JPH07328863A - Cylinder head assembling pallet - Google Patents

Abstract

PURPOSE:To provide a pallet on which even a cylinder head of a different type can be accurately positioned and firmly installed by a single operation and from which it can be easily removed. CONSTITUTION:A cylinder head assembling pallet is composed of a base stand 2, a clamp bar 3 to interposingly press and grip a cylinder head H with the base stand 2 and holding mechanisms 7 respectively formed on both ends on the base stand so as to hold the clamp bar. The base stand 2 has a positioning pin 8 for the cylinder head, and the clamp bar 3 has engaging bars 4 and 5 to be engaged with and held by the holding mechanisms in a prescribed height range to the base stand, and the holding mechanisms 7 have an engaging member energized in the engaging direction with the engaging bars and an unlocking bar to move the engaging member to an unengaging position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pallet for assembling a cylinder head (hereinafter referred to simply as "pallet"). More specifically, the supply / exhaust valve (hereinafter simply referred to as valve)
The present invention relates to a pallet for holding a cylinder head in a predetermined posture when the cylinder head is conveyed to each assembling station by a conveyor in order to incorporate parts such as a spring and a spring.

[0002]

2. Description of the Related Art Conventionally, engines and the like of motorcycles are products of a small amount and a large variety (for example, 30 to 100 models), so that a valve, a valve spring, a stem seal ring, etc. are provided on the cylinder head. When assembling the components, it is common to mount the cylinder head on a workbench, arrange the above-mentioned necessary components around, and then sequentially assemble the components. As related prior art, for example, the actual Kaihei 1-10
The one described in Japanese Patent No. 6135 is known.

On the other hand, even in that case, the valve must be inserted into the valve guide hole from the inside of the cylinder head, while the valve spring and the stem seal ring must be installed from the outside of the cylinder head. Therefore, when the valve is installed, it is necessary to rotate the cylinder head by approximately 180 ° to invert the front and back, and it is very troublesome to manually perform this work because of the large number and heavy weight.

Further, it is extremely difficult to incorporate the necessary parts into the cylinder heads of the various types of engines as described above, for example, by an assembly robot in one production line.

The present invention has been made in order to eliminate such inconvenience, and the cylinder head can be firmly gripped, the cylinder head can be attached and detached with almost one touch, and the cylinder head can be accurately positioned. The aim is to provide a possible pallet.

[0006]

A pallet according to the present invention comprises a base for mounting a cylinder head, a clamp bar for clamping and holding the cylinder head by the base, and both ends on the base. And a holding mechanism for holding the clamp bar formed on the base, the base having an opening penetrating the front and back of the base and positioning means for the cylinder head. The bar has an engaging portion that can be engaged and held by the holding mechanism in a predetermined height range with respect to the base, and the holding mechanism is biased in an engaging direction with the engaging portion. It is characterized by having a lock release mechanism for moving the engaging claw and the engaging claw to the non-engaging position.

The engaging portion of the clamp bar is a bar member having a large number of ratchet teeth, and the engaging member has a substantially intermediate portion pivotally supported by the main body of the holding mechanism and the engaging member. A ratchet pawl that can engage with any part of the plurality of ratchet teeth is provided at one end side, and the engagement member is rocked at the other end side of the engaging member to engage the ratchet pawl with the ratchet tooth. It is preferable that the unlocking mechanism that can be operated so as to release the connection is connected.

Further, the lock release mechanism urges the engaging member in the engaging direction of the ratchet pawl by the elastic means, and is lifted against the elastic means to lift the engaging member. It is preferable that the ratchet pawl can be moved to the disengaged position.

It is preferable that the positioning means is composed of positioning pins detachably attached to a plurality of positions so as to correspond to a plurality of types of cylinder heads.

The holding mechanism operates the lock release mechanism,
An unlock holding mechanism for holding the unlocked state and releasing the held state is provided, and the unlock holding mechanism elastically engages with the engagement hole of the lock releasing mechanism in the unlocked state. It is preferable to have a locking pin.

The base or the holding mechanism is preferably provided with a erasable memory in which the type of cylinder head to be attached or the corresponding identification symbol and / or work content is written and erasable.

