JP2013231385A - Engine and saddle-ride type vehicle - Google Patents

Abstract

An object of the present invention is to suppress engine noise.
A cylinder head cover 18 includes a cover main body 181, a convex portion 182, a first rib 185, a second rib 186, and a third rib 187. The first rib 185 extends along the boundary T between the cover body 181 and the convex portion 182. Each of the second and third ribs 186 and 187 is connected to the first rib 185 on the opposite side of the convex portion 182 across the first rib 185.
[Selection] Figure 6

Description

  The present invention relates to an engine including a cylinder head cover and a saddle riding type vehicle.

  Conventionally, for the purpose of improving the maintainability of the camshaft, a method has been proposed in which a recess is formed at the end on the cylinder head cover side of the cylinder head for housing the camshaft (see Patent Document 1). In Patent Document 1, a seal member that fits into a concave portion of a cylinder head is attached to the cylinder head cover.

JP 2008-25451 A

  However, the technique of Patent Document 1 has a problem that noise is generated from the engine due to vibration of the seal member fitted in the recess of the cylinder head.

  An object of the present invention is to suppress engine noise.

  An engine according to a first aspect of the present invention includes a crankcase that houses a crankshaft, a cylinder body connected to the crankcase, a cylinder head connected to the cylinder body, and a cylinder head cover connected to the cylinder head. And a camshaft disposed in a space formed between the cylinder head and the cylinder head cover. The cylinder head is formed at an end portion on the cylinder head cover side, and has a recess that allows at least a part of the cam shaft to be visually recognized. The cylinder head cover includes a cover main body that covers the cylinder head, a convex portion that protrudes from the cover main body toward the cylinder head from the cover main body, and that fits into the concave portion, and first to third ribs. The first rib is formed along the boundary between the cover main body and the convex portion on the side surface of the cover main body and extends in the first direction. The second and third ribs are connected to the first rib on the side opposite to the convex portion across the first rib. The convex portion is formed integrally with the cover body.

  According to the engine according to the first aspect of the present invention, vibrations caused by minute undulations and twists of the convex portions can be reduced, so that generation of noise from the engine can be suppressed. Moreover, since the convex part is formed integrally with the cover body, the cylinder head cover can be manufactured by using, for example, a mold. Therefore, compared with the case where a cover main body and a convex part are produced separately, a manufacturing process and manufacturing cost can be reduced.

  The engine according to the second aspect of the present invention relates to the first aspect, and at least one of the second and third ribs extends from the first rib toward the side opposite to the convex portion on the side surface.

  According to the engine according to the second aspect of the present invention, the first rib can be firmly supported by the second and third ribs, so that the vibration of the convex portion can be further reduced.

  An engine according to a third aspect of the present invention relates to the second aspect, wherein the convex portion includes first and second end portions in the first direction, and the second rib is first across the first rib. The third rib is disposed on the opposite side of the end portion, and the third rib is disposed on the opposite side of the second end portion with the first rib interposed therebetween.

  According to the engine according to the third aspect of the present invention, since both ends of the convex portion can be firmly fixed, the vibration of the convex portion can be further reduced.

  The engine according to the fourth aspect of the present invention relates to any one of the first to third aspects, and the convex portion is formed in a semicircular shape in a plan view of the side surface.

  The engine according to the fifth aspect of the present invention relates to any one of the first to fourth aspects, and each of the first rib, the second rib, and the third rib is formed integrally with the cover body. .

  According to the engine of the fifth aspect of the present invention, the first to third ribs can be produced together with the cover body by using, for example, a mold. Therefore, the manufacturing process and the manufacturing cost can be reduced as compared with the case where the cover main body and the first to third ribs are separately manufactured.

  A straddle-type vehicle according to a sixth aspect of the present invention includes the engine according to the first aspect and a vehicle body frame that supports the engine.

  ADVANTAGE OF THE INVENTION According to this invention, the engine and saddle riding type vehicle which can suppress noise can be provided.

