JPH0755124Y2 - Equalizer beam dustproof device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The dustproof device for an equalizer beam according to this invention is intended to prevent dust (including waterproof) of the equalizer beam that constitutes a suspension device for a large heavy vehicle.

(Prior Art) In a suspension system for a rear wheel of a large and heavy vehicle such as a truck, as shown in FIG.
Are attached to the front and rear ends of the equalizer beam 2.
Then, the center of the equalizer beam 2 is pivotally attached to a receiving portion 4 provided on the lower surface of the vehicle body 3 by a pivot shaft 5, and the front and rear wheels 6 and 6 attached to the axle shafts 1 and 1 are mounted on the vehicle body 3 based on the unevenness of the road surface.
However, even if they are moved up and down unequally, equal loads are applied to the wheels 6, 6.

The front and rear end portions of the equalizer beam 2 as described above are the fifth to seventh
It is configured as shown in the figure. That is, the cylindrical casing 7 is welded to the end of the equalizer beam 2 formed by combining and welding thick steel plates. The axial direction of the casing 7 is aligned with the width direction of the vehicle (front and back directions in FIG. 5, left and right directions in FIG. 6). And this casing 7
Is surrounded by a box-shaped bracket 8. The axle 1 is
It is welded to this bracket 8.

The equalizer beam 2 has the opening 9 of the bracket 8.
Is loosely inserted into. A support shaft 10 is bridged between the both side plates constituting the bracket 8. A sliding piece 11 having an outer peripheral surface having a spherical convex surface is externally fitted and fixed to an intermediate portion of the support shaft 10. Then, the spherical seat 13 is fitted on the sliding piece 11. The inner peripheral surface of the spherical seat 13 forms a spherical concave surface that is slidable with the spherical convex surface. The spherical seat 13 is fitted into the casing 7 and further the stop ring 1
It is designed to prevent it from coming off by 2 and 12.

A bellows-shaped boot (14) is provided between the equalizer beam (2) and the bracket (8) so as to be stretched between the two members (2, 8). The boot 14 closes the opening 9 of the bracket 8 to protect the sliding portion between the sliding piece 11 and the spherical seat 13 existing in the bracket 8 from dust. Band-shaped steel plates 15 and 16 are interposed between the inner peripheral surfaces of both ends of the boot 14 and the outer peripheral surfaces of the equalizer beam 2 and the bracket 8 to improve the adhesion between these peripheral surfaces. Further, steel band-shaped bands 17, 17 are fastened to the outer peripheral surfaces of both ends of the boot 14.

(Problems to be solved by the invention) However, in the case of the conventional equalizer beam dustproof device configured and operating as described above, a large boot having a complicated shape is used.
Since 14 is used, the production cost is unavoidable. or,
Outer peripheral surfaces of the equalizer beam 2 and the bracket 8 and boots
The work of winding the strip-shaped steel plates 15 and 16 in order to improve the adhesion to the inner peripheral surfaces of both ends of 14 is troublesome, which also causes an increase in manufacturing cost. The dustproof device for an equalizer beam of the present invention was devised in view of such circumstances.

(Means for Solving the Problem) A dustproof device for an equalizer beam according to the present invention includes an equalizer beam pivotally attached to a receiving portion of a vehicle body by a pivot, and a cylindrical casing fixed to an end portion of the equalizer beam,
A spherical seat provided on the inner peripheral surface of the casing, and a sliding piece having a spherical convex surface sliding on the spherical seat on the outer peripheral surface,
A support shaft having the sliding piece externally fitted and fixed to the outer peripheral surface of the intermediate portion, a pair of side plates each coupled to an axle and having the support shaft provided therebetween, and a material having flexibility. Are formed in a circular ring shape, and a pair of boots in which the portion between the inner peripheral edge and the outer peripheral edge is curved in a dish shape are formed on the outer peripheral surfaces of both ends of the casing, and the inner peripheral edge of each boot is formed on the inner side of each pair. It is composed of a fitted annular locking groove and a retaining ring that is fixed to the inner side surfaces of the side plates and holds the outer edge portions of the boots between the inner side surfaces of the side plates.

(Operation) According to the equalizer beam dustproof device of the present invention configured as described above, the space between the pair of side plates of the opening portions at both ends of the cylindrical casing is closed by the annular boots. Therefore, foreign matter such as dust and water does not enter the sliding portion between the spherical seat and the sliding piece that is present in the casing.

The ring-shaped boot is simpler in shape and smaller in size than the bellows-shaped boot that constitutes the conventional structure described above.
Therefore, the boots are easy to manufacture and inexpensive.
Further, since the labor of winding the steel plate as in the conventional structure is not required, the cost increase in this respect can be prevented.

Furthermore, by making the diameter of the boot sufficiently large, it becomes possible to secure a sufficient amount of deformation of the boot. Therefore, even when the relative displacement between the casing and the side plate is large, the seal between the casing and the side plate can be reliably achieved, and foreign matter can be reliably prevented from entering the sliding portion.

(Embodiment) FIGS. 1 to 3 show an embodiment of the present invention. The same parts as those of the conventional example shown in FIGS.

