JPH11129127A - Belt mounting device for engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically attach a timing belt to a pulley and to reliably engage the teeth of the timing belt with those of the pulley in an engine with a built-in belt. SOLUTION: A belt mounting device 40 for an engine comprises a belt transfer mechanism 70 to output timing belts 24 one by one from a belt stock mechanism 50 and transfer the belts to a given position; a belt deformation mechanism 80 to deform the transferred timing belt approximately in an oblong loop; a belt hook mechanism 100 hook the belt from the opening side of the cylinder block 3 to a drive pulley with the oblong timing belt grasped; an engaging mechanism 120 engaging the teeth of the drive pulley with those of the hooked timing belt through correction of the angle of a crank shaft; and an engagement detecting mechanism 110 to detect an engaging state between the teeth of the timing belt and the teeth of the drive pulley.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine belt mounting device for mounting a timing toothed belt on a toothed pulley of a crankshaft in an engine assembly process. In the present invention, the toothed pulley is referred to as “pulley”, and the timing toothed belt is referred to as “timing belt”.

[0002]

2. Description of the Related Art In general, many engines drive a camshaft or an auxiliary device with a crankshaft by a belt. Such a belt drive structure includes: (1) an external belt hooking type in which a belt is hooked on a pulley outside a crankcase;
(2) There is a belt built-in type (internal belt hanging type) in which a belt is hung on a pulley inside the crank chamber. With the external belt hanging type, although the belt hanging is easy,
Requires a belt cover. The built-in belt type does not require a belt cover, so the structure is simple, but the belt hanging is troublesome. In the engine assembling process, the operation of attaching the belt to the pulley of the crankshaft is performed manually. Since manual work is troublesome and the work efficiency is poor, we want to assemble automatically.

As a general device for automatically attaching a belt to a pulley, for example, Japanese Patent Publication No. 8-497
There is Japanese Patent Publication No. 2 "Assembling device for soft annular work". According to FIGS. 1 and 5 of the publication, the above-mentioned apparatus is a belt 101 in a state where it is elastically deformed into a substantially elliptical loop (the reference numbers are those described in the publication. The same applies hereinafter).
Is hung between two finger pins 36 and 44, and these finger pins 36 and 44 are lowered according to the axis of the pulley gear 102 and the axis of the idler 103. The present invention is applied to belt assembling of a typewriter and a printer.
According to FIGS. 3 and 5 of the publication, the rods 50, 5 with the belt 101 clamped are also shown.
1 in the direction of arrow A, the belt 101 is rotated.
To rotate the teeth of the belt 101 to pulley gears 102
It is designed to mesh with the teeth.

[0004]

The above-mentioned prior art can be applied to the process of assembling the engine with the external belt, but cannot be applied to the process of assembling the engine with the built-in belt. . This is because in an engine with a built-in belt, the belt is inserted into the narrow space from the opening side of the cylinder block and attached. In addition, the teeth of the belt must be securely engaged with the teeth of the pulley. If the meshing of the teeth is incomplete, correction work is required in the next step.

Accordingly, an object of the present invention is to enable a timing belt to be automatically attached to a pulley even in an engine with a built-in belt, so that the teeth of the timing belt can be reliably engaged with the teeth of the pulley. It is to provide a device.

[0006]

According to a first aspect of the present invention, a crankshaft having a pulley is assembled into a cylinder block so that the pulley is housed in a crank chamber. A belt transfer mechanism for taking out the timing belts one by one from a belt stock mechanism and transferring them to a predetermined position; and A belt deformation mechanism that deforms into an approximately elliptical loop, a belt hooking mechanism that grips the oval timing belt and hangs on the pulley from the opening side of the cylinder block, and cranks the pulley teeth on the hooked timing belt teeth A tooth matching mechanism that adjusts by adjusting the shaft angle, and the timing belt teeth and Characterized by being constituted by a mesh detection mechanism for detecting the engagement state between the re tooth.