Side view of saddle riding type vehicle 1 Cross section of the engine unit with the engine cut along a horizontal plane Sectional view of the engine unit with the engine cut in a vertical plane Side view showing the configuration of the cylinder head Side view showing the configuration of the cylinder head cover The perspective view which shows the structure of a cylinder head cover Side view showing another configuration of the cylinder head cover Side view showing another configuration of the cylinder head cover

  Next, embodiments of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, the drawings are schematic, and the ratio of each dimension may be different from the actual one. Accordingly, specific dimensions and the like should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

(Schematic configuration of saddle riding type vehicle 1)
Hereinafter, a schematic configuration of a saddle riding type vehicle 1 according to an embodiment of the present invention will be described with reference to the drawings. In this embodiment, unless otherwise specified, the “front-rear direction” refers to the vehicle front-rear direction when viewed from a rider seated on a seat 5 described later. The “left / right direction” refers to the left / right direction of the vehicle as viewed from a rider seated on the seat 5. “Up and down direction” refers to the vertical direction.

  FIG. 1 is a side view of a saddle riding type vehicle 1 according to the present embodiment. The saddle riding type vehicle 1 is a scooter type motorcycle. The saddle riding type vehicle 1 includes a vehicle body 2, a front fork 3, a front wheel 4, a seat 5, an engine unit 6, and a rear wheel 7.

  The vehicle body 2 includes a vehicle body frame that supports the engine unit 6 and a vehicle body cover that covers the vehicle body frame. The front fork 3 rotatably supports the front wheel 4. The seat 5 is disposed on the vehicle body 2 behind the front fork 3.

  The engine unit 6 is disposed below the seat 5. The engine unit 6 is swingably supported by the vehicle body frame via a bracket (not shown). The engine unit 6 includes an engine 10 and a conduction case 20. In the present embodiment, a water-cooled four-cycle single-cylinder SOHC (Single OverHead Camshaft) engine is exemplified as the engine 10, but the engine 10 may be an SOHC engine. The conduction case 20 supports the rear wheel 7 in a rotatable manner.

(Configuration of engine unit 6)
Next, the configuration of the engine unit 6 will be described with reference to the drawings. FIG. 2 is a cross-sectional view of the engine 10 cut along a horizontal plane. FIG. 3 is a cross-sectional view of the engine unit 6 in which the engine 10 is cut along a vertical plane.

  The engine 10 includes a crankcase 11, a generator 12, a crankshaft 13, a cylinder body 14, a piston 15, a connecting rod 16, a cylinder head 17, a cylinder head cover 18, and a valve mechanism 19. . The conduction case 20 houses a V-belt type automatic transmission 21, a centrifugal clutch 22, and a gear type speed reducer 23.

  The crankcase 11 is connected to the right side of the front end of the conduction case 20 and is disposed in front of the rear wheel 7. The crankcase 11 houses the crankshaft 13.

  The generator 12 is disposed on the right side of the crankcase 11. The generator 12 generates electricity by the rotational force of the crankshaft 13.

  The crankshaft 13 is disposed along the left-right direction in the crankcase 11. The right end portion of the crankshaft 13 is connected to the generator 12, and the left end portion of the crankshaft 13 is connected to the V-belt type automatic transmission 21. A drive sprocket 13a around which a cam chain 14a described later is wound is attached to the crankshaft 13. The rotational force of the crankshaft 13 is transmitted to the rear wheel 7 via the V-belt automatic transmission 21, the centrifugal clutch 22 and the gear reducer 23, and is also transmitted to the cam chain 14a via the drive sprocket 13a. .

  The cylinder body 14 is connected to the front of the crankcase 11. The cylinder body 14 accommodates the piston 15 and the connecting rod 16. The piston 15 is supported so as to be able to reciprocate within the cylinder body 14. The connecting rod 16 is connected to the piston 15 and the crankshaft 13. The reciprocating motion of the piston 15 is transmitted to the crankshaft 13 through the connecting rod 16. A cam chain chamber 14S for accommodating the cam chain 14a is formed in the cylinder body 14. The rear end portion of the cam chain 14a is wound around the drive sprocket 13a, and the front end portion of the cam chain 14a is wound around a driven sprocket 19b described later.

