JPH0288132A - Inserting device for piston - Google Patents

Abstract

PURPOSE:To surely and efficiently insert a piston assembly body even in case of the errors in manufacturing being large by enabling the centering of the piston assembly body fed to a piston inserting device and a guide sleeve for a cylinder bore by providing a detecting means. CONSTITUTION:A piston push-in unit 23 equipped with a guide sleeve 58, a cylinder bore 3a of the cylinder block 3 held at specified position and an expansion head 67 insertable to the guide sleeve 58 is provided movably in one direction orthogonal with the inserting direction of the expansion head 67. Moreover, a detecting means detecting the movement of the piston push-in unit 23 accompanied by the centering of the guide sleeve 58 for the cylinder bore 3a is provided and also a control means 27 controlling the moving position of a piston feeding unit 20 feeding a piston assembly body 8 at its moving time to the piston push-in unit 23 side is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a piston insertion device, and in particular to a piston insertion device that controls the movement position of a piston supply unit based on the amount of movement of a piston pushing unit associated with centering of a guide sleeve with respect to a cylinder bore. Concerning what has been done.

[Prior art]

Generally, a piston insertion device that inserts a piston assembly in which a connecting rod is assembled into 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 assembly is inserted into each cylinder pore by sequentially moving the piston pushing unit and the piston supply unit to predetermined positions corresponding to the cylinder bores.

On the other hand, although each cylinder bore is molded at a predetermined position in the cylinder block, the axis of the cylinder bore may be slightly shifted (up to about 0.6 mm) due to manufacturing errors.

For this reason, the piston pushing unit is provided with a guide sleeve that has a tapered inner circumferential surface that is enlarged on the piston insertion side so that the piston does not come into contact with the outer circumferential edge of the cylinder bore when the piston assembly is inserted. The piston is centered in 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, in Japanese Patent Publication No. 55-8661, the guide sleeve was elastically mounted on the piston pushing unit, and the lower outer peripheral edge of the guide sleeve was inserted before the piston assembly was inserted. There is described a configuration in which a taper portion formed in the cylinder bore is engaged with a taper portion formed in the outer peripheral edge of the upper end of the cylinder bore for centering. Furthermore, Japanese Patent Publication No. 55-9542 discloses that a guide sleeve is provided in a piston pushing unit so as to be movable in a direction orthogonal to the axis of the unit, and an expanding head is inserted between the guide sleeve and the cylinder bore. A device is described in which the center link is performed by expanding the expanding head.

[Problem to be solved by the invention]

In the above-mentioned piston insertion device, the piston assembly is always supplied to the correct position, so 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 misaligned. If this deviation is relatively small, there will be no problem in inserting the piston assembly because the inner surface of the guide sleeve is formed with a tapered surface that expands toward the insertion side of the piston assembly. If it becomes too large, the piston may come into contact with the end of the guide sleeve and be damaged.

On the other hand, it is conceivable to enlarge this tapered surface relatively largely toward the insertion side of the piston assembly, but if it is enlarged too much, it will cause problems with the Teno F1'. i, the piston ring cannot be held in the ring groove, and the piston ring may separate from the ring groove of the piston, damaging the piston ring or cylinder block when the piston assembly is inserted.

An object of the present invention is to provide a piston insertion device that enables centering of a piston assembly and a guide sleeve supplied to the piston insertion device with respect to a cylinder bore, and allows reliable and efficient insertion of the piston assembly. There is a particular thing.

[Means to solve the problem]

The piston insertion device according to the present invention includes a guide sleeve connected to a cylinder bore of a cylinder block held in a predetermined position, and a cylinder bore and a piston insertion device that can be inserted by moving in the axial direction with respect to the cylinder bore and centering the guide sleeve with respect to the cylinder bore. A piston insertion device comprising: a piston pushing unit having an expanding head; and a piston supply unit supplying a piston assembly including a piston and a connecting rod to the piston pushing unit; A detecting means is provided to be movable in at least one direction orthogonal to the direction, and detects the amount of movement of the piston pushing unit as the guide sleeve is centered with respect to the cylinder bore when the expanding head is expanded, and the detecting means detects The apparatus is provided with a control means for controlling the movement position when the piston supply unit is moved in the one direction toward the piston pushing unit to feed the piston assembly based on the amount of movement determined.