The belt mounting device for an engine takes out timing belts stored in a belt stock mechanism one by one by a belt transport mechanism and transports them to a predetermined position, and the transported timing belts are generally oval by a belt deformation mechanism. The belt is deformed into a loop, and the elliptical timing belt is automatically attached to the pulley in a narrow space from the opening side of the cylinder block while being gripped by the belt hooking mechanism. After that, the tooth matching mechanism adjusts the angle of the crankshaft to thereby align the teeth of the pulley with the teeth of the timing belt. Further, the meshing detection mechanism quickly and surely detects the meshing state between the teeth of the timing belt and the teeth of the pulley.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals. FIG. 1 is a sectional view of an engine according to the present invention. The engine 1 is a single-cylinder general-purpose engine employing an OHC (overhead cam) system, and includes a crankcase 2, a cylinder block 3, a head cover 4, a crankshaft 5, a connecting rod 6, a piston 7,
The valve mechanism 8 and the spark plug 9 are main components.

The crankcase 2 and the cylinder block 3 intersect with a crankshaft 5 extending left and right in the figure.
It is configured to be divided by an oblique dividing surface (flange mating surface) M and the flanges are bolted together. That is, the division plane M
Is an oblique surface crossing the direction in which the crankshaft 5 extends. Therefore, one end of the crankshaft 5 is supported by the bearing 11 of the crankcase 2, and the other end of the crankshaft 5 is supported by the bearing 12 of the cylinder block 3. Therefore, by changing the direction of the cylinder block 3 with respect to the crankcase 2, the engine 1 can be changed between a vertical type shown in the figure and a horizontal type not shown.

A chamber 13 formed by the crankcase 2 and the cylinder block 3 is a crank chamber. The cylinder block 3 has a shape in which the cylinder head side (upper side in the figure) is closed, and the piston 7 is fitted to the cylinder 14 at the back.

The valve operating mechanism 8 is a mechanism that opens and closes an illustrated intake valve 15 and an unillustrated exhaust valve (hereinafter referred to as “intake / exhaust valve 15”) in synchronization with the rotation of the crankshaft 5. . Specifically, the valve mechanism 8 includes a drive pulley (toothed pulley) 21 attached to the crankshaft 5,
A driven pulley (toothed pulley) 23 attached to the camshaft 22, and a timing belt (timing toothed belt) hung between the driving pulley 21 and the driven pulley 23
24, a cam 25 formed integrally with the driven pulley 23,
Rocker arm 26 that swings guided by the peripheral surface of cam 25
Consists of The rocker arm 26 slides the valve body 15a of the intake / exhaust valve 15 via a retainer 26a. 27 is a rocker arm shaft, 28 is an adjustment screw, 2
9 is a spring.

Incidentally, the valve operating mechanism 8 includes a crank chamber 13.
Inside the drive pulley 21 and the timing belt 24
This is a mechanism with a built-in belt (internal belt hanging type). For this reason, the drive pulley 21 is located between the bearing 11 of the crankcase 2 and the division surface M so as to be accommodated in the crankcase 13. The cylinder block 3 is formed with a belt insertion hole 31 through which the timing belt 24 hung between the driving and driven pulleys 21 and 23 passes. The belt insertion hole 31 is a hole that passes through the inside and outside of the crankcase 13 along the cylinder 14, and this hole passes through the crankcase 2 near the bearing 11.

The camshaft 22 is connected to the cylinder block 3.
The driven pulley 23 has its upper half generally exposed from the upper end of the cylinder block 3. The valve mechanism 8 including the exposed driven pulley 23 is covered with the head cover 4 detachably attached to the upper end of the cylinder block 3 and is not exposed to the outside.
In the figure, 5a is an upper balance weight, 5b is a lower balance weight, 32 is an oil slinger, 33 and 34 are oil seals, and 35 is a cooling fan.

FIG. 2 is a sectional view of the cylinder block according to the present invention, and shows a state where the cylinder block 3 incorporating the crankshaft 5 is set horizontally on the pallet Pa. More specifically, the cylinder block 3 is placed in a horizontal state by setting a plurality of legs 36 integrally formed on the outer surface of the cylinder block 3 on the pallet Pa. For this reason, the cylinder axis L is horizontal, the division surface M is obliquely upward, and the crankshaft 5
Is vertical, and the drive pulley 21 attached to the crankshaft 5 is exposed upward from the division surface M. The cylinder block 3 is in a state where the head cover 4 is removed, and the valve train 8 is provided with only the driving pulley 21.

In this state, to hang (attach) the timing belt 24 to the drive pulley 21, (1) first pass the loop of the timing belt 24 through the crankshaft 5, and (2) move the timing belt 24 horizontally. Then, while being inserted into the belt insertion hole 31 from the opening side (the division surface M side), the belt is hung on the drive pulley 21.

