JP3585000B2 - Split cover engagement structure - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to an engagement structure of a cover for covering a timing belt or the like at an end of an engine, particularly a split cover.
[0002]
[Prior art]
FIG. 20 shows an example of an engagement structure between cover pieces in a conventional split cover.
FIG. 20 shows a part of a cross section of an engine end. A timing belt 03 is wound around a pulley 02 fitted to an end of a camshaft 01 of a valve train. The timing belt cover 05, which is a split type cover, covers from the outside.
[0003]
The timing belt cover 05 is divided into a cover piece 06 and a cover piece 07, and the two are engaged with each other. The engagement end of one of the cover pieces 07 has a groove 07a on the end face extending in the circumferential direction. The sealing member 08 is fitted into the groove 07a, and the end face 06a of the engaging end of the other cover piece 06 is butted against the groove 07a of the engaging end of the cover piece 07. Then, the exposed portion of the seal member 08 fitted in the groove 07a is pressed and tightly tightened, and in this state, the cover pieces 06 and 07 are fixed to the engine body with bolts or the like, and the two cover pieces are engaged. ing.
[0004]
Cables that cross the cover that covers the engine end are provided with a U-shaped cross-section on the cover surface as shown in the example of Japanese Utility Model Application Laid-Open No. 63-146133. It is held in engagement.
[0005]
[Problem to be solved]
As described above, the cover pieces 06 and 07 are fixed to the engine body in a state where the end faces of the engagement end portions abut each other with the seal member 08 interposed therebetween, so that the variation in the interference of the seal members is large.
Since the cables are locked by the locking portions projecting from the cover surface, the appearance is impaired.
[0006]
SUMMARY OF THE INVENTION The present invention has been made in view of such a point, and an object thereof is to provide an engagement structure of a split type cover which has a small variation in interference of a seal member and is easy to assemble.
Another object of the present invention is to provide a split cover engaging structure which does not impair the appearance of the cables through the engaging portions between the cover pieces.
[0007]
Means and action for solving the problem
In order to achieve the above object, the invention according to the first aspect of the present invention is directed to an engagement end portion of each of the divided cover pieces of a divided cover in which a cover attached to an engine end and covering internal components is divided. In the engagement structure with a seal member interposed therebetween, the engagement end of one cover piece forms a ridge wall extending from the back side to the front side, and the engagement end of the other cover piece. Is formed at a predetermined interval from the outer peripheral side ridge wall and the inner peripheral side ridge wall extending toward the back side, and the ridge wall of the one cover part is formed on the outer periphery of the other cover part. The side protruding wall and the inner peripheral side protruding wall are fitted from the front side so as to be sandwiched therebetween, and the two cover pieces are engaged with each other, and the outer peripheral surface of the protruding wall of the one cover piece and the other side thereof directed sealing member in the circumferential direction between the outer peripheral surface of the inner circumferential side protrusion wall of the cover piece interposed, engagement of the one cover piece The end forms the ridge wall through a groove protruding to the back side, and cables extending across the cover are inserted into the groove, and the extended end of the engaging end of the other cover piece is extended. An engagement structure of a split type cover whose edges cover the cables is provided .
[0008]
The ridge wall of one cover piece is sandwiched between the outer ridge wall and the inner ridge wall of the other cover piece, and the outer peripheral surface of the ridge wall sandwiched and the other cover piece Since the seal member is interposed between the inner peripheral side ridge wall and the outer peripheral surface, the seal member is sandwiched between the two ridge walls of the other cover part together with the ridge wall of the one cover part and closely adhered. The seal can be sealed, the tightening allowance of the seal member can be easily controlled, the seal can always be reliably formed, and the number of fastening screws can be reduced.
[0009]
Also, the engaging end of the one cover piece forms the ridge wall through a groove protruding to the back side, and cables and the like that cross the cover are inserted into the groove, and the other cover piece is inserted. By using a split type cover engagement structure in which the cables are covered by the extended edge of the engagement end, there is no need to protrude the cover surface to provide a cable clamp or the like, thereby hiding cables. Appearance can be improved.
[0010]
【Example】
Hereinafter, an embodiment of the present invention shown in FIGS. 1 to 19 will be described.
FIG. 1 is an overall side view of a motorcycle 1 equipped with an engine having a split cover according to the present invention.
[0011]
In the motorcycle 1, the main frame 3 branches left and right from the upper part of the head pipe 2 and extends rearward diagonally downward, and the rear frame 4 and the seat rail 5 extend diagonally upward rearward from the lower end of the main frame 3. A down frame 6 extends downward and obliquely rearward from a lower portion of the head pipe 2, extends right and left from a lower end thereof, and an engine guard pipe 7 continues. A sub frame is formed between the lower ends of the left and right engine guard pipes 7 and the lower end of the main frame 3. 8 are connected in the front-rear direction.
