JP7295502B2 - Mobile assembly equipment - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile assembly apparatus, and more particularly to a mobile assembly apparatus that moves a driving device to an assembly target and fastens a fastening component to the assembly target.

Conventionally, there has been known a mobile drive device (nutrunner) having a socket capable of holding a fastening part having a thread groove such as a bolt or nut, and a drive means for rotationally driving the socket. Such a mobile drive device is assembled at each assembly factory for car bodies, vehicles, engines, etc., where a fastening part is fitted into the tip of a socket, and an operator himself/herself moves and conveys the driving means to the body to be assembled to remove the fastening part. After positioning in the threaded hole in which the female thread is formed (aligning the axis of the fastening part with the axis of the threaded hole), the fastening part is rotationally driven to be fastened and fixed to the assembled body.

The two-shaft simultaneous tightening device of Patent Document 1 includes a drive shaft that is rotationally driven by a drive source that is an impact body, and first and second idle gears that are rotationally driven by the drive shaft through first and second idle gears, respectively. a tightening unit, the first tightening unit having a detachable box-type adapter for holding and tightening the head circumference of the bolt, a slide guide, and a slide guide holder; and the second tightening unit being detachable. a bit type adapter, a slide guide, and a slide guide holder. The slide guide of this biaxial simultaneous tightening device is configured to partially cover the portion around the head of the bolt or bit.

A spark plug is provided in the cylinder head of the engine so as to correspond to each combustion chamber.
Generally, a spark plug includes a shaft-shaped center electrode, an insulator surrounding the center electrode, and a metal shell that holds the insulator. The metallic shell is formed with a ground electrode facing the center electrode with a predetermined gap (microscopic gap), a hexagonal portion that can be fitted into a socket, and a male screw portion. When attaching the spark plug to the cylinder head, insert the spark plug with the hexagonal portion fitted to the tip of the socket of the mobile drive unit into the plug hole of the cylinder head, and form a penetration from the bottom of the plug hole toward the combustion chamber. The male threaded portion is fastened to the threaded hole with a predetermined torque.

JP 2008-149397 A

When the worker positions the fastening part fitted to the tip of the socket in the threaded hole of the assembly, if the axis of the fastening part and the axis of the threaded hole do not match, the fastening part and the assembly There is a risk that the fastening component or the attached body may be damaged due to interference with the body (portion around the screw hole).
For example, when the ground electrode of the spark plug interferes with the cylinder head, the deformation of the ground electrode causes the gap dimension to change from the specified value. If the gap is small, the energy of the flame kernel is taken away by the electrodes, hindering the growth of the flame. cause a situation to occur.
In particular, when the fastening part is approached obliquely to the object to be assembled, it is not easy to align the axis of the fastening part with the axis of the tapped hole from an ergonomic point of view, requiring considerable skill on the part of the operator. be done.

Therefore, with the aim of facilitating the alignment of the axis of the fastening part and the axis of the screw hole, an assembly jig dedicated to positioning the fastening part was separately prepared, and the drive unit holding the fastening part was screwed through the assembly jig. It is conceivable to guide it to a hole. However, when such an assembly jig is used, in addition to the fastening process of the fastening part, there is a process of setting the assembly jig in the screw hole of the assembly target before the fastening process, and a process of setting the assembly jig in the screw hole of the assembly target after the fastening process. Since a step of removing the assembly jig from the object to be assembled is required, there is a risk of prolonging the cycle time of the entire assembly process.
That is, it is not easy to achieve both avoidance of damage to fastening parts and shortening of cycle time in a mobile assembly machine.

SUMMARY OF THE INVENTION An object of the present invention is to provide a mobile assembling apparatus and the like that can both avoid damage to fastening parts and shorten cycle time.

