JPH0442573Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a constant velocity universal joint used as a power transmission means for general industrial machinery, etc.

2. Description of the Related Art This type of constant velocity universal joint includes, for example, structures shown in FIGS. 3 and 4. This constant velocity universal joint consists of a pair of inner members 1, 1 arranged oppositely on the joint axis, and a sphere 2a integrally formed at the end of one inner member and integrally formed at the end of the other inner member. The pair of inner members 1, 1 each have two branch shafts 3, 3 which extend symmetrically outward in the radial direction of the inner members. The rollers 5, 5 are rotatably fitted to the branch shafts 3, 3 via needle bearings, etc., and are integrally formed with through holes 4, 4 perpendicular to the axes of the branch shafts 3, 3. A pair of plate-shaped outer members 6, 6 are arranged facing each other with the rollers 5, 5 in between, and the through holes 4,
Pins 7, 7 are arranged to penetrate through the through holes 4, and the spherical convex portions 7a, 7a provided at the intermediate parts of the pins 7,
The pins 7, 7 are in spherical contact with the spherical recesses 4a, 4a provided in the middle of the pins 4, and both ends of the pins 7, 7 are fixed to the outer members 6, 6, and the power is transmitted between the rollers 5, 5 and the outer member 6. Inner member 1, via inner member 6, 6
1, and centering on the spherical convex portions 7a, 7a provided at the intermediate portions of the pins 7, 7, the inner members 1, 1
is configured to take an operating angle.

And, this constant velocity universal joint has inner members 1, 1
are connected to the drive-side and driven-side shafts via shaft connection members 8, 8, respectively.

Problems to be Solved by the Invention By the way, in the constant velocity universal joint described above, a cylindrical metal joint cover 9 is provided on the outer periphery of the outer members 6, 6.
, and boots 10, 10 are installed between the openings at both ends of the joint cover 9 and the shaft connecting members 8, 8 to seal and maintain lubricating grease inside the joint, and to prevent dust, moisture, etc. from entering the joint from the outside. However, when this structure is used for agricultural machinery, such as one that transmits the power of a tractor to a working machine, scattered stones etc.
There is a risk that the boots 10 may be damaged by being hit directly by the
The largest diameter part and the large diameter side mounting part may come into contact with the floor, etc., and the boots 10, 10 may become deformed and come off due to contact, or
There is a risk of damage. When used for agricultural machinery, although not shown in the drawing, various members from the working machine extend in an intricate manner in the lower half of the driven side boot 10 on the left in FIG. These members make it difficult for stones and the like to directly hit the boot 10, and in this case, there is a risk of damage to the drive side boot 10 on the right side in FIG.

The purpose of this invention is to provide a structure that strengthens the joint cover itself and protects the boot.

Means for Solving the Problems This invention covers the outer member of the joint with a cylindrical joint cover made of a thin-walled rigid body, and the openings at both ends of the joint cover are covered with bellows-shaped parts that are fastened to the opening ends. The constant velocity universal joint sealed with a flexible boot is characterized in that ribs each having an outer diameter larger than the maximum diameter of the boot are provided near the boot fastening portion at both ends of the joint cover. .

Effect Providing ribs on the joint cover increases the rigidity of the joint cover itself. In addition, by locating each rib near the boot fastening part at both ends of the joint cover and making the outer diameter of the rib larger than the maximum diameter of the boot, the rib has the effect of protecting the bellows-shaped flexible boot. can get.