[0012]
A front fork 9 is pivotally supported on the head pipe 2, a handle 10 is provided extending above the front fork 9, and a front wheel 11 is pivotally supported at a lower end of the front fork 9.
A rear fork 12 pivotally supported at the lower end of the main frame 3 is provided vertically swingably, and a rear wheel 13 is pivotally supported at the rear end. Between them, a shock absorber 14 is interposed.
[0013]
A fuel tank 15 straddles the main frame 3, and a seat 16 is provided behind the fuel tank 15 on a seat rail 5, and a sub-frame 8 is provided with a step 17, a change lever 18, a brake pedal 19 and a stand via a bracket. 20 etc. are supported.
[0014]
A horizontally opposed six-cylinder engine 30 is mounted in a space surrounded by the main frame 3, the down frame 6, the sub-frame 8, and the engine guard pipe 7.
The intake pipes 31L, 31R extend upward from the left and right cylinders 41L, 41R of the engine 30 and are curved inward to be connected to the corresponding carburetors 32L, 32R, respectively, and the carburetors 32L, 32R are disposed above the fuel tanks. 15 is connected to an air cleaner 33 located below.
An exhaust pipe 35 extends downward from each of the cylinders 41L and 41R of the engine 30 and is bent rearward to be connected to a muffler 36.
[0015]
FIG. 2 is a front view of the engine 30 with the carburetors 32L and 32R and the exhaust pipe 35 omitted, FIG. 3 is a left side view thereof, and FIG. 4 is a schematic top view showing the positions of the carburetors 32L and 32R. FIG. 5 is a cross-sectional view taken along line VV in FIG. 3, and FIG. 6 is a rear view of the engine partially omitted.
[0016]
The right and left cylinders 41L and 41R of the cylinder block 40 are located on the right and left cylinders 41L and 41R, respectively. The pistons 42L and 42R reciprocate in the cylinders 41L and 41R. Connecting rods 43L and 43R, one ends of which are pivotally connected, are connected to the central crankshaft 50 with their front and rear positions alternately shifted.
[0017]
Camshafts 46L, 46R of a valve train are supported rotatably in the front-rear direction by cylinder heads 44L, 44R and camshaft holders 45L, 45R provided continuously to the left and right of the cylinder block 40.
[0018]
As shown by broken lines in FIGS. 3 and 4, each intake port 47L of the cylinder head 44L corresponding to the left cylinder 41L in FIG. 6 has a cylinder 41L-side intake port 47La located forward of the center of the cylinder and an intake valve 48L. The intake pipe 31L is further bent somewhat forward and connected to the intake pipe 31L, and the intake pipe 31L is connected to the carburetor 32L without being bent in the front-rear direction.
[0019]
On the other hand, the intake port 47R (not shown) of the right cylinder 41R is connected to the intake pipe 31R by bending slightly further from the intake port 47Ra (see FIG. 4) located behind the center of the cylinder 41R. Therefore, the left and right cylinders 41L, 41R are shifted forward and backward, but the left and right carburetors 32L, 32R are substantially the same in the front-rear direction together with the intake pipes 31L, 31R.
[0020]
Therefore, by slightly bending the intake ports 47L, 47R, the front and rear positions of the left and right carburetors 32L, 32R can be made the same, and the front and rear length of the carburetor arrangement can be reduced. Low resistance.
Further, since the intake pipes 31L and 31R are not bent in the front-rear direction, the same pipes can be used in common for the left and right sides, and cost can be reduced.
[0021]
The left and right carburetors 32L and 32R drive the throttle valves by the same throttle valve shafts 32La and 32Ra supported by the front and rear stays 38 and 38, respectively. As shown in FIG. , 32Ra are connected by a connecting rod 32b, and the left throttle valve shaft 32La is also interlocked by driving the right throttle valve shaft 32Ra through a slot cable.
[0022]
Timing belts 53L, 53R are provided between the crank pulley 51 fitted to the front end of the crankshaft 50 and the pulleys 52L, 52R fitted to the front ends of the left and right camshafts 46L, 46R. It is bridged through.
The timing belts 53L and 53R are covered with a split cover 60 from the front.
An AC generator 55 is provided behind the center of the engine 30, and an oil pan 56 is provided below the crankshaft 50 so as to swell.
[0023]
The split type cover 60 that covers the timing belts 53L and 53R on the front of the engine 30 includes a left cylinder cover piece 61 and a right cylinder head that cover the front of the central cylinder block 40, the left cylinder head 44L, and the left camshaft holder 45L. 44R and a right cover piece 62 that covers the front of the right camshaft holder 45R.
