JPH0929563A - Bearing metal assembly device - Google Patents

Abstract

(57) [PROBLEMS] To securely engage a convex portion Ma formed at one end of a bearing metal M with a concave portion Sa formed at one end of a bearing surface S of a work W, and to make the bearing metal contact the bearing surface. Make sure that you can assemble without making mistakes. An assembly head 2 attached to a movable mechanism 1.
In addition, the gripping tool 3 for gripping the bearing metal M in a posture such that the other end thereof floats from the bearing surface is biased in a direction such that the convex portion Ma at one end of the bearing metal M is pressed against the bearing surface M. 8
When the assembling head 2 is moved in the axial direction of the bearing metal M, the convex portion Ma falls into the concave portion Sa when it coincides with the concave portion Sa. In addition, the assembly head 2
Is provided with a pressing means 4 for contacting the other end of the bearing metal M,
After engaging the convex portion Ma with the concave portion Sa, the pressing means 4 is operated to push the other end of the bearing metal M into the bearing surface S.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing metal in which a half-divided bearing metal is assembled to a bearing surface of a workpiece which is recessed in a semicircular shape, for example, a bearing surface of a large end portion of a connecting rod for an engine piston. Assembly device.

[0002]

2. Description of the Related Art Conventionally, in this type of assembling apparatus, as shown in Japanese Utility Model Publication No. 5-25784, an assembling head having a gripping tool for a bearing metal is provided and a space between the assembling head and the work is provided. After the positioning is performed, the assembling head is moved forward to the work side, and the bearing metal is linearly pushed into the bearing surface of the work to be assembled.

[0003]

By the way, in order to prevent axial displacement of the bearing metal with respect to the workpiece, a recess is formed at one end of the bearing surface in the circumferential direction and at the one end of the bearing metal at the outer circumferential surface in the circumferential direction. There is one that forms a convex portion and engages the convex portion with the concave portion to position the bearing metal in the axial direction. In this case, since the concave portion and the convex portion have processing tolerances,
Even when the positioning between the assembly head and the work is performed as in the conventional example described above, when the assembly head advances toward the work side, the projection does not engage with the concave portion, and an assembly error may occur. In view of the above points, an object of the present invention is to provide a highly reliable bearing metal assembling apparatus capable of reliably engaging a convex portion with a concave portion.

[0004]

In order to achieve the above object,
According to the present invention, a bearing metal having a semi-divided shape is formed on a bearing surface that is recessed in a semicircular shape of a work, and a convex portion is formed on a circumferential end of the outer peripheral surface of the bearing metal in a concave portion formed on one end of the bearing surface in the circumferential direction. In a bearing metal assembling apparatus that is assembled in a state where the parts are engaged and positioned in the axial direction, an assembling head whose movement is controlled by a movable mechanism is provided, and the bearing metal has the other end in the circumferential direction. A gripping tool that grips in a posture such that it floats from the bearing surface is urged and supported in a direction such that the convex portion of the bearing metal is pressed against the bearing surface, and the assembly head is
A pressing means for pressing the other end of the bearing metal in the circumferential direction into the bearing surface is provided.

According to the above construction, when the mounting head is advanced to the work side, the convex portion of one end of the bearing metal in the circumferential direction abuts on one end of the bearing surface in the circumferential direction, and in this state the bearing is mounted on the mounting head. When the metal moves in the axial direction, when the convex portion reaches the axial position corresponding to the concave portion formed at one end portion in the circumferential direction of the bearing surface, the convex portion falls into the concave portion due to the biasing force acting on the gripping tool. Therefore, even if the assembling head is not accurately positioned with respect to the work, and even if the axial positions of the concave portion and the convex portion are deviated by the processing tolerance, the convex portion can be reliably engaged with the concave portion. After that, the gripping of the bearing metal by the gripping tool is released and the pressing means is operated to push the other end of the bearing metal in the circumferential direction into the bearing surface.

When the convex portion engages with the concave portion, the gripping tool is axially restrained with respect to the work through the bearing metal, and unless the assembling head is suddenly stopped at that point, it is impossible for the gripping tool and the bearing metal. Takes. However, in order to suddenly stop the assembling head in this way, it is necessary to considerably slow down the moving speed of the assembling head, which lowers the work efficiency. In this case, if the gripper is supported so that it can move relative to the mounting head in the axial direction of the bearing metal, the gripper can move relative to the mounting head in the axial direction after the recess is engaged with the protrusion. Therefore, even if the gripping tool is not stopped suddenly, the gripping tool and the bearing metal will not be overloaded. Therefore, it is possible to improve the work efficiency by increasing the moving speed of the assembling head.

