JPS6320514Y2 - - Google Patents

Description

[Detailed description of the invention] A. Purpose of the invention (1) Industrial application field The present invention provides a boot for protecting at least a part of a structure as a workpiece for purposes such as waterproofing or dustproofing. The present invention relates to a tightening device for a tightening part for fixing a boot, which can automatically perform the tightening work required when fixing the boot to the outer circumference.

(2) Prior art In general, boots are attached to the outer periphery of a structure so as to surround and cover the protected part of the structure in an annular manner. After fitting into position, it is common to wrap a tightening band such as a steel belt around the boot attachment part and tighten it to fix it.

(3) Problems that the invention aims to solve Conventionally, the tightening work for the boot attachment part was done manually, so a lot of effort and time was required to attach the boot. Ta.

There have already been proposals for automating this tightening work (see Japanese Patent Application Laid-Open No. 137778/1983), but in that case, the tightening band is not automatically tightened by a machine. There is a problem that it is necessary to mold the ring into a complicated ring shape (see FIG. 1 of the above-mentioned publication), which complicates the entire process accordingly.

The present invention has been proposed in view of the above, and it is an object of the present invention to provide a tightening device for a boot fixing tightening portion that has a simple structure and can solve the above-mentioned problems when the tightening work is automated.

B. Structure of the invention (1) Means for solving the problem The present invention for achieving the above purpose involves wrapping a tightening band such as a steel belt around the outer periphery of the boot attachment part fitted to the outer periphery of the workpiece. A tightening device for a tightening part for fixing a boot, the machine base having tightening surfaces that can cooperate with each other to tighten one half circumference of the boot attachment part through the tightening band. a pair of first tightening members provided so as to be openable and closable;
Each of the first tightening members has a spring capable of resiliently holding the two first tightening members in the open position, and a tightening surface capable of mutually tightening the other half circumference of the boot mounting portion via the tightening band. It is comprised of a pair of second clamping members that are provided on the stand so as to be openable and closable, and a drive device that can drive both of the second clamping members to close, and is configured to tighten each pair of first and second clamping members. The surfaces cooperate with each other to form a tightening belt guide surface having a C-shaped cross section that can surround the boot attachment part when the first and second tightening members are open, and also have a is characterized in that it is provided with an interlocking mechanism that closes the first tightening member in conjunction with the closing operation of the second tightening member.

(2) Effect According to the above configuration, the first and second tightening members are each held in the open position, and the boot is attached to the tightening band guide surface having a C-shaped cross section formed by the tightening surfaces of these members. When the free end of the tightening band is pushed into the C-shaped gap between the tightening band guide surface and the boot mounting section with the attachment part surrounded, the free end will be guided to the tightening band guide surface. When the second tightening member is driven to close in the encircling state, the second tightening member and the first tightening member following the second tightening member are The closing operation allows the tightening band to be tightened substantially uniformly over the entire circumference of the boot attachment portion.

(3) Embodiment Hereinafter, as an embodiment of the present invention, a tightening device that can be used to attach a boot to a constant velocity joint of a front drive axle used in a front wheel drive vehicle will be explained with reference to drawings. .

First, FIG. 1 shows an example of a front wheel shaft for driving. The driving front wheel shaft 1 has an intermediate shaft portion 2 and end shaft portions 5 and 6 connected to both left and right ends of the intermediate shaft portion 2 via constant velocity joints 3 and 4, respectively. The open portion of each constant velocity joint 3, 4 is annularly surrounded and covered by a boot 7, 8, respectively. The large diameter mounting portion 9 of the boot 7 is
It is fitted onto the outer periphery of the constant velocity joint 3 and is tightened and fixed by a steel belt 10, and
The small diameter mounting portion 11 is fitted onto the outer circumference of the intermediate shaft portion 2 and is tightened and fixed by a steel belt 12.
On the other hand, the large diameter attachment part 13 of the boot 8 is fitted onto the outer circumference of the constant velocity joint 4 and the steel belt 14
The small diameter mounting portion 15 is fitted onto the outer circumferential portion of the intermediate shaft portion 2 and is fastened and fixed by a steel belt 16.