[Effect]

In the piston insertion device according to the present invention, the piston pushing unit includes a guide sleeve, a cylinder bore of a cylinder block held in a predetermined position, and an expanding head that can be inserted by moving in the axial direction with respect to the guide sleeve. The expanding head is movable in at least one direction perpendicular to the insertion direction of the expanding head, and after moving the piston pushing unit, the expanding head is inserted between the guide sleeve and the cylinder bore, and the expanding head is moved. By expanding the guide sleeve, the guide sleeve is centered and connected to the cylinder bore. During this centering, the piston pushing unit moves slightly in the one direction, the amount of this movement is detected by the detection means, and based on the detected amount of movement, the control means controls the piston supply unit that supplies the piston assembly. The movement position, which moves in said one direction towards the piston pushing unit, is controlled to center the supplied piston assembly relative to the guide sleeve. In this manner, with the guide sleeve and the piston assembly centered with respect to the cylinder bore, the piston assembly is pressed by the expanding head and inserted through the guide sleeve and into the cylinder bore.

〔Effect of the invention〕

According to the piston insertion device of the present invention, as explained above, the guide sleeve and the piston assembly supplied to the insertion device can be centered with respect to the cylinder bore, so that the position of the cylinder bore is relatively small due to large manufacturing errors. Even if there is a large deviation, the piston assembly can be inserted into the cylinder bore reliably and efficiently.

〔Example] Embodiments of the present invention will be described below with reference to the drawings.

In this embodiment, the present invention is applied to a piston insertion device for inserting a piston assembly consisting of a piston and a connecting rod into a cylinder block of a type 6 six-cylinder engine.

As shown in FIG. 1, a piston insertion device 1 is installed in the middle of the downstream part of an engine assembly line 2, and a cylinder block 3 is mounted upside down on a pallet 5 with a crankshaft 4 assembled in advance. Piston insertion device 1
A piston assembly line 7 is provided on the right side of the engine assembly line 2, and a pair of piston assemblies 8 consisting of a piston 8a and a connecting rod 8b are placed on a pallet 10 in a horizontal position. The piston is then placed in the piston insertion device 1 and transported to the piston removal station 11 on the right side of the piston insertion device 1.

The cylinder block 3 carried into the piston insertion device is transferred to a piston insertion station 12 in the center of the piston insertion device 1. Each piston assembly 8 is attached to a piston holder 21 (described later) at a piston set station 15 between a piston take-out station 11 and a piston insertion station 12, and is inserted into a cylinder bore 3a at the piston insertion station 12, and a cap 3o is attached to a connecting rod 8b. is assembled.

As shown in FIGS. 1 to 3, the piston insertion device 1 is a piston inserting device that is installed at a predetermined distance in the front and back between a workpiece supply station 6 and a piston takeout station 11.
a pair of concave frames 16; a guide frame 17 oriented in the left-right direction provided on the work floor below the concave frame 16;
A work loader 18 transports the cylinder block 3 between the work supply station 6 and the piston insertion station 12, and a pair of piston assemblies 8t mounted on the pallet 5 - from the piston take-out station 11 to the piston set station 15 Piston loader 1 to be transported
9, and a piston ring 1 for holding the piston assembly 8 in the piston holder 21 of the piston l unit 20.
The piston set auxiliary unit 22 compresses the cylinder bore 3 and the piston assembly 8 is pushed diagonally upward to compress the cylinder bore 3.
A pair of front and rear piston pushing units 23 to be inserted into the guide frame 17
, a pair of front and rear piston supply units 2° that supply the piston assembly 8 to the piston pushing unit 23 while holding the piston assembly 8 in the piston holder 21, and each piston supply unit 20. a second traveling mechanism 25 that drives the pistons to travel along the guide frame 17, and a control device 27 that controls the movement positions of each piston pushing unit 23 and piston supply unit 20 (
When the piston assembly 8 is inserted, the bolt 28 (see FIG. 4) press-fitted into the connecting rod 8b is held and the large end of the connecting rod 8b is connected to the crank pin portion 4a of the crankshaft 4 (see FIG. 7). (see figure) guide unit 29
and a cap assembly mechanism 31 for assembling the cap 30 placed on the pallet 10 after the piston assembly 8 is inserted to the large end of the connecting rod 8b.

