JPH0332533A - Locker shaft unit assembly device - Google Patents

Abstract

PURPOSE:To automate the assembly of a locker shaft unit by making a constitution in which each dummy shaft is pulled out by putting each locker shaft into each furnishing hole under pressure, and each locker shaft is inserted to a predetermined insertion position within each furnishing hole. CONSTITUTION:Each locker shaft furnishing component is transported in order under a condition in which each is arranged in a predetermined order, from a coil spring supply device 22, each supply device 23a, 23b for a pair of locker arms and a cam cap supply device 24 to the topside of a transport passage 21. At the terminal end portion of the transport passage 21, each dummy shaft 47a, 47b whose diameter is smaller than that of the locker shaft, is inserted into the inside of the furnishing hole of each locker shaft furnishing component, and each furnishing component is marshaled, and then, dummy shafts 47a, 47b are pulled out from furnishing holes by putting respective regular locker shafts into furnishing holes under pressure, and it is constituted so that each locker shaft may be inserted to a predetermined insertion position within each furnishing hole.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a rocker shaft unit assembly device mounted on an overhead camshaft type engine body.

(Prior Art) Generally, an engine body equipped with an overhead force I-(OHC) type valve mechanism is known as an engine for a vehicle such as an automobile. This OHC type valve mechanism has a configuration as shown in FIG. 16. In FIG. 16, 1 is a cylinder block, and 2 is a cylinder head disposed on this cylinder block l.

This cylinder head 2 is provided with a camshaft 3, and a rocker shaft 4.4 is arranged parallel to the upper part of the camshaft 3. These rocker shafts 4.4 are provided with rocker arms 5.5 that are rotationally driven by the camshaft 3, and these rocker arms 5, 5 drive the intake valve 6 and the exhaust valve 7 to open and close. It looks like this.

Further, each rocker shaft 4 has a plurality of rocker arms 5, for example, in an OHC type valve mechanism in which one intake valve 6 and one exhaust valve 7 are installed in one cylinder, each rocker shaft 4 has a plurality of rocker arms 5. The number of rocker arms 5 corresponds to the number of cylinders in the engine body. For example, in a three-cylinder engine body, three rocker arms 5 are provided on each rocker shaft 4, as shown in FIG.
is installed. Further, on each rocker shaft 4, along with the plurality of rocker arms 5..., a cam gap 8 of 4 g for attaching each rocker shaft 4, 4 to the cylinder head 2, a pair of adjacent cam caps 8, Various mounting parts such as a coil spring 9 arranged in parallel with the rocker arm 5 are mounted between the rocker arms 8 and the rocker arm 5. When manufacturing the engine body, these plurality of rocker arms 5 are placed on each rocker shaft 4 in advance.
Cam caps 8... Coil springs 9... and other installed parts are arranged in a predetermined order to form a rocker shaft 4 unit A, and then each cam cap 8...
By fixing the cylinder head 2 to the cylinder head 2 with the fixing bolts 10, each rocker shaft 4 and each mounted part such as the plurality of rocker arms 5, cam cap 8, coil spring 9, etc. are connected. It is designed to be integrally attached to the cylinder head 2.

By the way, in the case of the structure described above, the assembly work of the rocker shaft 4 units A involves attaching each installed part such as a plurality of rocker arms 5, cam caps 8, coil springs 9, etc. on each rocker shaft 4. Because there are many types and numbers of parts, it is difficult to automate the process, and traditionally it has been done manually by workers. Therefore, the efficiency of the assembly work is poor, and there is a problem in improving the efficiency of the assembly work of the entire engine body.

(Problem to be Solved by the Invention) A rocker shirt for mounting various mounting parts such as a plurality of rocker arms 5, cam caps 8, coil springs 9, etc. on each rocker shaft 4 of an OHC type valve mechanism. !・Assembling Unit A is difficult to automate and has traditionally been done manually by workers, resulting in poor assembly efficiency.In order to improve the efficiency of assembly of the entire engine body, There was a problem.

