JP3986782B2 - Engine valve mechanism - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cam interlocked with a crankshaft, a rocker shaft rotatably supported in a bearing hole of an engine body, a cam follower fixed to one end portion of the rocker shaft and slidingly contacting a tip portion with the cam, The present invention relates to a valve operating mechanism for an engine and a method for assembling the same, comprising a rocker arm fixed to the other end of a shaft and having a tip end connected to a valve mounted on the engine body.
[0002]
[Prior art]
Such an engine valve mechanism has been proposed by the present applicant (see Japanese Patent Application No. 2000-276659). According to this mechanism, a relatively large-diameter cam is arranged on one side of the engine body, In addition, a rocker arm and a rocker shaft with a relatively small diameter are placed directly above the engine body, thereby suppressing the bulkiness of the valve mechanism upward, reducing the overall height of the engine, and eventually reducing the size of the engine. Can do.
[0003]
[Problems to be solved by the invention]
In such a valve operating mechanism, the cam follower and the rocker arm around the axis of the rocker shaft must be in proper phase so that the valve can be opened and closed properly.
[0004]
Therefore, the present invention provides an engine valve mechanism and an assembling method thereof, in which a cam follower and a rocker arm can be fixed to a rocker shaft with an appropriate phase, and whether or not their mutual phases are appropriate can be confirmed. For the purpose.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a cam interlocking with a crankshaft, a rocker shaft rotatably supported in a bearing hole of an engine body, and a cam at a tip portion fixed to one end portion of the rocker shaft. And a rocker arm fixed to the other end portion of the rocker shaft so as to maintain a predetermined phase with the cam follower and having a tip portion connected to a valve mounted on the engine body. The mechanism has first and second contact surfaces formed on the cam follower and the rocker arm, respectively, and first and second reference surfaces on which the first and second contact surfaces simultaneously contact each other are formed on the engine body. Is the first feature.
[0006]
According to this first feature, the phase around the rocker shaft between the cam follower and the rocker arm can be set and confirmed properly by bringing their abutment surfaces into contact with the reference surface of the engine body during assembly. Therefore, the valve can be opened and closed in a timely manner by the rotation of the cam.
[0007]
Further, according to the present invention, in assembling the valve operating mechanism of the engine having the first feature, a rocker shaft whose one end is press-fitted into one of the cam follower and the rocker arm is fitted into the bearing hole, and one contact surface of the cam follower and the rocker arm is fitted. In the state in which the first and second rockers are in contact with the corresponding reference surface, the other of the cam follower and the rocker arm is pressed into the other end of the rocker shaft while the other contact surface is in contact with the corresponding reference surface. It is characterized by.
[0008]
According to the second feature, the cam follower and the rocker arm can be coupled to the rocker shaft, and at the same time, their proper phases can be confirmed, so that both quality and productivity can be satisfied.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described based on examples of the present invention shown in the accompanying drawings.
[0010]
1 is a longitudinal side view of an engine having a valve mechanism of the present invention, FIG. 2 is an exploded view of the main part of FIG. 1, FIG. 3 is a sectional view taken along line 3-3 of FIG. FIG. 5 is a sectional view taken along line 5-5 in FIG. 4, FIG. 6 is a sectional view taken along line 6-6 in FIG. 4, and FIG. 7 is a view corresponding to FIG. FIG. 8 is also a view corresponding to FIG. 6 showing the assembly method of the valve operating mechanism, FIG. 9 is a front view of the driven pulley / cam combined body in the valve operating mechanism, and FIG. 10 is a sectional view taken along line 10-10 in FIG. 11 is a cross-sectional view taken along line 11-11 of FIG.
[0011]
1 to 4 and 6, the engine body 1 of the engine E opens to the crankcase 2 having a crank chamber 2 a, the cylinder block 3 having one cylinder bore 3 a, the combustion chamber 5, and the chamber 5. The cylinder head 4 has intake and exhaust ports 6 and 7.
[0012]
The crankshaft 10 accommodated in the crank chamber 2 a is supported via left and right side wall bearings 11, 11 ′ of the crankcase 2.
[0013]
An oil tank 12 adjacent to the outside is integrally connected to the left side wall of the crankcase 2, and one end of the crankshaft 10 penetrates the oil tank 12 in an oil-tight manner.
