JP2005042710A - Engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an engine with shortened fastening bolts and stabilized axial force. <P>SOLUTION: In this engine, two or more openings 16b, 16c are formed in a cylinder head 16, a stud bolt 31 and a fastening nut 32 for fixing the cylinder head 16 to a cylinder block are exposed to the outside through the openings 16b, 16c, and the two or more openings 16b, 16c are removably covered with a tappet adjusting cover. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an engine for attaching a cylinder head to a cylinder block via a head fastening member.

  Conventionally, in an engine, a cylinder head is fastened and fixed to the upper side of the cylinder block by a plurality of tightening bolts, and a piston is reciprocally disposed in the cylinder block. An intake valve and an exhaust valve that open and close the formed combustion chamber are provided, and a rocker arm that presses these valves is further provided (see Patent Document 1).

A tappet adjustment cover is detachably disposed on the cylinder head, and the tappet adjustment cover can be adjusted by removing the tappet adjustment cover.
Utility Model Registration No. 25688446.

  However, in such a conventional device, the head of the tightening bolt that fixes the cylinder head is exposed to the upper portion of the cylinder head, so that the position of the head of the tightening bolt is positioned upward. As a result, the length of the tightening bolt increases and the height of the engine increases by the amount of the bolt head.

  In addition, when the screw hole through which the tightening bolt is inserted and the oil passage are used in common, a reliable seal on the seat surface of the bolt head is indispensable. There was a problem that the outer wall of the cylinder head was soiled by the oil oozing from the seating surface.

  Therefore, the present invention has been made in view of the above points, and an object of the present invention is to provide an engine that can shorten the tightening bolt and stabilize the axial force.

  Another problem is to prevent the cylinder head from getting dirty even in the unlikely event that the seal can be simplified or eliminated.

  In order to achieve such an object, according to the first aspect of the present invention, a plurality of openings are formed in the cylinder head, and a head fastening member for fixing the cylinder head to the cylinder block is exposed to the outside through the openings. The engine is configured such that the plurality of openings are detachably covered with a cover.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect, each of the openings is formed such that the opening surface is inclined with respect to the cylinder axis.

  According to a third aspect of the present invention, in addition to the configuration of the first or second aspect, a cam shaft is disposed on the cylinder head, and the head fastening members are disposed on both sides of the cam shaft. In addition, the opening is formed.

  According to a fourth aspect of the present invention, in addition to the configuration according to any one of the first to third aspects, a plurality of the head fastening members are disposed in the one opening.

  According to a fifth aspect of the present invention, in addition to the configuration according to any one of the first to fourth aspects, an insertion hole into which a tightening bolt as the head fastening member is inserted is an oil passage. .

  According to a sixth aspect of the present invention, in addition to the configuration according to any one of the first to fifth aspects, the head fastening member and the intake / exhaust valve are arranged on a substantially straight line, and the head fastening member and the suction An exhaust valve is provided at a position facing the outside from the opening, and the cover is a tappet adjustment cover, and the tappet adjustment is made possible by removing the tappet adjustment cover.

  According to the first aspect of the present invention, since the head fastening member can be attached and detached through the opening by removing the cover, the fastening bolt can be shortened, the axial force can be stabilized, and the height of the engine Can be lowered. Further, by forming a plurality of openings, it is possible to ensure the rigidity of the cylinder head as compared with the case of forming one large opening.

  According to the second aspect of the present invention, since each of the openings is formed such that the opening surface is inclined with respect to the cylinder axis, the tool is inserted through the oblique opening, so that the head fastening member is moved to the side. Since it can be operated from the side, the detachability can be improved.

  According to the invention described in claim 3, since the camshaft is disposed in the cylinder head and the head fastening member and the opening are formed on both sides of the camshaft, the base material of the cylinder head is camped. Since the shaft bearings are connected, the rigidity can be improved.

  According to the invention described in claim 4, since the plurality of head fastening members are disposed in one opening, the plurality of head fastening members can be attached and detached by removing one cover, and workability is improved. It is good.

  According to the fifth aspect of the present invention, the structure of the cylinder block or the like can be simplified by using the insertion hole through which the tightening bolt as the head fastening member is inserted as the oil passage. The oil may leak to the outside, but the tightening bolt is covered with a cover, so oil can be prevented from leaking to the outside of the engine (outside of the cylinder head), and the tightening bolt head seal can be simplified or eliminated. Is possible.