The shape and structure of the equalizer beam 2 and the casing 7 welded and fixed to both ends of the equalizer beam 2 are the same as those of the conventional structure described above. In the embodiment of the present invention shown in FIGS. 1 to 3, instead of the bracket 8 in the above-mentioned conventional structure, as shown in FIG. 1 pair of left and right side plates
I am using 8 and 18. The casing 7 is one of these
It is installed between the pair of side plates 18, 18.

Annular locking grooves 19 and 19 are formed on the outer surfaces of both ends of the casing 7, and the inner peripheral edges of the boots 20 and 20 are fitted and locked into the locking grooves 19 and 19, respectively. . Each of these boots 20, 20 is made of a flexible material such as rubber or synthetic resin, and is formed in an annular shape as a whole. Then, the portion between the inner peripheral edge and the outer peripheral edge is curved in a dish shape, and the relative displacement between the inner peripheral edge position and the outer peripheral edge position can be compensated based on the elastic deformation of the portion between these.

Furthermore, the outer edges of the boots 20, 20 are the side plates 18,
The inner surface of 18 is clamped by retaining rings 22 and 22. Each of these retaining rings 22, 22 is composed of two split elements, and is fixed to the inner surface of each of the side plates 18, 18 by bolts 21, 21 in a state where the two split elements are combined in an annular shape. The outer peripheral edges of the boots 20, 20 are held down. Reinforcing plates 23, 24 are welded between the pair of side plates 18, 18 as shown in FIG.

According to the equalizer beam dustproof device of the present invention having the above-described configuration, the opening portions at both ends of the cylindrical casing 7 and
The space between the pair of side plates 18 and 18 is completely closed by boots 20 and 20 which are made of a flexible material in a ring shape. Therefore, it is possible to reliably prevent foreign matter such as dust or water from entering the sliding portion between the inner peripheral surface of the spherical seat 13 and the outer peripheral surface of the sliding piece 11 existing in the casing 7.

Further, the ring-shaped boots 20, 20 are simpler in shape and smaller in size than the bellows-shaped boot 14 constituting the conventional structure described above. Therefore, the boots 20 and 20 can be manufactured easily and at a low price. Further, since the labor of winding the steel plate as in the conventional structure is not required, the cost increase in this respect can be prevented.

Further, the retaining rings 22, 22 for retaining the outer peripheral edge of the boots 20, 20 on the inner side surfaces of the side plates 18, 18 are a combination of two split elements. The work of attaching / detaching to / from a predetermined position on the inner surface of each of the side plates 18, 18 can be easily performed even after the support shaft 10 is hung between the side plates 18, 18.

Further, by making the diameter of each of the boots 20, 20 sufficiently large, it becomes possible to secure a sufficient amount of elastic deformation of each of the boots 20, 20. Therefore, even when the relative displacement between the casing 7 and the side plates 18 and 18 is large, the seal between the casing 7 and the side plates 18 and 18 is reliably achieved,
It is possible to reliably prevent foreign matter from entering the sliding portion between the inner peripheral surface of the spherical seat 13 and the outer peripheral surface of the sliding piece 11.

(Effects of the Invention) The dustproof device for an equalizer beam according to the present invention is constructed and operates as described above, and therefore, although it can be manufactured at low cost, foreign matter can enter the sliding portion provided in the casing. You can surely prevent it. Therefore, it is possible to inexpensively provide a suspension device for a large vehicle that is excellent in durability and reliability.

[Brief description of drawings]

1 is a side view of an end portion of an equalizer beam showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, FIG. 3 is a perspective view of the end portion of the equalizer beam, and FIGS. Is 1 of the conventional structure
An example is shown, FIG. 4 is a side view showing the entire equalizer beam, and FIG. 5 is a longitudinal sectional view of the end of the equalizer beam.
FIG. 6 is a sectional view taken along line BB in FIG. 5, and FIG. 7 is a perspective view of an end portion of the equalizer beam. 1: Axle, 2: Equalizer beam, 3: Car body, 4: Receiving part, 5: Axis, 6: Wheel, 7: Casing, 8: Bracket, 9: Opening, 1
0: Shaft shaft, 11: Sliding piece, 12: Stop ring, 13: Spherical seat, 14: Boot, 15, 16: Steel plate, 17: Strip band, 18: Side plate, 19: Locking groove, 20: Boot , 21: Bolt, 22: Retaining ring, 23, 24: Reinforcement plate.

Claims (1)

[Scope of utility model registration request] 1. An equalizer beam pivotally attached to a receiving portion of a vehicle body by a pivot, a cylindrical casing fixed to an end portion of the equalizer beam, and a spherical seat provided on an inner peripheral surface of the casing. A sliding piece having a spherical convex surface that slides on the spherical seat is formed on the outer peripheral surface, a support shaft having the sliding piece externally fitted and fixed on the outer peripheral surface of the intermediate portion, and each of the supporting shafts are coupled to an axle, and the above-mentioned members are interposed between them. A pair of side plates spanning support shafts, a pair of boots each formed of a flexible material in a circular ring shape, and a portion between an inner peripheral edge and an outer peripheral edge curved in a dish shape, and the above casing. Between the inner side surface of each of the side plates, which is fixed to the inner side surface of each of the side plates, which is formed on the outer peripheral surface of both ends of each of the boots and has the inner peripheral edge of each of the boots fitted therein. A pair of restraining rings that restrain the outer edge of each boot Dust-proof apparatus of the equalizer beam made of.