[0014]
A belt guide tube 13 having a flat cross section extending in the vertical direction so as to penetrate therethrough is integrally provided on the ceiling wall of the oil tank 12. The lower end of the belt guide tube 13 extends to the vicinity of the crankshaft 10 in the oil tank 12 and the upper end is integrally connected to the cylinder head 4 so as to share the cylinder head 4 and the partition wall 14. Established. A series of annular seal beads 15 are formed on the upper peripheral edges of the cylinder head 4 and the belt guide tube 13, and the partition wall 14 projects upward from the seal beads 15.
[0015]
An annular seal groove 16 corresponding to the seal bead 15 is connected to the lower end surface of the head cover 8 coupled to the upper end of the cylinder head 4, and both sides of the annular seal groove 16 are connected to the inner surface of the cover 8. A linear seal groove 17 is formed, an annular packing 18 is attached to the annular seal groove 16, and a linear packing 19 integrally formed with the annular packing 18 is attached to the linear seal groove 17. The head cover 8 is bolted to the cylinder head 4 so that the seal bead 15 is in pressure contact with the annular packing 18 and the partition wall 14 is in pressure contact with the linear packing 19.
[0016]
Thus, a first valve chamber 21a is defined by the belt guide tube 13 and one half of the head cover 8, and a second valve chamber 21b is defined by the cylinder head 4 and the other half of the head cover 8. The two valve chambers 21 a and 21 b are partitioned by the partition wall 14.
[0017]
In the cylinder head 4, an intake valve 22i and an exhaust valve 22e that open and close the intake port 6 and the exhaust port 7, respectively, are arranged in parallel to the axis of the cylinder bore 7a.
[0018]
Next, the valve mechanism 23 according to the present invention for opening and closing the intake valve 22i and the exhaust valve 22e will be described.
[0019]
1 to 6, the valve mechanism 23 includes a timing transmission device 23a disposed from the oil tank 12 to the first valve chamber 21a, and the first valve chamber 21a to the second valve chamber 21b. And a cam device 23b disposed over the entire area.
[0020]
The timing transmission device 23a includes a driving pulley 24 fixed to the crankshaft 13 in the oil tank 12, a driven pulley 25 rotatably supported on the upper portion of the belt guide cylinder 13, and the driving and driven pulleys 24, It consists of a timing belt 26 wound around 25. A hub 30 and a cam 29 are integrally formed on the driven pulley 25, thereby forming a driven pulley / cam combined body 50. In this way, the cam 29 is arranged with the driven pulley 25 on one side of the cylinder head 4. The driving and driven pulleys 24 and 25 are toothed, and the driving pulley 24 drives the driven pulley 25 through the belt 26 with a reduction ratio of 1/2.
[0021]
A support wall 27 is integrally formed on the outer wall of the belt guide tube 13 so as to stand up on the inner side of the annular seal bead 15 and come into contact with or close to the inner surface of the head cover 8. Both ends of the support shaft 39 are rotatably supported by the hole 28 a and the bottomed hole 28 b provided in the partition wall 14, and the hub 30 is rotatably supported by an intermediate portion of the support shaft 39. The support shaft 39 is inserted into the shaft hole 35 and the bottomed hole 28b of the driven pulley 25 and the cam 29 from the through hole 28a before the head cover 8 is attached. After the insertion, the head cover 8 is inserted into the cylinder head 4 When joined to the belt guide tube 13, the inner surface of the head cover 8 faces the outer end of the support shaft 39 so as to prevent it from coming off.
[0022]
The cylinder head 4 is integrally formed with a pair of bearing bosses 31i and 31e protruding in parallel with the support shaft 39 on the side of the second valve chamber 21b from the partition wall 14, and the cam device 23b includes the cam 29, An intake rocker shaft 33i and an exhaust rocker shaft 33e rotatably supported in bearing holes 32i and 32e of the bearing bosses 31i and 31e, respectively, and a first valve chamber 21a are press-fitted into one ends of the rocker shafts 33i and 33e, respectively. The intake cam follower 34i and the exhaust cam follower 34e that extend toward the cam 29 and the intake valve that is press-fitted into the other ends of the intake and exhaust rocker shafts 33i and 33e in the second valve chamber 21b and extends toward the intake valve 22i and the exhaust valve 22e. Mounted on the rocker arm 35i and the exhaust rocker arm 35e, the intake valve 22i and the exhaust valve 22e, respectively, in the valve closing direction It consists the energization to the intake spring 38i and an exhaust spring 38e. The intake cam follower 34i and the exhaust cam follower 34e are arranged so that the slipper surfaces 36, 36 formed on the upper surfaces of the tip portions thereof are in sliding contact with the lower surface of the cam 29, and the intake rocker arm 35i and the exhaust rocker arm 35e are arranged at their tips. The adjustment bolts 37, 37 screwed to the respective portions are arranged so as to abut on the upper ends of the intake valve 22i and the exhaust valve 22e, respectively.
