JP4114359B2 - Engine pump gasket structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pump gasket structure for an engine, and more particularly to a pump gasket structure that can prevent the pump gasket from falling off when a pump is installed in a narrow space.
[0002]
[Prior art]
Conventionally, an engine is provided with various pumps. For example, an oil pump for lubricating the engine is provided.
The oil pump is fixed to an end face on the front side of the cylinder block of the engine via a pump gasket, and is configured to supply oil to each lubricating part of the engine. (For example, see JP-A-2-95787)
Incidentally, on the front surface of the cylinder block to which the oil pump is attached, an attachment portion for attaching a timing belt cover or a timing chain cover is formed on the outer peripheral side of the attachment portion for attaching the oil pump.
[0003]
[Problems to be solved by the invention]
However, when the space between the oil pump mounting portion and any one of the cover mounting portions is narrow, particularly the oil pump mounting portion is one of the cover mounting portions. In the case where the operator is positioned behind, there is a problem that the hand is difficult to enter and the pump gasket falls off during assembly work by the operator.
In other words, the operator tries to mount the pump on the oil pump mounting part of the cylinder block with the pump gasket fitted to the pump and holding the pump and the pump gasket by hand. If there is depth, the hand will not be fully inserted, so the gasket will be displaced or fallen off while the hand leaves the gasket.
Incidentally, as a measure for preventing the gasket from falling off, for example, JP-A-8-49898 discloses a measure for preventing the gasket interposed between the cylinder block and the cylinder head, and is provided on the cylinder block. By inserting a positioning pin insertion hole having a diameter larger than the diameter of the positioning pin into the gasket and inserting a part of the gasket into the insertion hole, the positioning pin and the gasket protrude. It is disclosed to engage the part to prevent the gasket from falling off.
However, in the above-described prior art, the diameter of the positioning pin insertion hole is set larger than the diameter of the positioning pin, and there is a concern that the positioning accuracy may deteriorate.
As another gasket dropout prevention measure, for example, Japanese Patent Laid-Open No. 9-32893 discloses a measure for preventing a gasket that is interposed between a chain tensioner and a cylinder head, and the chain tensioner is connected to the cylinder. It is disclosed that a part of a gasket protrudes into an insertion hole of a bolt for fixing to a head and the gasket is prevented from falling off by engaging the gasket with an inner wall surface of the insertion hole.
However, in the above-described prior art, since the gasket is prevented from falling off only by engaging the gasket, there is a concern that a sufficient holding force of the gasket cannot be secured. Therefore, it is necessary to increase the number of protrusions for preventing the above.
[0004]
The present invention has been made in consideration of the above problems, and its purpose is to reliably prevent the pump gasket from dropping while suppressing deterioration in positioning accuracy and an increase in the number of parts for preventing the pump gasket from falling off. It is an object of the present invention to provide an engine pump gasket structure.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides the following solution as a solution. That is, in the first configuration of the present invention, in the pump gasket structure of the engine interposed between the pump unit mounting portion formed in the engine body and the pump unit in which the pump is accommodated, the pump unit includes: A pump case that houses the pump and a pump case cover that covers the pump case, and the pump case and the pump case cover are attached to the pump unit mounting portion formed in the pump unit. while assembled via a positioning member for positioning when, in the pump gasket, engaging with, to the pump unit in the vicinity the positioning member insertion hole positioning member insertion hole which the positioning member is inserted is formed An engaging member is formed, and the engaging member is connected to the pump gasket. Of substantially perpendicular to the sealing surface extends toward the pump unit side from the pump unit attaching portion side, and is configured to include the pump unit and the abutment portion abutting on the tip. Usually, in order to improve positioning accuracy, the diameter of the positioning member insertion hole into which the positioning member is inserted is set to be substantially the same diameter as the positioning member. When the positioning member is inserted into the positioning insertion hole, the positioning member and the positioning insertion hole It is possible to hold the gasket to some extent by the resistance between. According to the first configuration of the present invention, since the engaging member is formed in the vicinity of the positioning member insertion hole, the holding of the gasket by inserting the positioning member into the positioning member insertion hole, and the gasket of the engaging member The gasket can be held in the pump unit by the cooperative action with the holding, and the pump gasket can be reliably prevented from falling off while suppressing an increase in the number of engaging members.
[0006]
Further, in the first configuration of the present invention, the pump unit includes a pump case that houses the pump and a pump case cover that covers the pump case, and the pump case and the pump case cover include It is configured to be assembled via a positioning member. When the pump unit includes a pump case and a pump cover, a positioning member is provided on either the pump case or the pump cover in order to perform positioning when assembling the pump unit and the pump cover. According to the 1st structure of this invention, a pump gasket can be hold | maintained using the positioning member used when a pump case and a pump cover are assembled.