The work loader 18 has a holding mechanism (path shown) that holds the cylinder block 3 and rotates the crankshaft 4 by a predetermined angle to move the crank pin portion 4a to which the large end of the connecting rod 8b is attached to the dead center position. It includes a crank indexing mechanism 32 and a lifting drive mechanism 33 that drives the holding mechanism and crank indexing mechanism 32 up and down. The work loader 18 is movable along a pair of guide rails 34 attached to the left side of the lower end surface of the horizontal frame 16a of each gate-shaped frame 16. It is conveyed and driven in the left and right direction by the cylinder 35.

The piston loader 19 includes a piston holding mechanism 36 that holds the piston assembly 8, a posture switching mechanism 37 that swings the piston holding mechanism 36 downward to switch the piston assembly 8 to an inverted position, and the piston holding mechanism 36 and An elevating drive mechanism 38 that drives the attitude switching mechanism 37 up and down is provided. This piston loader 19 is connected to each horizontal frame 16.
It is movable along guide rails 39 attached to the right side of the lower end surface of the horizontal frame 16a, and is driven to be transferred in the left-right direction by a transfer cylinder 40 provided at the lower right end of the horizontal frame 16a.

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 assembly 8 is pushed downward in an inverted position by the piston loader 19. After the piston ring 13 is compressed, the piston assembly 8 is inserted and held in the lower piston holder 21. Incidentally, the piston set auxiliary unit 22 has a general configuration, so a detailed explanation thereof will be omitted.

As shown in FIG. 1, FIG. 4, and FIG. A pair of first drive motors 48 transport and drive each piston pushing unit 23 separately to a predetermined position along a guide rail 47 based on the brake signal from the control device 27. A pair of first brake devices 49 are provided for braking.

To explain each piston pushing unit 23, as shown in FIG. 1, FIG. 2, and FIG. An inclined plate 51 inclined in the direction of piston insertion is fixed to the outer end of the inclined plate 50, and a pair of guide rails 52 are attached to the upper surface of the inclined plate 51 at a predetermined distance apart from each other on the left and right. An expansion unit 53 for a 2-liter engine and a 3-liter engine is movably supported via a guide member 54, and an inclined plate 5 corresponding to each guide rail 52 is provided.
1 has an insertion cylinder 5 facing in the piston insertion direction.
5 are provided with their piston rods 55a facing diagonally downward, the lower end of each piston rod 55a is connected to the guide member 54 via a connecting member 56, and the expansion unit 53 is connected to the guide member 54 by an insertion cylinder 55 as shown in FIG. The motor is driven forward and backward between a retreat position shown by a solid line and a forward position shown by a phantom line. An inclined plate 51 is provided at the upper end of the inclined plate 51.
A support plate 57 is secured to the support plate 57 extending perpendicularly outwardly from the
A pair of substantially cylindrical guide sleeves 58 that can be connected to the cylinder pore 3a are mounted on the support plate 57 at positions corresponding to the respective expansion units 53 so as to be movable in the piston insertion direction. A tapered surface 58a that slightly expands downward is formed on the support plate 57.
A pair of left and right support members 60 protrudes upward from the outer end of the support member 60 via a connection member 59, and a connection arm 61 that protrudes inward is rotatable from the upper end of each support member 60. A connecting arm 6 is pivotally supported on the lower end side wall of the work loader 18.
A guide rail 62 that can be engaged with the upper end of each support member 60 is attached in the left-right direction, and a clamp arm 63 that protrudes inward and presses the guide sleeve 58 diagonally upward is rotatable at the middle part of each support member 60. each connecting arm 6
1 is connected to each clamp arm 63 via a pair of thin clamp cylinders 64, and when the clamp cylinder 64 is driven, the upper end of the connecting arm 61 engages with the guide rail 62, causing the clamp arm 63 to rotate upward. The guide sleeve 58 is pressed obliquely upward in the piston insertion direction at the inner end of the clamp arm 63 and connected to the cylinder bore 3a.

To explain each of the above-mentioned expansion units 53, FIG.
As shown in FIG. 6, a piston rod 65 is provided on the upper surface of the guide member 54 and extends obliquely upward in the piston insertion direction.
A supporting sleeve 66 is fixed to the expanding cylinder 65, through which the piston rod 65a is inserted, and the upper end of the supporting sleeve 66 can be inserted into the cylinder bore 3a and the guide sleeve 58. A widening head 67 is fixed thereto. Four expansion members 68 that can be expanded in the radial direction are attached to approximately the middle part of the expansion head 67, and an inclined pressure receiving surface 68 is provided at the inner end of each expansion member 68.
A cone-shaped pressing member 69 having an inclined pressing surface 69a that contacts the inclined pressure receiving surface 68a is fixed to the upper end of the piston rod 65a, and each expanding member 68 is opened by driving the expanding cylinder 65. It is expanded as shown in phantom lines in FIG.