[0023]
The support shaft 39 and the intake and exhaust rocker shafts 33 i and 33 e are disposed above the annular seal beads 15 at the upper ends of the cylinder head 4 and the belt guide cylinder 13. Therefore, when the head cover 8 is removed, the support shaft 39 and the intake and exhaust rocker shafts 33i and 33e can be assembled and disassembled without being disturbed by the seal bead 15, thereby assembling and maintaining. The property is very good.
[0024]
5 to 8, the intake cam follower 34i and the exhaust cam follower 34e are provided with contact surfaces 40i, 40e parallel to the axis of the rocker shafts 33i, 33e on the back surface opposite to the slipper surfaces 36, 36, respectively. In the intake rocker arm 35i and the exhaust rocker arm 35e, contact surfaces 41i and 41e are formed on the back surface opposite to the protruding side of the adjusting bolts 37 and 37. On the other hand, when the intake cam follower 34i and the intake rocker arm 35i are rotated outward from the cylinder head 4, reference surfaces 42i and 42e are formed on the cylinder head 4 so as to face the contact surfaces 40i and 40e, respectively. When the exhaust cam follower 34e and the exhaust rocker arm 35e are rotated outward of the cylinder head 4, reference surfaces 43i and 43e that face the contact surfaces 41i and 41e, respectively, are formed.
[0025]
Thus, if the phase around the intake rocker shaft 33i between the intake cam follower 34i and the intake rocker arm 35i is appropriate, the contact surfaces 40i, 41i and the reference surfaces 42i, 43i are simultaneously in contact with each other, and the exhaust cam follower 34e and the exhaust If the phase around the rocker arm 35e around the exhaust rocker shaft 33e is appropriate, the contact surfaces 40e and 41e and the reference surfaces 42e and 43e are in contact with each other simultaneously. All the reference surfaces 42i, 42e, 43i, 43e are arranged at the same height so as to enable simultaneous processing thereof.
[0026]
When assembling the intake cam follower 34i and the intake rocker arm 35i to the intake rocker shaft 33i, first, for example the intake cam follower 34i and secured by press-fitting one end portion of the rocker shaft 33 i of the bearing hole 32 and the rocker shaft 33 i i after fitting inserted in the reference plane 42 as shown in FIG. 7 (B) and FIG. 8 (B), the which rotates the intake cam follower 34i outside of the cylinder head 4, corresponding its abutment surface 40 i If the intake rocker arm 35i is fixed to the other end portion of the rocker shaft 33i with the contact surface 41i being in contact with the corresponding reference surface 43i while being in contact with i , the intake cam follower is fixed. The phase around the intake rocker shaft 33i between the 34i and the intake rocker arm 35i can be set appropriately. Of course, the phase around the exhaust rocker shaft 33e between the exhaust cam follower 34e and the exhaust rocker arm 35e can be set appropriately in the same manner. The same applies when the rocker arms 35i and 35e are first press-fitted into the rocker shafts 33i and 33e. After the assembly, as shown in FIGS. 7A and 8A, the cam followers 34i and 34e and the rocker arms 35i and 35e are rotated to the use position on the center side of the cylinder head 4.
[0027]
4 and 5, an auxiliary spring 45i that urges the intake cam follower 34i and the exhaust cam follower 34e in the direction of action of the intake spring 38i and the exhaust spring 38e between the cylinder head 4 and the intake cam follower 34i and the exhaust cam follower 34e. , 45e. Each auxiliary spring 45i, 45e is a torsion coil spring, and the coil portion 46 is fitted on the outer periphery of the corresponding rocker shaft 33i, 33e, and the fixed end portion 47 is attached to the locking portion 49 of the cylinder head 4. The movable end 48 is locked and connected to the corresponding cam follower 34i, 34e so as to bias it upward.