FIG. 3 is a front view of the engine belt mounting device according to the present invention. Engine belt attachment device 40
The timing belt 24 is attached to the drive pulley 21 with the cylinder block 3 set horizontally as shown in FIG.
Is a device that automatically hangs. More specifically, the engine belt attachment device 40 includes a block conveyor 41, a belt stock mechanism 50, a belt lifter mechanism described later,
The belt transfer mechanism 70, the belt deformation mechanism 80, the block holding mechanism 90, the belt hooking mechanism 100, the mesh detection mechanism 110, the meshing mechanism 120, and the horizontal moving mechanism 1
30.

The block conveyor 41 has a pallet Pa
Is a conveyor for sequentially transporting the cylinder blocks 3 set horizontally to the predetermined belt insertion position. The belt stock mechanism 50 is a mechanism that stocks the timing belts 24. The belt transfer mechanism 70 is a mechanism that takes out the timing belts 24 one by one from the belt stock mechanism 50 and transfers them to the belt deformation mechanism 80 at a predetermined position.

The belt deformation mechanism 80 includes the belt transfer mechanism 7
This is a mechanism for deforming the timing belt 24 conveyed at 0 into a substantially oval loop. The block suppressing mechanism 90
Cylinder block 3 set horizontally on pallet Pa
Is a mechanism for suppressing movement from a predetermined position. The belt hanging mechanism 100 includes an oval timing belt 24.
Is a mechanism that is held on the drive pulley 21 from the opening side of the cylinder block 3 while gripping.

The meshing detection mechanism 110 includes a drive pulley 21
This is a mechanism for detecting the state of engagement between the teeth of the timing belt 24 and the teeth of the timing belt 24. The tooth matching mechanism 120 is a mechanism that adjusts the teeth of the drive pulley 21 to the teeth of the timing belt 24 that are hung by correcting the angle of the crankshaft 5.

The horizontal moving mechanism 130 includes the belt moving mechanism 7
0, the block holding mechanism 90 and the belt hanging mechanism 100 are horizontally moved by the same movement distance S in the same direction at the same timing. Specifically, the horizontal moving mechanism 13
Reference numeral 0 denotes a horizontal frame 132 attached to the upper part of the post 131 and extending left and right, a first air cylinder 133 mounted on the back of the horizontal frame 132, and a vertical plate driven by the first air cylinder 133 to move horizontally left and right. And a horizontal slide plate 134 in a shape of a circle. First air cylinder 133
Consists of, for example, a rodless cylinder.

The horizontal slide board 134 has a belt transfer mechanism 70, a block holding mechanism 90, and a belt hooking mechanism 100 mounted on the surface in this order from the right.
By the horizontal slide plate 134 by horizontally moving the moving distance S, between the belt transfer mechanism 70 is horizontally moved between the position O ₁ and the belt deformation mechanisms 80, block suppressing mechanism 90 is located O ₁₁ and the position O ₁₂ , And the belt hanging mechanism 100 moves horizontally between the position O ₂₁ and the position O ₂₂ . 135 and 135 are guide rails for a horizontal slide board.

FIG. 4 is a plan view of an engine belt mounting device according to the present invention. The block conveyor 41 conveys the cylinder block 3 set on the pallet Pa in the direction of the white arrow and temporarily stops at the belt insertion position Ip. Belt stock mechanism 50
Consists of a turntable 52 intermittently rotated by a servomotor 51 (see FIG. 3), and six cylindrical magazines 53 detachably set on the turntable 52. Belt transfer mechanism 70, belt deformation mechanism 80, block holding mechanism 90, belt hooking mechanism 100, meshing detection mechanism 110
The toothing mechanism 120 is disposed substantially on a horizontal line, and the intersection of the line and the block conveyor 41 is the belt insertion position Ip.

FIG. 5 is a right side view of the engine belt mounting device according to the present invention. Each vertical magazine 53 ...
A number of timing belts 24 are held in a stacked state on the outer peripheral surface. The belt stock mechanism 50 is stopped so that one of the magazines 53 comes almost immediately below the belt transfer mechanism 70. When the timing belt 24 is taken out from the magazine 53 and becomes empty, the belt stock mechanism 50 is rotated by one pitch to be adjacent to the belt 53. The magazine 53 is operated so as to be positioned almost directly below the belt transfer mechanism 70. The belt lifter mechanism 60
This is a mechanism for forcibly lifting a large number of timing belts 24 stocked in a vertically stacked magazine 53 in a stacked state, one pitch at a time, and is arranged almost directly below the belt transfer mechanism 70.