As shown in FIGS. 1 to 4 and 7, the second traveling mechanism 25 is based on guide rails 41 attached to both left and right sides of the guide frame 17, and drive signals from a control device 27. a pair of second drive motors 42 that separately drive each piston supply unit 20 to a predetermined position along a guide rail 41, and brake each second drive motor 42 based on a brake signal from a control device 27. the second of the pair
A brake device 43 is provided.

To explain each piston supply unit 20 above,
As shown in FIGS. 1 to 4, a support frame 44 extending upward is disposed 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, and the piston holder 21 is moved by a swinging cylinder 46 provided on the side of the support frame 44 as shown in the imaginary line in FIG. It is driven to swing between the vertical position shown in the figure and the insertion position shown by the solid line. The piston holder 21 is composed of a substantially cylindrical outer cylinder 21a and an inner cylinder 21b fitted into the outer cylinder 21a so as to be movable a predetermined distance in the axial direction of the outer cylinder 21a, and the piston assembly 8 is housed in the inner cylinder 21b. It is held by the frictional resistance between the piston ring 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 to be even smaller than the guide sleeve.

As shown in FIG. 1, FIG. 2, and FIG. 4, the guide unit 29 is provided on both the front and rear sides of the horizontal frame 16a, has a guide slit 70a through which the crank pin portion 4a can be inserted, and has a lower end portion. Connecting rod 8b bolt 28
a fork-shaped guide member 70 having a holding portion 70b capable of holding the piston, and a guide cylinder 71 that drives the guide member 70 forward and backward in the piston insertion direction, and a guide rail 72 attached to the upper end surface of the horizontal frame 16a. It is movable in the left-right direction along the horizontal frame 16a, and is conveyed and driven via a screw shaft 74 by a drive motor 73 provided on the left side of the horizontal frame 16a.

The cap assembly mechanism 31 is provided on both front and rear sides of the horizontal frame 16a, as shown in FIGS. 1 and 3,
It is equipped with a nut runner 75 for fastening the cap 30 to the connecting rod 8b, and a swinging mechanism 76 for swinging the nut runner 75 in the piston insertion direction, and is mounted along a guide rail 77 attached to the upper surface of the horizontal frame 16a. It is movable in the left-right direction and is driven to be transferred via a screw shaft 79 by a drive motor 78 provided at the right end of the horizontal frame 16a.

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

The cylinder block 3 carried into the piston insertion device 1 is transported to the piston insertion station 12 in an inverted position by the work loader 18, and the crank pin portion 4a of the crankshaft 4 is rotated to the dead center position by the crank indexing mechanism 32. be done. On the other hand, the imported piston assembly 8 is
The piston is held in a vertical position by the piston loader 19 and transported to the piston set station 15, and the piston supply unit 2 is moved by the cooperation of the piston set auxiliary unit 22.
The cylinder 46 is inserted and held in the piston holder 21 of 0.
is extended, and the piston holder 21 is held in an inclined state.

Next, in order to insert the piston assembly 8 into the cylinder pore 3a of the cylinder block 3, the piston pushing unit 2
3 and the piston supply unit 20 are 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, and the guide cylinder 71 is driven to move the connecting rod 8b. The bolt 28 is attached to the holding portion 7 of the guide member 70
It is held at 0b. Then, the expansion head 67 is driven to the forward position by the insertion cylinder 55, and the piston assembly 8 housed in the piston holder 21 is pushed obliquely upward along the piston insertion direction on the upper end surface of the expansion head 67. The cylinder 21b and the guide sleeve 58 are kept in contact with each other, and the piston is inserted from the piston holder 21 through the guide sleeve 58 into the cylinder bore 3a while being guided by the tapered surface 58a of the guide sleeve 58. At this time, connecting rod 8
The large end portion of b is guided by a guide member 70 and attached to the crank bin portion 4a.