According to the mobile assembly apparatus of claim 1, a driving device having a socket for holding a fastening part at its tip and a driving means for rotationally driving the socket is moved to an assembly target to which the fastening part is fastened. A mobile assembling apparatus for fastening the fastening part to the assembly target, wherein the socket is at least partially accommodated in a protective tube capable of being seated on the assembly target, and the drive means is connected to the driving device positioned above the protective cylinder, and supports the protective cylinder so as to be changeable between a protected position in which the fastening part is accommodated and a non-protected position in which the fastening part is exposed. a holding mechanism for holding the protection tube at the non-protection position; and a release mechanism for releasing the protection tube from the non-protection position when the protection tube is at the non-protection position. When the non-protecting position is released, the protective cylinder is changed from the non-protecting position to the protecting position by its own weight .

In this mobile assembling apparatus, a protective cylinder that can at least partially accommodate the socket and that can be seated against the assembly target, and a protective position that is connected to the driving device and accommodates the fastening part. Since it has a non-protected position where the fastening part is exposed and a moving means for variably supporting the protection cylinder, the driving device and the protection cylinder that protects the fastening part are simultaneously moved to the screw hole of the assembled body. It is possible to omit the carrying process dedicated to the protection cylinder.
a holding mechanism in which the driving means of the driving device is positioned above the protective cylinder and holds the protective cylinder in a non-protecting position; and a release mechanism for releasing from the non-protected position, and when the non-protected position is released by the release mechanism, the protective cylinder is changed from the non-protected position to the protected position by its own weight. Therefore , when the fastening part is fitted into the socket, the protective tube can be maintained in the non-protected position, and when the fastening part is moved to the assembly target, the operator can operate without requiring additional power. The protection cylinder can be automatically switched from the non-protection position to the protection position in synchronization with the release operation of the release mechanism .

The invention according to claim 2 is the invention according to claim 1 , wherein the moving means includes a connecting member that connects a plurality of protective cylinders corresponding to the plurality of driving devices, and a connecting member that is connected to the connecting member so as not to move relative to each other. and a connecting rod, and the holding mechanism holds the protective tube in the non-protecting position via the connecting rod.
According to this configuration, when the fastening part is fitted into the socket, the single holding mechanism can hold the plurality of protective cylinders in the non-protected position, and when the fastening part is moved to the assembly target, the plurality of protective cylinders can be held. The protective cylinder can be easily switched from the non-protected position to the protected position.

According to a third aspect of the invention, in the second aspect of the invention, there is provided a support member that connects the plurality of driving devices and is connected to the connecting rod so as to be capable of relative movement, and the holding mechanism comprises the mounted body. The protection cylinder is held at the non-protection position via the connection rod based on the separation distance between the connection member and the support member when the fastening of the fastening part to the support member is completed.
According to this configuration, the protective cylinder can be moved to the non-protected position by using the pushing force when fastening the driving device, and the subsequent fitting operation of the fastening part to the socket can be easily performed. , work efficiency can be improved.

According to the invention of claim 4 , in the invention of claim 3 , when the non-protection position is released by the release mechanism, the protection cylinder is held in the protection position and relative movement between the connecting member and the support member is prohibited. In addition, it is characterized by having a stopper mechanism that releases the prohibition of relative movement between the connecting member and the supporting member when the fastening part starts to be fastened to the assembly target.
According to this configuration, when the fastening part is moved to the assembly target, the protection position is maintained when the fastening part is fastened, while avoiding unintentional release of the protection position due to interference between the protection tube and the assembly target. can be released quickly.

According to the mobile assembling apparatus of the present invention, by providing the protective tube that can be displaced between the protected position and the non-protected position, it is possible to both avoid damage to the fastening parts and shorten the cycle time.