If the convex portion is not engaged with the concave portion, the other end of the bearing metal in the circumferential direction cannot be pushed into the bearing surface, and after confirming that the convex portion is engaged with the concave portion, the pressing means is operated. It will need to be activated. If the gripping tool is supported so as to be movable relative to the mounting head in the axial direction of the bearing metal as described above, the relative movement of the gripping tool with respect to the mounting head makes it possible to confirm the engagement of the convex portion with the concave portion. It is desirable to provide a detecting means for detecting the movement and to operate the pushing means by the signal of the detecting means.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION As shown in FIG. 7, a bearing metal having a half-divided shape on a bearing surface S for a crankshaft which is recessed in a semicircular shape and which is formed on a large end portion of a work W made of a connecting rod for an engine piston. An embodiment in which the present invention is applied to an assembling device for assembling M will be described. A recess Sa is formed at one corner in the axial direction at one end in the circumferential direction of the bearing surface S, and a bearing metal M is formed at one corner in the axial direction at one end in the circumferential direction on the outer circumferential surface of the bearing metal M. Is provided with a convex portion Ma formed by half-cutting out the corner portion of the concave portion Sa to the concave portion Sa.
The bearing metal M is assembled to the bearing surface S in the state of being engaged and positioned in the axial direction.

The assembling apparatus includes a jig (not shown) for supporting the work W at a fixed position with the bearing surface S facing upward, and the tip of the arm 1 of the robot, which is a movable mechanism, as shown in FIGS. 1 and 2. And the assembling head 2 attached to.

The assembling head 2 is provided with a holding tool 3 for the bearing metal M and a pressing means 4 for the bearing metal M.
The gripper 3 grips the bearing metal M from both sides in the axial direction 1
A pair of clamp arms 3a, 3a and both arms 3a, 3a
and an actuator 3b for opening and closing a,
The two clamp arms 3a, 3a have the bearing metal M and the convex portion M.
It is formed so that the other end in the circumferential direction, which is the formation end of a, is held in an inclined posture with the other end in the circumferential direction positioned above.

The gripper 3 is supported by the assembling head 2 in a direction in which the convex portion Ma of the bearing metal M is pressed against the bearing surface S, that is, by being biased to the right in FIG. It is supported so as to be movable relative to the assembly head 2 in the axial direction of the bearing metal M. To explain this in detail, the head main body 2a of the assembly head 2 is formed in a box shape that opens downward, and a horizontal first support shaft 5 orthogonal to the axial direction of the bearing metal M is formed at the upper end of the main body 2a. The support 6 for gripping tool is pivotally supported on the support shaft 3c so as to be swingable, and the second support shaft 7 parallel to the axial direction of the bearing metal M is attached to the lower end of the support 6. , The gripper 3 on the support shaft 7 and the stay 3c at the upper end of the actuator 3b.
It was pivotally supported at. And the head body 2
The first urging means 8 composed of a spring plunger for urging the grasping tool 3 to the right in FIG. 1 with the second supporting shaft 7 as a fulcrum is attached to the A second urging means 9 composed of a spring plunger for oscillating and urging the bearing metal M in one axial direction (rightward in FIG. 2) with the shaft 5 as a fulcrum was attached. In addition, the grasping tool 3 includes the urging means 8 and 9 respectively.
Of the head main body 2a facing each other in the urging direction of the head main body 2a by the actuator 3b, and the head 2 is always attached.
Is held in place against.

Further, the upper end of the assembling head 2 is provided with a detecting means 10 comprising a limit switch which cooperates with a dog piece 10a attached to the support body 6, and the gripping tool 3 causes the second biasing means 9 to exert a biasing force. When the bearing metal M swings in the other axial direction and moves relative to the assembly head 2, the detection means 10 can detect this.

The pressing means 4 is vertically movably inserted and supported by a pair of guide sleeves 11, 11 mounted on the outer surface of the lower portion of the head body 2a via a bracket 11a via a pair of guide bars 4a, 4a. And a cylinder 4c on a bracket 11a for moving the lifting plate 4b up and down. Along with setting
The guide bar 4a on one end side in the circumferential direction of the bearing metal M is vertically movable on the elevating plate 4b and is urged downward by a spring 4e so as to be inserted and supported. The second pressing piece 4f opposed to one end was fixed.

When assembling the bearing metal M, the bearing metal M is interposed between the pair of clamp arms 3a, 3a of the gripper 3.
With the robot gripping, the assembling head 2 is moved to a position directly above the work W and lowered by the operation of the robot arm 1. At this time, the position of the assembling head 2 is intentionally shifted so that the convex portion Ma of the bearing metal M is positioned on the other side (left side in FIG. 2) in the axial direction with respect to the concave portion Sa of the bearing surface S. According to this,
When the assembling head 2 is lowered, the convex portion Ma of the bearing metal M is
4A, as shown in FIG. 4A, abuts on a portion of the bearing surface S which is axially displaced from the concave portion Sa at one end in the circumferential direction, and the contact reaction force causes the gripping tool 3 to move to the position shown in FIG. As shown in FIG. 5, the first urging unit 8 swings to the left against the urging force of the first urging unit 8. At this time, the other end of the bearing metal M in the circumferential direction floats above the bearing surface S.