Next, in order to assemble the cap 30 to the large end of the connecting rod 8b, the cap 30 placed on the butt 10 is held by the cap assembly loader 31, and the guide unit 29 is retracted to the left. The cap assembly loader 31 is driven to move above the cylinder block 3, and the cap 30
is assembled to the connecting rod 8b and temporarily tightened 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 pore 3a while being pressed by the upper end surface of the expanding head 67.

Here, the overall configuration of the control system that controls the movement positions of the piston supply unit 20 and the piston pushing unit 23 will be explained based on FIG. 7.

The piston supply unit 2o and the piston pushing unit 23 are provided in pairs at the front and rear of the guide frame 17, and since both are controlled in the same way by the control device 27, the front side will be explained.

The control device 27 includes a CI) U 80, a ROM (read only memory) 81 and a RAM (random access memory) 82 connected to the CPU 80 via a data bus, and drive circuits 83, 84, 85. It is composed of.

A first drive motor 48 that moves and drives the piston pushing unit 23 and a first brake device 49 that brakes this motor 4'8 are connected to the CPU 80 via a drive circuit 83, and a second drive motor that drives and moves the piston supply unit 2°. The drive motor 42 and the second brake device 43 that brakes the motor 42 are connected to the CPU 80 via a drive circuit 84.
The solenoid valve 64a that supplies and discharges air to the clamp cylinder 64 that connects the guide sleeve 58 to the cylinder bore 3a, the solenoid valve 55a that supplies and discharges air to and from the insertion cylinder 55 that drives the expansion unit 53 forward and backward, and the expansion head 67 are expanded. Solenoid valve 65 that supplies and discharges air to and from the driving expansion cylinder 65
a is connected to the CPU 80 via a drive circuit 85.

Furthermore, the detection signal from the rotary encoder 48a that detects the rotation angle of the first drive motor 48 and the second drive motor 4
Detection signals from the rotary encoders 42a for detecting the rotation angles of 2 are input to the CPU 80, and the CPU 80 calculates the current position of the piston pushing unit 23 and the piston based on the origin position P in FIG. 9 based on the detection signals. The current position of the supply unit 20 is constantly calculated and stored in the memory of the RAM 82.

The ROM 81 stores the distance l from the origin position P to the axial center position C of the three cylinder bores 3a of the regular 2-liter engine and 3-liter engine.

・i! , 2.l:l data and a control program for movement distance correction control, which will be described later, are stored.

The RAM 82 includes a counter that counts the number of cylinder bores 3a into which the piston assembly 8 is inserted, and a data memory that stores the moving distances (current positions) of the piston pushing unit 23 and the piston supply unit 20 from the origin position P. , various types of memories are provided to temporarily store the results of calculations performed by the CPU 80.

Next, the movement position correction side performed by the control device 27? i
The control program of 1 will be explained based on the flowchart of FIG. 8 and the operation diagram of FIG. 9. Here, we will explain the case where the piston assembly 8 is inserted into the cylinder block 3 of a 3-liter engine.
~S21 indicates each step.

When the cylinder block 3 is carried into the piston insertion station 12 and the piston assembly 8 is held in the piston holder 21, this control is started and initial settings such as clearing the soft counter n are executed (Sl). When engine size information is automatically input from limits etc., that information is also read. Next, the counter n is incremented by 11 (S2), and the axial center position C of the cylinder bore 3a into which the piston assembly 8 is inserted from the origin position iiP
Distance data 2I up to 7 is read out (S3). Next, the piston pushing unit 23 is read from the memory of the RAM 82.
The data of the current position 12 of the axis of the expansion head 67 for the 3-liter engine is read out (S4), and then! ! ,,
It is determined whether or not =p, , (35), f, =1.
, when not (Ni.

=II! , ) The piston pushing unit 23 is driven by a minute amount to measure the M step (S6), and repeating S5 and S6, ff1
When p=L, the process moves to 37. In S7, the piston pushing unit 23 is held at the axial center position C8 by driving the first brake device 49 (S7).

Next, in order to precisely align 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 inserted between the guide sleeve 58 and the cylinder bore 3a (S8 ), the drive of the first brake device 49 is released so that the piston pushing unit 23 can move along the guide rail 47 (S9'
), the spreading head 67 is driven to spread (SIO). Next, the piston pushing unit 23 moves by a minute error due to centering by expanding the expanding head 67, and the current position 22 changes, so the current position 1t of the piston pushing unit 23 is read out (Sll), and the next The movement amount Δ2 of the piston pushing unit 23 is Δi=B knee x
, ) is calculated. However, the data of l is in RAM8.
2 and use the remaining memory.