[0007]
Further, in the second configuration of the present invention, the positioning member and the engaging member are respectively formed in the vicinity of both the suction port and the discharge port of the pump. According to the second configuration of the present invention, since the positioning member and the engaging member are formed in the vicinity of both the suction hole and the discharge hole of the pump that require the highest positioning accuracy, the positioning accuracy is ensured. it can be.
[0008]
【The invention's effect】
According to the present invention, it is possible to reliably prevent the pump gasket from dropping while suppressing deterioration in positioning accuracy and an increase in the number of members for preventing the pump gasket from falling off.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view of a cylinder block in a state where an oil pump unit 2 is attached to the front end of the cylinder block 1, and the cylinder block 1 is divided into an upper block 1a and a lower block 1b in the vertical direction. In the upper block 1a and the lower block 1b, an oil pump unit mounting portion 1c is formed across the blocks 1a and 1b.
A chain cover attaching portion 1d for attaching a chain cover (not shown) is formed at each peripheral edge of the upper block 1a and the lower block 1b. The chain cover attaching portion 1d is an oil pump unit attaching portion 1c. On the other hand, a predetermined length is extended on the front side of the engine. Therefore, the oil pump unit mounting portion 1c is located behind the chain cover mounting portion 1d.
An oil pump unit 2 is attached to the oil pump unit attachment portion 1c via a substantially L-shaped pump gasket 3 indicated by a dotted line.
Reference numeral 2a denotes a relief valve provided in the oil pump unit 2 for keeping the hydraulic pressure constant.
[0010]
2 is an oil pump unit configuration diagram showing the oil pump unit 2 as viewed from the rear side of the engine in FIG. 1 (the direction is opposite to that of FIG. 1), and FIG. 3 is a cross-sectional view taken along line AA in FIG. 4 is a view taken in the direction of arrow B in FIG. 1, and the oil pump unit 2 is composed of an oil pump case 2b and an oil pump cover 2c, and both members 2b and 2c are as shown in FIG. The positioning is performed by two positioning pins 2d.
As shown in FIG. 3, a gear type oil pump composed of an inner rotor 2e and an outer rotor 2f is housed in the oil pump cover 2c.
Also, in the oil pump unit 2, an intake port 2g for sucking oil into the oil pump (2e, 2f) and an oil for supplying oil from the oil pump (2e, 2f) to each lubricating part of the engine A discharge port 2h and a relief hole 2i for relieving excess oil after pressure regulation by the relief valve 2a to an upstream oil passage such as an oil pan (not shown) are formed.
[0011]
5 is an oil pump gasket configuration diagram showing the oil pump gasket 3 as viewed from the rear side of the engine in FIG. 1 (the direction is opposite to that in FIG. 1), and the oil pump gasket formed in a substantially L shape. 3, bolt insertion holes 3a to 3f into which bolts for mounting the oil pump unit 2 to the oil pump unit mounting portion 1c are inserted are formed. Among the bolt insertion holes 3a to 3f, 3c and 3e also serve as positioning pin insertion holes for inserting the positioning pins 2c (hereinafter, 3c and 3e are referred to as positioning pin insertion holes).
The diameters of the positioning pin insertion holes 3c and 3e are substantially the same as the outer diameter of the positioning pin 2d. When the positioning pin 2d is inserted into the positioning pin insertion holes 3c and 3e, the positioning pin insertion holes The oil pump gasket 3 is held in the oil pump unit 2 to some extent by the resistance between 3c and 3e and the positioning pin 2d.
Further, in the vicinity of the positioning pin insertion holes 3c and 3e, there are formed a discharge hole 2f formed in the oil pump unit 2 and a gasket discharge hole 3g and a gasket suction hole 3h respectively opposed to the suction hole 2d.
Reference numeral 3i denotes a guidette relief hole facing the relief hole 2h formed in the oil pump unit 2.
[0012]
Also, engaging members 3j and 3j having the same shape are formed in the vicinity of the positioning pin insertion holes 3c and 3e in the oil pump gasket 3, respectively.
6 is a view taken in the direction of arrows A and B in FIG. 5, FIG. 7 is a view taken in the direction of arrow C in FIG. 5, and FIG. 8 is a view taken in the direction of arrow D in FIG. Reference numeral 3j denotes a first extending portion 3k extending in the same direction as the seal surface from the end portion of the seal surface of the oil pump gasket 3 (portion indicated by a two-dot chain line in FIGS. 7 and 8), and the first extending portion 3k. The width of the oil pump unit 2 is perpendicular to the sealing surface of the oil pump gasket 3 from the end of the oil pump unit 2 toward the oil pump unit 2 side from the oil pump unit mounting portion 1c side (in the L shown in FIGS. 3 and 4). A second extending portion 3l extending substantially the same width as the corresponding portion), and a contact portion 3m extending again from the end of the second extending portion 3l toward the seal surface of the oil pump gasket 3. It is composed of
The engaging member 3j is bent by, for example, press molding, and the oil pump gasket 3, the first extending portion 3k, and the second extending portion 3l are thinned (3n) and bent. Improves sex.