[0028]
9 to 11, the cam 29 is integrally formed of a sintered alloy together with a cylindrical hub 30 that is rotatably supported by a support shaft 39. At this time, the hub 30 is disposed so as to protrude from one end surface of the cam 29, a chamfered portion 30 a is formed on the outer peripheral surface of the tip end portion, and a recess surrounding the hub 30 is formed on one end surface of the cam 29. 51 and a radial protrusion 52 protruding from the bottom surface of the recess 51 are formed. The recess 51 has a shape whose inner peripheral surface is substantially similar to the outer peripheral surface of the cam 29, whereby the thickness of the cam 29 around the recess 51 is set to be substantially constant.
[0029]
The driven pulley 25 made of synthetic resin is mold-coupled to the hub 30 and the cam 29. At that time, the outer peripheral surface of the hub 30 is wrapped with the chamfered portion 30a by the material of the driven pulley 25, that is, the synthetic resin, and the concave portion 51 of the cam 29 is filled. Thus, the driven pulley / cam combined body 50 is configured.
[0030]
1 and 2 again, the oil tank 12 stores a predetermined amount of lubricating oil O injected from the oil supply port 12a. In the oil tank 12, a pair of oil slinger 55a, 55b arranged in the axial direction with the drive pulley 24 interposed therebetween is fixed to the crankshaft 13 by press fitting or the like. These oil slinger 55a and 55b are directed to opposite radial directions and bent so that their tips are separated from each other in the axial direction. When the oil slinger 55a and 55b are driven to rotate by the crankshaft 13, At least one of the oil slinger 55a and 55b stirs and scatters the stored oil O in the oil tank 12 to generate oil mist. At this time, the generated oil mist enters the first valve chamber 21a from the oil tank 12 and lubricates the timing transmission device 23a, while circulating to the crank chamber 6a, the second valve chamber 21b, and the oil tank 12. Thus, each part in the crank chamber 2a and the cam device 22b are lubricated.
[0031]
Next, the operation of this embodiment will be described.
[0032]
When the crankshaft 10 rotates, the driving pulley 24 that rotates together with the crankshaft rotates the driven pulley 25 and the cam 29 via the belt 26, and the cam 29 swings the intake and exhaust cam followers 34i and 34e in a timely manner, The movement is transmitted to the intake and exhaust rocker arms 35i and 35e through the corresponding rocker shafts 33i and 33e to swing them, so that the intake and exhaust valves are operated in cooperation with the intake and exhaust springs 38i and 38e. 22i and 22e can be opened and closed in a timely manner.
[0033]
During this time, the cam 29 and the hub 30 are lubricated by the oil mist generated in the oil tank 12, but the cam 29 and the hub 30 are made of a sintered alloy having innumerable cavities. The oil is held in the cavity, and the sliding contact portions with the cam followers 34i and 34e and the rotational sliding portion with the support shaft 39 can be effectively lubricated, contributing to the improvement of their durability. obtain.
[0034]
In addition, the hub 30 is rotatably supported by the support shaft 39, and the support shaft 39 is also rotatably supported by the both side walls of the first valve chamber 21a. Therefore, during the rotation of the driven pulley 25 and the cam 29, friction occurs. The support shaft 39 is also rotated by being dragged by the rotation, the difference in rotational speed between the hub 30 and the support shaft 39 is reduced, and the wear of the rotating sliding portion can be reduced, and the durability thereof is further improved. Can contribute.
[0035]
Further, since the driven pulley 25 driven from the driving pulley 24 via the belt 26 is made of synthetic resin, the driven pulley 25 is relatively light in spite of its relatively large diameter, and the driven pulley / cam combined body 50 is lightweight. Can contribute to weight reduction of the engine E.
[0036]
In addition, since the driven pulley 25 is molded and bonded to the cam 29 and the hub 30, the driven pulley / cam combined body 50 can be formed without using any special fixing member, and the combined body 50 can be further reduced in weight. Can contribute to the development.
