JP2649830B2 - Piston insertion device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piston insertion device, and more particularly to a piston insertion device that controls a movement position of a piston supply unit based on a movement amount of a piston pushing unit accompanying centering of a guide sleeve with respect to a cylinder bore. Regarding what was done.

(Prior art)

Generally, a piston insertion device that inserts a piston assembly in which a connecting rod is attached to a piston into a cylinder bore includes a piston pushing unit that inserts the piston assembly into the cylinder bore, and a piston supply unit that supplies the piston assembly to the piston pushing unit. The piston pushing unit and the piston supply unit are sequentially moved to predetermined positions corresponding to the cylinder bore, and the piston assembly is inserted into each cylinder bore.

On the other hand, each cylinder bore is formed at a predetermined position of the cylinder block, but the axis of the cylinder bore may be slightly shifted (about 0.6 mm at maximum) due to a manufacturing error. For this reason, the piston pushing unit is provided with a guide sleeve having a tapered inner peripheral surface enlarged on the piston insertion side so that the piston does not contact the outer peripheral edge of the cylinder bore when the piston assembly is inserted. Is centered with respect to the cylinder bore, and the piston is inserted while being guided by the guide sleeve.

Conventionally, in order to center the guide sleeve with respect to the cylinder bore, for example, Japanese Patent Publication No. 55-8661 discloses that a guide sleeve is elastically mounted on a piston pushing unit, and a lower end outer peripheral edge of the guide sleeve is inserted before the piston assembly is inserted. Is described in which a tapered portion formed at the center of the cylinder bore is engaged with a tapered portion formed at an outer peripheral edge of an upper end of a cylinder bore to perform centering. In addition,
In Japanese Patent Application Laid-Open No. 55-9542, a guide sleeve is provided on a piston pushing unit so as to be movable in a direction perpendicular to the axis of the piston pushing unit, and an expanding head is inserted over the guide sleeve and the cylinder bore. A configuration in which the center link is established by expansion is described.

[Problems to be solved by the invention]

In the piston insertion device, since the piston assembly is always supplied to the correct position, when the guide sleeve is centered with respect to the cylinder bore, the axis of the guide sleeve and the axis of the piston are shifted. If this displacement is relatively small, a tapered surface that expands toward the insertion side of the piston assembly is formed on the inner surface of the guide sleeve, so that there is no hindrance to the insertion of the piston assembly, but If so, the piston may contact and damage the end of the guide sleeve.

On the other hand, it is conceivable that the tapered surface may be relatively widened toward the insertion side of the piston assembly. When the piston assembly is inserted, the piston ring and the cylinder block may be damaged.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a piston insertion device that enables a piston assembly and a guide sleeve to be supplied to the piston insertion device to be centered with respect to a cylinder bore so that the piston assembly can be inserted reliably and efficiently. It is in.

[Means for solving the problem]

A piston insertion device according to the present invention includes a guide sleeve connected to a cylinder bore of a cylinder block held at a predetermined position, a cylinder sleeve, and an axially movable insertable relative to the guide sleeve, and centering the guide sleeve relative to the cylinder bore. A piston pushing unit having an expanding head that expands, and a piston supply unit that supplies a piston assembly including a piston and a connecting rod to the piston pushing unit, wherein the piston pushing unit is inserted with the expanding head. Detecting means for detecting the amount of movement of the piston pushing unit accompanying centering of the guide sleeve with respect to the cylinder bore at the time of expansion of the expansion head; Is Based on the amount of movement of the piston supply unit towards the piston pushing unit is provided with a control means for controlling the movement position when supplying the piston assembly is moved in the one direction.

[Action]

In the piston insertion device according to the present invention, a piston pushing unit including a guide sleeve and an expansion head that can be axially moved and inserted into the cylinder bore and the guide sleeve of the cylinder block held at a predetermined position, The expansion head is provided so as to be movable in at least one direction orthogonal to the insertion direction of the expansion head, and after the piston pushing unit is moved, the expansion head is inserted over the guide sleeve and the cylinder bore, and the expansion head is inserted. By expanding the guide sleeve, the guide sleeve is centered and connected to the cylinder bore. At the time of this centering, the piston pushing unit slightly moves in the one direction, the amount of movement is detected by the detecting means, and based on the detected amount of movement, the piston supply unit supplies the piston assembly by the control means. The movement position, which is the movement position that moves in one direction toward the piston pushing unit, is controlled, and the supplied piston assembly is centered with respect to the guide sleeve. In this way, with the guide sleeve and the piston assembly being centered with respect to the cylinder bore, the piston assembly is pressed by the expanding head and inserted through the guide sleeve into the cylinder bore.