Next, the first brake device 49 is driven and the piston pushing unit 23 is positioned at the correction position T (313
), the guide sleeve 58 is coaxially connected to the cylinder bore 3a by driving the clamp cylinder 64 (S14), and the expansion drive of the expansion head 67 is released (
S15), the expanding head 67 is driven downward from the cylinder bore 3a and the guide sleeve 58 (S16).

Next, in order to move the piston supply unit 20 to the correction position T, the piston supply unit 20 is moved to the position C1, Δ2) by driving the second drive motor 42 (S17), and the second brake device 43, the piston supply unit 20 moves to the corrected position T1.
(31B).

In this way, the guide sleeve 58 and the piston holder 21
With the axis of the piston assembly 8 aligned with the axis of the cylinder bore 3a, the piston assembly 8 is pushed by the expansion head 67 while being guided by the guide member 70, passes through the guide sleeve 58, and is inserted into the cylinder bore 3a ( Sl9).

After the piston assembly 8 is inserted, the piston supply unit 20 is moved to the original position (S20), and then it is determined whether n=3 or not (321), and if n=3, S
2, S2 to S21 are repeated, and in this way the first
The second time is at the correction position F, and the second time is at the correction position T.
2 and the third time, the piston assembly 8 is inserted at the corrected position T3, and when n=3, this control ends. The description has been made on the assumption that the piston holder 21 of the piston supply device 20 can be switched between a vertical position and an inclined position at the origin position P.

As described above, the guide sleeve 5 of the piston pushing unit 23 is inserted into the cylinder bore 3a through the expanding head 67.
By correcting the movement position of the piston supply unit 1-20 by a minute movement distance Δl when centering on The axes of the holder 21 can be aligned, and the guide sleeve 5
8 and the outer peripheral edge of the cylinder bore 3a, the piston assembly 8 can be smoothly inserted into the cylinder bore 3a.

In the above embodiment, the position correction during piston insertion was performed only in one direction within the plane orthogonal to the piston insertion direction, but based on the idea of the present invention, it may be corrected in two directions within the orthogonal plane. , which is more preferable, may be handled as appropriate depending on variations in the positional accuracy of the cylinder bores 3a in the cylinder block 3.

[Brief explanation of drawings]

The drawings relate to an embodiment of the present invention, and FIG. 1 is a front view of the piston insertion device, FIG. 2 is a cross-sectional view along the line
The figures are a sectional view taken along the line III-III in Fig. 1, Fig. 4 is a longitudinal sectional side view of the piston pushing unit and piston supply unit, Fig. 5 is a longitudinal sectional view of the vicinity of the expansion head, and Fig. 6 is a plane view of the expansion head. Figure 7 is a block diagram of the control system of the piston pushing unit and piston supply unit, Figure 8 is a flowchart of the movement position correction control routine, and Figure 9 explains the movement position correction of the piston pushing unit and piston supply unit. FIG. 1... Piston insertion device, 3... Cylinder block, 3a... Cylinder bore, 8... Piston supply device, 8a... Piston, 8b... Connecting rod, 20... Piston supply unit, 23... Piston pushing unit, 24 ...first traveling mechanism, control device, -da, 5 open head. 25...Second traveling mechanism, 27...48a, 42a...Rotary encoder 8...Guide sleeve, 67...Enlarged figure 9

Claims (1)

[Claims] (1) A guide sleeve connected to a cylinder bore of a cylinder block held in a predetermined position, and an expanding head that is movable and insertable in the axial direction with respect to the cylinder bore and the guide sleeve, and that centers the guide sleeve with respect to the cylinder bore. and a piston supply unit that supplies a piston assembly including a piston and a connecting rod to the piston pushing unit, the piston pushing unit being orthogonal to the insertion direction of the expansion head. A detection means is provided to be movable in at least one direction, and detects the amount of movement of the piston pushing unit as the guide sleeve is centered with respect to the cylinder bore when the expansion head is expanded, and the amount of movement is based on the amount of movement detected by the detection means. A piston insertion device comprising a control means for controlling a movement position when the piston supply unit is moved in the one direction toward the piston pushing unit to supply the piston assembly.