JP2006316680A - Sealing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an easy assembling sealing structure opening on an assembly mating surface of a first component and a second component assembled with fitting each other, and capable of making communication among a plurality of openings of fluid passages under sealing the same well. <P>SOLUTION: This sealing structure is provided with a crank case 16 and a balancer housing 60 assembled with fitting each other, an oil passage 61 and an oil supply passage 62, the oil passage 61 and an oil discharge passage 63 formed on the crank case 16 and the balancer housing 60 respectively and opening on the assembly mating surface and communicating each other, a plurality of annular elastic seal parts 46, 46 arranged in an opening communication section of the assembly mating surface, and a connection base plate 48 connecting and retaining each annular elastic seal part 46, 46. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a seal structure including seal portions corresponding to a plurality of fluid passages formed on an assembly surface of components that are fitted and assembled to each other.

Conventionally, when fluid passages for supplying lubricating oil or the like are communicated with an assembly consisting of a plurality of components such as an engine, a sheet-like packing is provided on an assembly surface where the fluid passages are opened. A sealing member such as an O-ring is provided to prevent liquid leakage.
By the way, assembling surfaces of various component parts include an inlay structure in which a convex part formed in one component part and a concave part formed in the other component part are fitted to each other.

When the components having such an inlay structure are fitted together and assembled, the tolerance of the assembly surface cannot absorb the dimensional variation of the sheet-like packing.
In general, an O-ring 101 as shown in 0 is used.
As shown in FIG. 10, the first part 102 on which the convex portion 103 is formed has an assembly surface 1.
An oil supply path 105 that opens to 02a is formed, and the assembly surface 102a has O
A seal housing portion 107 for positioning and holding the ring 101 is recessed.
An oil supply path 115 that opens to the assembly surface 112a is formed in the second component 112 in which the concave portion 110 is formed.

Therefore, in a state where the O-ring 101 is positioned and held in the seal housing portion 107, the convex portion 10
3 and the concave portion 110 are fitted to each other, and the first part 102 and the second part 112 are assembled and fixed, whereby the oil supply path 105 and the oil supply path 115 are sealed by the O-ring 101. It communicates in a state.
Here, the depth of the concave portion 110 is set slightly deeper than the height of the convex portion 103,
Each assembly surface 102a, 112a has a clearance, but the O-ring 101 can be elastically deformed to absorb the tolerance between the assembly surfaces 102a, 112a.

However, each assembly surface 102a, 112a of the first and second parts 102, 112
In addition, when a plurality of oil supply paths 105 and 115 are opened, a plurality of O-rings 101 for sealing the oil supply paths 105 and 115 are necessary.
After the O-ring 101 is positioned and held in each seal housing portion 107, the O-ring 101 is
The convex portion 103 and the concave portion 110 need to be carefully fitted so as not to bite the ring 101, and there is a problem that assembly is extremely difficult.

Accordingly, an object of the present invention is to solve the above-mentioned problems, and the openings of a plurality of fluid passages that open to the assembly surface of the first part and the second part that are fitted and assembled to each other and communicate with each other. It is an object of the present invention to provide a seal structure that can be easily assembled and can communicate with each other in a well-sealed state.

The above object of the present invention is to provide a first part and a second part that are fitted together and assembled,
A plurality of fluid passages formed in the first part and the second part, respectively, which open to the assembly surface and communicate with each other;
A plurality of seal portions arranged in the opening communication portion in the assembly surface;
A seal structure comprising:
This is achieved by a sealing structure comprising a connecting substrate for connecting and holding the respective seal portions.

According to the seal structure having the above-described configuration, the plurality of seal portions corresponding to the plurality of fluid passages opened in the assembly surfaces of the first component and the second component that are fitted and assembled to each other are connected to the connection substrate. Are held together. Therefore, the first component and the second component can be assembled together by a seal member in which a plurality of seal portions are connected, and the number of assembly steps can be reduced.
Further, since the plurality of seal portions are coupled by the coupling substrate, it can be held at a predetermined relative position. Therefore, handling becomes easy and it is possible to cope with assembly in a narrow space.

In the sealing structure having the above-described configuration, it is preferable that a positioning target portion that is positioned on a positioning portion formed on the assembly surface of the first component or the second component is formed on the connection board. .
According to this configuration, since the positioned portion formed on the coupling substrate is positioned by the positioning portion formed on the corresponding assembly surface, the positioning accuracy of the seal member to which the seal portion is coupled is increased, and the assembly is performed. The attachment property itself can be improved.