〔The invention's effect〕

According to the piston insertion device of the present invention, as described above, since the guide sleeve and the piston assembly supplied to the insertion device can be centered with respect to the cylinder bore, the production error is large and the position of the cylinder bore is relatively large. The piston assembly can be reliably and efficiently inserted into the cylinder bore even when the displacement is large.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In this embodiment, the present invention is applied to a piston insertion device that inserts a piston assembly including a piston and a connecting rod into a cylinder block of a V-6 engine.

As shown in FIG. 1, the piston insertion device 1 is installed in the middle of the downstream portion of the engine assembly line 2, and the cylinder block 3 is mounted on the pallet 5 in an inverted state with the crankshaft 4 previously mounted. It is carried into the work supply station 6 on the left side of the piston insertion device 1, and a piston assembly line 7 is provided on the right side of the engine assembly line 2. A pair of piston assemblies 8 including a piston 8 a and a connecting rod 8 b is The piston removal station on the right side of the piston insertion device 1 which is placed on the pallet 10 in the sideways posture
It is carried in to 11.

The cylinder block 3 carried into the piston insertion device 1 is conveyed to a piston insertion station 12 at the center of the piston insertion device 1. Each piston assembly 8 includes a piston removal station 11 and a piston insertion station.
The piston is mounted on a piston holder 21 described later at a piston setting station 15 between the cylinders 12 and inserted into the cylinder bore 3a at the piston insertion station 12, and a cap 30 is mounted on the connecting rod 8b.

As shown in FIG. 1 to FIG. 3, the piston insertion device 1 includes a pair of portal frames 16 provided at a predetermined distance back and forth between the work supply station 6 and the piston removal station 11. A guide frame 17 provided on the work floor below the portal frame 16, and a work loader 18 for transporting the cylinder block 3 between the work supply station 6 and the piston insertion station 12.
And a piston loader 19 that transports the pair of piston assemblies 8 placed on the pallet 5 from the piston removal station 11 to the piston setting station 15, and causes the piston holder 8 of the piston supply unit 20 to be held by the piston holder 21. A piston set auxiliary unit 22 for compressing the piston ring 13, a pair of front and rear piston pushing units 23 for pushing the piston assembly 8 obliquely upward and inserting it into the cylinder bore 3a, and each piston pushing unit
A first traveling mechanism 24 for driving the traveling along the guide frame 17, a pair of front and rear piston supply units 20 for supplying the piston assembly 8 and the piston pushing unit 23 while being held by the piston holder 21, A second traveling mechanism 25 that drives the piston supply unit 20 to travel along the guide frame 17, respectively; and a control device 27 that controls the movement position of each piston pushing unit 23 and the piston supply unit 20.
7 (see FIG. 7) and holding the bolt 28 (see FIG. 4) pressed into the connecting rod 8b when the piston assembly 8 is inserted, and connecting the large end of the connecting rod 8b to the crankpin portion 4a of the crankshaft 4 (see FIG. 7). 4), and a cap placed on the pallet 10 after the piston assembly 8 is inserted.
Cap assembly mechanism that attaches 30 to the large end of connecting rod 8b
31.

The work loader 18 moves the crank pin 4a, to which the large end of the connecting rod 8b is mounted, to the dead center position by rotating the crank shaft 4 by a predetermined angle and a holding mechanism (not shown) for holding the cylinder block 3. It includes a crank indexing mechanism 32, and an elevating drive mechanism 33 that drives the holding mechanism and the crank indexing mechanism 32 up and down. The above work loader
Reference numeral 18 denotes a transfer cylinder 35 which is movable along a pair of guide rails 34 attached to the left end of the lower end surface of the horizontal frame 16a of each portal frame 16 and is provided at the lower left end of the horizontal frame 16a. It is transported and driven in the left-right direction.

The piston loader 19 includes a piston holding mechanism 36 for holding the piston assembly 8, a posture switching mechanism 37 for rotating the piston holding mechanism 36 downward to switch the piston assembly 8 to the inverted posture, a piston holding mechanism 36, Attitude switching mechanism
And a lifting drive mechanism 38 that drives the lifting and lowering of the 37. The piston loader 19 is movable along guide rails 39 attached to the right lower end surface of each horizontal frame 16a, and the transfer cylinder 4 provided at the lower right end of the horizontal frame 16a.
At 0, it is transported in the left and right direction.