[0012]

According to the pallet of the present invention, the cylinder head is mounted on the pallet so as to be aligned with the positioning means of the pallet, and then the clamp bar is held by the holding mechanism so that the engaging portion thereof is held by the holding mechanism. Simply by setting from above, the engaging portion of the clamp bar engages with the engaging member of the holding mechanism, so that the cylinder head is firmly fixed to the pallet without being displaced or falling. Therefore, the component-incorporating robot conveys the components to the waiting stations by the conveyer, and the robot can perform an accurate assembling work without manpower. Also, since the clamp bar can be held at any height, different shapes,
It is also possible to hold cylinder heads of different sizes. Further, when assembling the valve, the cylinder head can be easily and accurately inverted using a reversing table or the like, and the valve can be incorporated from the back side of the pallet through its opening.

Further, when removing the cylinder head after assembly, the engagement portion of the clamp bar and the engagement member of the holding mechanism are disengaged simply by operating the lock release mechanism.
The cylinder head can be easily removed.

In the case where the clamp bar is held by the ratchet teeth and the ratchet pawl, the one-touch operation is easier and the cylinder head is more firmly attached.

The unlocking mechanism urges the engaging member in the engaging direction of the ratchet pawl by its elastic means, and is lifted against the elastic means to lift the engaging member of the ratchet pawl. In the case where the clamp bar can be moved to the non-engagement position, the clamp bar can be easily removed.

In a pallet provided with a plurality of positioning pins, accurate positioning can be performed even by using a recess such as a bolt hole originally formed in the cylinder head, so that it is particularly suitable for a cylinder head. It is convenient and economical because there is no need to process it.

With an unlock holding mechanism, the lock releasing mechanism does not need to be held by the operator's hand when the clamp bar is removed, so that it is easy to handle.

As described above, by using the pallet of the present invention, even different types of cylinder heads can be accurately positioned and firmly attached with one touch, and can be easily removed.

Model code of cylinder head to be assembled and /
Alternatively, a pallet having a memory in which work contents can be written and erased is most suitable for sequentially and automatically assembling a plurality of types of cylinder heads while being conveyed by a conveyor or the like.

[0020]

Embodiments of the pallet of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of the pallet of the present invention, FIG. 2 is a partially cutaway perspective view showing the essential parts of the pallet of FIG. 1, and FIG. 3 is a sectional view taken along line III-III of FIG. , Fig. 4
FIG. 4 is a sectional view taken along line IV-IV in FIG. 3.

In FIG. 1, reference numeral 1 is a pallet, on the base 2 of which a cylinder head H of the motorcycle engine is mounted.
(Refer to the chain double-dashed line). A clamp bar 3 is attached so as to sandwich the cylinder head H with the base 2 from above. The clamp bar 3 is a long member that exceeds the entire length of the cylinder head H, and the engaging rods 4 and 5 have the same orientation on both ends thereof (see FIG. 1).
That is, it is projected downward from the lower surface of the clamp bar. A large number of ratchet teeth 6 are formed on each of the engaging rods 4 and 5 along the axial direction thereof. The ratchet teeth 6 are for engaging with a ratchet pawl 17 (see FIG. 3) of a holding mechanism 7 described later. An elastic member 3a such as urethane rubber is partially attached to the lower surface of the clamp bar 3 (see FIG. 3). The elastic member 3a is provided to prevent damage to the cylinder head and to absorb movement of the clamp bar at a fixed pitch (about 1 mm in this embodiment) due to meshing of the ratchet.

On the other hand, a holding mechanism 7 capable of firmly gripping the clamp bar 3 is provided at both ends of the upper surface of the base 2. A plurality of positioning pins 8 are detachably provided on the upper surface of the base 2 so as to position the attached cylinder head H. These positioning pins 8 are provided at positions where they can be fitted into recesses such as bolt holes originally formed in the cylinder head H. Therefore, the work to be placed does not need to be specially devised for positioning. Further, the plurality of pins and the detachable ones are designed so that different cylinder heads can be attached to the same pallet. Of course, it is necessary to simultaneously provide two or more positioning pins for each cylinder head.

On the other hand, the base 2 is formed with an opening 9 penetrating the front and back sides near the center thereof.

The opening 9 is for incorporating components (particularly valves) from the lower surface side of the cylinder head H. In such a case, by using the pallet 1, it is possible to rotate the cylinder head by about 180 ° with the cylinder head attached by a reversing table or the like, and to install the valve from above like other parts.