Now, FIGS. 2 and 3 show that when the open portions of the constant velocity joints 3 and 4 of the front drive axle 1 shown in FIG. 1 are surrounded and covered by the boots 7 and 8, for example, each boot 7 ,8 small diameter attachment part 11,1
An example of a tightening device used for winding and tightening steel belts 12 and 16 around the outer circumference of the steel belt 5 is shown.

Between a pair of side walls 18 and 19 erected on the machine base 17 to face each other, a pair of horizontal support shafts 20 and 2 are spaced apart from each other in the horizontal direction and run parallel to each other.
1 are rotatably supported. A gear 22 is fixed to the support shaft 20.
2 is a gear 2 on a gear shaft 23' rotatably supported by a gear support 23 protruding from the side wall 19;
It meshes with 4. The gear 24 is connected to the rod 2 of a piston 27 of a drive cylinder 26 supported by a support frame 25 disposed near the machine base 17.
It engages with a rack 29 formed at the tip of 8. Further, a sprocket 30 is fixed to a portion of the support shaft 20 between the gear 22 and the side wall 19, and this sprocket 30 is connected to the chain 3.
1 and is placed in interlocking relation with a sprocket 32 fixed on the support shaft 21 via the sprocket 32. The diameter of the pitch circle of sprocket 30 is equal to the diameter of the pitch circle of sprocket 32, and each sprocket 30, 32
The rotational phases of the support shafts 20 and 21 are always set to be equal to each other.

Therefore, when the rod 28 of the drive cylinder 26 expands and contracts, the rack 29 rotates the gear 24, and the gear 22 meshing with this gear 24 also rotates, thereby rotating the support shaft 20, and this support shaft 20 rotates. In conjunction with the shaft 20, the support shaft 21 rotates in the same phase as the support shaft 20.

The base end portions of a pair of side plates 34 and 35 of the swing frame 33 are fitted into a portion between the side wall 18 and the gear 22 on the support shaft 20 so as to be rotatable relative to the support shaft 20. The back plate of this swing frame 33 has a
The tip of the rod 38 of the piston 37 of the drive cylinder 36 supported by the support frame 25 is connected to the pivot 3
It is pivoted at 9.

A sliding rod 41 is held on a sliding holder 40 fixed on the side plate 35 of the swing frame 33 so as to be slidable in the axial direction, and the base end of the sliding rod 41 is rotatably held. The supported follow-up roller 42 can come into contact with the cam surface of the cam 43 fixed on the support shaft 20 between the pair of side plates 34 and 35, and the sliding rod 41
The tip of the link 44 is pivotally supported at one end of the link 44 . The other end of the link 44 is connected to a pair of side plates 34, 3
The link 46 is pivotally supported at the distal end of a link 46 whose base end is fixed to a horizontal rotating shaft 45 that is rotatably supported relative to the side plates 34 and 35 between the links 5 and 5.

The base ends of a pair of push-up claws 47, 47' are fixed on the rotation shaft 45 at a constant interval in the axial direction of the rotation shaft 45, and each push-up claw 4
A pair of sliding holders 4 supported by the swing frame 33 at positions corresponding to 7 and 47', respectively.
8 and 48' have corresponding lifting rods 49 and 48', respectively.
49' is held so as to be slidable in the vertical direction,
The tip of each push-up claw 47, 47' comes into contact with the lower end surface of the corresponding lifting rod 49, 49',
Each of the lifting rods 49, 49' can be pushed up against the lowering of the lifting rods 49, 49' due to their own weight.

A pair of first clamping bodies 50, 50' are provided at the upper ends of each lifting rod 49, 49'. each first
Since the clamping bodies 50 and 50' have similar structures, one of the first
The tightening body 50 will be explained in more detail.

The lifting rod 49 can freely slide in the axial direction relative to the sliding holder 48, but is restrained from rotating in the circumferential direction. The upper end of the lifting rod 49 is a fork 51, and a pivot shaft 52 parallel to the rotation shaft 45, supported within the fork 51, has a pair of first tightening members 53. , 54 are pivoted at their base ends so that they can swing open and close. The tips of each of the first tightening members 53 and 54 have an arcuate shape so that they can cooperate with each other to tighten the lower half circumferential surface of the small diameter attachment part 11 of the boot 7 via the steel belt 12. Clamping surfaces a ₁ and a ₁ ' having cross sections are formed, and between the base end portions of each of the first clamping members 53 and 54,
A tension spring 55 is tensioned at a position below the pivot shaft 52.

