JP3260571B2 - Valve lifter insertion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the assembly of an automobile engine having a direct acting overhead camshaft structure in which an intake or exhaust valve is directly driven by a camshaft.
The present invention relates to a valve lifter insertion device for automatically inserting a valve lifter in contact with the camshaft into a lifter insertion hole used in a process .

[0002]

2. Description of the Related Art In a direct acting engine structure in which an intake or exhaust valve of an automobile engine is directly driven by a camshaft, a valve lifter is inserted into a lifter insertion hole provided in an engine block, and a drive end of the valve by the camshaft is inserted. Form. Since the valve lifter and the lifter insertion hole are formed with a narrow clearance relationship accuracy, when the valve lifter is inserted by an automatic insertion device such as a robot, if there is a deviation or inclination of the axis, so-called galling occurs and the insertion load is increased. As a result, the valve lifter and the lifter insertion hole are damaged. Therefore, in the prior art, the valve lifter was gripped by a hand having a copying function, and the deviation and inclination of the axis were corrected to insert the valve lifter into the lifter insertion hole.

[0003]

However, the hand having the following function has a problem that the load on the automatic insertion device (robot) becomes large and the cost is high because the structure is complicated and the hand weight is large. In addition, there has been a problem that component parts must be replaced regularly. Therefore, it is an object of the present invention to provide a valve lifter which can automatically insert a valve lifter into a lifter insertion hole accurately without using a hand having the above-described function.
It is to provide a device .

[0004]

In order to achieve the above object, the present invention provides a cylindrical valve lifter held by a hand portion of an automatic insertion device, which is formed with a precision that is closely related to a diameter of the valve lifter and a narrow clearance. In the valve lifter insertion device inserted into a lifter insertion hole formed with a vertical wall of a bearing supporting a camshaft on a side portion,
Is a suction device that sucks the valve lifter by vacuum suction.
Step and the valve lifter along the suction surface by the vacuum suction described above.
Slidable holding means for slidably holding the
And the valve lifter is sucked by the sliding holding means.
With the valve lifter moving
Press the valve lifter against the vertical wall
By sliding along the suction surface of the valve.
Positioning means for aligning the center of the lid with the lifter insertion hole
And the valve lifter with the vertical wall as a guide.
And inserting means for inserting the tip into the cover insertion hole is the insertion device of the valve lifter, characterized by comprising; and a pushing means for pushing the valve lifter which has been adsorbed by the exhaust from the hand portion to the lifter insertion hole .

[0005]

According to the present invention, a camshaft formed on a side portion of a lifter insertion hole is supported for automatically inserting a valve lifter into a lifter insertion hole formed with a precision that is closely related to the diameter of the valve lifter. Suction means for using the vertical wall of the bearing as an insertion guide and for sucking the hand part of the automatic insertion device by vacuum suction of the valve lifter.
And the valve lifter is moved along the suction surface by the vacuum suction.
And a slidable holding means for holding the slidably . The suction of the hand part is performed by the suction means and the slide holding means.
When the valve lifter is slidably adsorbed and held on the mounting surface, and the hand unit is moved, the valve lifter is pressed against the vertical wall formed at the entrance of the lifter insertion hole.
Because it is slidable on the mounting surface, the position of the valve lifter
The valve lifter and the lifter insertion port
The cores automatically match . After this, the above vertical wall is used as a guide
Insert the valve lifter into the lifter insertion port
Switching the hand portion in the extrusion by the exhaust valve lifter is pushed out, it is inserted into the re-cover the insertion hole. As described above, according to the present invention, the hand portion that can switch between air suction and air extrusion and the vertical wall formed at the entrance of the lifter insertion hole are used as guides, so that the valve lifter can be securely inserted without using any special device. Can be implemented.

