CN201982480U - Dust cover sealing structure of ball joint and ball joint provided with same - Google Patents

Abstract

A dust cover sealing structure of a ball joint and a ball joint having the structure. The ball joint includes: a housing having an opening at one end; a ball seat member embedded in the housing; a ball screw portion including a ball head rotatably accommodated in the ball seat member; and a dustproof A cover mounted on the ball screw portion in a state where an inward flange formed at an end portion of the dust cover is sandwiched between an outward flange provided on the ball seat member and an opening end surface of the housing. Between the housing and the boot seal structure of the ball joint, the outer flange of the ball seat member is provided with a first engaging portion for engaging with the first engaging portion of the inner flange of the dust cover. As for the engaged part, a second engaged part for engaging with the second engaging part of the inward flange of the dust cover is provided on the opening end surface of the housing. According to the present invention, even when the rotation angle of the ball joint is large, it is possible to reliably prevent the dust cover from coming off.

Description

Dust cover sealing structure of ball joint and ball joint having the same structure

technical field

The utility model relates to a dustproof cover sealing structure of a ball joint and a ball joint with the structure.

Background technique

It is well known to use ball joints on numerous mechanical structures, for example ball joints used on vehicle suspensions (suspensions) or steering devices (steering).

As such a ball joint, for example, the ball joint described in Patent Document 1 includes: a housing having an opening at one end; The inward flange formed at the end portion is sandwiched between the outward flange provided on the ball seat member and the opening end surface of the housing, and is installed between the ball screw portion and the housing. In the dust cover, an annular engagement portion that cooperates with each other to prevent the diameter expansion deformation of the inward flange is provided between the inward flange of the dust cover and the outward flange of the ball seat member, and the inward The inner diameter of the flange in a natural state is smaller than the size of the portion of the outer diameter flange corresponding to the inward flange.

In Patent Document 1, the ring-shaped engagement portion between the inward flange of the dust cover and the outward flange of the ball seat member is used to prevent the detachment of the dust cover when the ball joint is in operation, and the inner diameter of the inward flange is smaller than the outer diameter. The size of the part corresponding to the inward flange of the radial flange, so that when the inward flange is locked on the outward flange, the small-sized inward flange exerts a pressing force on the part of the outward flange corresponding to the inward flange, prompting The two are tightly locked.

However, for ball joints used in automobiles, such as φ19 ball joints, the swing angle is relatively large, reaching 28.5°. Since the dust cover in Patent Document 1 is in plane contact with the opening end surface of the housing, only the inward movement of the dust cover The engagement of the flange with the outward flange of the ball seat member hardly suppresses the lower part of the dust cover from coming off, and the lower part of the dust cover slides out along the plane as the dust cover is tilted.

Patent Document 1: Japanese Patent No. 3369659

Utility model content

The utility model is made to solve the above problems, and its purpose is to provide a dust cover sealing structure of a ball joint that can reliably prevent the dust cover from detaching even when the rotation angle of the ball joint is large, and a structure having the same structure. ball joint.

The first technical solution of the present utility model is a sealing structure of a dust cover of a ball joint, including:

a housing having an opening at one end;

a ball seat member embedded in said housing;

a ball screw portion including a ball head portion freely rotatably accommodated in the ball seat member;

a dust cover mounted on the ball head in a state in which an inward flange formed at an end portion of the dust cover is sandwiched between an outward flange provided on the ball seat member and an opening end surface of the housing. Between the screw part and the above housing,

It is characterized in that,

The outer flange of the above-mentioned ball seat member is provided with a first engaged part for engaging with the first engaging part of the inward flange of the dust cover, and the opening end surface of the above-mentioned housing is provided with a The second engaged part engaged with the second engaging part of the inward flange of the dust cover.

According to the first technical solution of the present utility model, the outer flange of the ball seat member is provided with a first engaged portion for engaging with the first engaging portion of the inward flange of the dust cover, and the opening of the housing The end face is provided with a second engaged portion for engaging with the second engaging portion of the inward flange of the dust cover, thus, the ball seat member and the housing are respectively provided with the inward flange of the dust cover. Thereby, the three can be reliably engaged, and even if the swing angle is too large, the lower surface of the dust cover will not be detached.