An ID chip stand 10 for storing the model and / or work content of the cylinder head to be mounted on the pallet is provided outside one of the holding mechanisms 7 (the one on the left side in the drawing). Generally, for motorcycle engines and the like, the order of assembling each type of engine is determined over a certain period based on the production plan. Then, in the ID chip (memory) embedded in the ID chip stand 10, prior to the cylinder head assembling work, the main sequencer provided in the control station of the assembling line is used to perform the following operations based on the assembling order. The type of cylinder head to be assembled, or the corresponding symbols and work contents are written.

Notches 1a formed on the four sides of the base 2
Is a space for a stopper when the pallets are continuous and is also used as a positioning assisting means when fixing the pallets to a tilt table or the like.

Reference numeral 1b in the figure is also a gripping portion by a chuck.
The gripping portion 1b is formed on both upper and lower surfaces of the pallet, and the upper surface side lifts the pallet on the conveyor and carries it to the reversing table, for example, in an automatic assembly line.
It is used when returning to the opposite direction, and the lower surface side is used when fixing the pallet to a tilt table or the like. The grip portion 1b is provided so that a ball lock type chuck can be used.

Next, the holding mechanism 7 will be described with reference to FIG. In this figure, the engagement bar 4 of the clamp bar 3 is
The state where the holding mechanism 7 is fitted in the fitting hole 11 formed in the main body 7a is shown. A so-called linear ball bearing 12 is mounted in the fitting hole 11 so that the engagement rod 4 can be smoothly moved in and out. A receiving member 14 in which a coil spring 13 is inserted is provided in the inner portion of the fitting hole 11 and urges the engaging rod 4 to push upward although it is not a large force. This facilitates the removal of the clamp bar 3 prior to the removal of the cylinder head.

An engagement member 15 for locking the engagement rod 4 at a predetermined position is pivotally supported by a pin 16 on the main body 7a. Ratchet pawls 17 (see FIG. 3) that can be engaged with the ratchet teeth 6 of the engaging rod 4 are formed at the tips of the engaging members 15.

The rear end of the engaging member 15 is connected to an unlock rod 18 for releasing the engagement of the ratchet pawl 17 with the ratchet teeth 6. The connection is made so that the engaging member 15 can be swung by a pin 20 penetrating the elongated hole 19 of the engaging member 15 and the hole (not shown) of the unlocking rod 18. The unlock rod 18 is the hole 2 of the main body 7a.
1 and is urged downward by a coil spring 22 mounted between the large-diameter portion 18a at the lower end (see also FIG. 3) and the intermediate step portion 21a of the hole 21 of the main body 7a. ing. As a result, usually one unlock bar
8 is the lowermost position, that is, the ratchet pawl 17 of the engaging member 15 is in a position where it can be locked to the ratchet teeth 6 (shown by the solid line in the figure).

As shown in FIG. 3, the operation of the holding mechanism 7 is such that if the engaging rod 4 is inserted into the fitting hole 11 so that the clamp bar is pressed from above the mounted cylinder head, the ratchet pawl is inserted. 17 engages with the ratchet teeth 6 (shown by the solid line in the figure). A reaction force (a force that pulls up the engagement rod 4) is generated when the cylinder head is pressed by the clamp bar 3, but the ratchet pawl 17 strongly abuts in the direction in which the ratchet teeth 6 are engaged (that is, the engagement member). 15
Is pushing the engaging rod 4 strongly to the right in the figure),
As shown by the one-dot chain line in the figure, since the lower rear end of the engaging member 15 contacts the horizontal step 7b of the main body 7a at the position A, the ratchet pawl 17 does not move upward, so the locking is released. There is no such thing.

Next, in order to release the locking, the unlocking rod 18 may be pulled up. Then, as shown by the chain double-dashed line in FIG. 3, the engaging member 15 is largely tilted so that the ratchet pawl 17 is released. It escapes from the ratchet teeth 6 and escapes downward B
Clamp bar 3 is in position and coil spring 13
It can be easily removed by pushing it up.