FIG. 2 is a vertical cross-sectional view showing a cylinder head and spark plugs according to Embodiment 1; 1 is a perspective view of the assembly device in a protected position; FIG. 1 is an exploded view of an assembly device; FIG. 1 is a front view of the assembly device in the non-protected position, omitting the drive device; FIG. FIG. 3 is a side view of the assembly device in the non-protected position, omitting the drive; Fig. 10 is a front view of the lifting member in a non-protected position; 7 is a cross-sectional view taken along line VII-VII of FIG. 6; FIG. FIG. 7 is a cross-sectional view taken along line VIII-VIII of FIG. 6; 4 is a step chart relating to a procedure for assembling a spark plug; FIG. 4 is a vertical cross-sectional view of essential parts when the protective cylinder is set in the plug hole; FIG. 10 is a vertical cross-sectional view of the main part when the push-down lever is operated downward;

EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing this invention is demonstrated based on drawing. The following description of preferred embodiments is merely exemplary in nature and is not intended to limit the invention, its applications or uses.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 11. FIG.
First, the cylinder head 1 of the vehicle engine, which is the assembly target of the present embodiment, will be described. This engine is, for example, an in-line four-cylinder gasoline engine.
As shown in FIG. 1, an aluminum alloy cylinder head 1 has a pent roof portion of a combustion chamber 2 formed in the lower portion thereof so as to correspond to each cylinder. These combustion chambers 2 are communicated with an exhaust port 3 for discharging exhaust gas, an intake port (not shown) for introducing intake air, an injector hole 4, and a plug hole 5, respectively. The exhaust-side camshaft 7 is arranged on the upper side of the exhaust port 3 so as to extend in the direction of the row of cylinders, and is configured to be able to drive the exhaust valve mechanism 6 arranged at an angle. The intake-side camshaft 9 is arranged above the intake port so as to extend in the direction of the row of cylinders, and is configured to be capable of driving the inclined intake valve mechanism 8 .

As shown in FIG. 1, the injector hole 4 is fitted with an injector (not shown) capable of injecting fuel into the combustion chamber 2 and extends substantially vertically from the top of the combustion chamber 2 . A spark plug 10 capable of igniting the air-fuel mixture in the combustion chamber 2 is attached to the plug hole 5 . The plug hole 5 is formed between the bottom wall portion and the intake valve mechanism 8 and slopes downward from the intake side wall portion of the cylinder head 1 toward the combustion chamber 2 . A plug hole 5 corresponding to each cylinder is formed in the side wall portion on the intake side so as to be equally spaced corresponding to the interval between cylinders.
In the vicinity of the combustion chamber 2 of the plug hole 5, a seating portion 5a for the spark plug 10 and a threaded hole 5b having a female screw portion into which the spark plug 10 can be screwed are formed (see FIGS. 10 and 11). .

Next, an assembling device D for assembling the spark plug 10 to the cylinder head 1 will be described.
As shown in FIGS. 2 and 3, the assembling device D includes four driving devices 20 that can rotate while holding the four spark plugs 10, and a moving member that guides the spark plugs 10 into the threaded holes 5b. 30 (moving means) and a supporting member 40 connected to the moving member 30 and supporting the four driving devices 20 collectively are main components. Hereinafter, in the drawings, the direction of arrow F is defined as forward, the direction of arrow L is defined as left, and the direction of arrow U is defined as upward.

First, the four driving devices 20 will be described. Since these drive devices 20 all have the same configuration, a specific drive device 20 will be mainly described as a representative.
As shown in FIG. 3, the driving device 20 includes a cylindrical main body 21 (driving means) that generates a rotational driving force, a drive shaft 22 coaxially extending downward from the output shaft of the main body 21, and It is composed of a tubular socket 23 and the like connected to the drive shaft 22 .
A fitting portion 23 a that can be fitted to the hexagonal portion of the spark plug 10 while attracting the spark plug 10 using magnetic force is provided at the tip of the socket 23 .

The body portion 21 includes an electric motor, a speed reducer, a pressure sensor, a torque sensor, an encoder, and the like (all not shown). The pressure sensor detects pressure when the ignition plug 10 is grounded in the screw hole 5b. A torque sensor detects the tightening torque by the socket 23 . The encoder detects the rotational speed of the socket 23 during fastening. The main body 21 outputs the detected ground pressure, tightening torque and rotation speed of the socket 23 to a controller (not shown).