The piston set auxiliary unit 22 is provided at the right end of the guide frame 17, and is mounted in the three ring mounting grooves of the piston 8a when the piston loader 19 pushes the piston assembly 8 downward in the inverted posture. After the piston ring 13 is compressed, the piston assembly 8 is inserted and held in the piston holder 21 below. Since the piston set auxiliary unit 22 has a general configuration, a detailed description thereof will be omitted.

As shown in FIG. 1, FIG. 4, and FIG. 7, the first traveling mechanism 24 includes a front and rear
A pair of guide frames 47, a pair of first drive motors 48 for individually driving the respective piston pushing units 23 to predetermined positions along the guide rails 47 based on drive signals from the control device 27, and a control device. A pair of first brake devices for braking each first drive motor 48 based on a brake signal from 27
49 and.

The respective piston pushing units 23 will be described. As shown in FIGS. 1, 2 and 4, a support member 50 extending upward is disposed on the guide rail 47 so as to be movable in the left-right direction. An inclined plate 51 inclined in the direction of inserting the piston is fixed to the outer end of the guide plate 50, and a pair of guide rails 52 is attached on the upper surface of the inclined plate 51 at a predetermined distance to the left and right. Is the expansion unit 53 for 2 and 3 liter engines
Is movably supported via a guide member 54, and an insertion cylinder 55 in a piston insertion direction is provided below the inclined plate 51 corresponding to each guide rail 52.
The lower end of each piston rod 55a is connected to a guide member 54 via a connecting member 56, and the expanding unit 53 is
It is driven forward and backward over a retreat position shown by a solid line and a forward position shown by a virtual line. At the upper end of the inclined plate 51, a support plate 57 extending vertically outward from the inclined plate 51 is fixed, and at a position corresponding to each expansion unit 53 of the support plate 57, a substantially cylindrical shape that can be connected to the cylinder bore 3a. A pair of guide sleeves 58 are mounted so as to be movable in the piston insertion direction, and a tapered surface 58a that expands slightly downward is formed on the inner peripheral surface of each guide sleeve 58, and is connected to the outer end of the support plate 57. A pair of left and right support members 60 is projected upward through a member 59, and connection arms 61 projecting inward are pivotally supported at the upper ends of the support members 60, respectively. A guide rail 62 that can be engaged with the upper end of the connecting arm 61 is provided on the lower side wall of the support member 60 in the left-right direction.
The clamp arms 63 which press obliquely upward are pivotally supported respectively, and each connecting arm 61 is connected to each clamp arm 63 via a pair of clamping cylinders 64, and by driving the clamping cylinder 64, The upper end of the connecting arm 61 engages with the guide rail 62 to rotate the clamp arm 63 upward, and the guide sleeve 58 is pressed obliquely upward in the piston insertion direction at the inner end of the clamp arm 63, thereby causing a cylinder bore.
Connected to 3a.

Each of the above expanding units 53 will be described with reference to FIGS.
As shown in FIG. 6, an expansion cylinder 65 having a piston rod 65a extending obliquely upward in the direction of inserting the piston is fixed to the upper surface of the guide member 54.
The support sleeve 66 through which the piston rod 65a is inserted
Is fixed, and the upper end of the support sleeve 66 has a cylinder bore.
An expansion head 67 that can be inserted through the 3a and the guide sleeve 58 is fixed. Four expansion members 68 that can be expanded in the radial direction are attached to a substantially middle portion of the expansion head 67, and each expansion member 68 An inclined pressure receiving surface 68a is formed at the inner end of the
At the upper end of 5a, an inclined pressing surface 69a that contacts the inclined pressure receiving surface 68a.
A cone-shaped pressing member 69 having a
68 is expanded by the driving of the expansion cylinder 65 as shown by a virtual line in FIG.

As shown in FIGS. 1 to 4 and 7, the second traveling mechanism 25 is provided with a guide rail 41 provided on each of the left and right sides of the guide frame 17 and a drive signal from the control device 27. And a pair of second drive motors 42 for separately driving the respective piston supply units 20 to predetermined positions along the guide rails 41, and controlling each second drive motor 42 based on a brake signal from the control device 27. And a pair of second brake devices 43.