[0037]
Further, when the driven pulley 25 is molded to the cam 29 and the hub 30, the material of the driven pulley 25, that is, a synthetic resin, wraps the outer peripheral surface of the hub 30 together with the chamfered portion 30 a and fills the concave portion 51 of the cam 29. The coupling force in the rotational direction and the axial direction between the pulley 25, the hub 30 and the cam 29 can be enhanced.
[0038]
In particular, since the concave portion 51 has a shape substantially similar to the outer peripheral surface of the cam 29, the coupling force in the rotational direction of the driven pulley 25 and the cam 29 can be effectively increased. Since the thickness of 29 is substantially constant, thermal distortion during the sintering of the cam 29 can be suppressed, which can contribute to improving the accuracy of the cam profile.
[0039]
On the other hand, as the base circles of the intake cam 29 and the exhaust cam 29 face the intake cam follower 34i and the exhaust cam follower 34e and release the downward pressing force on them, the intake valve 22i and the exhaust valve 22e are inhaled. When the valve 38 is closed by the urging force of the spring 38i and the exhaust spring 38e, the rocker arms 35i, 35e are pushed upward by the intake valve 22i and the exhaust valve 22e and swing around the axis of the rocker shafts 33i, 33e. One end of each rocker shaft 33i, 33e is pushed up to try to apply a couple to each rocker shaft 33i, 33e.
[0040]
However, an upward pressing force is always applied to the other end side of the rocker shafts 33i, 33e by the urging force of the auxiliary springs 45i, 45e connected to the cam followers 34i, 34e. Power is countered. As a result, the rocker shafts 33i and 33e are entirely pressed against the upper surfaces of the bearing holes 32i and 32e, so that play due to couples can be avoided in advance and abnormal noise and tapping wear can be prevented. Can do.
[0041]
By the way, the relatively large-diameter cam 29 is disposed on one side of the cylinder head 4 together with the driven pulley 25, and the intake and exhaust rocker arms 35i and 35e and the relatively small-diameter intake and exhaust rocker shaft 33i are directly above the cylinder head 4. , 33e is not disposed, the valve operating mechanism 23 is not greatly bulky above the cylinder head 4, and the overall height of the engine E can be reduced, and the engine E can be made compact.
[0042]
Further, the cam followers 34i, 34e and the rocker arms 35i, 35e fixed to both ends of the rocker shafts 33i, 33e are arranged so that their contact surfaces 40i, 40e, 41i, 41e are connected to the reference surfaces 42i, 42i of the cylinder head 4, respectively. Since the phases around the rocker shafts 33i, 33e are set appropriately in contact with the surfaces 42e, 43i, 43e, the intake and exhaust valves 22i, 22e can be opened and closed with good timing by the rotation of the cam 29.
[0043]
In particular, at the time of assembly, as described above, for example, the cam followers 34i and 34e are press-fitted into one end of the rocker shafts 33i and 33e, and the rocker shafts 33i and 33e are inserted into the bearing holes 32i and 32e of the bearing bosses 31i and 31e. Thereafter, when the rocker arms 35i and 35e are press-fitted into the other end portions of the rocker shafts 33i and 33e, the rocker arms 35i and 35e are brought into contact with the corresponding reference surfaces 42i and 42e, respectively. Since the abutting surfaces 41i and 41e of the 35e are brought into contact with the corresponding reference surfaces 43i and 43e and press-fitted, the cam followers 34i and 34e and the rocker arms 35i and 35e are coupled to the rocker shafts 33i and 33e at the same time. The phase can be checked and both quality and productivity can be satisfied.
[0044]
The present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the scope of the gist thereof.
[0045]
【The invention's effect】
As described above, according to the first feature of the present invention, the cam interlocked with the crankshaft, the rocker shaft rotatably supported in the bearing hole of the engine body, and the tip fixed to one end of the rocker shaft An engine that includes a cam follower that slides in contact with the cam, and a rocker arm that is fixed to the other end of the rocker shaft so as to maintain a predetermined phase with the cam follower and that has a tip connected to a valve mounted on the engine body. The first and second contact surfaces are respectively formed on the cam follower and the rocker arm, and the first and second reference surfaces on which the first and second contact surfaces simultaneously contact are formed on the engine body. since the formed, the cam follower and the phase around the rocker shaft of the rocker arm each other, during assembly, by their contact surface that is brought into contact with the reference surface of the engine body, properly set, confirm child Can be can be, therefore timely opening and closing the valve by rotation of the cam.