FIGS. 6A and 6B are diagrams showing the construction of the belt lifter mechanism according to the present invention. The belt lifter mechanism 60
Vertical ball screw 6 rotatably mounted on stand 61
2 and a servo motor 63 for rotating the ball screw 62
, A lift base 64 combined with the ball screw 62 so as to be movable only in the axial direction, a lift arm 65 attached to the lift base 64 so as to be able to advance and retreat, and a sleeve 66 that is moved up and down by the lift arm 65. Incidentally, the magazine 53 has two notches 53a, 53a facing the upper end. 6
6, 66 are guide rails for the base of the lift.

FIG. 7 is a front view of the belt transfer mechanism according to the present invention. The belt transfer mechanism 70 includes the horizontal slide plate 13
4, a vertical plate-shaped base 71 mounted on the surface of the base 4, a second air cylinder 72 mounted downward on the base 71, a vertical moving body 73 driven up and down by the second air cylinder 72,
A pair of left and right hanging members 74, 74 suspended vertically from the up and down moving body 73, compression springs 75, 75 for resilient the left and right hanging members 74, 74 downward, and left and right hanging members 74, 7.
Hand air chucks 76, 76 attached to the lower part of
A pair of hands 77 attached to the hand air chucks 76, 76, and the hand air chuck 7
6 and 76, and abutment members 78, 78 attached to the center of the lower end.

The contact member 78 is a member for checking the level of the uppermost timing belt 24 by hitting the upper surface of the uppermost timing belt 24 stocked in the magazine 53 in a stacked state. When the contact member 78 descends and hits the uppermost timing belt 24, the hanging members 74, 74
Lifts upward to absorb the lowering driving force of the second air cylinder 72. Since the level of the uppermost timing belt 24 is checked each time the contact member 78 descends, even if there is a dimensional error in the width of the timing belt 24, an accurate level can be easily checked. Moreover, the configuration is simple.

The hand air chuck 76 drives the pair of hands 77, 77 to open and close left and right. The pair of hands 77, 77 is for picking up the timing belt 24 one by one from above the magazine 53 and taking it out. The left and right two pairs of hands 77, 77 have two notches 53a,
The timing belt 24 is pinched at the position 53a. 79, 79 are guide rails for the vertical moving body.

FIGS. 8A to 8D are operation diagrams of the belt transfer mechanism according to the present invention. The following procedures (a) to (d) are used to take out the timing belts 24 stocked in a stacked state one by one by the belt transfer mechanism 70.
In (a), the hands 77, 77 and the contact member 78 are lowered. In (b), when the contact member 78 hits the upper surface of the uppermost timing belt 24, the hands 77,
77 and the contact member 78 stop the descending operation. And
The hands 77, 77 pick up the uppermost timing belt 24. In (c), the hands 77, 77 and the contact member 7
8 rises. As a result, as shown in FIG.
At 77, the timing belts 24 can be picked and removed one by one.

FIG. 9 is a perspective view of a belt deformation mechanism according to the present invention. The belt deforming mechanism 80 includes a table 81 on which the transferred timing belt 24 is placed, a third air cylinder 82 mounted laterally on the lower surface of the table 81, and a third
A slider 83 driven by an air cylinder 82 to move horizontally along the lower surface of the table 81, a belt extending member 84 connected to the slider 83 via a notch 81a of the table 81 and sliding on the upper surface of the table 81;
A belt hanging member 85 fixed to the upper surface of
1 includes a belt detection sensor 86 for detecting the presence of the timing belt 24.

The belt expanding member 84 and the belt hanging member 8
Reference numeral 5 denotes a substantially semi-circular plate in a plan view having arcs in mutually opposite directions. The radius of the arc of these semi-circles is a dimension that causes the timing belt 24 to deform into a predetermined oval loop. The belt detection sensor 86 is composed of, for example, a combination of a light projector 86a and a light receiver 86b. 87 is a compression spring which resiliently extends the belt expanding member 84 in the extending direction.

FIGS. 10A and 10B are operation diagrams of the belt deformation mechanism according to the present invention. In (a), when the timing belt 24 indicated by the imaginary line is placed on the table 81,
The belt detection sensor 86 detects that the timing belt 24 is present. Based on the detection signal of the belt detection sensor 86, the belt expanding member 84 slides in the belt expanding direction. As a result of the sliding of the belt expanding member 84, the timing belt 24 is deformed into a predetermined oval loop as shown in FIG.