To explain each of the piston supply units 20,
As shown in FIGS. 1 to 4, a support frame 44 extending upward is provided on the guide rail 41 so as to be movable in the left-right direction, and a bracket 45 projecting inward is provided at the upper end of the support frame 44. A cylindrical piston holder 21 is swingably supported at the inner end of the bracket 45,
21 is a swing cylinder provided on the side of the support frame 44
By means of 46, it is driven to swing between a vertical position shown by a virtual line in FIG. 4 and an insertion position shown by a solid line in FIG. Piston holder
21 is composed of a substantially cylindrical outer cylinder 21a, and an inner cylinder 21b internally fitted to the outer cylinder 21a so as to be movable by a predetermined distance in the axial direction thereof,
The piston assembly 8 is housed in the inner cylinder 21b and held by the frictional resistance between the piston cylinder 13 and the inner surface of the inner cylinder 21b.

The inner diameter of the guide sleeve is slightly smaller than the inner diameter of the cylinder bore 3a of the cylinder block 3, and the inner diameter of the piston holder 21 is set slightly smaller than the inner diameter of the guide sleeve.

As shown in FIGS. 1, 2, and 4, the guide unit 29 is provided on each of the front and rear sides of the horizontal frame 16a, and is a guide slit 70a through which the crank pin portion 4a can be inserted.
A fork-shaped guide member 70 having a holding portion 70b capable of holding the bolt 28 of the connecting rod 8b at a lower end portion, and a guide cylinder 71 for driving the guide member 70 to advance and retreat in the piston insertion direction. It can move in the left and right direction along the guide rail 72 attached to the upper end surface of 16a,
It is transported and driven via a screw shaft 74 by a drive motor 73 provided on the left side of the horizontal frame 16a.

As shown in FIGS. 1 and 3, the cap assembling mechanism 31 is provided on each of the front and rear sides of the horizontal frame 16a, and is a nut runner for fastening the cap 30 to the connecting rod 8b.
75, and a swing mechanism 76 for swinging and driving the nut runner 75 in the piston insertion direction.The swing mechanism 76 can move in the left-right direction along a guide rail 77 attached to the upper surface of the horizontal frame 16a. The drive motor 78 provided at the right end portion is driven to transfer via a screw shaft 79.

Next, the operation of the piston insertion device 1 will be described.

Cylinder block 3 carried into piston insertion device 1
Is transported to the piston insertion station 12 in an inverted posture by the work loader 18, and the crank indexing mechanism 32 rotates the crank pin portion 4a of the crank shaft 4 to the dead center position. On the other hand, the loaded piston assembly 8 is held in a vertical position by the piston loader 19, is conveyed to the piston set station 15, and is inserted and held in the piston holder 21 of the piston supply unit 20 by cooperation of the piston set auxiliary unit 22. Then, the cylinder 46 is extended, and the piston holder 21 is held in a state where it is switched in an inclined state.

Next, in order to insert the piston assembly 8 into the cylinder bore 3a of the cylinder block 3, the piston pushing unit 23
And the movement position of the piston supply unit 20 is controlled based on a control program as described later, the guide sleeve 58 and the piston holder 21 are set coaxially with the cylinder bore 3a, the guide cylinder 71 is driven, and the bolt of the connecting rod 8b is driven. 28 is held by the holding portion 70b of the guide member 70. Then, the expansion head 67 is driven to the forward position by the insertion cylinder 55, and the piston assembly 8 accommodated in the piston holder 21 is pushed obliquely upward along the piston insertion direction at the upper end surface of the expansion head 67. , The cylinder 21b and the guide sleeve 58 maintain the contact state, and the tapered surface 58a of the guide sleeve 58
Guide sleeve 58 from piston holder 21 while being guided by
Through the cylinder bore 3a. At this time, the large end of the connecting rod 8b is guided by the guide member 70 and is mounted on the crank pin 4a.

Next, in order to attach the cap 30 to the large end of the connecting rod 8b, the cap 30 placed on the pallet 10 is held by the cap assembling loader 31, the guide unit 29 is retracted to the left, and the cap is attached. The loader 31 is driven to move above the cylinder block 3, and the cap 30 is connected to the connecting rod 8b.
Is temporarily fastened with a nut runner 75, and the piston assembly 8 is assembled to the cylinder block 3. At this time, the piston assembly 8 is held in the cylinder bore 3a while being pressed by the upper end surface of the expanding head 67.

Here, the overall configuration of a control system for controlling the movement positions of the piston supply unit 20 and the piston pushing unit 23 will be described with reference to FIG. The piston supply unit 20 and the piston pushing unit 23 are
A pair is provided before and after 17 respectively, but both are control devices
Since the control is performed in the same way by 27, the front side will be described.