Further, in the seal structure having the above configuration, the positioning portion is a through hole that penetrates the first component or the second component, and the positioned portion of the connection board is locked in the through hole. desirable.
According to this configuration, even after the first part and the second part are fitted together and assembled, the presence or absence of the seal part can be confirmed by visually confirming the positioned part. It is possible to prevent forgetting to assemble the sealing member to which is connected.

In the seal structure having the above-described configuration, it is desirable that the positioned portion has a tapered shape.
According to this configuration, the positioned portion can be easily positioned, and the positioned portion can be press-fitted into the through hole of the positioning portion and temporarily locked.

Moreover, in the sealing structure having the above-described configuration, it is desirable that the positioned portion has a thinned tip portion.
According to this configuration, the rigidity of the positioned portion can be appropriately reduced by removing the tip of the positioned portion. Therefore, the seal member to which the seal portion is connected can be temporarily locked with a small load, and the assembling property can be further improved.

In the sealing structure having the above-described configuration, it is preferable that the connection substrate is made of a metal plate.
According to this configuration, it is possible to reduce the thickness of the connection substrate while ensuring the necessary rigidity, and it is possible to make the seal member to which the seal portion is connected compact.

In the seal structure having the above-described configuration, it is preferable that the seal portion is insert-molded on the connection substrate.
According to this structure, the sealing member provided with the some sealing part and the connection board | substrate can be integrally formed easily.

In the seal structure configured as described above, it is preferable that the first part is a crankcase and the second part is a balancer housing.
According to the above configuration, it is possible to reliably seal a plurality of fluid passages opened in the respective assembly surfaces of the engine crankcase and the balancer housing that are fitted and assembled to each other.

According to the seal structure having the above-described configuration, the plurality of seal portions corresponding to the plurality of fluid passages opened in the assembly surfaces of the first component and the second component that are fitted and assembled to each other are connected to the connection substrate. Are held together. Therefore, the first component and the second component can be assembled together by a seal member in which a plurality of seal portions are connected, and the number of assembly steps can be reduced.
Further, since the plurality of seal portions are coupled by the coupling substrate, it can be held at a predetermined relative position. Therefore, handling becomes easy and it is possible to cope with assembly in a narrow space.
Therefore, a set that can be communicated in a well-sealed state with the openings of the plurality of fluid passages that open to the assembly surfaces of the first part and the second part that are fitted and assembled together and communicate with each other. A seal structure with easy attachment can be obtained.

DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a seal structure according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is a left side view of a motorcycle having a seal structure according to the present invention, FIG. 2 is a left side view of the motorcycle engine shown in FIG. 1, and FIG. 3 is a cross section of the motorcycle engine shown in FIG. 4 is an enlarged left side view of the main part of the motorcycle engine shown in FIG. 2, FIG. 5 is a cross-sectional view taken along the line V-V in FIG. 4, and FIG. 7 is a sectional view taken along the line VII-VII in FIG.
8 is a plan view and a cross-sectional view of the seal member shown in FIG. 4, and FIG. 9 is an exploded view of the seal member shown in FIG.

The motorcycle 1 shown in FIG. 1 is a cruiser type motorcycle. The motorcycle 1 has the following schematic structure.
A front fork 3 is pivotally supported by a head pipe (not shown) fixed to the front end of a double cradle type vehicle body frame 2, and a front wheel 4 is pivotally supported at the lower end of the front fork 3. Is arranged.
Further, a fuel tank 6 and a seat 7 are disposed on the upper part of the vehicle body frame 2, and the rear wheel 9 is pivoted at the rear end of the rear arm 8 pivotally supported by the rear arm bracket 2 b of the vehicle body frame 2. It is supported.

A rear suspension is disposed between the rear arm 8 and the vehicle body frame 2.
A footrest board 11 that supports the occupant's feet is disposed on the lateral sides of the left and right down tubes 2 a of the vehicle body frame 2.
A front fender 12 that covers the upper portion of the front wheel 4 is attached to the front fork 3. A rear frame (not shown) extending rearward from the upper end portion of the rear arm bracket 2b is attached with a rear fender 13 that covers substantially the upper half of the rear wheel 9, and a rear seat 14 is mounted on the upper surface of the rear fender 13. Is arranged.