This invention was made with attention to the above circumstances, and OHC
It is possible to automate the assembly work of the rocker shaft unit, which attaches various installed parts such as multiple rocker arms, cam caps, and coil springs on the rocker shaft of the type valve mechanism, increasing the work efficiency of the assembly work and improving the overall engine body. An object of the present invention is to provide a rocker shaft unit assembly device that can improve the efficiency of assembly work.

[Structure of the Invention] (Means for Solving the Problems) This invention provides a pair of rocker shafts to be attached to a cylinder head by inserting each of the plurality of cam caps into a hole, and also by inserting a pair of rocker shafts into holes between each pair of adjacent cam caps. In a rocker shaft unit assembly device that forms a rocker shaft unit by mounting rocker arms and coil springs on each rocker shaft, a coil spring supply device and a rocker arm supply device separate and supply fill springs one by one. A supply device for the rocker shaft and a cam cap are sequentially disposed on the conveyance path, and a conveyance mechanism is provided on the conveyance path to sequentially convey the installed parts of the rocker shaft in a predetermined order. At the end of each rocker shaft, insert a dummy shaft with a smaller diameter than the rocker shaft into the mounting hole of the mounting part, align each mounting part, and then press fit each rocker shaft into the mounting hole of each mounting part to form the dummy shaft. A rocker shaft insertion mechanism section is provided for extracting the rocker shaft from the mounting hole of each mounting component and inserting each rocker shaft into a predetermined push-in position in the mounting hole of each mounting component.

(Function) The installed parts of the rocker shaft are sequentially conveyed from the coil spring supply device, the rocker arm supply device, and the cam cap supply device onto the conveyance path in a predetermined order, and at the end of the conveyance path. First, insert a dummy shaft with a smaller diameter than the rocker shaft into the mounting holes of the mounting parts of each rocker shaft and align each mounting part, then press fit each regular rocker shaft into the mounting hole of each mounting part and create a dummy shaft. O
We automate the assembly work of the rocker shaft unit, which attaches various installed parts such as multiple rocker arms, cam caps, and coil springs on the rocker shaft of the HC type valve mechanism, increasing the work efficiency of the assembly work and making it easier to work on the entire engine body. This is designed to improve efficiency.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 15.

FIG. 1 shows a schematic configuration of the entire rocker shaft unit assembly apparatus of the present invention, in which reference numeral 21 denotes a conveyance path for rocker shaft attachment parts formed by, for example, a belt conveyor, and 22 is arranged at the starting end side of this conveyance path 21. This is a supply device for the coil spring 9 provided. Further, on the conveyance passage 21, each supply device 23a of a pair of rocker arms 5.5 (on the intake valve 6 side and the exhaust valve 7 side) is provided.

23b and an O2 supply device 24 for the cam cap 8 are respectively provided, and a ↓1i man mechanism section 25 of the rocker shaft 4 is disposed at the terminal end side of the conveyance passage 21.

Furthermore, FIG. 2 shows a schematic configuration of the coil spring supply device 22. As shown in FIG. This coil spring supply device 22 includes a spring constant supply flapper 26, a spring conveyor belt 27, an elevator front feeder 28, and a supply packet elevator (spring assembly supply means) 29.
, a spring separator 30, a parts feeder 31, and a parts feeder return belt 32. In this case, the spring conveyor belt 27 extends substantially horizontally. A substantially flat spring fixed quantity supply flapper 26 is disposed at the starting end of the spring conveyor belt 27, and an elevator front feeder 28 is disposed at the terminal end thereof, and a fixed quantity of coil springs 9 are supplied from the spring fixed quantity supply flapper 26.・is connected to the elevator front feeder 28 via the spring conveyor belt 27
is supplied to.