  The cylinder head 17 is connected to the front of the cylinder body 14. The cylinder head cover 18 is connected in front of the cylinder head 17. Inside the cylinder head 17 and the cylinder head cover 18, a cam chamber 19S for accommodating the valve mechanism 19 is formed. The cam chamber 19S is an example of “a space formed between the cylinder head and the cylinder head cover”. The configurations of the cylinder head 17 and the cylinder head cover 18 will be described later.

  The valve mechanism 19 includes a camshaft 19a and a driven sprocket 19b. The camshaft 19a is disposed along the left-right direction. The driven sprocket 19b is attached to the left end portion of the camshaft 19a. A cam chain 14a is wound around the driven sprocket 19b.

(Configuration of cylinder head 17)
Next, the configuration of the cylinder head 17 will be described with reference to the drawings. FIG. 4 is a side view showing the configuration of the cylinder head 17.

  The cylinder head 17 includes a cylinder body side end 171, a cover side end 172, a recess 173, a side surface 174, and a flange portion 175.

  The cylinder body side end 171 corresponds to the rear end of the cylinder head 17 and is connected to the cylinder body 14. The cover side end 172 corresponds to the front end of the cylinder head 17 and is connected to the cylinder head cover 18.

  The recess 173 is formed in the cover side end 172. The recess 173 is formed by cutting out a part of the front end of the side surface 174. The concave portion 173 is formed at a position and size such that the camshaft 19a can be visually recognized from the outside of the cylinder head 17. In the present embodiment, the cam shaft 19a can be pulled out of the recess 173 to the outside because substantially the entire cam shaft 19a is located inside the recess 173 when the cylinder head 17 is viewed from the side. However, the present invention is not limited to this, and the recess 173 may be formed so that at least a part of the camshaft 19a can be visually recognized in a side view of the cylinder head 17. That is, as shown in FIG. 4, a part of the camshaft 19 a is positioned in the visual recognition area r between the front end line R 1 indicating the front end of the recess 173 and the rear end line R 2 indicating the rear end of the recess 173. That's fine. Further, it is more preferable that the concave portion 173 is formed so that the driven sprocket 19b can be visually recognized from the outside of the cylinder head 17. Such a recess 173 provides easy access to the camshaft 19a, the driven sprocket 19b, and the cam chain 14a when the valve mechanism 19 is maintained.

  The side surface 174 is a surface that is substantially orthogonal to the direction in which the camshaft 19 a extends (that is, the left-right direction) on the outer peripheral surface of the cylinder head 17. Therefore, as shown in FIG. 4, one end of the camshaft 19 a is disposed inside the recess 173.

  The flange portion 175 is formed along the front end of the cover side end portion 172. The flange portion 175 is connected to the cylinder head cover 18 via a gasket described later.

(Configuration of cylinder head cover 18)
Next, the configuration of the cylinder head cover 18 will be described with reference to the drawings. FIG. 5 is a side view showing the configuration of the cylinder head cover 18. FIG. 6 is a perspective view showing the configuration of the cylinder head cover 18.

  The cylinder head cover 18 includes a cover main body 181, a convex portion 182, a first rib 185, a second rib 186, and a third rib 187.

  The cover body 181 is a lid-like member that covers the cylinder head 17. The cover main body 181 includes a flange portion 181a, a side surface 183, and an opposing surface 184. The flange portion 181a is fitted to the flange portion 175. A gasket (not shown) is attached to the inside of the flange portion 181a. The side surface 183 is a surface of the outer peripheral surface of the cover body 181 that is substantially orthogonal to the left-right direction. Therefore, the side surface 183 is substantially parallel to the side surface 174 of the cylinder head 17. The facing surface 184 is a surface facing the cylinder head 17. The position of the facing surface 184 in the side view coincides with the boundary line R5 indicating the boundary T.