As shown in FIGS. 2 and 3, an engine (motorcycle engine) 15 mounted in the cradle of the vehicle body frame 2 is an air-cooled four-cycle OHV / V type two-cylinder engine, and has the following schematic structure. Have
A front cylinder block 17 and a rear cylinder block 18 are disposed on the upper surface of the crankcase 16.
Are arranged so as to form a predetermined bank angle at the front and rear of the vehicle, and the front and rear cylinder blocks 17
, 18 are laminated on the upper joint surface, respectively, and a front cylinder head 19 and a rear cylinder head 20 are laminated and connected by a head bolt. Further, head covers 24a and 24b are mounted on the upper joint surfaces of the cylinder heads 19 and 20, respectively.

The front and rear cylinder blocks 17, 18 and the front and rear cylinder heads 19, 20
A plurality of cooling fins 50 and 51 are integrally formed on the outer peripheral wall of the outer peripheral wall so as to be substantially perpendicular to the bore axis. By directly applying the traveling air to each cylinder block 17, 18 and each cylinder head 19, 20, heat from the engine is radiated through the cooling fins 50, 51,
Thus, the engine 15 is cooled.

As shown in FIG. 3, the crankcase 16 has a structure in which a crankcase portion 16a in which the crankshaft 21 is accommodated and a transmission case portion in which a transmission mechanism (not shown) is accommodated are integrally formed.
The crankshaft 21 is disposed horizontally in the vehicle width direction and is set to rotate clockwise as viewed from the right side of the vehicle. The crankshaft 21 includes a crank pin 21a common to the front and rear cylinders, left and right crank webs 21b and 21b, and left and right crank journals 21c and 21c.

Pistons 22 are slidably inserted into the cylinder bores of the front and rear cylinder blocks 17 and 18, respectively, and each piston 22 is connected to a crank pin 21 a common to the front and rear of the crankshaft 21 via a connecting rod 23. Has been.
The intake valve opening and the exhaust valve opening provided in the front and rear cylinder heads 19 and 20 are respectively provided with an intake valve and an exhaust valve (not shown) so that the respective openings can be opened and closed. The intake and exhaust valves are driven to rotate forward and backward by the front and rear camshafts 31 and 31 that are rotationally driven by the crankshaft 21, and the bush rod 3
2 and 33 are driven to open and close by rotating the intake side and exhaust side rocker arms 34 and 35.

The camshafts 31, 31 are disposed in the crankcase 16 in parallel with the crankshaft 21, and are chained (not shown) by a drive gear 28 fixed to the right end of the crankshaft 21.
The rotation is driven via the timing gear 30.
Further, the intake side and exhaust side push rods 32 and 33 are respectively exposed to the right outer side along the cylinder axes of the front and rear cylinder blocks 17 and 18 and are cylindrical casings 36.
, 36.

The exhaust valve openings of the front and rear cylinder heads 19 and 20 are connected to the V
Derived to the outer wall of the bank. Front and rear exhaust pipes are connected to the front and rear exhaust ports, and each exhaust pipe extends rearward on the right side of the vehicle body and joins to the downstream end of the right side of the rear wheel 9. A muffler 44 disposed in the is connected.

The crankshaft 21 has left and right crank journals 21c connected to the crankcase portion 16a.
Are supported by boss portions 16c formed on the left and right side walls. A crank gear 85 is fixed to the left end portion (right end portion in FIG. 3) of the crankshaft 21 with a balancer gear 59 by key fitting.
The balancer gear 59 according to the present embodiment is a crankcase portion 16a of the crankcase 16.
The crankshaft 21 is rotatably supported by a balancer housing 60 fixed to the crankshaft 21.
And reverse rotation.

As shown in FIGS. 4 to 6, the balancer housing (second component) 60 has a concave portion 41 on a convex portion 40 projecting from the outer surface of the boss portion 16 c in the crankcase (first component) 16.
Are inlay structures that are fitted and assembled together, and are fixed by fixing screws 37.
In the cylindrical portion 60a of the balancer housing 60, an oil passage (fluid passage) 61 for supplying lubricating oil to a bearing bush 65 that rotatably supports the balancer gear 59 is formed.
Lubricating oil is supplied to the oil passage 61 of the balancer housing 60 via an oil supply passage (fluid passage) 62 formed in the crankcase 16 and discharged from an oil discharge passage (fluid passage) 63.