The controller is configured to be able to execute torque control based on tightening torque and speed control based on rotational speed. This controller stops the rotation of the socket 23 until the spark plug 10 fitted in the fitting portion 23a is grounded on the seating portion 5a, and temporarily tightens torque (target torque) from the time when the grounding of the spark plug 10 is detected. ), a command signal is output to control the socket 23 at a predetermined rotational speed. The electric motor to which the command signal is input from the controller rotates the socket 23 (the drive shaft 22) via the speed reducer.

Next, the moving member 30 will be described.
As shown in FIGS. 2 and 3, the moving member 30 includes an elongated metal moving connecting member 31, four metal protective cylinders 32 capable of accommodating a portion of each of the four sockets 23, left and right 1 A pair of connecting rods 33 and the like are provided. The movable connecting member 31 is formed to extend in the left and right direction, and a pair of left and right grip levers 34 that extend upward and can be gripped by the operator are arranged at both left and right ends.
The movable connecting member 31 has four openings 31a that can be superimposed on the four plug holes 5, an intermediate portion between the two adjacent left openings 31a, and an intermediate portion between the two adjacent right openings 31a. A pair of left and right holes 31b are provided.

The four protective cylinders 32 are fixed to the movable connecting member 31 so as to communicate with the four openings 31a. Since these four protective cylinders 32 all have the same configuration, a specific protective cylinder 32 will be mainly described as a representative. The purpose of the protection cylinder 32 is to substantially match the axis of the spark plug 10 held in the socket 23 with the axis of the threaded hole 5b by substantially matching the axis of the threaded hole 5b with the axis of the threaded hole 5b. It has an assembly jig function.

As shown in FIGS. 3 to 5, the protective cylinder 32 has a large-diameter portion 32a fixed to the movable connecting member 31 and a portion extending downward from the large-diameter portion 32a to have a diameter smaller than that of the large-diameter portion 32a. It has a small diameter portion 32b and a stepped portion 32c formed at the boundary between the large diameter portion 32a and the small diameter portion 32b.
The outer diameter of the small-diameter portion 32b is set to be approximately the same as the inner diameter of the plug hole 5 . Therefore, when the small diameter portion 32b is inserted into the plug hole 5, the stepped portion 32c is seated on the side wall portion of the cylinder head 1 on the intake side. The inner diameter of the protective cylinder 32 is uniformly set to substantially the same dimension as the outer diameter of the socket 23 from the upper end to the lower end. Therefore, the socket 23 inserted into the protective tube 32 is relatively movable in the axial direction of the protective tube 32 .

The pair of connecting rods 33 includes a stopper plate 33a formed at the upper end portion and extending forward, a damper portion 33b extending downward from the front end portion of the stopper plate 33a by a predetermined distance, and a fixing portion 33c formed at the lower end portion. They are prepared. The stopper plate 33a is part of a mechanism that regulates the relative distance between the moving member 30 and the supporting member 40. As shown in FIG. The damper portion 33b is composed of a shock absorber, and absorbs the impact of the downward movement of the moving member 30 when the lower end portion of the damper portion 33b comes into contact with the upper surface portion of the support member 40. As shown in FIG. The fixing portion 33 c is fixed to the hole portion 31 b of the movable connecting member 31 .

Next, the support member 40 will be described.
As shown in FIGS. 2 to 8, the support member 40 includes an elongated support connection member 41 made of metal, a push-down lever 42 for pushing down the support connection member 41, and a protective cylinder 32, which are held at the non-protecting position. and a stopper mechanism 60 for holding the protection cylinder 32 at the protection position.
Here, the protected position is a position where the protective cylinder 32 completely surrounds the spark plug 10, as shown in FIG. 4 and 5, the ignition plug 10 is completely exposed from the protective cylinder 32, in other words, the position where the fitting portion 23a of the socket 23 is exposed from the protective cylinder 32. FIG. 4 and 5, the spark plug 10 is indicated by a chain double-dashed line.