The second technical solution of the present utility model is that in the first technical solution, the above-mentioned first engaging portion and the second engaging portion are formed at the inner end of the inward flange of the above-mentioned dust cover, protruding in opposite directions respectively. The protrusion, the first engaged portion at the outward flange of the above-mentioned ball seat member and the second engaged portion at the opening end surface of the above-mentioned housing are grooves.

According to the second technical solution, the first and second engaging portions of the inward flange of the dust cover are formed at the inner end, and are respectively protrusions protruding in opposite directions, and the first engaging portions of the outward flange of the ball seat member are engaged. The joint part and the second engaged part of the opening end surface of the housing are grooves, which can be easily manufactured, and the dust cover can be securely engaged between the ball seat member and the housing with a low cost and simple structure.

According to a third technical solution of the present invention, in the second technical solution, the groove as the second engaged portion is defined by the ball seat member and the housing.

According to the third technical solution, since the groove as the second engaged portion is defined by the ball seat member and the housing, the housing can be formed thinner, which can be easily manufactured and can be achieved. The dust cover is securely engaged between the ball seat member and the housing with a low-cost and simple structure.

The fourth technical solution of the present utility model is that in the above technical solution, the outermost part where the outer edge of the above-mentioned first engaged portion abuts against the inward flange of the above-mentioned dust cover is the first abutment point, and the above-mentioned second The outermost point where the outer edges of the two engaged parts abut against the inward flange of the dust cover is the second abutment point, and the second abutment point is relative to the central axis of the casing passing through the first abutment point Parallel straight lines are located on the opposite side to the above-mentioned ball seat member.

According to the fourth technical solution, the outermost point where the outer edge of the first engaging portion abuts against the inward flange of the dust cover is the first abutment point, and the outer edge of the second engaging portion and the outer edge of the dust cover The outermost part of the abutment of the inward flange is a second abutment point, which is located on the opposite side of the ball seat member with respect to a straight line passing through the first abutment point parallel to the central axis of the housing. Here, the engagement and abutment points between the outward flange of the ball seat member and the opening end surface of the housing and the inward flange of the dust cover are staggered in a direction parallel to the central axis of the housing, and the opening of the housing at the second abutment point The end faces the inward flange of the dust cover to have a supporting force obliquely inward, which can further securely engage the dust cover between the ball seat member and the housing.

The fifth technical solution of the present utility model is that in the above technical solution, the radial dimension of the first engaging portion of the inward flange of the dust cover is smaller than the second engaging portion of the inward flange of the dust cover Correspondingly, the radial dimension of the first engaged portion is smaller than the radial dimension of the second engaged portion.

The sixth technical solution of the present utility model is that in the above-mentioned fourth technical solution, the top end surface of the above-mentioned second engaging part is a conical surface whose diameter gradually expands towards the bottom side of the housing, and correspondingly, the above-mentioned second clamped The bottom surface of the engaging portion opposite to the top end surface of the second engaging portion is also formed as a conical surface whose diameter gradually increases toward the bottom side of the housing.

A seventh technical solution of the present invention is a ball joint having the above-mentioned dust cover sealing structure.

According to the present invention, it is possible to provide a boot seal structure of a ball joint capable of reliably preventing the boot from coming off even when the rotation angle of the ball joint is large, and a ball joint having the structure.

Description of drawings

Fig. 1 is the overall structure diagram of the ball joint of the present invention.

Fig. 2 is a partial sectional view showing a boot engaging portion of the ball joint.

Fig. 3 is a diagram showing an overall configuration of a conventional ball joint.

Detailed ways

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is an overall structural view of a ball joint of the present invention, and FIG. 2 is a partial cross-sectional view showing a dust cover engaging portion of the ball joint. In the drawings, the side facing the central axis of the ball joint in the horizontal direction is the inner side, and the side facing the opposite side is the outer side. The "radial direction" in this application refers to the radial direction of the housing.