Therefore, an oil passage 61 and an oil supply passage 6 that open to the respective coupling surfaces 16b and 60c of the convex portion 40 of the crankcase 16 and the concave portion 41 of the balancer housing 60 and communicate with each other.
2, and the oil passage 61 and the oil discharge passage 63 are respectively sealed by the seal members 45.
As shown in FIGS. 8 and 9, the seal member 45 includes an oil passage 61 and an oil supply passage 62.
And a pair of annular elastic seal portions (seal portions) 46, 46 concentrically arranged corresponding to the oil passage 61 and the oil discharge passage 63, respectively, and these annular elastic seal portions 46, 46 are connected to each other at a predetermined relative position. And the assembly surface 60c of the balancer housing 60
Positioned portion 4 that engages with a pair of positioning holes (positioning portions) 60b, 60b formed in
7 and 47.

The connection board 48 is made of a metal plate curved in an arc shape along the outer peripheral surface of the cylindrical part 60a, and includes a pair of openings 48a and 48a into which the annular elastic seal parts 46 and 46 are fitted, a positioning part 47,
A pair of openings 48b, 48b into which 47 is fitted are formed.
The annular elastic seal portions 46 and 46 and the positioned portions 47 and 47 made of a rubber material are integrally formed on the connection substrate 48 by insert molding, for example.

The pair of positioning holes 60b, 60b formed in the balancer housing 60 is a through hole that allows the engaged positioned portions 47, 47 to be seen from the outside.
As shown in FIGS. 8 and 9, the positioned portion 47 has a tapered shape and the tip portion 47 a is thinned.

Therefore, when the balancer housing 60 is assembled to the crankcase 16, the seal member 45 is previously assembled at a predetermined position in the concave portion 41.
The seal member 45 engages the positioning portions 47 and 47 with the positioning holes 60 b and 60 b of the corresponding balancer housing 60, so that the annular elastic seal portions 46 and 46 are connected to the oil passage 6.
1 and 61 are arranged concentrically.

At this time, since the positioned portion 47 has a tapered shape, positioning of the seal member 45 is facilitated, and the positioned portion 47 can be press-fitted into the positioning hole 60b and temporarily locked. In addition, since the positioned portion 47 has the tip portion 47a which is thinned, when the rigidity is appropriately reduced, the seal member 45 to which the annular elastic seal portions 46 and 46 are connected is temporarily locked with a small load. This improves the ease of assembly.

That is, according to the seal structure of the present embodiment, the concave portion 41 of the balancer housing 60 to which the seal member 45 is temporarily locked and the convex portion 40 of the crankcase 16 are fitted to each other and assembled. Each annular elastic seal portion 46 that seals the oil passage 61 and the oil supply passage 62 and the oil passage 61 and the oil discharge passage 63 that are opened and communicated with the joint surfaces 16b and 60c.
46 is assembled in a state where a predetermined relative position is maintained.

Therefore, the balancer housing 60 and the crankcase 16 can be assembled together by the seal member 45 to which the plurality of annular elastic seal portions 46, 46 are connected, and the assembly man-hour can be reduced.
In addition, the seal member 45 is easy to handle because the pair of annular elastic seal portions 46, 46 are connected by the connecting substrate 48 and can be held at a predetermined relative position.
Can also be installed in tight spaces.

The depth of the concave portion 41 of the balancer housing 60 is set to be slightly deeper than the height of the convex portion 40 of the crankcase 16, and there is a clearance between the assembly surfaces 16b and 60c. When the fixing screw 37 is tightened, the annular elastic seal portions 46, 46 of the seal member 45 are elastically deformed, so that the tolerance between the assembled surfaces 16b, 60c can be absorbed.

Further, the seal member 45 according to the present embodiment has the assembly surface 6 of the balancer housing 60.
Positioned portions 47 and 47 that project into a pair of positioning holes 60b and 60b formed in 0c are provided. Therefore, the positioning accuracy of the sealing member 45 is increased and the assembling property itself is improved by engaging the positioned portion 47 protruding from the sealing member 45 with the positioning hole 60b of the corresponding assembling surface 60a. be able to.

Furthermore, since the positioning hole 60b of the present embodiment is a through hole that allows the positioned portion 47 that has been press-fitted and engaged to be viewed, the crankcase 16 and the balancer housing 60 are assembled and assembled together. Even after, the presence or absence of the seal member 45 can be confirmed by looking through the positioning hole 60b from the outside of the balancer housing 60 and visually confirming the positioned portion 47, and forgetting to attach the seal member 45 can be prevented.