The support connection member 41 has four openings 41a through which the four main body portions 21 can be inserted, and a pair of left and right cylindrical openings 41a through which the pair of connection rods 33 can be inserted. An insertion portion 41b is provided. Annular brackets 43 are fixed to the lower half of each main body 21, respectively, and the flanges of these brackets 43 are respectively fastened to the outer edges of the corresponding openings 41a via a plurality of bolts. A frame portion 44 is erected so as to extend upward in the middle rear portion of the two adjacent left openings 41a, and a frame portion 45 extends upward in the middle rear portion of the two adjacent right openings 41a. It is set up like this. The frame portion 44 is formed to have a vertical dimension higher than that of the frame portion 45 .

As shown in FIGS. 3 to 6 and 8, the push-down lever 42 has a pair of left and right swing arms whose front ends are pivotally supported by frame portions 44 and 45 via shaft portions 48 so as to be vertically swingable. 46 are connected. The pair of swing arms 46 each integrally has a lower extension 46a extending downward from the base end. The lower extension 46a is urged rearward by a compression spring 47 supported by the support connecting member 41. As shown in FIG. Therefore, when the moving member 30 is seated on the intake side wall of the cylinder head 1 and the pressing lever 42 is moved downward, the pressing lever 42 compresses the compression spring 47 through the lower extension 46a and the axial portion of the pressing lever 42 moves downward. Rotate 48 times.

When the lowering operation of the pressing lever 42 is continued, the support member 40 is lowered independently from the time when the lower extension portion 46a comes into contact with the rear end portion of the support connecting member 41, and the moving member 30 and the support member 40 is reduced (see FIG. 2). When the lowering operation is stopped and the push-down lever 42 is released, the pushing force of the compression spring 47 rotates the push-down lever 42 around the shaft portion 48 via the lower extension portion 46a to return to the initial upright posture. be.
As shown in FIGS. 3, 6 and 8, the right swing arm 46 is integrally formed with an upper extension 46b extending upward from the base end. The upper extension portion 46 b is configured to be at a height position substantially the same as the height position of the frame portion 45 .

Next, the holding mechanism 50 will be explained.
The holding mechanism 50 has a holding function of holding the protection tube 32 at the non-protection position and a release function of releasing the protection tube 32 from the non-protection position when the protection tube 32 is at the non-protection position.
As shown in FIG. 7, the holding mechanism 50 includes a cam 51 whose upper end protrudes forward and which can be engaged so as to prevent the downward movement of the stopper plate 33a, and a cam 51 that is attached to the frame portion 44 at the intermediate stage of the cam 51. A shaft portion 52 that pivotally supports the cam 51 so as to swing back and forth, a compression spring 53 that is supported by the frame portion 44 and biases the upper half of the cam 51 forward, and is connected to the lower half of the cam 51 . A release lever 54 extends rearward and rotates the lower half of the cam 51 forward about the shaft portion 52 by pressing the rear end portion.

When the separation distance between the moving member 30 and the supporting member 40 decreases due to the relative movement of the moving member 30 and the supporting member 40, the stopper plate 33a moves upward in conjunction with the upward movement of the connecting rod 33. As shown in FIG. The stopper plate 33a rotates the upper half of the cam 51 backward around the shaft portion 52 while resisting the biasing force of the compression spring 53 to get over the cam 51 and move to a position above the cam 51 . After the stopper plate 33a has climbed over the cam 51, the upper half of the cam 51 is biased by the compression spring 53 to rotate forward and return to the initial position, and is engaged to support the stopper plate 33a from below. stop. As a result, the relative movement of the moving member 30 and the support member 40 in the expanding direction is restricted via the connecting rod 33, and the protective tube 32 is held at the non-protecting position.

The assembling device D is suspended from above via a tensioner mechanism by a pair of left and right wires 49 (see FIGS. 4 and 5) connected to both left and right ends of the support connection member 41, and the wires 49 are pulled out or wound. arranged to be retrievable. Further, the weight of the assembling device D is distributed so that the body portion 21 is located above the protective tube 32 in a suspended state.
Therefore, when the locking between the stopper plate 33a and the cam 51 is released by pressing the release lever 54, the moving member 30 moves downward by its own weight while being guided by the insertion portion 41b. Further, as the moving member 30 descends, the protection cylinder 32 moves from the non-protection position toward the protection position.