FIG. 11 is a perspective view of the block holding mechanism and the belt hanging mechanism according to the present invention. Block holding mechanism 9
Reference numeral 0 denotes a fourth air cylinder 91 attached downward to the horizontal slide board 134, a restraining member 92 that is driven by the fourth air cylinder 91 to move up and down, and a compression spring 93 that resiliently pushes the restraining member 92 downward. .

The belt hooking mechanism 100 is a first mechanism 100A for moving the entire mechanism up, down, left, and right (in the XY axis direction).
And the second mechanism 100B of the belt hanging portion. The first mechanism 100A includes a fifth air cylinder 101 mounted laterally on a horizontal slide board 134, and a fifth air cylinder 1
Left and right moving body 102 driven horizontally by 01 and horizontally moving left and right
And a sixth air cylinder 103 attached downward to the left and right moving body 102, and an up and down moving body 104 driven by the sixth air cylinder 103 to move up and down.

FIG. 12 is a side view of the belt hanging mechanism according to the present invention. Second mechanism 100B of belt hanging mechanism 100
A seventh air cylinder 105 mounted downward on the vertical moving body 104, an air chuck 106 driven up and down by the seventh air cylinder 105, and an air chuck 106
A pair of inner hands 10 before and after (left and right in this figure) attached to
7, 107; a pair of eighth air cylinders 108, 108 inwardly mounted on the front plate 104a and the rear plate 104b (left and right plates in this figure) of the vertical moving body 104; An outer hand 109, 109 is driven by the cylinders 108, 108 and comes into contact with and separates from the inner hand 107, 107. The air chuck 106 is a pair of the inner hands 10.
7, 107 are driven back and forth. 102a is a guide rail for the vertical moving body, and 134a is a guide rail for the left and right moving body.

Returning to FIG. 11, once, the air chuck 106 is attached to one end of the inner hand 107, 107, and the eighth air cylinder 108, 108 is
9, 109 are attached at one end. Outside hand 10
9 is longer than the inner hand 107 and the outer hand 10
9 has a belt receiving portion 109a at the other end. Outside hand 1
The reason why 09 is long is that the outer hand 109 supporting the timing belt 24 in FIG. 2 is inserted into the belt insertion hole 31. On the other hand, the inner hand 107 is not inserted into the belt insertion hole 31.

FIG. 13 is a plan sectional view of a hand of the belt hanging mechanism according to the present invention, in which an oval timing belt 24 indicated by an imaginary line is attached to the inner hand 10 facing each other.
7 and 107 and the outer hands 109 and 109 indicate that they are sandwiched.

FIG. 14 is a sectional view taken along the line 14-14 in FIG. 13. The pair of belt receiving portions 109a, 109a extend in the directions facing each other, and the timing belt 24 shown in imaginary lines.
This is the member that receives.

FIG. 15 is a front view of the meshing detection mechanism and the meshing mechanism according to the present invention. The engagement detection mechanism 110
A ninth air cylinder 112 mounted horizontally on the upper table 111, a first slider 113 driven by the ninth air cylinder 112 to move horizontally left and right, and a first slider 113 mounted on the first slider 113 so as to be able to move left and right. 2 slider 11
4, a rotatable detection roller 115 attached to the tip of the second slider 114, a compression spring 116 for resiliently moving the second slider 114 in the forward direction, and the second slider 114 retreating with respect to the first slider 113. Detection sensor 11 that detects poor meshing of teeth by detecting
7 Reference numeral 118 denotes a first slider guide rail.

The aligning mechanism 120 includes an upper table 111
A first stage mechanism 120A for horizontally moving the entire mechanism left and right,
And a second-stage mechanism 120B of the meshing portion.

FIG. 16 is a sectional view taken along line 16-16 of FIG. The first stage mechanism 120A includes a tenth air cylinder 122 mounted laterally on the lower table 121, and a tenth air cylinder 122.
The main movable body 123 is driven by the air cylinder 122 and horizontally moves left and right.