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings to provide an understanding of the present invention. The following embodiments are examples embodying the present invention and do not limit the technical scope of the present invention. Here, FIG. 1 is a schematic view showing a procedure of a method of inserting a valve lifter according to an embodiment of the present invention, FIG. 2 is a perspective view of an engine using the valve lifter according to the embodiment, and FIG. FIG. 4 is a plan view of an engine block according to the embodiment, and FIG. 5 is a cross-sectional view of a lifter insertion hole according to the embodiment. First, an engine structure to which the valve lifter insertion method according to the present embodiment is applied will be described. Figure 2 shows a direct acting double overhead camshaft (DOHC)
FIG. 2 is a perspective view showing a perspective view of the inside of the engine in which the mechanism is adopted, and the engine is configured as a four-valve engine. Two intake valves 12 and two exhaust valves 13 are provided for one cylinder, and each of the valves 12 and 13 is driven by an intake camshaft 14 and an exhaust camshaft 15, respectively. The driving of the valves 12 and 13 by the camshafts 14 and 15 is performed by the cam pressing the valve lifter 1 provided at the upper end of the valves 12 and 13.

As shown in FIG. 3, each of the valves 12 and 13 is mounted in an engine block 11, and a valve lifter 1 inserted through a lifter insertion hole 2 is mounted at an upper end. Since the engine according to the present embodiment is of a direct-acting type, the camshafts 14 and 15 come into contact with the valve lifter 2 to drive the valves 12 and 13. The camshafts 14 and 15 are supported by a bearing 10 disposed above the engine block 11 as shown in FIG. Since the bearing 10 is disposed between the lifter insertion holes 2, 2,..., The bearing 10 is hollowed out in a circular shape along the shape of the lifter insertion hole 2 between the adjacent lifter insertion holes as shown in FIG. A vertical wall 3 is formed in the portion. FIG. 5 shows this state of one lifter insertion hole 2 in a direction orthogonal to the sectional direction of FIG. As shown in FIG. 5, a vertical wall 3 of the bearing 10 is formed on one side of the upper end of the lifter insertion hole 2. Lifter insertion hole 2 and vertical wall 3
Is about 0.25 mm, and the upper end of the lifter insertion hole is chamfered as shown. A method for automatically inserting the valve lifter 1 into the lifter insertion hole 2 formed as described above will be described below with reference to the drawings for each procedure shown in FIG. Since the diameter of the valve lifter 1 and the inner diameter of the lifter insertion hole 2 are formed with a narrow clearance relationship, in order for the valve lifter 1 to be automatically inserted into the lifter insertion hole 2 by an automatic insertion device, the axes must be aligned. An insert operation must be performed. In the present embodiment, the insertion with the axial center coincident is performed by using the vertical wall 3 formed by the bearing 10 formed on the insertion end side of the lifter insertion hole 2 and the hand part of the automatic insertion device. This is achieved without any special means. As shown schematically in FIG.
The hand unit 4 of the automatic insertion device (robot) has suction means for sucking the valve lifter 1 by air suction and pushing means for pushing out the valve lifter 1 by air exhaustion.
The means can be switched. FIG.
1A, the valve lifter 1 is slidably sucked and held (sliding holding means) on the suction surface shown in the drawing by making the hand portion 4 air suction, and the hand portion 4 is moved to the position of the lifter insertion hole 2. As shown in FIG.
In addition to the force, means are provided to block the sliding on the suction surface.
Not. A lash adjuster or the like is formed in the valve lifter 1 but is not shown.