As shown in FIG. 1 , the ball joint includes a housing 1 for connecting to one not-shown member and a ball-screw portion 2 for connecting to the other not-shown member. The housing 1 is formed in a bottomed cylindrical shape, has an opening at one end, and integrally includes a rod 3 protruding radially outward from its outer peripheral surface to be connected to the one member described above. A groove 4 for engaging with a dust cover described later is also provided on the opening end surface of the housing 1 .

On the inner side of the bottom of the housing 1, the ball seat 5 is embedded and fixed in the housing 1 by fastening the protruding part 6 integrally formed at the bottom of the ball seat 5. The ball seat 5 is made of synthetic resin and has a substantially bottomed shape. Cylindrical. An outward flange 8 protruding radially outward is formed at the end portion of the ball seat 5 on the opening 7 side, and an engaging portion for engaging with a dust cover described later is formed on the lower surface of the outward flange 8 . The engaging groove 9 is continuously formed along the entire circumference of the outward flange 8 of the ball seat 5 as an engaged portion.

The spherical head 10 of the ball-screw part 2 is rotatably housed inside the ball seat 5, and the threaded part 11 connected to the spherical head 10 is used for screwing the other member mentioned above. A radially outward flange 12 is integrally provided at a substantially central portion of the ball screw portion 2 .

In order to close the opening 7 of the ball seat 5, the dust cover 13 provided between the outward flange 8 of the housing 1 and the lower part of the flange 12 of the ball screw part 2 is made of elastic body such as rubber and is formed in an umbrella shape. A small-diameter opening is provided at the top thereof, and an inward flange 14 bent radially inward is formed on the inner peripheral edge of the opening on the enlarged diameter side along the entire circumference. The inner end of the inward flange 14 clamped between the ball seat 5 and the housing 1 is provided with two protrusions 15, 16 facing oppositely (protruding upwards and downwards in the figure), the two protrusions 15, 16 is used as an engaging part to engage with the groove 9 of the outward flange 8 of the ball seat 5 and the groove 4 of the opening end surface of the housing 1, so that the dust cover 13 is clamped between the ball seat 5 and the housing 1 between.

In this way, the two protrusions 15, 16 of the inward flange 14 of the dust cover 13 are respectively engaged with the grooves of the ball seat 5 and the housing 1, so that the three can be reliably engaged, even if the swing angle is too large, Also does not make the lower surface of the dust cover 13 come off.

Moreover, the groove 4 of the housing 1 is defined between the outer peripheral surface of the ball seat 5 and the groove portion extending in the entire circumferential direction formed on the inner peripheral side of the opening end of the housing 1, so that the thickness of the housing 1 can be reduced. It is formed thin so that it can be easily manufactured, and the dust cover 13 can be securely locked between the ball seat 5 and the housing 1 with a low-cost and simple structure.

As shown in Figure 2, the outermost part where the outer edge of the groove 9 of the outward flange 8 of the ball seat 5 abuts against the inward flange 14 of the dust cover 13 is the first abutment point 17, and the housing 1 The outermost part where the outer edge of the groove 4 of the opening end surface of the opening end abuts against the inward flange 14 of the dust cover 13 is the second abutment point 18, then the second abutment point 18 is relative to the passage through the first abutment point 17 A straight line parallel to the central axis of the housing 1 is located on the opposite side to the ball seat 5 . As a result, the outward engagement points of the outward flange 8 of the ball seat 5 and the opening end surface of the housing 1 and the outer side of the inward flange 14 of the dust cover 13 are staggered along the radial direction of the housing 1, at the second contact point 18 The opening end of the housing 1 faces the inward flange 14 of the dust cover 13 with a support force obliquely inward, which restricts the inward flange 14 of the dust cover 13 from moving outward, and can further securely engage the dust cover 13 Between the ball seat 5 and the housing 1.

In addition, as shown in Figures 1 and 2, most of the inward flange 14 of the dust cover 13 is located outside the outward flange 8 of the ball seat 5, so when the ball head rotates, it is located on the outward flange of the ball seat 5. That part outward flange 14 of the outside of 8 can be out of shape together with ball head rotation, and therefore, dust cover 13 can not bring hindrance to ball head rotation, makes ball head rotate flexibly.