Embodiment Figures 1 and 2 are drawings showing an embodiment of the constant velocity universal joint of this invention, in which 11 and 11 are a pair of inner members of the constant velocity universal joint, and 12 and 12 are a pair of plate-shaped outer members. 13, 13 is a pin, 14 is a joint cover,
15, 15 are boots. A pair of inner members 1
Reference numerals 1 and 11 denote a cylindrical body 1 which is arranged opposite to each other on the joint axis, and has a sphere 16a integrally formed at the end of one inner member 11 and an integrally formed end of the other inner member 11.
6b and are connected so as to be bendable. Each of the inner members 11, 11 has two symmetrical branch shafts 17, 1 extending outward in the radial direction of the inner member.
7 is integrally formed, and these branch shafts 17, 17
rollers 18, 18 via needle bearings, etc., respectively.
are rotatably fitted and mounted, and furthermore, the branch shafts 17, 1
A spherical recess 19a, 1 is provided in the middle part perpendicularly to the axis of 7.
Through-holes 19, 19 each having a diameter 9a are bored therein. A pair of plate-shaped outer members 12, 12 are the inner member 1
A raceway surface 2 on which the rollers 18, 18 roll, which are arranged opposite to each other with the rollers 18, 18 provided on the rollers 1, 11 interposed therebetween.
0 and 20 are provided on both edges. Pin 13, 13
are disposed through the through holes 19, 19 provided in the inner member 11, and are formed in the intermediate portion of the spherical convex portions 13a, 1.
3a to the spherical recesses 19a, 19 of the through holes 19, 19.
a, and both ends are connected to the outer member 1.
It is fixed at 2,12. The joint cover 14 is
For example, it is formed into a cylindrical shape using a thin rigid member such as a thin steel plate, and is fitted onto the outer members 12, 12. The boots 15, 15 are made of an elastic member such as synthetic rubber so as to be expandable and contractible in a bellows shape, and the large diameter side openings 15a, 15a are connected to the boot bands 21a, 15a.
21a to the opening end of the joint cover 14, and the small diameter side openings 15b, 15b are fastened to the inner members 11, 11 by boot bands 21b, 21b.
It is fastened to shaft connecting members 22, 22 which connect the drive side shaft and the driven side shaft, respectively.

In the constant velocity universal joint having the above structure, in this invention, the outer peripheral surface of the joint cover 14 has a U-shaped cross section having an outer diameter d larger than the maximum diameter D of the boot 15 at multiple locations (two locations in the embodiment shown in the drawings). rib 14a,
14a are integrally formed. Each rib 14a is located near the boot fastening portions at both ends of the joint cover 14.

When the constant velocity universal joint of this invention is used for agricultural machinery, the rib 14a of the joint cover 14 increases the rigidity of the joint cover 14, so even if a stone or the like hits the joint cover 14 directly, the deformation of the joint cover 14 will cause a boot. This prevents the band from coming off. In addition, the rib 14a
Due to the presence of this structure, it becomes difficult for scattered stones and the like to directly hit the drive-side boot 15 on the right side in FIG. 1, and damage to the boot 15 can be prevented. Furthermore, even if the boots 15 are placed directly on the floor, the ribs 14a of the joint cover 14 eliminate the inconvenience of the boots 15 touching the floor.

Note that this invention is not limited to the constant velocity universal joint of the embodiment, but can be applied to various double biport type constant velocity universal joints.

Effects of the invention According to this invention, by providing the joint cover with ribs, the rigidity of the joint cover increases and it becomes difficult to deform. For this reason, it is difficult to deform even if it is directly hit by a stone or the like, and therefore, the problem of the conventional joint cover deforming and the boot band coming off can be solved.

In addition, since the ribs on the joint cover have a larger diameter than the boots, stones and other objects flying diagonally from below are blocked by these ribs, preventing them from hitting the boots directly as in the case of conventional methods. damage is prevented and durability is improved.

Additionally, the presence of multiple ribs with a diameter larger than the boot allows the assembly around the joint to be removed and placed directly on the floor, without the boot touching the floor. Therefore, there is no need to worry about the boots being deformed, coming off, or being damaged due to contact with the floor, as in the case of conventional boots.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of an embodiment of the constant velocity universal joint of this invention, Fig. 2 is a cross-sectional view taken along line A-A in Fig. 1, and Fig. 3 is a longitudinal cross-section of a conventional constant velocity universal joint. side view,
FIG. 4 is a sectional view taken along the line B--B in FIG. 3. 11, 11... Inner member, 12, 12... Outer member, 13, 13... Pin, 14... Joint cover, 14a, 14a... Rib, 15, 15... Boot.

Claims (1)

[Scope of utility model registration request] A constant velocity universal joint in which the outer member of the joint is covered with a cylindrical joint cover made of a thin-walled rigid body, and the openings at both ends of the joint cover are sealed with bellows-shaped flexible boots fastened to the opening ends. 2. A constant velocity universal joint according to claim 1, wherein ribs each having an outer diameter larger than the maximum diameter of the boot are provided near the boot fastening portions at both ends of the joint cover.