Next, as shown in FIG. 1B, the valve lifter 1 moved to the position of the lifter insertion hole 2 is pressed against the vertical wall 3. By this operation, the valve lifter 1 at the moving position of the hand unit 4 slides on the suction surface, and the valve lifter 1
When the valve lifter 1 is pressed against the vertical wall 3, the valve lifter 1 that is air-absorbed by the hand unit 4 even if the axis of the lifter 1 is not aligned with the axis of the lifter insertion hole 2. Is corrected by the deviation of the position suction position. Positioning means realizes such movement.
You . Next, from the state where the valve lifter 1 is pressed against the vertical wall 3, the hand portion 4 is slightly advanced toward the lifter insertion hole 2 side,
Using the vertical wall 3 as a guide, insert the valve lifter 1 into the lifter insertion hole 2
Insert a little into. At this time, although the axes of the valve lifter 1 and the lifter insertion hole 2 do not coincide with each other due to the step between the vertical wall 3 and the lifter insertion hole 2, the lower end of the valve lifter 1 is chamfered and the upper end of the lifter insertion hole 2 is formed. Since the portion is chamfered, the position of the air suction of the hand portion 4 shifts as the valve lifter 1 is inserted, and coincides with the lifter insertion hole 2. The insertion means realizes such movement.
You . Finally, as shown in FIG. 1C, the hand unit 4 is switched to the exhaust, and the valve lifter 1 is pushed out. The valve lifter 1 is inserted into a predetermined position in the lifter insertion hole 2 by the pushing operation by the exhaust. As the valve lifter 1 is inserted into the lifter insertion hole 2 by being pushed out by exhaustion, the valve lifter 1 follows the direction of the lifter insertion hole 2 and is inserted with its inclination corrected. Extrusion to realize such movement
Means .

[0009]

As described above, according to the present invention, in order to automatically insert a valve lifter into a lifter insertion hole formed with a precision that is closely related to a diameter of the valve lifter and a narrow clearance, the valve lifter is slidable in a hand portion. adsorbed, and with utilizing the vertical wall of <br/> bearing supporting the camshaft is formed in the side of the lifter insertion hole as the insertion guide, the hand portion of the automatic insertion device and the air suction and air-extruded The configuration can be switched. When the valve lifter is sucked and held by the hand part by air suction and the valve part is pressed against the vertical wall formed at the entrance of the lifter insertion hole by the movement of the hand part, the air suction and the slidability are caused.
Since the holding position of the valve lifter can be shifted, the direction of the valve lifter and the lifter insertion hole coincide with each other using the vertical wall as a guide. Therefore, the tip of the valve lifter is inserted into the lifter insertion hole. Thereafter, when the hand is switched to the extrusion by the exhaust, the valve lifter is inserted into the lifter insertion hole. As described above, the hand that can switch between air suction and air extrusion and the vertical wall formed at the entrance of the lifter insertion hole are used as guides, so the valve lifter can be used without using a special device such as a hand that has a copying function. Insertion can be performed reliably.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a procedure of a method of inserting a valve lifter according to an embodiment.

FIG. 2 is a perspective view showing a configuration of an engine to which the method of the embodiment is applied.

FIG. 3 is a sectional view of a valve position of an engine to which the embodiment method is applied.

FIG. 4 is a plan view of an engine block of an engine to which the embodiment method is applied.

FIG. 5 is a sectional view of a lifter insertion hole according to the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Valve lifter 2 ... Lifter insertion hole 3 ... Vertical wall 4 ... Hand part 10 ... Bearing 14, 15 ... Camshaft

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-154723 (JP, A) JP-A-58-77484 (JP, A) JP-A-61-121499 (JP, A) JP-A-8-78 116199 (JP, A) JP-A-4-123496 (JP, A) JP-A-5-183298 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B23P 19/00-21 / 00 F01L 1/14 F02B 33/30

Claims (1)

(57) [Claims] A cylindrical valve lifter held by a hand part of an automatic insertion device is formed with a precision that is closely related to the diameter of the valve lifter and a vertical wall of a bearing for supporting a camshaft is formed on a side portion thereof. In the valve lifter insertion device inserted into the lifter insertion hole, the hand unit sucks the valve lifter by vacuum suction.
And the valve lifter is attached by the vacuum suction.
Sliding holding means for slidably holding along the suction surface
Is constituted by Bei, shape the valve lifter was adsorbed by the slide holding means
Move the hand part in the state and lift the valve lifter
Press the valve lifter against the vertical wall and
The valve lifter is slid along the mounting surface
Positioning means for positioning the valve lifter on the vertical wall, and the valve lifter using the vertical wall as a guide for the valve lifter.
And inserting means for inserting the tip into the insertion hole, the insertion device of the valve lifter, characterized by comprising; and a pushing means for pushing the valve lifter which has been adsorbed by the exhaust from the hand portion to the lifter insertion hole.