When the oil pump unit 2 is attached to the oil pump attachment portion 1c via the oil pump gasket 3, the positioning pin 2d of the oil pump unit 2 is inserted into the positioning pin insertion holes 3c and 3e of the oil pump gasket 3 so that the oil When the pump gasket 3 is attached to the oil pump unit 2, the engagement members 3j and 3j have a width L of the oil pump unit 2 within the width of the second extending portion 3l, as shown by a two-dot chain line in FIG. The abutting portion 3m abuts against the anti-seal surface 2k opposite to the seal surface 2j of the oil pump unit 2 so that the oil pump gasket 3 is held by the oil pump unit 2.
[0013]
As described above, according to the present embodiment, since the engaging members 3j, 3j are formed in the vicinity of the positioning pin insertion holes 3c, 3e of the oil pump gasket 3, the positioning pin insertion holes 3c, When the positioning pin 2d is inserted into the assembly 3e and assembled, the oil pump gasket 3 is held by the insertion of the positioning pin 2d into the positioning pin insertion holes 3c and 3e, and the engaging members 3j and 3j are engaged with the oil pump unit 2. The oil pump gasket 3 is held in the oil pump unit 2 with a sufficient holding force by the cooperative action with the holding of the oil pump gasket 3 by combining.
Therefore, when the oil pump unit 2 is attached to the cylinder block 1, even if the space is small and the operator cannot grip the oil pump gasket 3, it is possible to reliably prevent the oil pump gasket 3 from falling off.
Moreover, since the positioning pin 2d is used to hold the oil pump gasket 3, an increase in the number of the engaging members 3j can be suppressed.
Further, the oil pump unit 2 is divided into an oil pump case 2b and an oil pump cover 2c, and a positioning pin used when assembling both members can be used.
[0014]
In the present embodiment, the example in which the engaging member 3j is constituted by the first extending portion 3k, the second extending portion 3l, and the abutting portion 3m is shown, but as shown by a two-dot chain line in FIG. In addition, the contact portion 3m is abolished, the second extension portion (contact portion) 3m ′ is bent at an acute angle, and the oil pump gasket 3 is pumped by the spring force of the second extension portion (contact portion) 3m ′. You may make it hold | maintain at the unit 2. FIG.
Moreover, although the example which applies the gasket of this embodiment to an oil pump was shown in this embodiment, you may make it apply to another water pump.
[Brief description of the drawings]
FIG. 1 is a front view of a cylinder block according to the present embodiment.
FIG. 2 is a configuration diagram of an oil pump unit according to the present embodiment.
3 is a cross-sectional view taken along line AA in FIG.
4 is a view taken in the direction of arrow B in FIG. 1;
FIG. 5 is a configuration diagram of an oil pump gasket according to the present embodiment.
6 is a view as viewed from an arrow A and a view as viewed from an arrow B in FIG. 5;
7 is a view taken in the direction of arrow C in FIG.
FIG. 8 is a view taken in the direction of arrow D in FIG.
FIG. 9 is a view showing a modification of the oil pump gasket engaging member.
[Explanation of symbols]
1: Cylinder block (engine body)
1c: Oil pump unit mounting part (pump unit mounting part)
2: Oil pump unit (pump unit)
2b: Oil pump case (pump case)
2c: Oil pump case cover (pump case cover)
2d: Positioning pin (positioning member)
2g: suction hole 2h: discharge hole 3: oil pump gasket 3c, 3e: positioning pin insertion hole (positioning member insertion hole)
3j: engaging member 3k: first extending portion 3l: second extending portion 3m: contact portion

Claims (2)

In the pump gasket structure of the engine interposed between the pump unit mounting portion formed in the engine body and the pump unit in which the pump is accommodated,
The pump unit includes a pump case that houses the pump and a pump case cover that covers the pump case, and the pump case and the pump case cover are formed in the pump unit. While assembled through a positioning member for positioning when mounting to the unit mounting portion,
A positioning member insertion hole into which the positioning member is inserted is formed in the pump gasket, and an engaging member that engages with the pump unit is formed in the vicinity of the positioning member insertion hole. The pump unit extends from the pump unit mounting part side toward the pump unit side substantially perpendicular to the seal surface of the pump gasket, and has a contact part that contacts the pump unit at the tip. An engine pump gasket structure. 2. The engine pump gasket structure according to claim 1, wherein the positioning member and the engaging member are respectively formed in the vicinity of both the suction port and the discharge port of the pump .

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