Referring back to FIG. 15, the second stage mechanism 120B includes an eleventh air cylinder 124 mounted laterally on the main movable body 123, and an eleventh air cylinder 124.
Movable body 125, which is driven horizontally and moves horizontally from side to side, and a twelfth air cylinder 1 attached to the sub movable body 125 downward.
26, a flat plate-shaped arm 127 driven up and down by the twelfth air cylinder 126, and two rotatable push rollers (first push roller 128 and second push roller 129) attached to the tip of the arm 127. Consists of

First push roller 128 and second push roller 1
29 and at the same level, and the second pressing roller 1
29 is the crankshaft 5 more than the first push roller 128
It is in a close position (a position protruding in the forward direction). FIG.
As shown in (1), the first push roller 128 and the second push roller 129 are located at a distance from each other by a predetermined distance. The first push roller 128 is hooked on _one back surface 5a ₁ of the upper balance weight 5a, and
Plays the role of rotating clockwise R in the figure. The second pressing roller 129, by striking the other of the back 5a ₂ in balance weight 5a above, serves to determine the rotation angle of the crankshaft 5. Therefore, the angle of the crankshaft 5 can be corrected by the first and second push rollers 128 and 129. 121a is a main movable body guide rail, and 123a is a sub movable body guide rail.

FIGS. 17A to 17D are operation diagrams of the belt hooking mechanism and the meshing detection mechanism according to the present invention. (A)
, The inner and outer hands 10 of the belt hanging mechanism 100
7 and 109 move toward the drive pulley 21 while gripping the oval timing belt 24. As shown in (b),
The detection roller 115 moves toward the drive pulley 21 with the timing belt 24 hanging on the drive pulley 21.

When the teeth of the driving pulley 21 and the teeth of the timing belt 24 are completely engaged as shown in FIG.
The distance to the back of 4 is A _1. In this state, when the detection roller 115 hits the timing belt 24, the second slider 114 does not retreat with respect to the first slider 113, so that the detection sensor 117 does not detect a poor meshing of the teeth.

On the other hand, if the engagement between the teeth of the drive pulley 21 and the teeth of the timing belt 24 is incomplete, as shown in (d), the distance from the center of the drive pulley 21 to the back of the timing belt 24 is reduced. Is A ₂ and the above (c)
Greater than the distance A ₁ of. In this state, when the detection roller 115 hits the timing belt 24, the second slider 114 retreats with respect to the first slider 113.
The detection sensor 117 detects a poor meshing of the teeth.

Next, the operation of the engagement mechanism 120 will be described with reference to FIGS. 1 and FIG.
The code of 9 is the same. FIG. 18 is an operation diagram (part 1) of the tooth matching mechanism according to the present invention, and shows the movement trajectories of the first and second push rollers 128 and 129. First push roller 12
8 from the reference position P ₁₀ shown by the solid line, the two upper and lower balance weights 5a, after advancing to the first position P ₁₁ passes between 5b (arrow), the second on the back of the balance weight 5a above It was raised to a position P ₁₂ (arrow), then
Retracted to a predetermined third position P ₁₃ (arrow), then lowered to the fourth position P ₁₄ of the original level (arrow), and finally retracted to the original reference position P ₁₀ (arrow) in the movement locus Operate.

The movement of the arrow is performed by the forward movement of the tenth and eleventh air cylinders 122 and 124 in FIG. 15, and the movement of the arrow is performed by the twelfth air cylinder 12 in FIG.
6, the movement of the arrow is executed by the backward operation of the eleventh air cylinder 124, and the movement of the arrow is executed by the downward operation of the twelfth air cylinder 126.
The movement of the arrow is executed by the reverse operation of the tenth air cylinder 122.

The second pressing roller 129 also has a reference position P ₂₀ → first position P ₂₁ → second position similarly to the first pressing roller 128.
Position P ₂₂ → third position P ₂₃ → fourth position P ₂₄ → reference position P ₂₀
It operates on the locus of movement.

FIGS. 19 (a) to 19 (d) are operation diagrams (part 2) of the tooth matching mechanism according to the present invention, showing the operation of the tooth matching mechanism 120 and the meshing of the driving pulleys / timing belts 21 and 24. Show the relationship. (A) is a state where the teeth of the driving pulley 21 and the teeth of the timing belt 24 are incompletely engaged. The first and second push rollers 128, 129
Move from the reference positions P ₁₀ and P ₂₀ to the first positions P ₁₁ and P ₂₁ (arrows).