Therefore, according to the seal structure of the present embodiment, the seal member 45 has the assembly surfaces 16b,
Each annular elastic seal portion 46 that seals the oil passage 61 and the oil supply passage 62 that are open and communicated with each other and the oil passage 61 and the oil discharge passage 63 is connected by a connection substrate 48 to have a predetermined relative position. Is retained.
Therefore, the balancer housing 60 and the crankcase 16 can be assembled together by the seal member 45 to which the plurality of annular elastic seal portions 46, 46 are connected, and the assembly man-hour can be reduced.

In addition, the seal member 45 is easy to handle because the pair of annular elastic seal portions 46, 46 are connected by the connecting substrate 48 and can be held at a predetermined relative position.
Can also be installed in tight spaces.
Accordingly, the oil passage 61 and the oil supply passage 62, and the oil passage 61 and the oil discharge passage 63 are opened on the respective assembly surfaces 16b and 60c of the crankcase 16 and the balancer housing 60 that are fitted and assembled with each other. Even when communicating with each other, it is possible to obtain a seal structure with easy assembly that allows these fluid passages to communicate with each other in a well-sealed state.

Note that the configurations of the seal portion, the connecting substrate, the seal member, the positioning portion, the positioned portion, and the like in the seal structure of the present invention are not limited to the configuration of the above-described embodiment, and various configurations can be made based on the spirit of the present invention. Of course, it can take a form.
For example, in the above embodiment, the connecting substrate 48 is formed of a metal plate, but the present invention is not limited to this, and various materials can be used. However, by forming the connection board with a metal plate, the connection board can be thinned while ensuring the required rigidity, and the seal member can be made compact.
Moreover, in the said embodiment, although the crankcase 16 and the balancer housing 60 in the engine 15 were demonstrated as an example of the 1st components and 2nd components which are mutually fitted and assembled | attached, this invention is limited to this. However, the present invention can be applied as a seal structure in the assembling surfaces of various first parts and second parts that are fitted together and assembled.

1 is a left side view of a motorcycle including a seal structure according to the present invention. Fig. 2 is a left side view of the motorcycle engine shown in Fig. 1. FIG. 2 is a cross-sectional view of the motorcycle engine shown in FIG. 1. Fig. 3 is an enlarged left side view of a main part of the motorcycle engine shown in Fig. 2. It is a VV cross-sectional arrow view of FIG. It is an expanded sectional view of the A section in FIG. It is a VII-VII cross-sectional arrow view of FIG. It is the top view and cross-sectional view of the sealing member shown in FIG. FIG. 9 is an exploded view of the seal member illustrated in FIG. 8. It is a principal part expanded sectional view which shows the conventional seal structure in the case of assembling component parts made into the inlay structure.

Explanation of symbols

1 Motorcycle 2 Body frame 4 Front wheel 9 Rear wheel 15 Engine 16 Crankcase (first part)
17 Front cylinder block 18 Rear cylinder block 21 Crankshaft 22 Starter gear 45 Seal member 46 Annular elastic seal part (seal part)
47 Positioned portion 48 Connection board 50 Cooling fin 59 Balancer gear 60 Balancer housing (second component)
60b Positioning hole (positioning part)
61 Oil passage (fluid passage)
63 Oil discharge passage (fluid passage)

Claims (8)

A first part and a second part fitted together and assembled;
A plurality of fluid passages formed in the first part and the second part, respectively, which open to the assembly surface and communicate with each other;
A plurality of seal portions arranged in the opening communication portion in the assembly surface;
A seal structure comprising:
A seal structure comprising a connecting substrate for connecting and holding the respective seal portions. 2. The seal according to claim 1, wherein a positioning portion to be positioned by a positioning portion formed on an assembly surface of the first component or the second component is formed on the connection substrate. Construction. The said positioning part is a through hole which penetrates the said 1st component or a 2nd component, and the to-be-positioned part of the said connection board | substrate is latched by the said through hole. Seal structure. The seal structure according to claim 3, wherein the positioned portion has a tapered shape. The seal structure according to claim 3, wherein a tip portion of the positioned portion is thinned.   The seal structure according to claim 1, wherein the connection substrate is made of a metal plate. The seal structure according to claim 1, wherein the seal portion is insert-molded on the connection substrate. The seal structure according to claim 1, wherein the first part is a crankcase, and the second part is a balancer housing.

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