Next, the assembly head 2 is moved to one side in the axial direction of the bearing metal M by the operation of the robot arm 1. According to this, the convex portion Ma of the bearing metal M causes the bearing surface S to move.
4A slides in the circumferential direction in the axial direction, and when the convex portion Ma reaches the axial position matching the concave portion Sa as shown in FIG. 4B, it acts on the bearing metal M via the gripping tool 3. By the urging of the first urging means 8, the convex portion Ma falls into the concave portion Sa and engages with the concave portion Sa as shown in FIG. 3 (B).

The moving distance in the axial direction of the assembling head 2 is determined by the convex portion M.
The length is set to be long in consideration of the machining tolerance between the a and the concave portion Sa, so that the convex portion Ma engages with the concave portion Sa during the movement of the assembly head 2. At this time, the gripping tool 3 is axially restrained with respect to the work W via the bearing metal M, and the gripping tool 3 is urged by the second urging means 9 with the movement of the assembly head 2 thereafter. On the contrary, it moves relative to the assembly head 2 as shown in FIG.

When this relative movement is detected by the detecting means 10, the pair of clamp arms 3a of the gripping tool 3,
While opening 3a, the cylinder 4c of the pressing means 4 is operated to lower the elevating plate 4b. According to this, first, the second pressing piece 4f comes into contact with the work end surface on the one end side in the circumferential direction of the bearing surface S, and thereafter the elevating plate 4b descends while compressing the spring 4e, so that the first pressing piece 4d becomes the bearing. The metal M is brought into contact with the other end in the circumferential direction, and the other end is pushed into the bearing surface S as shown in FIG. At this time, one end portion of the bearing metal M in the circumferential direction tries to float from the bearing surface S, but this lifting is caused by the second
The bearing metal M is blocked by the pressing piece 4f, and the bearing metal M is accurately assembled to the bearing surface S.

In the above embodiment, the gripping tool 3 is allowed to move relative to the assembly head 2 in the axial direction of the bearing metal M by swinging about the first support shaft 5, but as shown in FIG. A support body 6 which pivotally supports the gripping tool 3 via a second support shaft 7 is supported on the head main body 2a via a pair of parallel links 5 ', 5', or as shown in FIG. Is slidably supported by a guide bar 5 ″ attached to the head body 2a, and the gripping tool 3
Can be relatively movable in the axial direction of the bearing metal M.

Further, the present invention is similarly applied to not only the assembling of the bearing metal to the bearing surface of the large end portion of the connecting rod described above but also the assembling of the bearing metal to the bearing surface of the connecting rod cap attached to the large end portion. Applicable.

[0020]

As is apparent from the above description, according to the present invention, the convex portion of the bearing metal can be securely engaged with the concave portion of the bearing surface of the work, and the mistake of assembling the bearing metal can be prevented. You can improve the property.

[Brief description of drawings]

FIG. 1 is a cutaway front view of a first embodiment of an assembly head used in an apparatus of the present invention.

FIG. 2 is a side view cut along the line II-II of FIG. 1;

FIG. 3 is a cutaway front view showing a procedure for assembling (A), (B) and (C) bearing metal.

FIG. 4 is a cutaway side view showing an assembly procedure of (A), (B) and (C) bearing metals.

FIG. 5 is a cutaway side view of the second embodiment of the assembly head.

FIG. 6 is a cutaway side view of a third embodiment of an assembling head.

FIG. 7 is a perspective view of the work and the bearing metal in a separated state.

[Explanation of symbols]

W work S bearing surface Sa concave portion M bearing metal Ma convex portion 1 robot arm (movable mechanism) 2 assembly head 3 gripping tool 4 pressing means

Claims (3)

[Claims] 1. A bearing metal in a half shape is formed on a bearing surface of a workpiece which is recessed in a semi-circular shape, and is formed at a circumferential end of an outer peripheral surface of the bearing metal in a recess formed at one circumferential end of the bearing surface. In a bearing metal assembling device that is assembled in a state where the protrusions are engaged and positioned in the axial direction, an assembly head is provided whose movement is controlled by a movable mechanism, and the bearing metal is attached to the assembly head at the other end in the circumferential direction. Hold the gripper in such a position that it floats above the bearing surface in a direction in which the convex portion of the bearing metal is pressed into contact with the bearing surface, and at the same time, mount the peripheral part of the bearing metal on the assembly head. A bearing metal assembling apparatus, characterized in that a pressing means for pressing the other end in the direction of the bearing into the bearing surface is provided. 2. The bearing metal assembling apparatus according to claim 1, wherein the gripping tool is supported so as to be movable relative to the assembling head in the axial direction of the bearing metal. 3. The bearing metal assembling apparatus according to claim 2, further comprising detection means for detecting the relative movement of the gripping tool, and the pushing means being operated by a signal from the detection means.