Next, as shown in (b), the first and second push rollers 128 and 129 move up to the second positions P ₁₂ and P ₂₂ which are the back levels of the upper balance weight 5a, and then retreat ( Arrow). At this time, since the first push roller 128 pushes _one back surface 5a1 of the balance weight 5a,
The balance weight 5a rotates clockwise R in the figure. Therefore, the crankshaft 5 and the drive pulley 21 also rotate clockwise R in the figure, so that the teeth of the drive pulley 21 mesh with the teeth of the timing belt 24.

[0051] When the balance weight 5a is rotated by a predetermined angle, the back 5a ₂ of the balance weight 5a other as (c) since striking the second pressing roller 129, the rotation is restricted. At this time, the first and second push rollers 128,
The positions 129 are the third positions P ₁₃ and P ₂₃ .

Next, as shown in (d), the first and second push rollers 128 and 129 are separated by two upper and lower balance weights 5.
After descending to the fourth positions P ₁₄ and P ₂₄ between the points a and 5b,
Reference position P _10, retreats to P ₂₀ (arrow). As described above, the first and second push rollers 128 and 129 are (a) to
By performing the operation (d), the teeth of the drive pulley 21 and the teeth of the timing belt 24 can be engaged.

Next, the overall operation of the engine belt attachment device 40 will be described with reference to FIGS. FIG.
(A)-(e) is the 1st operation figure of the whole belt attachment device for engines concerning the present invention. First, FIG.
, The timing belts 24 are taken out one by one from the magazine 53 by the hands 77, 77 of the belt transfer mechanism 70. Next, in FIG. 20B, the removed timing belt 24 is transferred to the belt deformation mechanism 80.

In FIG. 20C, the belt transfer mechanism 7
The zero hands 77, 77 return to their original positions, and the inner and outer hands 107, 109 of the belt hooking mechanism 100 move to the position of the belt deformation mechanism 80. 20D, after the timing belt 24 is deformed into a substantially elliptical loop by the belt deformation mechanism 80, the inner / outer hands 107,
Reference numeral 109 grips the oval timing belt 24. In FIG. 20E, the timing belt 24 gripped by the inner / outer hands 107 and 109 is transferred. Next, FIG.
Proceed to (a).

FIGS. 21 (a) to 21 (d) are general operation diagrams (part 2) of the engine belt mounting device according to the present invention.
In FIG. 21A, the cylinder block 3 set on the pallet Pa in the horizontal position is at a predetermined belt insertion position. In this state, the holding member 92 of the block holding mechanism 90 and the inner and outer hands 10 of the belt hooking mechanism 100
7, 109 move to a position above the cylinder block 3. Then, the holding member 92 holds the cylinder block 3 to prevent the displacement.

Next, the inner and outer hands 107 and 109 pass the gripped timing belt 24 from the upper end of the crankshaft 5 to the level of the driving pulley 21 and then move it horizontally. Therefore, the timing belt 24 is inserted into the belt insertion hole 31 from the opening side of the cylinder block 3 and is hung on the drive pulley 21.

At this time, as shown in FIG. 21B, the base ends of the inner hand 107 and the outer hand 109 are connected to the belt insertion holes 3.
It is in the position where it stopped just before 1. From this state, the detection roller 115 moves forward and hits the back surface of the timing belt 24, and detects the meshing state of the teeth. Thereafter, the first and second push rollers 128 and 129 of the gearing mechanism 120 move back and forth and up and down, so that the crankshaft 5 rotates by a predetermined angle. As described above, by correcting the angle of the crankshaft 5, the teeth of the drive pulley 21 mesh with the teeth of the timing belt 24.

Next, in FIG.
07 rises. This is because, if the inner hand 107 retreats in the horizontal direction without ascending, the inner hand 107 hits the driving pulley 21. Next, in FIG. 21 (d), the outer hand 109 retreats in the horizontal direction, moves out of the belt insertion hole 31, and then moves up. The detection roller 115 moves backward after confirming that the meshing state of the teeth is proper. Finally, the block conveyor 41 in FIG. 3 conveys the cylinder block 3 to the next step. Thus, one cycle of the engine belt automatic attachment process is completed.

In the above embodiment, the engine 1 is not limited to a single-cylinder general-purpose engine.
For example, a multi-cylinder engine may be used. Engine 1
In addition to the configuration in which the cylinder head side of the cylinder block 3 is closed, an open configuration may be used.
The open end is closed by the cylinder head and the head cover 4. The division surface M between the crankcase 2 and the cylinder block 3 is not limited to an oblique division surface, and may be, for example, a division surface on the axis of the crankshaft 5 and parallel to this axis. Each air cylinder 72, 82, 91, 101, 10
3,105,108,112,122,124,12
6, 133 may be replaced with another drive source, for example, a hydraulic cylinder or a motor. Air chuck 7
6 and 106 may be driven by, for example, a hydraulic cylinder or a motor instead of the air drive.