In addition, as shown in Figures 1 and 2, the radial thickness of the protrusion 16 of the dust cover 13 is greater than the radial thickness of the protrusion 15, and the top end surface (lower end in the figure) of the protrusion 16 is gradually diametrically towards the bottom side of the housing. Corresponding to the enlarged conical surface, the bottom surface of the groove 4 (the surface opposite to the top end surface of the protrusion 16 ) is also formed as a conical surface whose diameter gradually increases toward the bottom side of the housing.

Of course, the radial thickness of the protrusion 16 of the dust cover 13 may be the same as the radial thickness of the protrusion 15 . Alternatively, the top end (lower end in the figure) of the protrusion 16 may be flat, and the bottom surface of the groove 4 may also be flat correspondingly.

In the above-mentioned embodiment, it is exemplified that a protrusion is provided on the dust cover 13, and a groove is provided on the ball seat 5 and the housing 1 to form the engaging part and the engaged part, but the utility model is not limited thereto, and Protrusions are provided on the casing 1 and grooves are provided on the lower surface of the dust cover 13, as long as the three are firmly engaged, the engaging shape can be changed arbitrarily. In addition, in the above-mentioned embodiment, the engaging mechanism on the dust cover 13, the ball seat 5, and the housing 1 is formed continuously along the entire circumference, but it is not limited to this, and it can also be formed intermittently, as long as the engaging mechanism is formed In the corresponding positions of the three.

According to the present invention, it is possible to provide a boot seal structure of a ball joint capable of reliably preventing the boot from coming off even when the rotation angle of the ball joint is large, and a ball joint having the structure.

Claims (7)

1. A dust cover sealing structure of a ball joint, the ball joint comprising: a housing having an opening at one end; a ball seat member embedded in said housing; a ball screw portion including a ball head portion freely rotatably accommodated in the ball seat member; a dust cover mounted on the ball head in a state in which an inward flange formed at an end portion of the dust cover is sandwiched between an outward flange provided on the ball seat member and an opening end surface of the housing. Between the screw part and the above housing, It is characterized in that, The outer flange of the above-mentioned ball seat member is provided with a first engaged part for engaging with the first engaging part of the inward flange of the dust cover, and the opening end surface of the above-mentioned housing is provided with a The second engaged part engaged with the second engaging part of the inward flange of the dust cover. 2. The dust cover sealing structure of a ball joint according to claim 1, wherein: The first engaging portion and the second engaging portion are formed at the inner end of the inward flange of the dust cover, and are protrusions respectively protruding in opposite directions, The first engaged portion at the outward flange of the ball seat member and the second engaged portion at the opening end surface of the housing are grooves. 3. The dust cover sealing structure of a ball joint according to claim 2, wherein: The groove as the second engaged portion is defined by the ball seat member and the housing. 4. The dust cover sealing structure of a ball joint according to any one of claims 1 to 3, wherein: The outermost point where the outer edge of the first engaged portion abuts against the inward flange of the dust cover is the first abutment point, and the outer edge of the second engaged portion is in contact with the inward flange of the dust cover. The outermost portion where the flanges abut is a second abutment point located on the opposite side to the ball seat member with respect to a line passing through the first abutment point parallel to the central axis of the housing. 5. The dust cover sealing structure of a ball joint according to any one of claims 1 to 3, wherein the radial dimension of the first engaging portion of the inward flange of the dust cover is smaller than that of the dust cover. Corresponding to the radial dimension of the second engaging portion of the inward flange of the dust cover, the radial dimension of the first engaged portion is smaller than the radial dimension of the second engaged portion. 6 . The dust cover sealing structure of a ball joint according to claim 4 , wherein the top end surface of the second engaging portion is a conical surface whose diameter gradually increases toward the bottom side of the housing, and correspondingly, The bottom surface of the second engaged portion facing the top end surface of the second engaging portion is also formed as a conical surface whose diameter gradually increases toward the bottom side of the housing. 7. A ball joint, characterized by having the boot seal structure of the ball joint according to any one of claims 1 to 6.

Images