Next, the stopper mechanism 60 will be explained.
The stopper mechanism 60 has a holding function of holding the protective cylinder 32 at the protective position and prohibiting relative movement between the moving member 30 and the supporting member 40, and a holding function of holding the moving member 30 and supporting the moving member 30 when the ignition plug 10 starts to be fastened to the cylinder head 1. and a releasing function of releasing the prohibition of relative movement of the member 40 .
As shown in FIGS. 6 and 8, the stopper mechanism 60 includes a pin 61 that penetrates the frame portion 45 and can move back and forth, a lower extension portion 46a and an upper extension portion 46b, and the pin 61 as an upper extension portion 46b. A shaft portion 62 rotatably supported on the upper end portion of the frame, a compression spring 47, and the like are provided. The front end of pin 61 is tapered such that the lower dimension is longer than the upper dimension.

The biasing force of the left and right compression springs 47 is set lower than the pushing force of the lower extension portion 46a caused by the downward movement of the moving member 30. As shown in FIG. Therefore, when the unprotected position is released by operating the release lever 54 of the holding mechanism 50, the moving member 30 descends due to its own weight, and the stopper plate 33a presses the tapered surface of the pin 61 rearward. The rear component force acting on the tapered surface of the pin 61 from the stopper plate 33a pushes the pin 61 rearward, causing the upper extension 46b to rotate rearward about the shaft 48 and the lower extension 46a to rotate about the shaft 48. to rotate forward.

The stopper plate 33 a moves over the tapered surface of the pin 61 to a position below the pin 61 . Specifically, the descending speed of the moving member 30 (connecting rod 33) is reduced by bringing the lower end of the damper portion 33b into contact with the upper surface of the support connecting member 41 while mitigating the impact. The decelerated stopper plate 33a collides from above with a stopper portion 45a formed in the front portion of the frame portion 45, and the descent of the moving member 30 is completed. After the stopper plate 33a has passed over the pin 61 downward, the pin 61 is pushed by the upper extension portion 46b that rotates forward under the force of the compression spring 47 and returns to the initial position, and the stopper plate 33a is pushed upward. Lock for support. As a result, the relative movement of the moving member 30 and the supporting member 40 in the contraction direction is restricted via the connecting rod 33, and the protective tube 32 is held at the protective position.

When the push-down lever 42 is lowered at the start of fastening of the spark plug 10, the pin 61 retreats in conjunction with the rotation of the push-down lever 42, thereby releasing the locking of the stopper plate 33a. When the lowering operation of the pressing lever 42 is continued, the rotation of the pressing lever 42 is stopped and the support member 40 is moved from the time when the lower extension portion 46a abuts the rear end portion of the support connecting member 41. As it descends, the separation distance between the moving member 30 and the supporting member 40 decreases.
The positional relationship between the stopper plate 33a and the cam 51 is configured so that the stopper plate 33a gets over the cam 51 while the separation distance between the moving member 30 and the support member 40 is increasing.

Next, a procedure for assembling the spark plug 10 by an operator will be described based on the step chart of FIG. Incidentally, Si (i=1, 2, . . . ) is a step indicating each process.

First, an operator attaches four spark plugs 10 to each socket 23 (S1).
Since the assembling apparatus D waiting at the initial position has just completed the fastening process, the separation distance between the moving member 30 and the supporting member 40 is reduced, and each protective cylinder 32 is in the non-protected position. . Therefore, the hexagonal portion of each ignition plug 10 is fitted into the exposed fitting portion 23a.
Next, the release lever 54 is operated (S2).
When the release lever 54 is pushed down, the moving member 30 moves downward relative to the supporting member 40 by its own weight, and the position of each protective tube 32 is changed from the non-protecting position to the protecting position. At the protection position, relative movement between the moving member 30 and the supporting member 40 is restricted by the stopper mechanism 60 .