The control device 27 includes a CPU 80, a ROM (Read Only Memory) 81 and a RAM (Random Access Memory) 82 connected to the CPU 80 via a data bus or the like, and a drive circuit 8
It consists of 3.84.85.

A first drive motor 48 for moving and driving the piston pushing unit 23 and a first brake device 49 for braking the motor 48
Is connected to the CPU 80 via a drive circuit 83, and a second drive motor 42 for moving and driving the piston supply unit 20 and a second brake device 43 for braking the motor 42 are connected to the CPU 80 via a drive circuit 84, An electromagnetic valve 64a that supplies and exhausts air to and from a clamping cylinder 64 that connects the sleeve 58 to the cylinder bore 3a, an electromagnetic valve 55a that supplies and exhausts air to an insertion cylinder 55 that drives the expansion unit 53 to advance and retract, and an expansion head 67 are expanded. Solenoid valve that supplies and exhausts air to the expansion cylinder 65 that opens
65a is connected to the CPU 80 via the drive circuit 85.

Further, the detection signal from the rotary encoder 48a for detecting the rotation angle of the first drive motor 48 and the detection signal from the rotary encoder 42a for detecting the rotation angle of the second drive motor 42 are input to the CPU 80, respectively. Based on the signal, the current position of the piston pushing unit 23 and the current position of the piston supply unit 20 with respect to the origin position P in FIG. 9 are constantly calculated and stored in the RAM 82.

The ROM 81 contains three cylinder bores 3a of a regular 2 liter engine and a 3 liter engine from the origin position P.
Of the distance l ₁ , l ₂ , l _{3 to} the axis center position C, and a control program for a movement distance correction control described later, and the like.

The RAM 82 includes a counter for counting the number of cylinder bores 3a into which the piston assembly 8 is inserted, a data memory for storing the moving distance (current position) of the piston pushing unit 23 and the piston supply unit 20 from the origin position P. Various memories for temporarily storing the results of the arithmetic processing by the CPU 80 are provided.

Next, a control program of the movement position correction control performed by the control device 27 will be described with reference to a flowchart of FIG. 8 and an operation explanatory diagram of FIG. Here, 3
A case where the piston assembly 8 is inserted into the cylinder block 3 of the liter engine will be described.
Indicates each step.

When the cylinder block 3 is carried into the piston insertion station 12 and the piston assembly 8 is held by the piston holder 21, this control is started and initialization such as clearing the soft counter n is executed (S1). When the engine size information is automatically input from a limit or the like, the information is also read. Next, the counter n is "1" only is incremented (S2), the distance data l ₁ from the origin position P to the central axial position C ₁ of the cylinder bore 3a of inserting the piston assembly 8 is read (S3). Next, the data of the current position l _p of the axis of the expanding head 67 for a three-liter engine piston pushing unit 23 from the memory of the RAM82 are read out (S4), then l _p = l _n of determining whether Is performed (S5), and l _p =
When it is not l _n (l _p −l _n ), the piston pushing unit 23 is driven by a small amount to the decreasing side (S6), and S5 and S6 are repeated.
to migrate to l _p = l is _n and S7. In S7, the piston pushing unit 23 is held in axial position C ₁ by driving the first brake device 49 (S7).

Next, in order to accurately match the axis of the guide sleeve 58 with the axis of the cylinder bore 3a, the insertion cylinder 65 is driven, and the expansion head 67 is moved to the guide sleeve 58 and the cylinder bore 3a.
(S8), and the piston pushing unit 23 is inserted.
The drive of the first brake device 49 is released (S9) so that can be moved along the guide rail 47 (S9), and the expansion head 67 is driven to expand (S10). Then, since the current position l _p piston pushing unit 23 by a small error of the centering by expansion of the expanding head 67 is moved is changed, the current position l _p 'is read piston pushing unit 23 (S1
1) Then, the moving amount Δl of the piston pushing unit 23 is Δ
l = is calculated by the equation (l _p '-l _p). However, the data of l _p is used what is left is transferred to another memory of RAM 82. Next, the first brake unit 49 is driven piston pushing unit 23 is positioned in the correct position T ₁ (S1
3) By driving the clamping cylinder 64, the guide sleeve 58 is coaxially connected to the cylinder bore 3a (S14), and the expanding drive of the expanding head 67 is released (S15).
The expanding head 67 is driven downward from the cylinder bore 3a and the guide sleeve 58 (S16).

Then, for moving the piston supply unit 20 to the correction position T _1, it is moved piston supply unit 20 by driving the second drive motor 42 to the position _{(l n + Δl) (S17} ), the second brake device piston supply unit 20 is positioned in the correct position T ₁ by driving the 43 (S18).

