JPH0247346Y2 - - Google Patents

Description

[Detailed explanation of the invention] a. Purpose of the invention (industrial field of application) The three-way joint according to this invention is designed to branch fluid sent from one pipe into two pipes. For example, it is used by being incorporated into the piping of a two-leading type drum brake.

(Prior Art) As a drum brake used for braking an automobile, a two-leading type drum brake as shown in FIG. 4 is used.

This two-leading type drum brake is provided with a pair of foil cylinders 3, 3 for driving a pair of brake shoes 2, 2 provided inside a drum 1 that rotates together with the wheels. In this way, the two-leading type drum brake with two foil cylinders 3, 3 can obtain a large braking force due to the strong servo effect, so it is used even though the production cost is higher than drum brakes with other structures. There are many opportunities to be

By the way, in the case of such a two-leading type drum brake, as shown in FIG. 4, there is one oil pipe 4 leading to the master cylinder, two branch oil pipes 5 leading to each foil cylinder 3, 5 must be connected to each other.

For this reason, conventionally, a three-way joint 6 as shown in FIGS.
I was trying to connect it with This conventional branch oil pipe 6 is made integrally by machining or casting metal, and has a three-way joint 6.
A base part 9 having a screw hole 8 for screwing a screw (not shown) inserted into a mounting hole formed in the back plate 7 (Fig. 4) to be provided with, and an oil passage through which pressurized oil flows inside. T-shaped tube section 11 having 10
It is composed of. The oil passage 10 opens at three end faces of the pipe portion 11, and each opening serves as a connection portion for connecting the end of either of the oil feed pipes 4, 5.

(Problems to be Solved by the Invention) However, when the conventional three-way joint 6 configured as described above is used for piping of a two-leading type drum brake, the following problems occur.

That is, the conventional three-way joint 6 is integrally formed, and there is no degree of freedom in the positional relationship between the connecting parts that connect the ends of the oil pipes 4 and 5, so it is difficult to connect the oil pipes to each other. In many cases, one of the oil pipes is connected in an elastically deformed state. If the oil pipe is connected in this deformed state, residual stress will be generated inside the oil pipe, and this residual stress and the vibration of the back plate 7 that occurs when the vehicle is braking will cause cracks in the oil pipe. It is more likely to occur.

In order to solve the above-mentioned problems, the three-way joint of the present invention has a certain degree of freedom in the positional relationship between the connecting parts, and also prevents the vibration of the back plate, etc., to which the three-way joint is attached, to the end of the oil pipe, etc. This prevents the signal from being transmitted to the connecting part for connecting the parts.

b. Structure of the invention (means for solving the problem) The three-way joint of the invention is composed of four types of members: a base, a joint pipe, a buffer material, and a leaf spring.

The base is fixed to the part where the three-way joint is to be attached, and is provided with a U-shaped receiving groove.

Next, in the joint pipe, a branch pipe part is branched from the side surface of the middle part of the straight pipe part whose both ends are fitted into the U-shaped receiving groove formed in the base, and both end faces of the straight pipe part are inserted into the joint pipe. The branch pipe portions each have a flow path that opens at the end face and communicates with each other.

The buffer material is attached to the outer peripheral surface of both ends of the straight pipe section of the joint pipe, and is interposed between the outer peripheral surface of the straight pipe section and the inner surface of the receiving groove.

Furthermore, the leaf spring is fixed to the base,
It has a function of pressing the straight pipe portion of the joint pipe into which the cushioning material is fitted toward the inner part of the U-shaped receiving groove.

(Function) The three-way joint of the present invention, configured as described above, is fixed to the back plate of a drum brake, etc., in the same way as the conventional three-way joint described above, and is connected to the fluid sent from one pipe. The joint pipe is used to branch into two pipes and flow, but the joint pipe is rotatable around the straight pipe part of the joint pipe relative to the base, and the joint pipe is not axially connected to the base. Since it can be slightly displaced in the direction, the three pipes whose respective ends are connected to this joint pipe can be connected with minimal deformation.

Also, since there is a buffer material between the base and the connecting pipe, even if vibrations from the back plate etc. are transmitted to the base, this vibration will not be transmitted directly to the joint pipe that connects the three pipes. There is no

(Example) Next, the present invention will be explained in more detail by explaining the illustrated embodiment.

Figures 1 to 3 show an embodiment of the present invention; Figure 1 is an exploded perspective view, Figure 2 is a front view showing the assembled state, and Figure 3 is a side view seen from the right side of Figure 2. It is a diagram.