Therefore, the tips of the pair of first tightening members 53 and 54 are normally in open positions relatively distant from each other due to the action of the tension spring 55, but as will be described later, When tightening the lower half circumferential surface via the steel belt 12, the second tightening members 67 and 66 can be interlocked to swing in a direction toward each other. Then, when the drive cylinder 36 is operated and the rod 38 is extended, the swing frame 33 is moved between the sliding rod 41 and the pair of first clamping bodies 50, 5.
It occupies the position of the solid line in Fig. 3 together with 0', etc., and
When the rod 38 contracts, the swing frame 38, together with the sliding rod 41, the pair of first clamping bodies 50, 50', etc., swings counterclockwise in FIG. Occupy the position as shown.

At a position inside the pair of support shafts 20, 21, between the pair of side walls 18, 19, each support shaft 2
A pair of support beams 56 along a plane including 0, 21,
57 are supported, and sliding holders 58 and 59 are supported at substantially intermediate portions of the support beams 56 and 57, respectively. Each sliding holder 58, 59 has a sliding rod 60, 61 attached to the corresponding support beam 5.
A follower roller 6 is held in a slidable manner in a direction perpendicular to the longitudinal direction of the sliding rods 60 and 57, and is rotatably supported at the base end of each sliding rod 60 and 61.
2 and 64 are the support shafts 20 and 20 on the corresponding side, respectively.
A pair of second tightening members 66 constituting a second tightening body are in contact with the cam surfaces of cams 63, 65 fixed on the slide rods 60, 61, and at the tip of each sliding rod 60, 61. , 67 each have a bolt 6
8 and 69 are integrally connected.

The tip side of the second tightening member 60 has a pair of arm portions 66.
a and 66b, and the distal end side of the second tightening member 67 is formed by a pair of arm portions 6.
A pair of arm portions 66a, 67a which are formed in a bifurcated shape by 7a, 67b and which oppose each other cooperate with each of the first tightening members 53, 54 of the first tightening body 50 at their respective distal ends. A pair of arm portions 66b and 67b facing each other are provided with tightening surfaces a ₂ and a ₂ ′ having an arcuate cross section for tightening the outer periphery of the small diameter attachment portion 11 of the boot 7 via the steel belt 12. , the first at the tip, respectively.
A tightening surface having an arcuate cross section for tightening the outer periphery of the small-diameter attachment portion 15 of the boot 8 via the steel belt 16 in cooperation with a pair of first tightening members 53 and 54 (not shown) of the tightening body 50'. It has a ₂ and a ₂ ′.

The shape and size of the pair of cams 63 and 65 are the same, and the phase angles at which they are mounted on the corresponding support shafts 20 and 21 are shifted from each other by 180 degrees. In addition, the cam 43,
The shapes and mounting phase angles of 63 and 65 are set in advance so as to enable the following series of operations. That is, when the swing frame 33 is placed at the position indicated by the solid line in FIG. is pressed to slide the sliding rod 41 toward the tip side, and as a result, each push-up claw 47, 47' moves to the corresponding lifting rod 4.
9, 49' upwardly, the pair of cams 63, 65 move the following rollers 62, 64, respectively.
is pressed to move each sliding rod 60, 61 synchronously toward the tip side. At this time, each sliding rod 60, 61
As the pair of second tightening members 66 and 67 move toward the distal side, the pair of second tightening members 66 and 67 move toward each other, and the proximal shoulder portions of the second tightening members 66 and 67 move toward each other.
A clamping force is applied to each of the first clamping members 53, 54 by pressing inward the outer shoulder portions at the tips of the corresponding first clamping members 53, 54, respectively. The proximal shoulders of the second tightening members 66, 67 and the outer shoulders at the distal ends of the first tightening members 53, 54 cooperate with each other to constitute the interlocking mechanism M of the present invention. Also, the drive cylinder 26, rack 29,
Gears 24, 22, support shafts 20, 21, and cam 6
3 and 65 cooperate with each other to drive the drive device D of the present invention.
Configure.

