Spring devices – Vehicle – Leaf
Patent
1997-08-25
2000-06-20
Oberleitner, Robert J.
Spring devices
Vehicle
Leaf
267268, B60G 1112
Patent
active
060768150
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a sealed spring suspension for a vehicle, said spring suspension comprising a spring shackle bolt which is threaded in a spring bushing of a leaf spring and which is non-rotatably mounted in a mounting on the frame of the vehicle, the spring bushing being rotatable about the bolt depending on resilient movements of the spring supported by means of the bushing.
DESCRIPTION OF RELATED ART
Devices of the above mentioned type are previously known for suspension of a leaf spring in a spring anchorage and a spring shackle in a truck. Since each spring bushing during the resilient movements is rotated about the respective bolt up to 10.degree., the bushing and the bolt form together a threaded bearing lubricated with grease. In order to make the load-absorbing surface greater, the bearing surfaces are threaded in both the bushing and the bolt. This provides axial guidance between the parts as well.
Due to the fact that the spring suspension is placed so as to be subjected to dirt and water, and due to the relatively high load on the bearing surfaces, regular lubrication is required, which is made possible by means of a lubricating nipple arranged in each spring shackle bolt. For lubrication, grease is pressed out through two holes in the middle of the bolt forcing itself between the threads so that any water and dirt is pushed out and drained out at the end portions of the bolt. This has, however, proved insufficient for protecting the threads against corrosion and jamming.
According to a known solution, a first O-ring is therefore applied against a shoulder at one end of the bolt, and after inserting the bolt through the anchorage and the bushing, a second O-ring is applied to the other end of the bolt. When the bolt is tightened, the O-rings are compressed axially, the first between the shoulder of the bolt and the bushing, and the second between the sleeve and the spring bracket of the anchorage. An important precondition for achieving a satisfactory seal in the two O-rings is that the bushing be correctly mounted in the bracket with an equal gap at both ends, and this makes the mounting time-consuming, complicated and thus costly.
SUMMARY OF THE INVENTION
The purpose of the present invention is therefore to achieve in a simple manner a reliable spring suspension, which is easily assembled in a shorter period of time than previously and which has a more reliable seal than previous designs and which avoids improper installation.
This is achieved according to the invention by virtue of the fact that the bushing in each end portion is equipped with a seal which is in continuous sealing contact with the bolt regardless of the axial position of the bushing relative to the bolt and the anchorage. Advantageous improvements and further developments of the invention are disclosed in the subclaims.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described in more detail below with reference to the accompanying drawing.
FIG. 1 shows a device according to the invention longitudinal section with a spring shackle bolt screwed into a spring bushing provided with lip seals.
FIG. 2 shows a detail of the device shown in FIG. 1 on a larger scale.
FIG. 3 is a view of the device according to FIG. 1 in longitudinal section but which is rotated 90.degree. about the longitudinal axis and has oppositely facing seals.
FIG. 4 shows a detail of this alternative mounting of the lip seals in the device according to FIG. 3 on a larger scale.
FIG. 5 shows a partial view of a spring suspension with the spring shackle bolt within the spring bushing rotatably mounted in an anchorage of a vehicle frame.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
A grease-threaded bearing 1 for a vehicle spring suspension consists of a spring shackle bolt 2 and a spring bushing 4. The bolt 2 is a conventional design, which means that it is threaded and screwed for mounting into the corresponding thread of the bushing 4, which is in turn pressed into a spring hole in one end of the leaf spring
REFERENCES:
patent: 1992981 (1935-03-01), Zerk
patent: 2170455 (1939-08-01), Leighton
patent: 2251843 (1941-08-01), Jones
patent: 2333183 (1943-11-01), Jones
patent: 4003562 (1977-01-01), Kaiser et al.
patent: 4083545 (1978-04-01), Herbenar
patent: 4103932 (1978-08-01), Parker
patent: 4166628 (1979-09-01), Blaydon
patent: 5320432 (1994-06-01), Fox
AB Volvo
Oberleitner Robert J.
Williams Thomas J.
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