Next, the grip lever 34 is operated to set the assembling device D in the plug hole 5 (S3).
Since the tip of the protective cylinder 32 protrudes from the tip (ground electrode) of the spark plug 10, before the stepped portion 32c of the protective cylinder 32 is seated on the side wall of the cylinder head 1 on the intake side, the assembling device D is not installed. Interference between the spark plug 10 and the cylinder head 1 is avoided even if an erroneous operation occurs.
As shown in FIG. 10, the axis of the protective cylinder 32 and the axis of the socket 23 are aligned, and the axis of the protective cylinder 32 and the axis of the plug hole 5 are aligned. The axis L1 of the ignition plug 10 (socket 23) and the axis L2 of the screw hole 5b (plug hole 5) are aligned.

Next, the protection position of the protection tube 32 is released (S4).
After the stepped portion 32c of the protective cylinder 32 is seated on the side wall portion of the intake side of the cylinder head 1, when the push-down lever 42 is operated downward, the push-down lever 42 is held until the lower extension portion 46a comes into contact with the support connecting member 41. , rotates about the shaft portion 48 . Simultaneously with the rotation of the pressing lever 42 (upper extension portion 46b), the pin 61 retreats and the protection position of the protection cylinder 32 is released. As a result, the moving member 30 and the supporting member 40 can move relative to each other.

Next, the ignition plug 10 is advanced (S5).
After the lower extension portion 46a abuts on the support connecting member 41, when the pressing lever 42 is operated downward, the socket 23 slides in the protective cylinder 32 and advances toward the screw hole 5b.
The rotational drive of the spark plug 10 by the driving device 20 is kept stopped until the tip of the spark plug 10 protruding from the protective cylinder 32 touches the screw hole 5b.

Next, the ignition plug 10 is engaged (S6).
As shown in FIG. 11, the rotation of the socket 23 is started when the spark plug 10 is grounded in the screw hole 5b. The tightening of the spark plug 10 is continued until the spark plug 10 is seated on the seating portion 5a and the tightening torque reaches the temporary tightening torque. In addition, the stopper plate 33a climbs over the cam 51 while the pressing lever 42 is being lowered. When the tightening torque reaches the temporary fixing torque, the downward operation of the pressing lever 42 is stopped and the pressing lever 42 is released. The tensioner mechanism winds the wire 49 and returns the mounting device D, which has been placed in the non-protected position, to the initial position away from the cylinder head 1 .

Next, the operation and effects of the assembling apparatus D will be described.
According to this assembly device D, the protective cylinder 32 which can at least partially accommodate the socket 23 and which can be seated against the cylinder head 1, and the protective position which is connected to the driving device 20 and accommodates the spark plug 10. Since the moving member 30 supports the protective cylinder 32 in a changeable manner, the driving device 20 and the protective cylinder 32 that protects the spark plug 10 can be screwed into the cylinder head 1 at the same time. It can be moved to the hole 5b, and the carrying process dedicated to the protection tube 32 can be omitted .

A holding mechanism 50 in which the main body 21 (driving means) of the driving device 20 is positioned above the protective cylinder 32 and holds the protective cylinder 32 in the non-protected position, and the protective cylinder 32 is in the non-protected position. , it has a holding mechanism 50 corresponding to a release mechanism for releasing the protection tube 32 from the non-protection position. Therefore, when the spark plug 10 is fitted into the socket 23, the protection cylinder 32 can be maintained in the unprotected position, and when the spark plug 10 is moved to the cylinder head 1, the release lever 54 of the holding mechanism 50 unprotects it. When the position is released, the protective cylinder 32 is changed from the non-protected position to the protected position by its own weight . Therefore , the protection cylinder 32 can be automatically changed from the non-protection position to the protection position in synchronism with the release operation of the release lever 54 by the operator without requiring additional power.

The moving member 30 includes a moving connecting member 31 that connects a plurality of protective cylinders 32 corresponding to the plurality of driving devices 20, and a connecting rod 33 that is connected to the moving connecting member 31 so as not to move relative to each other. holds the protective tube 32 in the non-protected position via the connecting rod 33.
According to this, when the spark plug 10 is fitted into the socket 23, the single holding mechanism 50 can hold the plurality of protective cylinders 32 in the non-protected position, and the spark plug 10 can be moved toward the cylinder head 1. At this time, the plurality of protective cylinders 32 can be easily switched from the non-protected position to the protected position.