Since the illustrated embodiment is configured as described above, when the respective drive cylinders 26 and 36 are operated in advance and the corresponding rods 28 and 38 are placed in the retracted state, the swing frame 33 is moved to the third position. While being swung downward to the position indicated by the chain line in the figure, the pair of second tightening members 66 and 67 occupy open positions relatively distant from each other due to the action of the cams 63 and 65, respectively.

Then, the driving front wheel axle 1, on which the boots 7 and 8 have been fitted in predetermined positions, is transported by a transport device (not shown), and each of the first clamping bodies 50,
50'.

Next, when the drive cylinder 36 is actuated to extend the rod 38, the swing frame 33 rotates around the support shaft 20 and swings upward from the position shown by the chain line in FIG. 3 to the position shown by the solid line. The following roller 42 is the cam 43
until it comes into contact with the cam surface.

In this state, the respective tightening surfaces of the distal ends of the first tightening members 53 and 54 of one first tightening body 50 and the arm portions 67a and 66a of the second tightening members 67 and 66
a ₁ , a ₁ ′; a ₂ , a ₂ ′ cooperate with each other to form a tightening belt guide surface G having a C-shaped cross section and surrounding the small diameter attachment portion 11 of the boot 7, so that the guide surface G and the corresponding When the free end of the steel belt 12 is pushed into the C-shaped gap between the outer circumferential surface of the small-diameter attachment part 11, the free end is guided by the guide surface G and advances in an annular shape, and eventually connects with the steel belt 12 itself. Once polymerized, the small-diameter attachment portion 11 can be surrounded by a steel belt 12 in an annular manner. Further, the respective tightening surfaces a 1 , a ₁ ′ of the tips of the first tightening members 53 and 54 of the other first tightening member 50′ and the arm portions 67b and 66b of the second tightening members 67 and ₆₈ ; a ₂ and a ₂ ' cooperate with each other to form a tightening belt guide surface G having a C-shaped cross section and surrounding the small diameter attachment part 15 of the boot 7, so that the guide surface G and the outer peripheral surface of the small diameter attachment part 15 When the free end of the steel belt 16 is pushed into the C-shaped gap between the steel belt 16 and the small diameter The mounting portion 15 can be surrounded by a steel belt 16 in an annular manner.

After the above steps, when the drive cylinder 26 is actuated to extend the rod 28, the gear 24 is rotated clockwise in FIG. As a result, the support shaft 20 rotates, and as a result, the support shaft 20
3 and 63 in the counterclockwise direction,
The support shaft 21, which is interlocked with the support shaft 20 via the sprocket 30, chain 31, and sprocket 32, rotates clockwise together with the cam 65. First, the cam 43 presses the sliding rod 41 toward the tip side via the following roller 42, and the pair of push-up pawls 47, 47' is moved via the links 44, 46 and the rotation shaft 45 as shown in FIG. The respective lifting bodies 4 are rotated counterclockwise at the
9, 49' upward. Subsequently, a pair of cams 63 and 65 move the following rollers 62 and 6, respectively.
4, the corresponding sliding rods 60 and 61 are pressed in a direction toward each other. At this time, the proximal shoulder portions of the second tightening members 66, 67 are connected to the corresponding first tightening members 53, 50' of the respective first tightening members 50, 50', respectively.
54, respectively abutting the upper end shoulders of each pair of first
While pressing the tightening members 53 and 54 in the closing direction so that they approach each other, the pair of arm parts 66a and 67a connect the upper half of the small diameter attachment part 11 to the steel belt 12.
The pair of arm portions 66b, 67
b tightens the upper half circumference of the small diameter attachment part 15 via a steel belt 16.

As described above, the small diameter attachment parts 11 and 15 are
The clamping surfaces a 1 , a 1 ′ and the second clamping surfaces a ₁ , a ₁ ′ of the first clamping members 53 , 54 are
Since they are securely tightened by the tightening surfaces a ₂ and a ₂ ' of the tightening members 66 and 67, in this state, the unnecessary parts of each steel belt 12 and 16 are cut off by an appropriate cutting means (not shown), and each The overlapping portions of the steel belts 12 and 16 are joined by a joining means such as laser welding.

From the above embodiments, it is clear that the tightening device based on the present invention can be configured to be able to tighten not only the small-diameter attachment parts 11 and 15 but also the large-diameter attachment parts 9 and 13, and furthermore, it can be used to fix any other boots. It is easy for a person skilled in the art to configure the fastening part so that it can be tightened.