In FIG. 2, 23 is an unlocking mechanism. That is, in FIG. 3, the unlocking rod 18 is to be stopped in a pulled-up state (a state in which the ratchet pawl 17 has escaped downward). When the unlock rod 18 is pulled up, the through hole 24 formed in the unlock rod 18 and the guide hole 2 formed in the main body 7a
Since the line connecting with 5 is horizontal, the unlocking mechanism 2
3 can be pushed into the main body 7a. That is, FIG.
Further, as shown in FIG. 4, the guide pin 26 of the unlocking mechanism 23 is inserted into the guide hole 25, and at the same time, the stop pin 27 is inserted into the through hole 24 of the unlocking rod 18, so that the unlocking position of the unlocking rod 18 is, so to speak. Can be held. In practice, the guide pin 26 is urged by the coil spring 28 in the main body 7a so as to be elastically inserted into the guide hole 25 (see FIG. 4). It is inserted and retained in the through hole 24 of the lock rod 18. When the holding of the unlock position is released, the unlock release mechanism 23
When the knob 29 is pulled, the unlocking rod 18 moves downward due to the elastic force of the coil spring to reach the position where the clamp bar 3 is locked.

When a pallet constructed as described above is used, automatic assembly of cylinder heads is facilitated, and it is possible to greatly reduce the number of assembling steps of cylinder heads of various types in small quantities and the working time. For example, according to the type of cylinder head written in the ID chip each time, the corresponding cylinder head is attached to the pallet automatically or manually (in the case of manual work, the type written in the ID chip is transferred via the detector). Is displayed on the display panel and is mounted by the operator based on the display), and at the assembly station for each component, the corresponding model and number of components are arranged and assembled according to the assembly sequence based on the instructions from the main sequencer. .

[0036]

According to the present invention, even different types of cylinder heads can be accurately positioned and firmly attached with one touch, and can be easily removed. Therefore, it can be easily adapted to automatic assembly.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a pallet of the present invention.

2 is a partially cutaway perspective view showing a main part of the pallet of FIG. 1. FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

4 is a sectional view taken along line IV-IV of FIG.

[Explanation of symbols]

 1 ... Pallet 2 ... Base 3 ... Clamp bar 4, 5 ... Engaging rod 7 ... Holding mechanism 8 ... Positioning pin 9 ... Opening 15 ... Engagement Member 18: Unlock rod H: Cylinder head

Claims (6)

[Claims] 1. A base for mounting a cylinder head, a clamp bar for clamping and holding the cylinder head by the base, and clamp bars formed at both ends of the base. And a holding mechanism for the base, the base has an opening penetrating the front and back and has a positioning means for the cylinder head, the clamp bar is a predetermined height with respect to the base. Has an engaging portion that can be engaged and held by the holding mechanism in a range, and the holding mechanism disengages the engaging member biased in the engaging direction with the engaging portion and the engaging member. A pallet for assembling a cylinder head having a lock release mechanism for moving to a combined position. 2. The engaging portion of the clamp bar is a bar member having a large number of ratchet teeth, and the engaging member is pivotally supported about its intermediate portion on the main body of the holding mechanism. A ratchet pawl that can be engaged with any part of the multiple ratchet teeth is provided on one end side thereof, and the ratchet pawl and ratchet teeth are formed on the other end side of the engaging member by swinging the engaging member. The pallet for assembling a cylinder head according to claim 1, wherein the lock release mechanism that can be operated to release the engagement of the cylinder head is connected. 3. The lock releasing mechanism biases the engaging member in the engaging direction of the ratchet pawl by its elastic means, and lifts the engaging member against the elastic means to lift the engaging member. The pallet for assembling a cylinder head according to claim 2, wherein the pallet for assembling the cylinder head is configured to be movable to a non-engaging position of the ratchet pawl. 4. A pallet for assembling a cylinder head according to claim 1, wherein said positioning means is composed of positioning pins detachably attached to a plurality of positions, which can accommodate a plurality of types of cylinder heads. 5. The holding mechanism includes the lock release mechanism,
An unlock holding mechanism for holding the unlocked state and releasing the held state is provided, and the unlock holding mechanism elastically engages with the engagement hole of the lock releasing mechanism in the unlocked state. The pallet for assembling a cylinder head according to claim 1, further comprising a retaining pin. 6. The cylinder head assembly pallet according to claim 1, further comprising a erasable memory in which the type of cylinder head to be mounted or its corresponding identification symbol and / or work content is written.