  According to the invention described in claim 6, the head fastening member and the intake / exhaust valve are arranged in a substantially straight line, and the head fastening member and the intake / exhaust valve are located at a position facing the outside from the opening. Since the cover is a tappet adjustment cover, and the tappet adjustment cover can be adjusted by removing the tappet adjustment cover, the tappet adjustment cover can also be used for attaching and detaching the head fastening member. The above effects can be obtained without increasing.

  Embodiments of the present invention will be described below.

  1 to 3 show an embodiment of the present invention.

  First, the configuration will be described. Reference numeral 11 in FIG. 1 is a single-cylinder four-cycle, four-valve engine disposed in a motorcycle. The engine 11 is provided with a crankshaft 12, and a connecting rod 13 is connected to the crankshaft 12. The piston 14 is connected via

  When the piston 14 moves up and down in the cylinder block 15, the crankshaft 12 is rotated via the connecting rod 13.

  A cylinder head 16 is disposed above the cylinder block 15, and a camshaft 19 having a cam portion 19 a is rotatably supported on the cylinder head 16 via bearings 17 and 18. The shaft 19 is connected to the crankshaft 12 via a cam chain (not shown) and is rotated.

  One end portions 20 a and 21 a of the intake side rocker arm 20 and the exhaust side rocker arm 21 are brought into contact with the camshaft 19, while the other end portions 20 b and 21 b are brought into contact with the intake valve 22 and the exhaust valve 23. It has become. Thus, when the camshaft 19 is rotated, the rocker arms 20 and 21 are swung around the rotation shafts 20c and 21c, and the valves 22 and 23 are operated at a predetermined timing, so that the intake passage is provided. 24 and the exhaust passage 25 are configured to be opened and closed.

  Four intake valves 22 and two exhaust valves 23 are arranged on each side of the camshaft 19 in total, and a substantially rectangular opening 16b is formed above the two intake valves 22, and this opening 16b. The two intake valves 22 are configured to face the outside, and a tappet adjustment cover 26 as a “cover” is detachably disposed in the opening 16 b by a mounting screw 30. A substantially rectangular opening 16c is formed on the upper side of the two exhaust valves 23. The two exhaust valves 23 face the outside from the opening 16c, and a "cover" is provided in the opening 16c. The tappet adjustment cover 27 is detachably disposed by a mounting screw 30 (see FIG. 1).

  In these tappet adjustment covers 27 and 28, on both sides of the camshaft 19, as shown in FIGS. 2 and 3, two stud bolts 31 and tightening nuts 32 as "head fastening members" are arranged. The cylinder head 16 is attached to the cylinder block 15 by the stud bolt 31 and the tightening nut 32.

  That is, an insertion hole 15 a is formed in the cylinder block 15, and the stud bolt 31 is protruded from the cylinder block 15 by inserting and fixing the stud bolt 31 as a “tightening bolt” into the insertion hole 15 a. Yes. The stud bolt 31 is inserted into the insertion hole 16 a of the cylinder head 16 and is arranged in parallel with the cylinder axis O. The cylinder head 16 is attached to the cylinder block 15 by screwing a fastening nut 32 to the stud bolt 31.

  The two stud bolts 31 and the two intake valves 22 arranged between the stud bolts 31 are arranged on a substantially straight line, and are arranged between the two stud bolts 31 and the stud bolts 31. Two exhaust valves 23 are arranged on a substantially straight line.

  The two stud bolts 31 and the two intake valves 22 arranged in a substantially straight line are exposed to the outside through one rectangular opening 16b, and the tappet adjusting cover 26 attached to the opening 16b. Covered by.

  Further, two stud bolts 31 and two exhaust valves 23 arranged in a substantially straight line are exposed to the outside through one rectangular opening 16c, and a tappet adjusting cover 27 attached to the opening 16c is used. Covered.

  Accordingly, when the tappet adjusting covers 26 and 27 are removed, the tightening nut 32 faces the outside, so that the tightening nut 32 can be attached and detached. By removing the tightening nut 32, the cylinder head 16 Can be removed from the cylinder block 15. Further, the tappet adjustment can be performed by removing the tappet adjustment covers 26 and 27.

  An oil passage through which lubricating oil flows is formed between the stud bolt 31 and the cylinder head insertion hole 15a and the cylinder block insertion hole 16a.

  Further, as shown in FIG. 3, a sprocket 34 to which the cam chain is hung is fixed to the left end portion of the camshaft 19 in the figure, and a breather rotating body 36 of a breather device 35 is attached to the sprocket 34. A breather fixing body 37 is disposed to face the breather rotating body 36.