[0046]
According to the second feature of the present invention, in assembling the valve operating mechanism of the engine having the first feature, the rocker shaft having one end pressed into one of the cam follower and the rocker arm is fitted into the bearing hole, and the cam follower and With one abutting surface of the rocker arm in contact with the corresponding reference surface, the other of the cam follower and the rocker arm is brought into contact with the corresponding reference surface at the other end of the rocker shaft.ゝ Because of the press fit, the cam follower and the rocker arm can be coupled to the rocker shaft, and at the same time, their proper phase can be confirmed, satisfying both quality and productivity.
[Brief description of the drawings]
FIG. 1 is a vertical side view of an engine having a valve mechanism of the present invention.
FIG. 2 is an exploded view of the main part of FIG.
3 is a cross-sectional view taken along line 3-3 in FIG.
4 is a cross-sectional view taken along line 4-4 of FIG. 3;
5 is a cross-sectional view taken along line 5-5 in FIG.
6 is a sectional view taken along line 6-6 of FIG.
FIG. 7 is a view corresponding to FIG. 5, showing an assembling method of the valve mechanism.
FIG. 8 is a view corresponding to FIG. 6 showing an assembling method of the same valve mechanism.
FIG. 9 is a front view of a driven pulley / cam combination in the valve mechanism.
10 is a sectional view taken along line 10-10 in FIG. 9;
11 is a sectional view taken along line 11-11 in FIG.
[Explanation of symbols]
E ... Engine 1 ... Engine body 10 ... Crankshaft 22i ... Valve (intake valve)
22e ... ・ Valve (exhaust valve)
29... Cam 23... Valve mechanism 23 a... Timing transmission device 23 b... Cam device 29.・ Bearing hole 33i ... Rocker shaft (intake rocker shaft)
33e ... Rocker shaft (exhaust rocker shaft)
34i ... Cam follower (intake cam follower)
34e ··· Cam follower (exhaust cam follower)
35i ... Rocker arm (intake rocker arm)
35e ... Rocker arm (exhaust rocker arm)
40i ... Contact surface (intake cam follower)
40e ... Contact surface (exhaust cam follower)
41i ··· Contact surface (of intake rocker arm)
41e ... Contact surface (exhaust rocker arm)
42i... Reference surface (corresponding to the contact surface 40i)
42e .... Reference surface (corresponding to the contact surface 40e)
43i .... Reference surface (corresponding to the contact surface 41i)
43e .... Reference surface (corresponding to the contact surface 41e)

Claims (2)

A cam (29) interlocked with the crankshaft (10), a rocker shaft (33i, 33e) rotatably supported in a bearing hole (32i, 32e) of the engine body (1), and the rocker shaft (33i, 33e) ) And a cam follower (34i, 34e) whose end is in sliding contact with the cam (29 ) and a predetermined phase between the cam follower (34i, 34e) at the other end of the rocker shaft (33i, 33e). A valve operating mechanism for an engine comprising a rocker arm (35i, 35e) fixed to be maintained and having a tip portion connected to a valve (22i, 22e) attached to the engine body (1),
First and second contact surfaces (40i, 40e; 41i, 41e) are formed on the cam follower (34i, 34e) and the rocker arm (35i, 35e), respectively, and these first and second contact surfaces (40i, 40e; 41. A valve operating mechanism for an engine, characterized in that first and second reference surfaces (42i, 42e; 43i, 43e) with which 41i, 41e) simultaneously contact each other are formed on the engine body (1) . In assembling the engine valve mechanism according to claim 1,
A rocker shaft (33i, 33e) whose one end is press-fitted into one of the cam follower (34i, 34e) and the rocker arm (35i, 35e) is fitted into the bearing hole (32i, 32e), and the cam follower (34i, 34e) and the rocker arm ( 35i, 35e) with one contact surface (40i, 40e) in contact with the corresponding reference surface (42i, 42e), the cam follower (34i, 34e) on the other end of the rocker shaft (33i, 33e). ) And the rocker arm (35i, 35e), and the other abutment surface (41i, 41e) is brought into contact with the corresponding reference surface (43i, 43e) and press-fitted. Assembling method of valve mechanism.

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