[0060]

According to the present invention, the following effects are exhibited by the above configuration. The invention according to claim 1 is configured such that the timing belt deformed into a substantially elliptical loop is hung on the pulley from the opening side of the cylinder block. The timing belt can be installed automatically and easily.

Also, by correcting the angle of the crankshaft, the teeth of the pulley are aligned with the teeth of the timing belt, so that the teeth can be automatically and reliably inserted in a narrow space such as an engine with a built-in belt. Can be engaged. Moreover, the meshing state between the teeth of the timing belt and the teeth of the pulley can be quickly and reliably detected by the meshing detection mechanism. For this reason, the engine with incomplete meshing of the teeth is not transferred to the next process, so that there is no need to correct the meshing in the next process, and the workability is improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of an engine according to the present invention.

FIG. 2 is a sectional view of a cylinder block according to the present invention.

FIG. 3 is a front view of the engine belt mounting device according to the present invention.

FIG. 4 is a plan view of the engine belt mounting device according to the present invention.

FIG. 5 is a right side view of the engine belt mounting device according to the present invention.

FIG. 6 is a configuration diagram of a belt lifter mechanism according to the present invention.

FIG. 7 is a front view of the belt transfer mechanism according to the present invention.

FIG. 8 is an operation diagram of the belt transfer mechanism according to the present invention.

FIG. 9 is a perspective view of a belt deformation mechanism according to the present invention.

FIG. 10 is an operation diagram of a belt deformation mechanism according to the present invention.

FIG. 11 is a perspective view of a block holding mechanism and a belt hanging mechanism according to the present invention.

FIG. 12 is a side view of the belt hanging mechanism according to the present invention.

FIG. 13 is a cross-sectional plan view of a hand of the belt hanging mechanism according to the present invention.

14 is a sectional view taken along line 14-14 in FIG.

FIG. 15 is a front view of the meshing detection mechanism and the meshing mechanism according to the present invention.

16 is a sectional view taken along line 16-16 of FIG.

FIG. 17 is an operation diagram of a belt hanging mechanism and a meshing detection mechanism according to the present invention.

FIG. 18 is an operation diagram (1) of the engagement mechanism according to the present invention.

FIG. 19 is an operation diagram of the engagement mechanism according to the present invention (part 2).

FIG. 20 is an overall operation diagram (part 1) of the engine belt mounting device according to the present invention;

FIG. 21 is an overall operation view of the engine belt mounting device according to the present invention (part 2).

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Engine, 2 ... Crankcase, 3 ... Cylinder block, 5 ... Crankshaft, 5a ... Upper balance weight, 5b ... Lower balance weight, 8 ... Valve operating mechanism, 1
DESCRIPTION OF SYMBOLS 3 ... Crank chamber, 21, 23 ... Pulley (drive pulley and driven pulley as a toothed pulley), 24 ... Timing belt (Timing toothed belt), 40 ... Engine belt mounting device, 50 ... Belt stock mechanism, 70 ... Belt transfer mechanism, 80: belt deformation mechanism, 100: belt hooking mechanism, 110: meshing detection mechanism, 120: meshing mechanism, 130: horizontal movement mechanism.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Teruo Yoshioka 1-10-1, Shinsayama, Sayama City, Saitama Prefecture Honda Engineering Co., Ltd.

Claims (1)

[Claims] 1. An engine belt mounting device for mounting a timing belt on a pulley after assembling a crankshaft with a pulley into a cylinder block so that the pulley is housed in a crankcase. The apparatus includes a belt transfer mechanism that takes out timing belts one by one from a belt stock mechanism and transfers them to a predetermined position, a belt deformation mechanism that deforms the transferred timing belts into a substantially oval loop, and an oval timing belt. A belt hooking mechanism for hooking the pulley from the opening side of the cylinder block while gripping, a tooth matching mechanism for aligning the pulley teeth with the hooked timing belt teeth by correcting the angle of the crankshaft, and the timing belt teeth And a meshing detection mechanism that detects the meshing state between the gears and the pulley teeth. A belt attachment device for an engine, comprising: