JPS61284329A - Elastic membrane spreading device - Google Patents

Abstract

PURPOSE:To make it possible to automate the spreading operation of a boot end and shorten the process time by impregnating the specified amount of liquid into the interior of an elastic membrane from a nozzle inserted into an impregnable opening. CONSTITUTION:Jaw sections 92 and 93 are brought into contact with the points 90 and 91 spacing by a specified degree in sircumferential direction on the end 10b of the boot 10 attached to the periphery of a shaft 1. The jaw sections 92 and 93 are formed on the end of arms 94 and 95, which are connected to the rotary shafts 98 and 99 held at liberty of rotation respectively by the bearing sections 96 and 97 arranged on a second base 57. The rotary shafts 98 and 99 are connected to the levers 102 and 103 driven respectively by cylinders 100 and 101 provided on the second base 57. The nozzle 81 of a grease impregnation device 82 is inserted into the impregnable opening 10c of the boot 10, and the nozzle 81 is held with a nozzle holder 83.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention provides a method for automatically injecting a predetermined amount of liquid into an elastic membrane attached to the outer periphery of a shaft. Concerning an expanding device.

(Prior Art) A power transmission mechanism is essential for transmitting the rotational force of an engine as a prime mover to drive wheels, such as in an automobile, to drive the automobile as a driven object.

This mechanism is [Automotive Engineering Complete Book Volume 9, Power Transmission Device,
Edited by: Automotive Engineering Complete Book Editorial Committee, published by Kaizando Co., Ltd.

FIG. 7 is a sectional view of a main part of an automobile drive shaft in which a constant velocity joint is assembled to the shaft as a power transmission mechanism.

In this drive shaft, a tri-board type constant velocity joint 2 is attached to the left side of the shaft 1 in the figure, and a bell type constant velocity joint 3 is attached to the right side in the figure. These constant velocity joints 2.degree. 3 are essential for front wheel drive so-called FF vehicles, and have the function of maintaining a constant rotational speed transmitted from the shaft to the joint even when the front wheels are steered.

In this case, the tri-board type constant velocity joint 2 is on the final drive side (wheel side), and is an inner race in which a john 5 is cut into a female serration corresponding to a male serration 4 formed on the shaft 1. 6, 4, a spider 7 protruding from the outer periphery of the inner race 6 in the circumferential direction 3, a spherical roller 8 rotatably held on the outer periphery of the spider 7, and a spherical roller 8 which is rotatably held on the outer periphery of the spider 7; It has a housing 9 that is movably housed, and a boot 10 made of a rubber material or the like to keep the inside waterproof and dustproof. and,
To prevent the shaft 1 from being handled from the inner race 6, a circlip 11 for preventing handling is attached to the shaft.

Further, a final drive side shaft 12 is connected to the housing 9.

In such a tri-board type constant velocity joint 2, the inner race 6 and the spherical roller 8 attached to the end of the shaft 1 slide against the inner circumferential wall of the housing, so that the shaft 1 is aligned with the axis of the final drive shaft 12. It is designed to allow rotational force to be transmitted at a constant speed despite this.

In addition, the bell-shaped constant velocity joint 3 is on the wheel side (drive side) in this case, and includes an inner race 13 in which female serrations 5 corresponding to the male serrations 4 formed on the shaft 1 are cut. A steel ball 15 rotatably held in a ball cage 14 on the outer periphery of the inner race 13, a housing 16 in which the steel ball 15 is inscribed, and a boot 17 made of a rubber material or the like to keep the interior waterproof and dustproof. and has. In addition, in the case of this constant velocity joint 3 as well, there is a circlip 1 in the center for stopping so that the shaft 1 cannot be handled from the inner race 13.
1 is attached to the shaft.

The housing 16 also includes a wheel side shaft 18.
is connected. In such a bell-shaped constant velocity joint 3, the inner race 13 attached to the end of the shaft 1
and a steel ball 15 held in a ball cage 14
slidingly contacts the inner circumferential wall of the housing 16, allowing the shaft 1 to tilt relative to the axis of the wheel-side shaft 18, and transmitting rotational force at a constant speed despite this. There is.

In the case of this drive shaft, the spider 7 attached to the end of the shaft 1 slides on the inner peripheral surface of the housing 9 in the axial direction within the tri-port type constant velocity joint 2 on the final drive side, and heats up. This is intended to absorb axial movement of the shaft 1 due to strain or other causes. Furthermore, regardless of the axial movement of the shaft 1, the rotational force of the shaft 1 is effectively transmitted to the final drive side shaft 12 via the housing 9.

Each joint 2, 3 has one shaft 1 and one shaft 12 .
Each sliding contact portion (inner race 6.
13, spider 7, spherical roller 8, steel ball 1
5 etc.). Since it is necessary that the sliding contact portions slide smoothly, it is necessary to inject a predetermined amount of grease into the housings 9 and 16.

The operation of injecting this predetermined amount of grease into each housing 8, 16 has conventionally been carried out as follows.

As shown in FIG. 8, a tri-board type constant velocity joint 2 and a bell type constant velocity joint 3 are attached to both ends of the shaft 1, and this shaft component is mounted on a support stand fixed on a base 20. 21. Place on 22.

Housing 9 in tri-board type constant velocity joint 2
is movable in the axial direction relative to the inner race 6 and spider 7 attached to the end of the shaft 1.

Therefore, the axial boot length La of the boot 10 whose one end 10a is crimped to the outer periphery of the housing 9 and whose other end 10b is crimped to the boot mounting groove 1a formed at a predetermined axial position of the shaft 1 is also 9 relative to the shaft 1 in the axial direction. If the length of the boot 19a is too short than in the normal operating state, the end 10b of the boot 19a can be manually expanded (indicated by the two-dot chain line in the figure), and the grease in the grease can 23 can be removed from there. Alternatively, if grease pumped by a pump (not shown) is manually injected into the boot 10, that is, the inside of the housing 9, the internal volume of the boot 10 is smaller than in a normal state, so the internal volume is There was a risk that the inside would be overflowing with grease and the necessary predetermined amount of grease could not be filled inside.

Further, if the length of the boot is longer than in the normal operating state, the end portion 10b of the boot 10 is manually expanded,
When the grease in the grease can 23 or the grease pumped by a pump (not shown) is manually injected into the boot 10, that is, the housing 9, the boot 1
Since the internal volume of 0 is larger than the normal state, it is possible to fill the interior with a necessary predetermined amount of grease. However, after injecting the grease, when the end 10b of the boot 10 is crimped into the groove in the shaft 1 and installed on the vehicle body, the boot length l-a returns to the normal operating length, so the internal There was a risk that the air would inflate the boots 10.

In order to eliminate such inconveniences, conventionally, the support tables 21 and 22 on which the respective joints 2 and 3 are placed are provided with a seat surface 21a on which the inter-plane distance Lb is set to a constant value in advance;
22a, and each first . The second reference surfaces 9a and 16a are brought into contact manually.

In the case of the bell-shaped constant velocity joint 3, the housing 16 is designed not to move in the axial direction with respect to the shaft 1, so the length LC from the reference surface 16a to the groove 1a in the housing 16 remains unchanged. . On the other hand, the length Ld from the boot mounting groove 1a to the reference surface 9a formed in the housing 9 of the tri-board type constant velocity joint 2 is variable as well since the boot length a is variable.

Therefore, the length Ld and the inter-plane distance Lb are set so that the boot length 1-a is the length in the normal operating state,
As described above, each first . If the second reference surfaces 9a, 16a are manually brought into contact with the seat surfaces 21a, 22a, the boot length 1-a is maintained at the length in the normal operating state.

Next, the end portion 10b of the boot 10 is expanded using a tool (for example, a screwdriver, etc.), and the grease in the grease can 23 or the grease pumped by a pump (not shown) is injected into the inside. Apply the specified amount of grease to the boots10.
The required amount can be injected into the inside, that is, inside the housing 9. Moreover, even when this drive shaft is attached to the vehicle body, the boot 10 will not be excessively inflated due to the air inside it.

In addition, the boot 1 attached to the bell-shaped constant velocity joint 3
Since the length of the boot 7 is unchanged, there is no problem as described above, and the end of the boot 17 is manually expanded using a tool, and the grease in the grease can 23 or the pump (not shown) is removed from there. The grease that has been pressure-fed can be injected into the boot 17, that is, into the housing 16 in the required amount.

(Problem to be Solved by the Invention) However, in the process of manually widening the end of the boot using a tool and injecting grease therefrom, during the process, There is a risk that the grease will scatter and it will not be possible to inject a predetermined amount of grease into the inside of the boot, and processing of the scattered grease requires skill, making the work complicated. Furthermore, since manual work is required, the process takes time, which is one of the factors that hinders the reduction in manufacturing costs.

The present invention has been made by focusing on such conventional problems, and uses a machine to automatically expand the end of the boot, which is an elastic membrane attached to the outer periphery of the shaft. The purpose is to ensure reliable work, shorten process time, and ultimately reduce manufacturing costs.

(Means for Solving the Problems) To achieve the above object, the present invention is such that the ends of an elastic membrane attached to the outer periphery of a shaft abut on two points at predetermined intervals in the circumferential direction, and the elastic membrane move the two points in the circumferential direction toward each other, bend and expand the elastic membrane in the circumferential direction, and create an injection opening between the shaft and the end of the elastic membrane. It consists of a claw part to be formed and a driving means for driving each claw part in synchronization, and a nozzle is inserted into the injection opening and a predetermined amount of liquid is injected into the inside of the elastic membrane body from the nozzle. It is characterized by

(Example) Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

FIG. 1 shows the front of the elastic membrane expansion device according to the present invention,
Fig. 3 is a partial cross-sectional view taken along line II-II shown in Fig. 3, Fig. 2 is a side view of a partially broken section taken along line II-II shown in Fig. 4 is a partially cutaway side view of the axial positioning device used with the opening device; FIG. 4 is a plan view taken along the mV-mV line shown in FIG. 3; and FIG.
6 is a partially cutaway side view showing the grease injection part, and parts common to those shown in FIG. 7.8 are given the same reference numerals and their explanations are partially omitted.

Elastic membrane expanding device 8 according to the present invention, shown in detail in Figure 1.2
0 is used in the assembly process of an automobile drive shaft in this embodiment, as shown in FIG. Therefore, before explaining in detail the structure of the elastic membrane expanding device 80 according to the present invention, the entire assembly device will first be explained.

As shown in Figure 3, in the previous process, a tri-board type constant velocity joint 2 and a bell type constant velocity joint 3 were attached to the shaft 1.
The shaft component with which the
It is located between the positioning device 33 and the positioning device 33.

The first positioning device 32 is installed on a first base 35 that is guided by a guide rail 34 and can move forward and backward in the axial direction of the shaft 1.

The first base 35 is driven by an NG (numerical control) motor (not shown), and is configured to control forward and backward movement of the first base with considerable accuracy.

This NC motor serves as a first driving means for a first gripping means, which will be described later.

A stopper 36 is fixed to the right end of the first base 35 in FIG. 3, and cylinders 38 and 39 for moving the rod 37 forward and backward in two stages are connected to the stopper 36. These cylinders 38 and 39 are fixed to the first base 35 by detents 40.

As shown in detail in FIG. 4, the rod 37 has a lever receiving portion 37a formed at its tip, and the lever receiving portion 37a has a lever receiving portion 37a that is attached to one side of the L-shaped lever 41. The tips 41a, 41a are connected. The center base of this "R" shaped lever 41.41 is rotatably connected to a bracket 43.43 by a support shaft 42.42, and the bracket 43.43 is connected to a side wall 44 erected on the base 35.
．． It is fixed at 44. The other end portions 41b, 41b of the lever 41.41 are one end portion 47a of an arm 47.47 that moves while being guided by two upper and lower guide bars 45.46 that extend between the side walls 44.44.

It is connected to 47a. Other end portion 47 of arms 47, 47
b, 47b are provided with clamp claws 48 as first gripping means.
48 is fixed.

The clamp claws 48, 48 are provided with a clamp on the outer periphery of the wheel-side shaft 18 at the joint 3, which is connected so that the intersection angle of the axis of the wheel-side shaft 18 with respect to the shaft 1 is variable within a predetermined range and cannot be relatively moved in the axial direction. A clamping edge 488 is formed which abuts and fixes the axial position of the clamping edge 488 (see FIG. 3). Further, the clamp claws 48, 48 have seat surfaces 48b, 48b that come into contact with the first reference surface 16a formed in the joint 3. This first reference plane 1
6a serves as a reference for the relative axial position of the shaft 1 with respect to the joint 21, since the shaft 1 and the joint 3 cannot move relative to each other in the axial direction.

The first base 35 is connected to the shaft 1 by an NC motor (not shown) as a first driving means.
When moving forward with respect to the shaft 1, the first reference surface 16a comes into contact with the first reference surface 16a and moves the first reference surface 16a, which was at the position a in FIG. 6, in the axial direction together with the shaft 1 to a predetermined first initial position. It has become. At that time, the cylinder 38 is actuated to move the rod 37 in the direction of the arrow in FIG.
1 is rotated in the direction of arrow B, the arm 47 is moved in the direction of arrow C, and the wheel-side shaft 18 is clamped in the middle. Here, the intermediate clamp is a state in which the shaft 18 is not completely gripped, but the shaft 18 is not completely gripped.
8 is held to such an extent that the axis of the shaft 1 is substantially aligned with the axis of the shaft 1.

When the first reference surface 16a is moved forward to a predetermined initial position by the NC motor as the first driving means, the clamp claw 48 as the first gripping means This action allows the wheel side shaft 18 to be completely gripped. At that time, the seat surface 48b is in contact with the first reference surface 16a. After that, the clamp claw 48 as this first gripping means
grips the wheel-side shaft 18, moves the joint 3 and the shaft 1 backward by moving the first base 35 backward with the NC motor serving as the first driving means, and moves the first reference surface 16a to the first position. It is arranged to be located at the reference position C.

Further, as shown in FIG. 3, this first positioning device 32
is equipped with an elastic membrane expanding device 50 according to the present invention that expands the end portion 17b of the boot 17 after the axial positioning of the shaft 1 and joint 3 is completed. In general, the device 32 is equipped with a grease injection device 52 for injecting grease into the boot 17 from the end 17b of the boot 17 expanded by the elastic membrane expansion device 50 through the nozzle 51. It is.

This grease injection device 52 consists of a nozzle 51 from which grease is ejected a predetermined number of times from its tip, a φ nozzle holder 53 that holds this nozzle 51, and various cylinders 54 and 55 that control the movement of this nozzle holder 53.

On the other hand, the first positioning device 33 is installed on a second base 57 that is guided by a guide rail 56 and can move forward and backward in the axial direction of the shaft 1. This second base 57 is driven by a pressure cylinder or the like (not shown),
The shaft 1 is moved to the first position by the pallet 31. When it is conveyed between the second positioning devices 32 and 33, it moves forward in one direction of the shaft.

A movable base 59 is held on the second base 57 via a guide rail 58 so as to be movable forward and backward in the axial direction of the shaft 1 . This movable base 59 is connected to a cylinder 61.62 via a fixed part 60.
2 is fixed on the first base 57 by a rotation stopper 63. Further, the axial movement of the cylinders 61 and 62 is regulated by a stopper 64 fixed on the second base 57, and the expansion and contraction of each cylinder 61 and 62 moves the movable base 59 in two steps in the axial direction of the shaft 1. It allows you to move forward and backward. And these two cylinders 6
1.62 is a second driving means for driving a second gripping means, which will be described later.

A fixed part 60 fixed on the movable base 59 has a cylinder 65 on the side opposite to the side to which the cylinders 61 and 62 are connected.
．． 66 are connected, and these cylinders 65, 66 are installed on the moving base 59 by a detent 67. A rod 68 is attached to the cylinders 65 and 66, and is configured to move forward and backward in two stages as the cylinders 65 and 66 expand and contract.

This rod 68 corresponds to the rod 37 shown in FIG.
Similarly, a lever holder 68a (corresponding to the reference numeral 37a shown in FIG. 2) is formed at the tip of the lever, and a lever 69 (
In the same figure, the tips of the parts (corresponding to the reference numeral 41) are connected.

The lever 69 rotates about the support shaft like the lever 41 shown in FIG. 2, and moves the arm 70 (corresponding to the reference numeral 47 in FIG. ,
45 and 46). A clamp claw 73 as a second gripping means corresponding to the clamp claw 48 as a first gripping means shown in the fourth tooth is fixed to the tip of the arm 70.

This clamp claw 73 is similar to the clamp claw 4 shown in FIGS.
8, and as shown in FIG. 6, the joint 2, which is connected to the shaft 1 so as to be movable in the axial direction, comes into contact with the outer periphery of the final drive side shaft 12 and fixes its axial center position. Clamping edge 73a
have.

Similarly, the clamp claw 73 has a seat surface 3b that comes into contact with a second reference surface 9a formed on the joint 2. This reference surface 9a serves as a reference for the relative position of the joint 2 with respect to the shaft 1 in the axial direction.

The seat surface 73b has a cylinder 61 as a second driving means.
．． 62 is driven and extended, and when the movable base 59 moves forward with respect to the shaft, it comes into contact with the second reference surface 9a, and the second reference surface 9a, which is at position d in FIG. It is arranged to move in the axial direction to a predetermined second phase device e.

At that time, the cylinder 65 is extended, drives the rod 68 and the lever 69, and the clamp claw 73 clamps the shaft 12 in the middle. Here, the term "intermediate clamp" refers to a state where the shaft 12 is not completely gripped, but is held to such an extent that the axis of the shaft 12 is substantially aligned with the axis of the shaft 1.

When the second reference surface 9a moves to the second initial position e, the clamp claw 73 serving as the second gripping means is moved to the cylinder 65.
66, the final drive side shaft 12 is completely gripped with the seat surface 73b in contact with the second reference surface 9a. After that, clamp claw 7
3 grips the shaft 12, the joint 2 is moved backward to position the second reference surface 9a at the second reference position f. This backward movement is performed by driving and contracting only the cylinder 61 and moving the movable base 59 backward by that amount.

Further, as shown in FIG. 3, this second positioning device has the present invention which expands the end portion 10b of the boot 10 after the relative axial positioning of the shaft 1 and the joint 2 is completed. An elastic membrane expansion device 80 according to the above is attached. In general, the device 32 is equipped with a grease injection device 82 for injecting grease into the boot 10 through a nozzle 81 from the end 10b of the boot 10 expanded by the elastic membrane expansion device 80. It is.

This grease injection device 82 consists of a nozzle 81 from which a predetermined amount of grease is ejected from its tip, a nozzle holder 83 that holds this nozzle 81, and various cylinders 84 and 85 that control the movement of this nozzle holder 83.

Above 1. The axial positioning device consisting of the second positioning device 32, 33, as shown in FIG. The distance Lb between the second reference position @c and f is maintained at a constant distance in the normal operating state, and the distance 1e and LC from the first reference position C to the ends 17b and 10b of each boot 17 and 10 are constant. Therefore, the absolute position of each boot end 17b, 10b is specified.

Therefore, as shown in FIG.
, 10b, the elastic membrane expanding devices 50.80 and the grease injection devices 52, 82 are prevented from shifting relative to each other.

Next, the structure of the elastic membrane expansion device 80 according to the present invention described above will be explained in detail.

This elastic membrane expansion device 80
3 is installed on the second base 57, but the first
It has a similar structure to the elastic membrane expanding device 50 installed on the first base 35 in the positioning device 32.
゛As shown in FIGS. 1 and 2, the elastic membrane expansion device 80 includes a boot 1 as an elastic membrane attached to the outer periphery of the shaft 1.
Two points 90.0 at a predetermined interval in the circumferential direction at the end 10b of
It has claw portions 92 and 93 that come into contact with 91. The claw portions 92 and 93 are formed at the tips of arms 94 and 95, respectively. The arms 94 and 95 are respectively connected to the second base 5.
The bearings installed on 7 are connected to pivot shafts 9B and 99 rotatably held in parts 96 and 97. Rotation axis 98.
Reference numeral 99 denotes levers 102 and 10 driven by cylinders 100 and 101 provided on the second base 57, respectively.
It is connected to 3.

Further, the rotating shafts 98 and 99 are respectively linked with heavy ring gears 104 and 104 shown in FIG.
4 and 104 mesh with gears formed on the interlocking shaft 105, so that when one rotation shaft 98 (or 99) rotates, the other rotation shaft 99 (or 98) rotates in synchronization. It has become.

These heavy ring gears 104 and interlocking shafts 105 are connected to the synchronizing mechanism 10.
6.

On the other hand, the nozzle 81 of the grease injection device 82 is inserted into the injection opening 10C of the boot 10, which is formed in the area where the claws 92 and 93 are closest to each other. This nozzle 81 is configured to eject a predetermined amount of grease from its tip, and is held by a nozzle holder 83. The nozzle holder 83 is configured to rotate in the direction of the arrow with respect to the rotation base 107 about the support shaft 108 . This nozzle holder 83 is connected to a damper 110 via a support shaft 109.

The damper 110 rotates around the support shaft 109 and has a spring 111 inside. One end of the spring 111 is connected to a fixed end 112 of the damper 110,
The other end is connected to a movable body 114 that moves in the axial direction together with a rod 113 driven by a cylinder 85. A limit switch 115 is installed between the movable body 114 and the fixed end 112 to detect when the movable body 114 approaches the fixed end 112.

The rotating base 107 rotates in the direction of arrow E about a support shaft 117 held by a side wall 44 .
4 and is connected to a rod 119 driven by.

Therefore, the nozzle 81 is first rotated by the cylinder 84 in the direction of the arrow E, and then by the cylinder 85 in the direction of the arrow. The reason why the nozzle 81 is rotated in two stages is to prevent the end of the shaft 1 to which the joint 2 is attached from getting in the way when it is attached to or detached from the second positioning device 33. This is to do so.

Next, the operation of the elastic membrane expanding mechanism according to the present invention will be explained.

As shown in FIGS. 3 and 6, the axial positioning of the shaft 1 to which the joint 2.3 is assembled is determined by the first step. Second
Once completed by the positioning device 32.33, each boot 1
The ends 17b and 10b of 7 and 10 are each elastic membrane expanding device 5.
It is located on 0.80 without any positional deviation.

Then, the cylinders 100, 101 shown in FIG. 1 are driven. At this time, even if there is a slight time difference between the driving of the cylinders 100 and 101, due to the tuning mechanism 106,
Rotating wheels 98 and 99 rotate simultaneously, and arms 94 and 95 simultaneously rotate in the direction of arrow E. This arm 94.95 is driven, and the claws 92, 93 formed at the tips thereof come into contact with two points 90.91 at a predetermined interval in the circumferential direction on the end 10b of the boot 10. And after that arm 94.9
5 are driven synchronously, the claws 92 and 93 move in the direction of bringing the two points 90 and 91 closer to each other in the circumferential direction.
Stops at predetermined interval positions.

Therefore, the end 10b of the boot 10 as an elastic membrane is bent and expanded in the circumferential direction, and an injection opening is formed between the shaft 1 and the end 10b of the boot 10 between the claws 92 and 93. 1
0G is formed.

At the stage when the injection opening 10C is formed, the cylinder 84 is driven, and the arm 118 and the nozzle 81 are moved to the rotating base 1.
07, it rotates in the direction of arrow E around the support shaft 11'7. Next, the cylinder 85 is driven to move the rod 113 forward. When the rod 113 moves forward, the nozzle 8
Nozzle 81 unless the tip of Nozzle 1 hits an obstacle on the way.
rotates together with the nozzle holder 83 about the support shaft 108 in the direction indicated by the arrow. If the tip of the nozzle 81 is not inserted into the injection opening 10G formed in the boot end 10b and comes into contact with the boot end 10b on the way, the spring 111 in the damper 110 will be compressed and the spring 111 will be movable. body 114
is close to the fixed end 112 and the limit switch 115 detects that it is not in a normal state. In that case, the nozzle 81
When the grease is ejected from the tip of the boot 10, the grease is scattered outside the boot 10, so the limit switch 115 works to transmit a signal to each device to instruct them to correct the operation or issue an alarm.

When the nozzle 81 rotates normally in the direction indicated by the arrow and the tip of the nozzle 81 is inserted into the boot 10 through the insertion opening 10G, a solenoid valve (not shown) opens and a predetermined amount of grease is released from the tip of the nozzle 81. Injected into the boot 10.

This completes the grease injection work, but this grease injection work is also performed in the same way on the elastic membrane expanding device 50 and the grease injection device 52 installed on the side of the first positioning device 32 shown in FIG. It will be done.

When the grease injection work is completed, joint 2,
In order to move the shaft 1, on which the pallet 3 is assembled, to the next work process, the elastic membrane expanding device etc. performs the opposite operation to the above-mentioned operation, releases the grip on the shaft 1 and the joint 2.3, and moves the pallet 31 onto the shaft 1. The shaft 1 is conveyed by.

Note that the present invention is not limited to the above-described embodiments, but can be applied to all cases where it is necessary to inject a predetermined amount of liquid into the inside of an elastic membrane attached to the outer periphery of a shaft from its end. be able to.

(Effects of the Invention) As described above, according to the present invention, the end portion of the elastic membrane attached to the outer periphery of the shaft comes into contact with two points at a predetermined interval in the circumferential direction, and each of the two points on the elastic membrane a claw that moves the points closer together in the circumferential direction, flexes and expands the elastic membrane in the circumferential direction, and forms an injection opening between the shaft and the end of the elastic membrane; and a driving means for driving each claw part in synchronization, and a nozzle is inserted into the injection opening and a predetermined amount of liquid is injected from the nozzle into the inside of the elastic membrane body. Therefore, the work of expanding the end portion of the boot as an elastic membrane body can be automated, making the work reliable and shortening the process time. Furthermore, it also contributes to lower manufacturing costs.

[Brief explanation of the drawing]

FIG. 1 shows the front of the elastic membrane expansion device according to the present invention,
Fig. 3 is a partial cross-sectional view taken along line II-II shown in Fig. 3, Fig. 2 is a side view of a partially broken section taken along line II-II shown in Fig. 4 is a partially cutaway side view of the axial positioning device used with the opening device; FIG. 4 is a plan view taken along the line IT--IT shown in FIG. 3; and FIG.
A partial cross-sectional view taken along the V line, FIG. 6 is a partially cut-away side view showing the grease injection part, FIG. 7 is a cut-away side view of the main part of an automobile drive shaft, and FIG. 8 is a conventional grease injection work. It is a partially cutaway side view showing a process. 1...Shaft, 2.3...Constant velocity joint, 10.17...Boot, 10b, 17b...Boot end, 10G...Injection opening, 92.93...Claw Department,
94.95... Arm, 98.99... Rotating shaft, 100.101... Cylinder, 106... Tuning line groove.

Claims (1)

[Claims] The end of an elastic membrane attached to the outer periphery of the shaft contacts two points at predetermined intervals in the circumferential direction, and moves the two points on the elastic membrane in a direction that brings them closer together in the circumferential direction. It consists of a claw part that is deflected and expanded in the circumferential direction to form an injection opening between the shaft and the end of the elastic membrane body, and a driving means that drives each of the claw parts in synchronization. . An elastic membrane expanding device, characterized in that a nozzle is inserted into the injection opening and a predetermined amount of liquid is injected into the elastic membrane from the nozzle.