The elevator front feeder 28 also has a fixed amount of coil springs 9 supplied via the spring conveyor belt 27.
Packet 29 of packet elevator 29 for supplying...
It leads to a. Further, the supplying packet elevator 29 moves the internal packet 29a up and down to transport a certain amount of coil springs 9 introduced from the inlet at the lower end to the outlet at the upper end, and the spring separator The spring is supplied into the case 34 of the spring separator 30 from the spring insertion port 33 on the top surface of the spring separator 30.

Further, in the case 34 of the spring separator 30, a spring separator body 35 is disposed.

As shown in FIG. 3, this spring separator main body 35 has, for example, two upper and lower rotary plates 36 and 36 arranged approximately horizontally.
is provided. These rotating plates 36, 36 are adapted to be rotationally driven by a drive motor 37. By rotating the rotating plates 36, 36 of the spring separator main body 35 by this drive motor 37, a certain amount of coil springs 9 supplied into the case 34 from the spring insertion port 34 are rotated [36, 36 in the centrifugal direction, the coil springs 9 are brought into contact with the inner peripheral wall surface of the case 34, and the plurality of coil springs 9 are separated.

Furthermore, a parts feeder 31 is disposed below the spring separator 30. This parts feeder 31
The coil spring 9 is sent from the spring separator 30 by vibrating a bottomed cylindrical body 38 with an open top surface.
. . are separated and arranged one by one and continuously supplied to the conveyance path 39 for the next process. In addition, this parts feeder 3
1 is connected to a para feeder return belt 32, and the extra coil springs 9 are connected to the elevator front feeder 2 via this parts feeder return belt 32.
It is now set back to 8.

Moreover, on the transport path 21 for the rocker shaft mounted parts, there are a plurality of pallets 40 for transporting the rocker shaft mounted parts.
...is arranged. The coil springs 9 . . . supplied from the parts feeder 31 of the coil spring supply device 22 via the conveyance path 39 are arranged on these pallets 40 . In this case, as shown in FIG.
It is connected to ゜43. This distributor 41 includes a pair of tube bodies 44a, 44b and these tube bodies 44a.

Connecting portions 44c are provided to connect the portions 44b. One row of coil springs 9, which are continuously supplied via three conveyance paths, are distributed into two rows as the distributor 41 swings, and the pair of branch paths 42, 43 are divided into two rows.
Two rows of coil springs 9...33... are supplied alternately to each pallet 4 through these branch passages 42, 43.
0.

Furthermore, the rocker arm 5 on the intake valve 6 side on the conveyance path 21 of the rocker shaft mounted parts. The three rocker arms 5 on the intake valve 6 side are transferred onto each pallet 40 in the conveyance path 21 from the supply device 23a of..., and the rocker arms 5 on the exhaust valve 7 side are transferred. Similarly, the three rocker arms 5 on the exhaust valve 7 side are transferred onto each pallet 40 in the conveyance path 21 from the supply device 23b of the arms 5.... Also, from the supply device 24 for cam caps 8..., four cam caps 8...
・ is now being transferred. In addition, a supply device 22 for the coil spring 9, a supply device 23a for the rocker arms 5 (on the intake valve 6 side and the exhaust valve 7 side),
The mounting parts of the rocker shafts 4, 4 transferred from the supply device 24 of the rocker shafts 23b and cam caps 8... onto the pallets 40 of the conveyance path 21 are arranged in a predetermined order. It has become. When each pallet 40 is transported to the terminal position of the transport path 21, the mounting parts of the rocker shafts 4, 4 are arranged in a predetermined mounting order.

Further, the rocker shaft pushing mechanism section 25 at the terminal end of the conveyance path 21 is provided with a dummy shaft insertion device 45 and a rocker shaft insertion device 46, which will be described later. As shown in FIG. 5, this dummy shaft insertion device 45 is provided with a pair of dummy shafts 47a and 47b that are slightly smaller in diameter and longer than the rocker shafts 4 and 4 to which a plurality of mounting parts are mounted. These dummy shafts 47a and 47b are attached to a holding block (holding member) 48
It is held movably in the axial direction by. In this case, the holding block 48 is repeatedly driven to circulate on a constant trajectory by a dummy shaft circulation device 49 extending in a direction perpendicular to the axial direction of the dummy shafts 47a and 47b, as shown in FIG. It has become. Further, the rocker shaft insertion device 46 is arranged in a spaced-apart manner in the middle of the circulation orbit of the four dummy shaft circulation devices.

