JP3815697B2 - Constant velocity joint boot structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a constant velocity joint that is used for a propeller shaft or the like of an automobile and in which an inner is inserted into an outer and transmits rotation at a constant speed, and a lubricant or the like is sealed inside the outer, and dust, water, etc. from the outside The present invention relates to a boot structure for preventing the intrusion of water.
[0002]
[Prior art]
As a conventional general structure of a boot in a constant velocity joint, an example described in Japanese Patent Application Laid-Open No. 59-144820 will be described with reference to FIG .
[0003]
The constant velocity joint 01 has an inner 03 fitted in a cylindrical outer 02, and a ball 04 rotatably supported by the inner 03 engages with a groove formed on the inner surface of the outer 02, so that the outer Even if the rotational center axes of 02 and inner 03 have an angle, the rotational torque is transmitted at a constant speed.
[0004]
A boot 05 provided in such a constant velocity joint 01 is connected to one open end of a cylindrical metal adapter 06 by crimping one end of a rubber-made cylindrical bellows 07. The other open end of the adapter 06 is fitted to the outer 02 of the constant velocity joint 01 via the O-ring 08, and the other end of the bellows 07 is fitted to the inner 03 of the constant velocity joint 01. The outer 02 is sealed and held inside.
[0005]
In addition, JP-A-63-269724, JP-A-62-2837, etc. describe the boot structure of a constant velocity joint, but the basic structure is the same as described above.
[0006]
[Problems to be solved by the invention]
As described above, the conventional boot 05 has many production steps because the adapter 06 and the bellows 07 are individually created and connected by crimping the ends of both.
In particular, the adapter 06 is made of metal and needs to be plated or painted in consideration of rust corrosion resistance.
[0007]
Also, an O-ring 08 is required to fit the adapter 06 into the outer 02 of the constant velocity joint 01 in a watertight manner, and it must be tightened or bolted to prevent it from coming off. Attaching work is not easy.
In this way, the processing and manufacturing work of the boots and the work of assembling the boots are troublesome and the cost becomes high.
[0008]
The present invention has been made in view of the above points, and the object of the present invention is to provide a boot structure for a constant velocity joint that has a small number of parts, can be easily manufactured, and can reduce costs.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a cylindrical adapter part joined to the outer part of a constant velocity joint, and the other opening end extending continuously from the adapter part to the inner part of the constant velocity joint. In a boot comprising a flexible bellows part to be joined, a flexible member constituting the bellows part continuously embeds a cylindrical reinforcing bracket inside to constitute the adapter part, and the cylindrical reinforcing bracket A constant velocity joint in which a recess is formed in the circumferential direction, and a protrusion is insert-molded on the inner circumferential surface of the flexible member of the adapter portion along the circumferential direction in accordance with the recess of the cylindrical reinforcing metal fitting. The boot structure.
[0010]
This boot has an integrated structure in which a cylindrical reinforcing bracket is embedded in an adapter section that is formed continuously from the bellows section.It can be easily manufactured by insert molding, and the reinforcing bracket of the adapter section is exposed to the outside. No rust and corrosion resistance.
[0011]
When the adapter portion is fitted to the outer part of the constant velocity joint, water tightness is maintained without interposing an O-ring, the number of parts is small, and the assembling work is easy.
Therefore, it is possible to reduce the cost by reducing the boot processing cost and the boot assembly cost to the constant velocity joint.
[0012]
By forming a concave portion in the circumferential direction in the cylindrical reinforcing metal fitting, and forming a protrusion on the inner peripheral surface of the flexible member of the adapter portion in the circumferential direction in accordance with the concave portion of the cylindrical reinforcing metal fitting , etc. The outer joint of the speed joint and the adapter of the boot can be securely fitted and prevented from coming off.
[0013]
The adapter part is made with the constant velocity fitting cylindrical portion and the step portion to reduce the diameter through the cylindrical portion fitted on the outer periphery of the outer joint, the formation of the protrusion into the fitting cylindrical portion claims When the boot structure of the constant velocity joint according to Item 1 is used, when the adapter portion of the boot is joined to the outer portion of the constant velocity joint, the fitting cylindrical portion is placed on the outer periphery, and the stepped portion is in contact with the outer end surface. It is possible to easily position by inserting and improving the workability, and it is possible to secure the detachment by positioning the protrusion at a predetermined position.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment according to the present invention will be described with reference to FIGS.
FIG. 1 is a side view showing a partial cross section of a boot 10 according to the present embodiment.
The boot 10 includes a bellows portion 11 and an adapter portion 12 having a substantially cylindrical shape.
[0015]
The bellows portion 11 is made of rubber having flexibility, and a large-diameter end portion 11c is formed through a curved portion 11b curved so as to be turned outward from the small-diameter cylindrical portion 11a, so that the curved portion 11b is flexible. It can be deformed.
[0016]
The rubber member is bent from the large-diameter end portion 11c of the bellows portion 11 and extends to the cylindrical adapter portion 12 covering the outer periphery of the curved portion 11b, and the adapter portion 12 has a cylindrical shape. A reinforcing bracket 13 is embedded.
The adapter portion 12 includes a cylindrical portion 12a that substantially covers the bellows portion 11 and a fitting cylindrical portion 12c that is expanded in diameter via a step portion 12b, and the reinforcing metal fitting 13 is also embedded throughout the same shape.
[0017]
The reinforcing metal fitting 13 in the fitting cylindrical portion 12c has a concave portion 13a partially extending in the circumferential direction, and a protrusion 12d is formed on the inner peripheral surface of the fitting cylindrical portion 12c of the rubber member in accordance with the concave portion 13a. Has been.