  Furthermore, a water pump device 41 having an impeller shaft 39 and an impeller 40 is disposed on the left side of the breather device 35 in the drawing. The impeller shaft 39 is fitted into a bolt 42 attached to the camshaft 19, so that the impeller 40 rotates as the camshaft 19 rotates.

  In such a case, the stud bolt 31 and the tightening nut 32 are arranged in the tappet adjustment covers 26 and 27 so that the head of the tightening bolt is exposed unlike the conventional case. 31 can be shortened, the axial force can be stabilized, and the height of the engine 11 can be lowered.

  In addition, since the openings 16b and 16c are formed so that the opening surfaces are inclined with respect to the cylinder axis O, when inserting a tool from the oblique openings 16b and 16c and attaching and detaching the tightening nut 32, Easy to operate. Of course, the tappet adjustment described later is easy.

  Since the openings 16b and 16c are formed on both sides of the camshaft 19, the base material of the cylinder head 16 connects the bearings 17 and 18 of the camshaft 19, so that the rigidity can be improved. .

  Further, since a plurality of sets (two sets in this case) of stud bolts 31 and tightening nuts 32 are arranged in one opening 16b or 16c, a plurality of tightening nuts 32 are attached and detached by removing one cover 26 or 17. And workability is good.

  Furthermore, the structure of the cylinder block 15 and the cylinder head 16 can be simplified by using the insertion holes 15a and 16a through which the stud bolts 31 are inserted as oil passages. Moreover, there is a possibility that oil leaks to the outside through this oil passage. However, since the stud bolt 31 and the fastening nut 32 are covered with the tappet adjustment covers 26 and 27, the oil is supplied to the engine 11 (cylinder head 16). Can be prevented from leaking to the outside, and the cylinder head 16 can be prevented from being soiled. Therefore, the seal of the stud bolt 31 and the tightening nut 32 can be simplified or eliminated.

  In this embodiment, the “cover” is the tappet adjustment covers 26, 27. Since the tappet adjustment covers 26, 27 can be removed by removing the tappet adjustment covers 26, 27, the tappet adjustment covers 26, 27 are removed. Since the tightening nut 32 can be attached and detached by removing, the above effect can be obtained without increasing the number of parts. Incidentally, the tappet adjustment is performed by opening the tappet adjustment covers 26 and 27 and adjusting the screws 20d and 21d provided on the other end portions 20b and 21b of the rocker arms 20 and 21.

  In the above embodiment, the present invention is applied to the engine 11 for a motorcycle. However, the present invention can also be applied to an engine used for other purposes. Also, the type of engine is not limited to a single-cylinder, 4-valve type, but may be any other type as long as a tightening bolt or a tappet adjustment cover is used.

It is sectional explanatory drawing cut | disconnected in the direction orthogonal to the crankshaft of the engine which concerns on embodiment of this invention. It is sectional explanatory drawing cut | disconnected in the direction parallel to the crankshaft of the engine which concerns on the embodiment. It is a top view which shows the rocker arm etc. of the engine which concerns on the same embodiment.

Explanation of symbols

11 engine
12 Crankshaft
13 Connecting rod
14 Piston
15 Cylinder block
15a Insertion hole
15b Female thread
16 Cylinder head
16a Insertion hole
19 Camshaft
19a Cam part
20 Intake side rocker arm
21 Exhaust side rocker arm
22 Intake valve
23 Exhaust valve
24 Air intake passage
25 Exhaust passage
26,27 Tappet adjustment cover (cover)
31 Stud bolt (clamping bolt / head fastening member)
32 Tightening nut (head fastening member)

Claims (6)

  A plurality of openings are formed in the cylinder head, and a head fastening member for fixing the cylinder head to the cylinder block is exposed to the outside through the openings, and the plurality of openings are detachable by a cover. An engine characterized by being covered.   The engine according to claim 1, wherein each opening is formed such that an opening surface is inclined with respect to a cylinder axis.   The camshaft is disposed on the cylinder head, the head fastening member is disposed on both sides of the camshaft, and the opening is formed. engine.   The engine according to any one of claims 1 to 3, wherein a plurality of the head fastening members are disposed in the one opening.   The engine according to any one of claims 1 to 4, wherein an insertion hole into which a tightening bolt as the head fastening member is inserted is an oil passage. The head fastening member and the intake / exhaust valve are arranged in a substantially straight line, and the head fastening member and the intake / exhaust valve are provided at positions facing the outside from the opening,
The engine according to any one of claims 1 to 5, wherein the cover is a tappet adjustment cover, and the tappet adjustment is made possible by removing the tappet adjustment cover.

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