Further, the four dummy shaft circulation devices are rotationally driven by an appropriate drive mechanism 50! A pair of endless conveyance bells) 51a that are arranged opposite each other.

51b is provided. These conveyor belts 51a,
51b has a pair of front and rear support protrusions 52a, 52 that support the timing belt on the inner surface and the holding block 48 on the outer surface.
A plurality of sets of b are formed. Furthermore, the holding block 48 is provided with conveyor belts 51a and 5 as shown in FIG.
A leg portion 53 is formed to protrude toward the 1b side,
The leg portions 53 are the supporting convex portions 5 of the conveyor belts 51a and 51b.
It is inserted between 2a and 52b. Further, a pair of left and right guide rollers 53a, 53 are provided on both sides of the holding block 48.
b are provided respectively. Furthermore, the dummy shaft circulation device 49 includes a guide roller 53 of the holding block 48.
an upper first guide rail 54 that guides a and 53b;
A second guide rail 55 is provided below the first guide rail 54 so as to be spaced apart and facing each other.

At both ends of the second guide rail 55, there are substantially semicircular extensions 55a extending upward.

55b are formed respectively. When the dummy shafts 47a, 47b circulate, the guide rollers 53a, 53b of the holding block 48 are guided between the first guide rail 54 and the second guide rail 55.

Further, a substantially rectangular frame body 56 is provided on the base end side of the dummy shafts 47a, 47b.

The base ends of the dummy shafts 47a and 47b are rotatably mounted on the frame 56. Furthermore, this frame 56
Gears 57a and 57b fixed to the base end of the dummy shaft 47a247b are housed inside the dummy shaft 47a247b. These gears 57a and 57b are held in mesh with each other. Further, a guide roller 58 is provided outside the frame 56. This guide roller 58 is connected to the holding block 48.
The guide rollers 53a and 53b are guided by first and second guide rails 59.60 having the same structure as the first and second guide rails 54.55.

Further, the dummy shaft insertion device 45 is provided with a rotation insertion mechanism 61 for rotating the dummy shafts 47a, 47b and pushing them into the mounting holes of the respective mounting components. This rotational insertion mechanism 61 includes a dummy shaft insertion cylinder 62 that suppresses the dummy shafts 47a and 47b in the axial direction, and a dummy shaft insertion cylinder 62 that suppresses the dummy shafts 47a and 47b in the axial direction.
7a.

Dummy shaft rotation drive motor 6 that rotates 47b
3 is provided. One dummy shaft 47 is attached to the rotating shaft 63a of this dummy shaft rotation drive motor 63.
A driving gear 64 that can mesh with gear 57a (or 57b) of gear 57a (or 47b) is fixed. Then, as shown in FIG. 5, the dummy shafts 47a and 47b are inserted into the dummy shafts 47a and 47b by this rotary insertion machine 61 at the terminal position of the conveyance path 21, as shown in FIG.
These dummy shafts 47a are placed in the mounting holes of the mounting parts of the rocker shafts 4.4, which are transferred onto the respective bullets 40 of the conveyance path 21 while simultaneously rotating the dummy shafts 47a.

47b is pushed in to align each installed component.

In addition, as shown in FIG. 8, dummy shafts 47a and 47b are fitted with the various mounting parts of the rocker shaft 4.4.
is conveyed by a dummy shaft circulation device 49 to the insertion position of the regular shaft. At the insertion position of this regular shaft, as shown in FIG. 9, a dummy shaft 47a47b is attached (rocker shaft 4.
4) A compression mechanism 6 that compresses the space between each installed part to a regular size.
5 is provided. This compression mechanism 65 is provided with a stopper 66 and a compression jig 67, which also serve as a guide for the regular shaft. As shown in FIG. 10, a pair of guide holes 68a and 68b for the regular shaft are formed in this spring I/flange 66, and as shown in FIG. An appropriate chamfered portion 69 is formed. Furthermore, the compression jig 67
A press plate 70 and a drive cylinder 71 are provided. And a dummy shaft 47a.

The tip of 47b is the guide hole 68a of this stopper 66,
47a, 4 (dummy shirt pushed into 68b)
The pressing plate 70 of the compression jig 67 is pressed against each mounted part (of the rocker shafts 4, 4) mounted on the dummy shaft 47a47b from the base end side of the compression jig 7b, and in this state, the dummy shirt I. 47 a, 4
7 bl;: Installed (rocker shaft 4, 4)
The space between each installed part is compressed to regular dimensions.

In addition, the rocker shaft 4 is located at the insertion position of the regular shaft.
A rocker shaft conveyance path 7 connected to a supply device 72 of
In addition, a positioning device 74 for the rocker shafts 4, 4 and the rocker shaft pushing device 46 shown in Fig. m12 are also provided. In this case, the rocker shaft conveyance path 73 is arranged approximately parallel to the four conveyance belts 51a and 51b of the dummy shaft circulation device, and the rocker shaft supply device 72 is disposed at the base end of the rocker shaft conveyance path 73. There is. The rocker shaft positioning device 74 also includes a bearing member 75 disposed below each rocker shaft 4 and rotatably supporting the rocker shaft 4, as shown in FIG.
and a substantially cylindrical alignment jig 76 which is disposed above the rocker shaft 4 and rotates the rocker shaft 4. In this case, rocker shaft 4
A plurality of notches 77 extending in the circumferential direction and insertion holes 78 for fixing bolts 10 are provided on the outer peripheral surface of the .
... are formed locally. The outer opening end 80a of an oil outlet 80 connected to seven oil flow holes formed inside each rocker shaft 4 is formed in these notches 77.

Moreover, these notches 77... are formed substantially parallel to the fixing bolt insertion holes 78... as shown in FIG. When the fixing bolt lO... is inserted into each fixing bolt insertion hole 78..., these notches 7
7... is arranged laterally outward,
During operation of the engine body, a portion of the lubricating oil in the seven oil distribution holes formed inside each rocker shaft 4 is led out to the outside of each rocker shaft 4 through the oil outlet 80, and The outer peripheral surface of No. 4 is lubricated.

Furthermore, the alignment jig 76 is provided with a pair of substantially cylindrical angle-setting loaders 81, 81, and each rocker shaft 4.
At positions corresponding to the notches 77 on the outer circumferential surface of 4, substantially circular flange-shaped positioning protrusions 82 that can be inserted into these notches 77 are provided. In addition, these angular loaders 81, 81 are supported by support rods 83, 83.
Fixed. Furthermore, these support rods 83,
One end of the rod 83 is rotatably attached to a suitable support member 84, and gears 85, 85 are fixed to the other ends of these support rods 83, 83, respectively. Further, a loader drive motor 86 is connected to one support rod 83, and an interlocking gear 88 connected to an a-da actuating cylinder 87 is connected between each gear 85, 85 of the support rods 83, 83 on both sides. They are installed in an interlocking state. Then, when the pair of rocker shafts 4, 4 are conveyed from the rocker shaft supply device 72 to the regular shaft insertion position via the rocker shaft conveyance path 73, they are installed on the bearing member 75 at this regular shaft insertion position, In this state, the rocker shaft positioning device 74 is driven. Furthermore, when the rocker shaft positioning device 74 is driven, the angle-setting loaders 81, 81 are rotated at fixed positions with respect to the rocker shafts 4, 4.
1.81 causes the rocker shaft 4.4 on the bearing member 75 to rotate.

In this case, the positioning convex portion 8 of the angular loader 81.81
2... are each rocker shaft 4 as shown in FIG.
, 4, the rotation of the rocker shafts 4, 4 on the bearing member 75 is stopped, and in this state, the rocker shafts 4, 4 are positioned in the circumferential direction. It looks like this.

Further, in this positioning state, the shaft positioning cylinder 89 is driven, and, for example, a pair of positioning rods 90, 90 provided on this shaft positioning cylinder 89 are inserted into the fixing bolt insertion holes 78, 78 of each rocker shaft 4, 4.
Pushed in, the rocker shaft 4.4 is locked in this position.

Moreover, when the rocker shafts 4, 4 are positioned in the circumferential direction, the rocker shaft insertion device 46 is subsequently driven. This rocker shaft insertion device 46 is provided with a suppression cylinder (insertion mechanism) that presses the rocker shaft 4.4 in the axial direction with an appropriate pressing force. Then, the rocker shaft 4.4 is pressed by this pressing cylinder from the side opposite to the insertion direction of the dummy shafts 47a and 47b, and the dummy shaft 47a is pressed.

Press fit the rocker shafts 4, 4 into the mounting holes of the respective mounting parts (of the rocker shaft 4.4) mounted on the dummy shafts 47a, 47b, and remove the dummy shafts 47a, 47b from the mounting holes of the respective mounting parts. A rocker shaft 4 unit A is formed by pushing the rocker shaft 4°4 into a predetermined insertion position.

Furthermore, a unit transfer mechanism 92 is provided at the insertion position of the regular shaft for transferring the assembled rocker shaft 4 unit A to a transfer path 91 of the cylinder head 2 in the subsequent process formed by, for example, a belt conveyor. The unit transfer mechanism 92 transfers the rocker shaft 4 unit A to the cylinder head 2 on the conveyance path 91. Also, on this conveyance path 91, each cam cap 8 of the rocker shaft 4 units A...
An automatic bolt-fastening device 93 is provided which automatically inserts the fixing bolts 10 into the bolt insertion holes and bolts the rocker shaft 4 unit A to the cylinder head 2 using these fixing bolts 10. The rocker shaft 4 unit A and the cylinder head 2 are automatically assembled.

Therefore, in the above configuration, the coil spring 9
supply device 22, and each supply device 23a of a pair of rocker arms 5.5 (on the intake pulp 6 side and the exhaust valve 7 side).
.
1, first push the dummy shafts 47a, 47b, which have a smaller diameter than the rocker shafts 4, 4, into the mounting holes of the mounting parts of each rocker shaft 4.4, align each mounting part, and then insert each mounting part. Press fit the regular rocker shafts 4, 4 into the mounting holes of the dummy shaft 47a.
, 47b from the mounting hole of each mounting component, and insert each rocker shaft 4 into a predetermined insertion position in the mounting hole of each mounting component.
, 4 are inserted, a plurality of rocker arms 5 are inserted on the rocker shafts 4, 4 of the OHC type valve mechanism.
..., cam cap 8... coil spring 9.
It is possible to automate the assembly work of the rocker shaft 4 unit A in which each installed part such as... etc. is attached.

Therefore, the work efficiency of the assembly work of the Rocker Shaft 4 Nit A can be improved compared to the case where the assembly work is done manually by workers as in the past, and the work efficiency of the assembly work of the entire engine body can be improved. can be achieved.

Note that this invention is not limited to the above embodiments. For example, in the above embodiment, an OHC valve mechanism was described for a three-cylinder engine body in which one intake valve 6 and one exhaust valve 7 are installed in each cylinder, but other numbers of cylinders and valves may be used. OH of the engine body
It may also be applied to a C-type valve mechanism. Furthermore, it goes without saying that various other modifications can be made without departing from the gist of the invention.