[0018]
On the outer peripheral surface of the end of the small-diameter cylindrical portion 11a of the bellows portion 11, a shallow groove 11d is formed.
Such a boot 10 is manufactured by inserting a reinforcing fitting 13 and molding it integrally when a rubber member is vulcanized.
[0019]
A state in which the boot 10 is mounted on the constant velocity joint 1 is shown in FIG.
The constant velocity joint 1 is a tripod type joint and is used for a drive shaft of an automobile.
[0020]
The outer joint 2 of the constant velocity joint 1 has a cylindrical shape, and three grooves extending in the axial direction are formed at equal intervals on the inner peripheral surface, while the inner 3 is an inner shaft that is integrally connected to the drive shaft. Three tripods 3a project in the radial direction in the portion 3b, and the three tripods 3a are slidably fitted into the three grooves to transmit power.
Grooves 2a are formed at predetermined locations on the outer circumferential surface of the outer 2 in the circumferential direction.
[0021]
When the boot 10 is assembled to the constant velocity joint 1, first, the small diameter cylindrical portion 11a of the bellows portion 11 of the boot 10 is fitted into a predetermined portion of the inner shaft portion 3b, and the fastening band 15 is attached to the groove 11d on the outer peripheral surface. The three tripods 3a at the end of the inner shaft portion 3b are inserted into the grooves of the outer 2 in this state.
[0022]
Then, the fitting cylindrical portion 12 c of the adapter portion 12 of the boot 10 is fitted on the outer periphery of the opening end portion of the outer 2.
Since the fitting cylindrical part 12c of the adapter part 12 is fitted and inserted into the outer periphery of the outer part 2 until the step part 12b of the adapter part 12 comes into contact with the opening end of the outer part 2, positioning is easy and workability is good.
[0023]
Thus, when the adapter portion 12 is fitted at a predetermined position of the outer 2 of the constant velocity joint 1, the ridge 12d formed on the inner peripheral surface of the fitting cylindrical portion 12c is a groove formed on the outer peripheral surface of the outer 2. The adapter part 12 is prevented from coming off by fitting into the strip 2a.
[0024]
As described above, the boot is attached as shown in FIG. 2, and the adapter portion 12 of the boot 10 is fitted to the outer periphery of the outer 2 via the pressure contact of the rubber member. The inside is sealed in a watertight manner, preventing leakage of the lubricant to the outside and the like, and preventing entry of dust, water, etc. from the outside.
[0025]
As described above, the boot 10 is integrally manufactured by insert molding in which the reinforcing metal fitting 13 is embedded, and there is no connection process between the bellows part and the adapter part, and the manufacturing process is simple and simple.
Since the reinforcing metal fitting 13 is embedded in the rubber member and shielded from the outside world, it has excellent corrosion resistance against rust and the like, and no plating or painting is required.
[0026]
In order to fit the adapter portion 12 of the boot 10 to the outer 2 of the constant velocity joint 1, a sealing member such as an O-ring is unnecessary, the number of parts is small, and the assembling work is easy.
Thus, the processing cost of the boot 10 and the assembly cost to the constant velocity joint 1 can be reduced, and the cost can be reduced.
[0029]
【The invention's effect】
The present invention is a boot having an integral structure in which a cylindrical reinforcing bracket is embedded in an adapter portion formed continuously from a bellows portion, which can be easily manufactured by insert molding, and the reinforcing bracket of the adapter portion is exposed to the outside world. Because it does not have excellent rust corrosion resistance.
[0030]
When fitting the adapter part to the outer part of the constant velocity joint, water tightness is maintained without interposing an O-ring, the number of parts is small, and the assembly work is easy. The cost can be reduced by reducing the cost of assembling the boot to the joint.
[0031]
By adopting a boot structure in which a protrusion is formed on the inner peripheral surface of the adapter portion in the circumferential direction, the outer joint of the constant velocity joint and the adapter of the boot can be reliably fitted and prevented from coming off.
[0032]
By configuring the adapter part from the fitting cylindrical part formed with the ridge and the cylindrical part reduced in diameter through the step part, the fitting cylindrical part is inserted into the outer periphery until the step part contacts the outer end surface. Thus, the positioning can be facilitated, the workability can be improved, and the protrusion can be positioned at a predetermined position to ensure the retaining.
[Brief description of the drawings]
FIG. 1 is a side view showing a partial cross section of a boot according to an embodiment of the present invention.
FIG. 2 is a side view with a partial cross section showing a state in which the boot is mounted on a constant velocity joint.
FIG. 3 is a side view with a partial cross section showing a state in which a conventional boot is mounted on a constant velocity joint.
[Explanation of symbols]
1 ... Constant velocity joint, 2 ... Outer, 3 ... Inner,
10 ... Boots, 11 ... Bellows, 12 ... Adapters, 13 ... Reinforcing brackets, 15 ... Tightening bands .

Claims (2)

A cylindrical adapter part joined to the outer part of the constant velocity joint, and a flexible bellows part extending continuously from the adapter part and joining the other opening end to the inner part of the constant velocity joint. In boots,
The flexible member constituting the bellows part continuously embeds a cylindrical reinforcing bracket inside to constitute the adapter part,
Forming a concave portion in the circumferential direction in the cylindrical reinforcing bracket,
A boot structure of a constant velocity joint, characterized in that a protrusion is insert-molded on the inner peripheral surface of the flexible member of the adapter portion along the circumferential direction in accordance with the concave portion of the cylindrical reinforcing metal fitting.   The adapter portion includes a fitting cylindrical portion that fits to the outer periphery of the outer periphery of the constant velocity joint and a cylindrical portion that has a diameter reduced via a step portion, and the concave portion and the protrusion are formed on the fitting cylindrical portion. The constant velocity joint boot structure according to claim 1, which is formed.

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