C. Effect of the invention As described above, according to the invention, the tightening part for fixing the boot can be tightened by wrapping a tightening band such as a steel belt around the outer periphery of the boot mounting part fitted to the outer periphery of the workpiece. A pair of first tightening members, each of which has a tightening surface that can cooperate with each other to tighten one half circumference of the boot mounting portion through the tightening band, and is provided on the machine base so as to be openable and closable. and a spring capable of resiliently holding both of the first tightening members in the open position, and a tightening surface capable of mutually tightening the other half circumference of the boot mounting portion via the tightening band. It consists of a pair of second clamping members that are provided on the machine base so as to be openable and closable, and a drive device that can drive both of the second clamping members to close. The tightening surfaces cooperate with each other to form a tightening belt guide surface having a C-shaped cross section that can surround the boot mounting portion when the first and second tightening members are in the open state. An interlocking mechanism is provided between the members that closes the first tightening member in conjunction with the closing operation of the second tightening member, so that the first and second tightening members are held in the open position, respectively. In addition, in a state in which the boot mounting portion is surrounded by a tightening belt guide surface having a C-shaped cross section formed by the tightening surfaces of these members, a C-shape between the tightening strap guide surface and the boot mounting portion is formed. When the free end of the tightening band is pushed into the shaped gap, the free end is guided by the tightening band guide surface and advances in an annular shape, so that it can surround the boot attachment part in an annular shape, and in that surrounding state, the When the second tightening member is driven to close, the second tightening member and the first tightening member following it are operated to close, and the tightening band is tightened approximately evenly over the entire circumference of the boot attachment portion. As a result of the above, it is possible to accurately wrap the tightening band around the outer circumference of the boot attachment part without having to form the tightening band into a predetermined complex ring shape, and the tightening work after wrapping can be done automatically. It can be carried out precisely and accurately, and can greatly contribute to simplifying the process and improving work efficiency. Moreover, since the tightening surfaces of each pair of first and second tightening members also serve as guide surfaces for the tightening band when the tightening band is wrapped around the boot mounting portion in an annular manner, the first and second tightening members In combination with the fact that both can be driven by a common drive device, this can greatly contribute to simplifying the structure of the device, reducing costs and improving ease of assembly.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway side view showing an example of a front drive wheel axle, Fig. 2 is a cross-sectional plan view of a main part of a tightening device based on an embodiment of the present invention, and Fig. 3 is a tightening device shown in Fig. 2. FIG. 4 is a cross-sectional side view of the main part of the device, showing a part of the tightening device in an operating state different from that in FIG. 3. a ₁ , a ₁ ′; a ₂ , a ₂ ′...Tightening surface, D...Driving device,
G...Tightening band guide surface, M...Interlocking mechanism, 1...Front wheel axle as work, 7, 8...Boots, 11,1
5... Small diameter mounting part as a boot mounting part, 12,
16...Steel belt as a tightening belt, 17...
...Machine base, 53, 54...First tightening member, 55...
Spring, 66, 67... second tightening member.

Claims (1)

[Scope of utility model registration request] A fastening device for a boot fixing tightening part for wrapping and tightening a tightening band such as a steel belt around the outer periphery of a boot attaching part fitted to the outer periphery of a workpiece,
a pair of first clamping members each having a clamping surface capable of clamping one half circumference of the boot mounting portion in cooperation with each other via the clamping band, the pair of first clamping members being openably and closably provided on the machine base; (1) a spring capable of elastically holding the tightening member in the open position; and a tightening surface capable of mutually tightening the other half circumference of the boot mounting portion through the tightening band, and the device is opened and closed on the machine base. It consists of a pair of second clamping members that can be provided, and a drive device that can drive both of the second clamping members to close, and the clamping surfaces of each pair of first and second clamping members are mutually A tightening belt guide surface having a C-shaped cross section that can surround the boot mounting portion when the first and second tightening members are open is formed in cooperation with each other, and between the first and second tightening members, A tightening device for a boot fixing tightening part, characterized in that an interlocking mechanism is provided for closing the first tightening member in conjunction with the closing operation of the second tightening member.