[Effects of the Invention] According to the present invention, a coil spring supply device that separately supplies coil springs one by one, a rocker arm supply device, and a cam cap supply device are respectively disposed in sequence on a conveyance path, and At the same time, a dummy shaft with a diameter smaller than the rocker shaft is installed in the mounting hole of each rocker shaft mounting part at the end of the transport path. After inserting the dummy shaft and aligning each mounting part, press-fit each rocker shirt into the mounting hole of each mounting part, pull out the dummy shaft from the mounting hole of each mounting part, and insert it into the specified position in the mounting hole of each mounting part. Since we have provided a rocker shaft insertion mechanism for inserting each rocker shaft into the insertion position, we can assemble the rocker shaft unit to attach multiple rocker arms, cam caps, coil springs, and other installed parts onto the rocker shaft of the OHC valve mechanism. can be automated, and the efficiency of the assembly work can be improved, thereby improving the efficiency of the assembly work of the entire engine body.

[Brief explanation of drawings]

Figures 1 to 15 show an embodiment of the present invention, with Figure 1 being a perspective view showing a schematic configuration of the entire rocker shaft unit assembly device, and Figure 2 showing a schematic configuration of a coil spring supply device. FIG. 3 is a vertical sectional view of the main parts of the spring separator, FIG. 4 is a perspective view showing the distributor of the conveyance path, FIG. 5 is a perspective view showing the schematic configuration of the dummy shaft pushing device, and FIG. The figure is a perspective view showing the schematic configuration of the dummy shaft circulation device, Figure 7 is a front view showing the support structure of the holding block, and Figure 8 shows the state in which the dummy shaft is pushed into the mounting holes of each mounting part of the rocker shaft. Front view showing,
Fig. 9 is a front view showing the compression mechanism that compresses the space between the installed parts to regular dimensions, Fig. 10 is a front view showing the stopper, and Fig. 1
Figure 1 is a vertical sectional view showing the state of insertion of the regular shaft;
The figures are a perspective view showing the schematic structure of the rocker shaft positioning device and the rocker shaft insertion device, Fig. 13 is a perspective view showing the alignment jig, Fig. 14 is a vertical cross-sectional view showing the state in which the rocker shaft is installed, and Fig. 15 16 is a vertical cross-sectional view showing the positioning state of the rocker shaft, FIG. 16 is a vertical cross-sectional view showing the schematic structure of the OHC type valve mechanism, and FIG. 17 is a perspective view showing the schematic structure of the rocker shaft unit. 2... Cylinder head, 4... Rocker shaft,
5... Rocker arm, 8... Cam cap, 9...
... Coil spring, A ... Rocker shaft unit, 21 ... Conveyance path, 22 ... Coil spring supply device, 23a, 23b ... Rocker arm ° supply device, 24 ... Cam cap supply device, 47a, 4
7b...Dummy shaft.

Claims (1)

[Claims] A pair of rocker shafts is inserted into each of the mounting holes of a plurality of cam caps attached to the cylinder head, and a rocker arm and a coil spring arranged between the adjacent pair of cam caps are respectively mounted on each of the rocker shafts. In the rocker shaft unit assembly device for forming a rocker shaft unit by using a coil spring supply device, a coil spring supply device for separately supplying the coil springs one by one, a supply device for the rocker arm, and a supply device for the cam cap are sequentially arranged on a conveying path. a conveyance mechanism is provided on the conveyance path for sequentially conveying the mounted parts of the rocker shaft in a predetermined order, and the mounted parts of the rocker shaft are mounted on the terminal end of the conveyance path; After inserting a dummy shaft with a smaller diameter than the rocker shaft into the hole and aligning each of the installed parts,
Each of the rocker shafts is press-fitted into the mounting hole of each of the mounting parts, the dummy shaft is extracted from the mounting hole of each of the mounting parts, and each of the rocker shafts is inserted into a predetermined insertion position in the mounting hole of each of the mounting parts. A rocker shaft unit assembly device characterized by being provided with a rocker shaft insertion mechanism section.