[0024]
The shape of the left cover piece 61 is shown in FIGS.
The left cover piece 61 is elongated in the left and right direction, has an arc shape at the left end, bulges forward on the inside, forms a flat box shape by the front wall 61a and the peripheral wall 61b, and a portion of the front wall 61a facing the crank pulley 51. Form a circular hole 61c.
Grooves 61d are formed in the edge of the peripheral wall 61b in the circumferential direction, and several mounting holes 61e are provided at appropriate positions.
[0025]
The engaging portion of the peripheral wall 61b, which is aligned with the right cover piece 62, forms a vertically oriented side wall 61f having a plane perpendicular to the left and right horizontal direction, and a ridge wall 61h parallel to the side wall 61f is recessed on the back side. The projecting groove 61g is formed at the same time, so that the projecting wall 61h extends from the back side to the front side from the side wall 61f via the groove 61g.
Grooves 61i are formed on the outer peripheral surface of the protruding ridge wall 61h so that the upper and lower portions are bent rearward and are directed in the vertical direction.
A seal member 63 is fitted into the groove 61i and the groove 61d at the edge of the peripheral wall 61b.
[0026]
On the other hand, as shown in FIGS. 13 to 18, the right cover piece 62 is short in the left and right directions, the right edge is substantially arcuate, the left edge is vertically straight, the inside bulges forward, and the front wall 62 a The peripheral box 62b has a flat box shape.
A groove 62d is formed in the end portion of the peripheral wall 62b in the circumferential direction except for the engaging portion, a seal member is fitted, and several mounting holes 62e are provided at appropriate positions.
The engaging end of the front wall 62a has two protruding ridge walls 62f and 62g perpendicular to the left-right horizontal direction extending in parallel toward the back side at predetermined intervals on the outer peripheral side and the inner peripheral side. I have.
The outer peripheral side protruding wall 62f has a shorter protruding length than the inner peripheral side protruding wall 62g, and the edge 62h of the front wall 62a extends slightly further to the left than the outer peripheral side protruding wall 62f.
[0027]
The attachment of the left cover piece 61 and the right cover piece 62 and the method of engagement between them are as follows. First, the left cover piece 61 is bolted to the left cylinder head 44L and the camshaft holder 45L via the cylinder block 40 and the bracket 67. A gear position code 70 and an oil pressure code 71 which vertically cross the front of the engine are inserted into grooves 61g at the engagement end of the left cover piece 61.
[0028]
Then, as shown in FIG. 19, the engaging portion of the right and left cover pieces 61 and 62 is formed with the outer peripheral side ridge wall 62f of the engaging end of the right cover piece 62 and the groove of the engaging end of the left cover piece 61. The right side of the right cylinder head 44R is covered by slightly inserting it into the ridge 61g and hooking it on the ridge wall 61h, and swinging the right end of the right cover piece 62 backward using the hook as a fulcrum.
[0029]
Then, the ridge wall 61h of the left cover piece 61 fits between the outer peripheral ridge wall 62f and the inner peripheral ridge wall 62g of the right cover piece 62, and is formed on the outer peripheral surface of the ridge wall 61h. The inner peripheral side protruding ridge wall 62g presses the seal member 63 fitted into the groove 61i from the outside and closely contacts the seal member 63, so that the sealing property can be improved.
In this state, the right cover piece 62 is screwed and tightened to the right cylinder head 44R with the bolt 66 via the gracket 68.
[0030]
In this manner, the cover pieces 61 and 62 are easily assembled and have good assemblability, and the outer circumferential ridge wall 62f and the inner circumferential ridge wall 62g of the right cover piece 62 are sealed together with the ridge wall 61h by the sealing member 63. Is tightly pressed and tightened, so that the interference can be easily managed, and the seal can be always reliably pressed and sealed.
Moreover, since the sealing member 63 is not pinched by a bolt or the like, the number of bolts for fixing the cover pieces 61 and 62 can be reduced.
[0031]
With the left and right cover pieces 61, 62 attached, the gear position code 70 and the oil pressure code 71 inserted into the groove 61g are hidden by the edge 62h of the right cover piece 62, and are in front of the right cover piece 62. The wall 62a and the front wall 61a of the left cover piece 61 are continuous and coplanar, and the appearance is not impaired by the gear position code 70 and the oil pressure code 71 or by a clamp for fixing these codes. Performance can be improved.
In addition, clamps and the like can be reduced.