A base 12 for configuring the three-way joint of the present invention,
4 of the joint pipe 13, the buffer material 14, and the leaf spring 15
A screw hole 16 for screwing a mounting bolt is formed on the back surface of the base 12, which is fixed to the part where the three-way joint is to be attached, among the various members, and on both ends of the upper surface, Each U-shaped receiving groove 17
Vertical walls 18, 18 are provided.

On the other hand, the joint pipe 13 has U-shaped receiving grooves 17, 17 formed in the vertical walls 18, 18 provided on the base 12.
A branch pipe part 20 is branched from the side surface of the middle part of the straight pipe part 19, whose both ends can be loosely fitted inside. Inside the joint pipe 13 consisting of the straight pipe part 19 and the branch pipe part 20, both end surfaces of the straight pipe part 19 and the branch pipe part 2 are provided.
A flow path 21 is provided which opens at each end face of the straight pipe part 19 and the branch pipe part 20 and communicates with each other just inside the branch part between the straight pipe part 19 and the branch pipe part 20.

Straight pipe portion 19 of the joint pipe 13 configured as described above
Cushioning materials 14, 14 attached to the outer peripheral surface of both ends of
The straight pipe part 19 is made of an elastic material such as urethane.
It is formed into a short cylindrical shape that can be fitted onto the outer peripheral surface of the holder without wobbling. These cushioning materials 14, 14 are designed to connect the inner surfaces of the receiving grooves 17, 17 of the base 12 and the outer circumferential surface of the straight pipe portion 19 when the three-way joint of the present invention is assembled as shown in FIGS. It functions to prevent the vibration of the base 12 from being transmitted to the joint pipe 13.

The L-shaped leaf springs 15, 15 are fixed to the rear surface of the base 12 by small screws 22, respectively.
Both ends of the straight pipe portion 19 of the joint pipe 13 fitted with the cushioning materials 14, 14 are
7 to prevent the straight pipe portion 19 from slipping out from the receiving grooves 17, 17.

In the three-way joint of the present invention constructed as described above, the joint pipe 13 is rotatable with respect to the base 12 in the direction of arrow A in FIG. When it is fixed to the back plate of a two-leading drum brake as shown in Figure 4 and used to branch the fluid sent from one oil feed pipe 4 into two oil feed pipes 5, 5. The three oil pipes 4 and 5 whose respective ends are connected to the joint pipe 13 can be connected without deforming any of them.

Additionally, a cushioning material 1 is provided between the base 12 and the joint pipe 13.
4 is present, even if the vibration of the back plate 7 is transmitted to the base 12, this vibration will not be directly transmitted to the joint pipe 13 to which the three oil feed pipes 4 and 5 are connected.

c. Effects of the invention Although the three-way joint of the invention is constructed and functions as described above, there is a certain degree of freedom in the positional relationship between the connecting parts of the three pipes, and during the connection work, the three-way joint of the invention has a certain degree of freedom. There is no need to deform the three-way joint, and due to the presence of the cushioning material, the vibrations of the back plate, etc. on which the base of the three-way joint is attached are not transmitted to the connection part for connecting the end of the oil pipe, etc. There is no risk of cracks occurring in any of the three pipes connected through the pipe.

[Brief explanation of drawings]

Figures 1 to 3 show an embodiment of the present invention; Figure 1 is an exploded perspective view, Figure 2 is a front view showing the assembled state, and Figure 3 is a side view seen from the right side of Figure 2. Figure 4 is a front view showing a two-leading type drum brake as an example of using a three-way joint;
FIG. 5 is a front view showing an example of a conventional three-way joint, and FIG. 6 is a side view seen from the right side of FIG. 1: Drum, 2: Brake shoe, 3: Wheel cylinder, 4: Oil pipe, 5: Branch oil pipe, 6: Three-way joint, 7: Back plate, 8: Screw hole, 9:
Base, 10: Oil passage, 11: Pipe, 12: Base,
13: Joint pipe, 14: Cushioning material, 15: Leaf spring, 1
6: Screw hole, 17: Receiving groove, 18: Vertical wall, 19: Straight pipe section, 20: Branch pipe section, 21: Channel, 22: Small screw.

Claims (1)

[Scope of utility model registration request] A base that can be freely fixed to the part where the three-way joint is to be attached, and a branch pipe part branched from the side of the middle part of the straight pipe part whose both ends are fitted into the U-shaped receiving groove formed on this base, A joint pipe that has a flow path therein that opens at both end faces of the pipe part and the end face of the branch pipe part and communicates with each other, and a joint pipe that is attached to the outer peripheral surface of both ends of the straight pipe part of the joint pipe and the outer peripheral surface of the straight pipe part. and an elastic buffer material interposed between the U and the inner surface of the receiving groove;
A three-way joint consisting of a leaf spring that presses toward the back of a letter-shaped receiving groove.