In this way, the piston assembly 8 is guided by the guide member 70 while the guide sleeve 58 and the piston holder 21 are aligned with the axis of the cylinder bore 3a, and the expansion head 67 is expanded.
, And insert the guide sleeve 58 into the cylinder bore.
It is inserted into 3a (S19).

After the piston assembly 8 is inserted, the piston supply unit 20 is moved to the home position (S20), and it is determined whether n = 3 (S21). If not n = 3, the process proceeds to S2 and S2. ~S21 is repeated, the first time in this way also the second time in the correction position T ₁ is also the third time in the correction position T ₂ are inserted in the respective piston assembly 8 is executed in the correction position T _3, n = 3, this control ends.
The description has been given on the assumption that the piston holder 21 of the piston supply device 20 can be switched between the vertical position and the inclined position at the origin position P.

As described above, by correcting the movement position of the piston supply unit 20 by the minute movement distance Δl when the guide sleeve 58 of the piston pushing unit 23 is centered on the cylinder bore 3a via the expansion head 67, the shaft of the cylinder bore 3a is corrected. Even if the position of the heart is relatively large,
The axis of the piston holder 21 can be aligned with the axis of the cylinder bore 3a.
The piston assembly 8 can be smoothly inserted into the cylinder bore 3a without interfering with the outer peripheral edge of the cylinder bore 3a.

In the above embodiment, the position correction at the time of piston insertion is performed only in one direction in a plane orthogonal to the piston insertion direction. However, if the correction is performed in two directions in the orthogonal plane based on the idea of the present invention. , More preferably, the cylinder block 3
May be appropriately dealt with in accordance with the variation in the positional accuracy of the cylinder bore 3a.

[Brief description of the drawings]

The drawings relate to an embodiment of the present invention. FIG. 1 is a front view of a piston insertion device, FIG. 2 is a sectional view taken along the line II-II in FIG. 1, and FIG. 3 is a sectional view taken along the line III-III in FIG. Fig. 4 is a vertical sectional side view of a piston pushing unit and a piston supply unit, Fig. 5 is a longitudinal sectional view near an expanding head, Fig. 6 is a plan view of the expanding head, and Fig. 7 is a piston pushing unit and a piston. FIG. 8 is a block diagram of a control system of the supply unit, FIG. 8 is a flowchart of a movement position correction control routine, and FIG. 9 is an explanatory diagram for explaining movement position correction of the piston pushing unit and the piston supply unit. 1 ... Piston insertion device, 3 ... Cylinder block, 3a
... Cylinder bore, 8 ... Piston assembly, 8a ... Piston, 8b ... Connecting rod, 20 ... Piston supply unit, 23 ... Piston pushing unit, 24 ... First traveling mechanism, 25 ... Second traveling mechanism , 27 ... Control device, 48a ・ 42a…
… Rotary encoder, 58 …… Guide sleeve, 67 ……
Spread head.

Continuation of the front page (72) Inventor Toyoji Aiyoshi 3-1 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture Inside Mazda Corporation (72) Inventor Hideharu Mori 3-1 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture Mazda Inside (72) Inventor Mitsumasa Maeda 3-1 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture Inside Mazda Co., Ltd. (56) References JP-A-2-76650 (JP, A) JP-A-56-76350 (JP) JP-A-56-76349 (JP, A) JP-A-62-84940 (JP, A) JP-A-2-43130 (JP, U) JP-A-62-58125 (JP, U) 55-9542 (JP, B2) Japanese Patent Publication 55-8661 (JP, B2)

Claims (1)

(57) [Claims] 1. A guide sleeve connected to a cylinder bore of a cylinder block held at a predetermined position, and an expanding head which can be axially moved and inserted into the cylinder bore and the guide sleeve, and centers the guide sleeve with respect to the cylinder bore. And a piston supply unit for supplying a piston assembly comprising a piston and a connecting rod to the piston pushing unit, wherein the piston pushing unit is moved in the insertion direction of the expanding head. Detecting means is provided so as to be movable in at least one direction perpendicular to the direction of movement, and a detecting means for detecting a moving amount of the piston pushing unit accompanying centering of the guide sleeve with respect to the cylinder bore at the time of expanding the expanding head is provided. Based on quantity Piston insertion device, characterized in that the provided control means for controlling the movement position when the piston supply unit is moved in the one direction towards the piston pushing unit supplying piston assembly.