  The convex portion 182 is formed in a semicircular shape so as to protrude from the cover body 181 toward the cylinder head 17. The convex portion 182 is fitted into the concave portion 173 of the cylinder head 17. That is, the convex portion 182 functions as a cover for closing the concave portion 173. In the present embodiment, the convex portion 182 is formed integrally with the cover main body 181 (specifically, the flange portion 181a). In FIG. 5, the upper end line R3 indicating the upper end portion 182a (an example of the first end portion) of the convex portion 182; the lower end line R4 indicating the lower end portion 182b (an example of the second end portion) of the convex portion 182; A boundary line R5 indicating the boundary T between 181 and the convex portion 182 is illustrated.

  The first rib 185 is disposed on the side surface 183 of the cover body 181. The first rib 185 extends in the vertical direction (an example of the first direction) along the boundary T between the cover main body 181 and the convex portion 182. In the present embodiment, the first rib 185 is formed over the entire vertical direction of the side surface 183. Therefore, the upper end of the first rib 185 extends upward beyond the second rib 186, and the lower end of the first rib 185 extends downward beyond the third rib 187. In the present embodiment, the first rib 185 is formed integrally with the cover body 181.

  The second rib 186 is disposed on the side surface 183 of the cover body 181. The second rib 186 is connected to the first rib 185 on the opposite side of the convex portion 182 across the first rib 185. The second rib 186 extends from the first rib 185 toward the side opposite to the convex portion 182 (that is, the front side). The second rib 186 has a rectangular outer shape in a side view. The second rib 186 is disposed so as to be orthogonal to the first rib 185 in a side view. The second rib 186 is disposed on the opposite side of the upper end 182a of the convex portion 182. Accordingly, the second rib 186 overlaps the upper end line R3 indicating the upper end 182a of the convex portion 182 in a side view.

  The third rib 187 is disposed on the side surface 183 of the cover body 181. The third rib 187 is connected to the first rib 185 on the opposite side of the convex portion 182 across the first rib 185. The third rib 187 extends from the first rib 185 toward the side opposite to the convex portion 182 (that is, the front side). The third rib 187 has a rectangular outer shape in a side view. The third rib 187 is disposed so as to be orthogonal to the first rib 185 in a side view. The third rib 187 is disposed on the opposite side of the lower end portion 182b of the convex portion 182. Therefore, the 3rd rib 187 has overlapped with lower end line R4 which shows lower end part 182b among convex parts 182 in a side view.

(Function and effect)
(1) The cylinder head cover 18 according to the present embodiment includes a cover body 181, a convex portion 182, a first rib 185, a second rib 186, and a third rib 187. The first rib 185 extends in the vertical direction (an example of the first direction) along the boundary T between the cover main body 181 and the convex portion 182. Each of the second and third ribs 186 and 187 is connected to the first rib 185 on the opposite side of the convex portion 182 across the first rib 185.

  Accordingly, since vibrations caused by minute waviness or twisting of the convex portion 182 can be reduced, it is possible to suppress the generation of noise from the engine 10.

  In the cylinder head cover 18 according to the present embodiment, the convex portion 182 is formed integrally with the cover body 181.

  Therefore, for example, the cylinder head cover 18 can be manufactured by using a mold, so that the manufacturing process and the manufacturing cost can be reduced as compared with the case where the cover main body 181 and the convex portion 182 are separately manufactured.

  (2) Each of the second and third ribs 186 and 187 extends from the first rib 185 toward the opposite side of the convex portion 182.

  Accordingly, since the first rib 185 can be firmly supported by the second and third ribs 186 and 187, the vibration of the convex portion 182 can be further reduced.

  (3) The second rib 186 is disposed on the opposite side of the upper end 182a (an example of the first end) of the convex portion 182, and the third rib 187 is the lower end 182b (second end of the convex portion 182). It is arrange | positioned on the opposite side of the example of a part.

  Therefore, since both ends of the convex portion 182 can be firmly fixed, the vibration of the convex portion 182 can be further reduced.

  (4) Each of the first rib 185, the second rib 186, and the third rib 187 is formed integrally with the cover body 181.

  Therefore, for example, the first to third ribs 185 to 187 can be manufactured together with the cover body 181 by using a mold, so that compared to the case where the cover body 181 and the first to third ribs 185 to 187 are separately manufactured, The manufacturing process and manufacturing cost can be reduced.

