Metal working – Method of mechanical manufacture – Prime mover or fluid pump making
Reexamination Certificate
2000-12-20
2002-11-12
Cuda-Rosenbaum, I. (Department: 3726)
Metal working
Method of mechanical manufacture
Prime mover or fluid pump making
C029S897200, C029S525110
Reexamination Certificate
active
06477772
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to a method for mounting a load sensing proportioning valve assembly of an automobile, and particularly to a method for mounting a load sensing proportioning valve assembly of an automobile, which is capable of stabilizing the braking operation of the automobile by preventing a variation in the normal length of its elastic member and thus preventing imbalanced braking due to the early locking of the rear wheel side of the automobile regardless of a variation in load.
2. Description of the Prior Art
In general, a load sensing proportioning valve of an automobile is a valve that is capable of balancing the braking forces for front and rear wheels regardless of a variation in load.
The load sensing proportioning valve increases the oil pressure of the wheel cylinder of a rear wheel during braking in such a way that a lever is mounted to a plate spring between a master cylinder and the wheel cylinder of the rear wheel to sense the weight of an automobile.
FIG. 7
is a side view of a conventional load sensing proportioning valve assembly.
FIG. 8
is a front view of a conventional load sensing proportioning valve assembly.
FIG. 9
is a view showing the conventional load sensing proportioning valve assembly of
FIG. 8
seen in “C” direction.
FIG. 10
is a view showing the conventional load sensing proportioning valve assembly of
FIG. 7
seen in “D” direction.
The load sensing proportioning valve assembly
2
comprises a bracket
4
, a load bracket lever
6
, a proportioning valve
8
, a crank member
10
, a rod
12
and an elastic member
14
.
The bracket
4
is mounted to a rear chassis frame (not shown). The proportioning-valve
8
is mounted to the bracket
4
to be projected from the bracket
4
. The load bracket lever
6
is mounted to a portion of the bracket
4
.
The proportioning valve
8
is adapted to control the supply of oil to a rear side by the action of a stem (not shown) that is pushed by the load bracket lever
6
.
The crank member
10
is rotatably mounted to the proportioning valve
8
by means of a rotating shaft
15
. The crank member
10
is L-shaped, and is connected to the load bracket lever
6
by the elastic member
14
. The crank member
10
is provided with a curved slit
18
into which a bolt
16
is inserted to secure the rod
12
to the crank member
10
.
The rod
12
connects a rear axle housing (not shown) and the crank member
10
so as to transmit a variation in the load of a deck to the crank member
10
.
In the load sensing proportioning valve assembly constructed as described above, when a load is applied to the deck of a commercial vehicle due to freight loading, the crank member
10
is rotated around the rotating shaft
15
counterclockwise by the rod
12
connected to the rear axle housing.
When the crank member
10
is rotated counterclockwise, the elastic member
14
connected to the crank member
10
by a support rod
20
pulls the load bracket lever
6
while being extended.
Accordingly, the load bracket lever
6
is rotated around a hinge
22
and pushes the stem in the proportioning valve
8
, so that the pressure of brake oil supplied to the rear side is increased, thereby stabilizing a braking operation and preventing an imbalanced braking operation.
When the load having been applied to the deck is removed, a reversed operation is performed to allow the reduced pressure of brake oil to be applied to the rear side of the automobile.
In the meantime, in order to stabilize the braking operation without imbalance, the load sensing valve assembly should be precisely assembled.
To this end, the load sensing valve assembly is assembled using a mounting bracket
24
, a bolt
26
, a mounting pin
28
, and a band
30
. In particular, the load sensing valve assembly should be assembled without a variation in the elastic force of the elastic member
14
.
First step: the mounting bracket
24
in the form of a reversed triangle is attached to a portion of the crank member
10
while being erected.
Second step: the lower end of the mounting bracket
24
is inserted into a slit
32
provided in the mounting pin
28
.
Third step: the mounting pin
28
is inserted into the holder shaft
34
mounted to the crank member
10
while the lower end of the mounting bracket
24
is inserted into a slit
32
provided in the mounting pin
28
, and the band
30
is fitted into a fitting groove
36
.
Fourth step: after the rod
12
is mounted to the rear axle housing, the rod
12
is rotatably connected to the crank member
10
using the bolt
16
and the slit
18
in the crank member
10
.
Fifth step: the band
30
is cut.
Sixth step: assembly is finished by removing the mounting pin
28
from the older shaft
34
.
However, in the assembly of the conventional load sensing proportioning valve, there is a possibility in which the normal length L
1
of the elastic member
14
is changed when the rod
12
is connected to the crank member
10
using the bolt
16
.
Additionally, when the connecting bolt is fastened, the normal length L
1
of the elastic member
14
can be varied due to the gap between the mounting pin
28
and the mounting bracket
24
and the deformation of the band
30
, thereby deteriorating the performance of a braking operation.
Accordingly, the variation in the normal length of the elastic member causes the pressure of braking oil to be excessively increased, so that the early braking of the rear wheel side of the automobile is created, thereby generating the imbalanced braking operation of the automobile.
The number of parts to mount the load sensing proportioning valve assembly is excessively large, so that there occur shortcomings in which the mounting procedure of the assembly is complicated, the efficiency of the mounting of the assembly is reduced, and the mounting cost of the assembly is expensive.
SUMMARY OF THE INVENTION
Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a method for mounting a load sensing proportioning valve assembly of an automobile, which is capable of stabilizing the braking operation of the automobile by preventing a variation in the normal length of its elastic member and thus preventing imbalanced braking due to the early locking of the rear wheel side of the automobile regardless of a variation in load.
In order to accomplish the above object, the present invention provides a method for mounting a load sensing proportioning valve assembly of an automobile, comprising the steps of: securing the crank member of the assembly to a side of a rotating shaft, which rotatably attaches the crank member to the proportioning valve of the assembly, using a first connecting member having a first rotating direction; connecting a rod, which is connected to the rear axle housing of the automobile, to the crank member through a slit formed in the crank member using a second connecting member having a second rotating direction; and removing the first connecting member so as to allow the crank member to be rotated.
The first connecting member may be a left-handed bolt.
The second connecting member may be a right-handed bolt.
REFERENCES:
patent: 6032360 (2000-03-01), Bornhorst et al.
patent: 6217130 (2001-04-01), Engle
patent: 6305756 (2001-10-01), Scott et al.
patent: 2001/0039714 (2001-11-01), Lee
patent: 2001/0054841 (2001-12-01), Ross et al.
Birch & Stewart Kolasch & Birch, LLP
Cuda-Rosenbaum I.
Hyundai Motor Co.
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