It has a support member 40 that connects the plurality of driving devices 20 and is connected to the connecting rod 33 so as to be relatively movable. Since the protection tube 32 is held in the non-protection position via the connecting rod 33 based on the separation distance of the member 40, it is possible to move the protection tube 32 to the non-protection position by using the pushing force at the time of fastening to the driving device 20. This makes it possible to easily carry out the subsequent work of fitting the spark plug 10 into the socket 23, thereby improving work efficiency.

When the non-protection position is released by the release lever 54 of the protection mechanism 50, the protection cylinder 32 is held in the protection position to prohibit the relative movement of the movable coupling member 31 and the support member 40, and the spark plug 10 is released with respect to the cylinder head 1. At the start of fastening, since there is a stopper mechanism 60 that releases the prohibition of relative movement between the movable connecting member 31 and the support member 40, when the spark plug 10 moves to the cylinder head 1, interference between the protective cylinder and the cylinder head 1 may occur. It is possible to quickly release the holding of the protection position when the spark plug 10 is engaged while avoiding the release of the protection position where the ignition plug 10 is not released.

Next, a modified example in which the above embodiment is partially changed will be described.
1) In the above embodiment, an example was described in which the fastening parts were four spark plugs 10 and the mounted body was the cylinder head 1. The object to be assembled may be any member having a screw hole to which the fastening part can be fastened. Further, the number of fastening parts to be fastened may be one, or five or more.

2) In the above embodiment, an example of a pair of left and right connecting rods 33 was described, but the number of connecting rods may be one or three or more.

3) In addition, those skilled in the art can implement various modifications to the above-described embodiment or combinations of the embodiments without departing from the scope of the present invention. Any modifications are also included.

D Assembly device 1 Cylinder head 10 Spark plug (fastening part)
20 drive device 21 main body 23 socket 30 moving member 31 moving connecting member 32 protective tube 33 connecting rod 40 supporting member 50 holding mechanism 60 stopper mechanism

Claims (4)

A driving device having a socket for holding a fastening part at its tip and a driving means for rotating the socket is moved to a body to which the fastening part is fastened, and the fastening part is moved to the body to be assembled. In a mobile assembly device that fastens
a protective cylinder that can at least partially accommodate the socket and that can be seated against the assembly;
The protective cylinder is changed between a protected position where the driving means is connected to the driving device positioned above the protective cylinder and where the fastening part is accommodated and a non-protected position where the fastening part is exposed. a means of transportation capable of supporting;
a holding mechanism for holding the protective cylinder in a non-protected position;
a release mechanism for releasing the protection tube from the non-protection position when the protection tube is in the non-protection position ;
A mobile assembly apparatus according to claim 1, characterized in that when the unprotected position is released by the release mechanism, the protective cylinder is changed from the unprotected position to the protected position by its own weight. Having a plurality of the driving devices,
said moving means comprises a connecting member for connecting a plurality of protective cylinders respectively corresponding to said plurality of driving devices, and a connecting rod connected to said connecting member so as not to move relative to said connecting member;
2. The mobile assembly apparatus according to claim 1, wherein the holding mechanism holds the protection cylinder in the non-protection position via the connecting rod. a support member that connects the plurality of driving devices and is connected to the connecting rod so as to be relatively movable;
The holding mechanism holds the protective tube in the non-protected position via the connecting rod based on the separation distance between the connecting member and the support member when the fastening of the fastening part to the assembly is completed. 3. The mobile assembly apparatus according to claim 2, wherein When the unprotected position is released by the releasing mechanism, the protective tube is held in the protective position to prohibit relative movement between the connecting member and the support member, and start fastening the fastening part to the assembled body. 4. The mobile assembling apparatus according to claim 3, further comprising a stopper mechanism for releasing prohibition of relative movement between said connecting member and said supporting member.

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