug can be used for rubbing the bottom of the vehicle. The effect that can reduce the fear of damage is obtained.
[0057]
Furthermore, the oil draining plug of the present invention has a simple structure, can be easily assembled, and is excellent in mass productivity, so that the oil draining plug can be provided at low cost. The
[0058]
Furthermore, in the type in which the oil drain plug of the present invention is attached to the bottom surface of the oil pan, the end portion inside the oil pan can be flush with the bottom surface of the oil pan, so that there is substantially no residual drain or extremely There is also an effect that a small number of states can be secured.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a state in which an oil draining plug according to Embodiment 1 of the present invention is installed in an oil draining hole of an oil pan and an oil draining jig is assembled to drain the oil.
2A and 2B are views for explaining the oil draining plug according to the first embodiment, wherein FIG. 2A is a longitudinal sectional view thereof, FIG. 2B is a perspective view of the movable valve body member, and FIG. 2C is a valve seat; The perspective view of a formation member.
3 is a longitudinal sectional view showing a dedicated jig for opening a built-in normally closed valve of the oil draining plug according to Embodiment 1. FIG.
FIG. 4 is a longitudinal sectional view showing a cap used for protecting the oil draining plug of the first embodiment at a normal time other than during oil replacement.
FIG. 5 is a view showing an example of a conventional method for extracting oil from an oil pan of an engine to which the plug of the present invention is applied.
[Explanation of symbols]
1 ... Plug for oil removal
2 ... oil
3 ... Packing
4 ... Protective cap
5 ... Seal ring
6 ... Seal ring
7 ... Exclusive jig for oil extraction
71 ... Plug fitting part
711 ... Inner wall surface
712 ... Ball housing oil hole
713 ... Ball
714 ... Ball movement restriction slider
7141 ... inner peripheral surface
7142 ... Tapered surface
7143 ... tip protrusion
715 ... Coil spring
716 ... Locking ring
717 ... pressing rod
718 ... Bottom
719 ... Seal member
72 ... Coupler connection
8 ... Hose
9 ... Coupler
11 ... Bolt type member
111 ... Screw shaft
111 ... Male thread
112 ... head
1121 ... shoulder
1122 ... Circumferential groove
1123 ... Guide surface
1124 ... Hexagon bolt head
113 ... through hole
1131 ... (spring) seat
1132 ... cylindrical inner wall surface
1133. Tapered portion
1134: Large diameter cylindrical surface
1135 ... Stepped part
1136.. Tapered portion
1137... Projection
12 ... Valve seat forming member
121 ... Valve seat
122 ... Tapered outer peripheral surface
123 ... Step
124 ... outer peripheral surface
13 ... movable valve element
131 ... Cylinder part
1311 ... Oil circulation hole
132 ... Valve body
1321 ... Circumferential groove

Claims (4)

A screw shaft portion on one end side formed with a male screw that is screwed and fixed in an oil drain hole provided in an oil pan of the engine device, and the other end side that is located outside the oil pan when the screw is fixed. A bolt head type head, an axial oil drain passage formed through the drain shaft from the screw shaft portion on the one end side to the head on the other end side, and the oil drain passage in the oil drain passage. A cylindrical bolt-shaped member having a separate annular valve seat having a taper surface provided in the vicinity of the head as a seal surface ;
The cylinder part slides so as to be moved and guided in the axial direction by a cylindrical inner wall surface provided on the one end side of the oil drain passage of the bolt type member, and the inside continues to the cylinder part forming the oil drain passage. The oil drainage passage is closed by engaging with a plurality of oil circulation holes provided in addition to the valve seat provided subsequent to the oil circulation holes, and the seal surface with the valve seat is outside the cylindrical portion. It has a valve body portion which is formed in diameter, and movably decorated in the oil drain passage to the valve body opens the oil drain passage by moving from the valve seat toward the inside of the oil pan Movable valve body member,
Is stretched between the tip of the cylindrical portion of seat and the movable valve member of said one end vicinity in the oil drain passage of said bolt-type member, the valve body portion to the movable valve member on the valve seat A spring member for normally closing a valve for biasing a spring force in a direction to be engaged,
Oil used as the movable valve member to open the oil drain passage by separating the the valve body from the valve seat is moved against the spring force of the valve normally closing spring members pull the oil A plug for unplugging,
Tip of the screw shank, oil drain plug of the engine, characterized in that provided so that the the inner wall surface of the oil pan generally flush when the screwing fixing. In claim 1, the head of the bolt-type member having a holding portion assembling jig for holding the oil drain passage said movable valve member is moved against the spring force to open circuit An oil drain plug for the engine. According to claim 1 or 2, an annular valve seat provided in the head near in the oil drain passage of said bolt-type member, a valve seat-forming member of the further body, fixed with caulking of the bolt-type member end An oil drain plug for an engine characterized by being formed as a In any one of claims 1 to 3, the bolt-type member, from said oil pan inner end portion toward the other end, the valve of the movable valve member normally closing spring member accommodating portion and the movable valve receiving portion of the cylindrical portion of the body member, housing portion of said movable valve body member, the fixing portion of the valve seat-forming member, gradually oil drain plug of the engine, characterized in that provided such that the diameter .

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