(Other embodiments)
Although the present invention has been described according to the above-described embodiments, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  (A) In the above-described embodiment, the first rib 185 is formed over the entire vertical direction of the side surface 183, but is not limited thereto. For example, as shown in FIG. 7, the first rib 185 may be disposed between the second rib 186 and the third rib 187.

  (B) In the above-described embodiment, each of the second and third ribs 186 and 187 has a rectangular outer shape in a side view, but is not limited thereto. For example, the outer shape of the second and third ribs 186 and 187 may be any shape such as a circular shape (including a semicircle) or a triangular shape (including an isosceles triangle or a right triangle) as shown in FIG. Can be set.

  In addition, each of the second and third ribs 186 and 187 is arranged to be orthogonal to the first rib 185 in a side view, but is not limited thereto. Each of the second and third ribs 186 and 187 may be disposed obliquely with respect to the first rib 185 in a side view.

  (C) In the above-described embodiment, each of the concave portion 173 and the convex portion 182 has a semicircular outer shape when viewed from the side, but is not limited thereto. The outer shape of the concave portion 173 and the convex portion 182 can be set to an arbitrary shape such as a triangular shape or a square shape.

  (D) In the above-described embodiment, the arrangement of each member has been described using the expression of the front-rear direction, the left-right direction, or the up-down direction, but is not limited thereto. For example, the engine 10 may not be disposed along the front-rear direction, and the crankshaft 13 may not be disposed along the left-right direction. As described above, the arrangement of the members can be appropriately changed according to the overall configuration of the saddle riding type vehicle 1.

  (E) Although the scooter type motorcycle has been described as an example of the saddle riding type vehicle in the above embodiment, the present invention is not limited to this. The saddle riding type vehicle includes not only motorcycles but also rough terrain vehicles (ALL-TERRAIN VEHICLE), snowmobiles, and the like. In addition to the scooter type, the motorcycle includes an off-road type, an on-road type, and a moped type.

  As described above, the present invention naturally includes various embodiments not described herein. Therefore, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.

  According to the present invention, noise of the engine can be suppressed, which is useful in the engine field and the saddle type vehicle field.

DESCRIPTION OF SYMBOLS 1 Saddle-type vehicle 2 Car body 6 Engine unit 10 Engine 11 Crankcase 12 Generator 13 Crankshaft 14 Cylinder body 15 Piston 16 Connecting rod 17 Cylinder head 173 Recessed part 18 Cylinder head cover 182 Convex part 185 1st rib 186 2nd rib 187 3rd Rib 19 Valve mechanism 19a Camshaft 19b Driven sprocket

Claims (6)

A crankcase that houses the crankshaft;
A cylinder body connected to the crankcase;
A cylinder head connected to the cylinder body;
A cylinder head cover connected to the cylinder head;
A camshaft disposed in a space formed between the cylinder head and the cylinder head cover;
With
The cylinder head is formed at an end portion on the cylinder head cover side, and has a recess that can visually recognize at least a part of the camshaft.
The cylinder head cover is
A cover body covering the cylinder head;
Projecting from the cover main body toward the cylinder head from the cover main body, and a convex portion fitted into the concave portion,
A first rib formed on a side surface of the cover body along a boundary between the cover body and the protrusion, and extending in a first direction;
Second and third ribs connected to the first rib on the opposite side of the convex portion across the first rib on the side surface;
Have
The convex portion is formed integrally with the cover body.
engine. At least one of the second and third ribs extends from the first rib toward the opposite side of the convex portion on the side surface.
The engine according to claim 1. The convex portion includes first and second end portions in the first direction,
The second rib is disposed on the opposite side of the first end portion across the first rib,
The third rib is disposed on the opposite side of the second end portion across the first rib.
The engine according to claim 2. The convex portion is formed in a semicircular shape in a plan view of the side surface.
The engine according to any one of claims 1 to 3. Each of the first rib, the second rib, and the third rib is formed integrally with the cover body.
The engine according to any one of claims 1 to 4. An engine according to claim 1;
A body frame that supports the engine;
A straddle-type vehicle.

Images