In addition, a cover member 80 is covered on a circular hole 61 c of the left cover piece 61 facing the crankshaft 50, and is fixed with a bolt 81.
[0032]
【The invention's effect】
According to the present invention, an outer peripheral wall and an inner peripheral side wall having a U-shaped cross section of the other cover part sandwich a projection wall of one cover piece therebetween, and an outer periphery of the sandwiched projection wall is provided. Since the seal member is interposed between the surface and the outer peripheral surface of the inner peripheral side ridge wall of the other cover piece, the seal member is sandwiched between the U-shaped ridge walls and closely contacted, and the seal member is tightened. The management of the cost is easy and the number of fastening screws can be reduced.
[0033]
Further, the engaging end of one cover piece forms the ridge wall through a groove protruding to the back side, cables are inserted into the groove, and the engaging end of the other cover piece is formed. By covering the cables with the extended edges, it is not necessary to provide a cable clamp or the like protruding from the cover surface, and the cables can be hidden to improve the appearance.
[Brief description of the drawings]
FIG. 1 is an overall side view of a motorcycle 1 equipped with an engine having a split cover according to one embodiment of the present invention.
FIG. 2 is a front view of the engine with a carburetor, an exhaust pipe and the like omitted.
FIG. 3 is a left side view of the same.
FIG. 4 is a schematic top view showing a position of a carburetor.
FIG. 5 is a sectional view taken along line VV in FIG. 3;
FIG. 6 is a rear view of the engine partially omitted.
FIG. 7 is a top view of the left cover piece.
FIG. 8 is a front view of the same.
FIG. 9 is a sectional view taken along line IX-IX in FIG. 8;
FIG. 10 is a rear view of the same.
FIG. 11 is a right side view of the same.
FIG. 12 is a sectional view taken along line XII-XII in FIG.
FIG. 13 is a top view of the right cover piece.
FIG. 14 is a front view of the same.
FIG. 15 is a cross-sectional view taken along the line XV-XV in FIG.
FIG. 16 is a rear view of the same.
FIG. 17 is a right side view of the same.
FIG. 18 is a sectional view taken along line XVIII-XVIII in FIG.
FIG. 19 is a cross-sectional view showing an engagement portion between left and right cover pieces.
FIG. 20 is a partial cross-sectional view of a conventional engine end.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Motorcycle, 2 ... Head pipe, 3 ... Main frame, 4 ... Rear frame, 5 ... Seat rail, 6 ... Down frame, 7 ... Engine guard pipe, 8 ... Subframe, 9 ... Front fork, 10 ... Handlebar, 11 front wheel, 12 rear fork, 13 rear wheel, 14 shock absorber, 15 fuel tank, 16 seat, 17 step, 18 change lever, 19 brake pedal, 20 stand,
Reference numeral 30: engine, 31L, 31R: intake pipe, 32L, 32R: carburetor, 33: air cleaner, 35: exhaust pipe, 36: muffler, 38: stay,
40: cylinder block, 41L, 41R: cylinder, 42L, 42R: piston,
43L, 43R ... connecting rod, 44L, 44R ... cylinder head, 45L, 45R ... cam shaft holder, 46L, 46R ... cam shaft, 47L, 47R ... intake port, 48L, 48R ... intake valve,
50: crankshaft, 51: crank pulley, 52L, 52R: pulley, 53L, 53R: dimming belt, 54L, 54R: tension pulley, 55: AC generator, 56: oil pan,
60: split cover, 61: right cover piece, 62: right cover piece, 63: sealing member,
65, 66 ... bolt, 67, 68 ... bracket,
70: gear position code, 71: oil pressure code,
80: lid member, 81: bolt.

Claims (1)

In an engagement structure in which a seal member is interposed between the engagement ends of each of the divided cover pieces of the divided type cover in which the cover attached to the engine end and covering the internal components is divided,
The engaging end of one cover piece forms a ridge wall extending from the back side to the front side,
The engaging end portion of the other cover piece forms an outer peripheral ridge wall and an inner peripheral ridge wall extending toward the back side at a predetermined interval from each other,
The protrusions of the one cover piece are fitted from the front side so that the outer circumference protrusion wall and the inner circumference protrusion wall of the other cover piece are sandwiched therebetween, and the two cover pieces engage with each other. And
A seal member is circumferentially interposed between the outer peripheral surface of the ridge wall of the one cover piece and the outer peripheral surface of the inner peripheral ridge wall of the other cover piece ,
The engaging end of the one cover piece forms the ridge wall via a groove protruding to the back side,
Insert cables that cross the cover into the groove,
An engaging structure for a split-type cover , wherein the cables are covered with an extended edge of an engaging end of the other cover piece .

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