JPH0768920B2 - Sliding exhaust brake device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention generally relates to a large vehicle such as a truck or a bus, which is connected in the middle of an exhaust pipe and blocks an exhaust gas exhaust flow passage at the time of a steep downhill. The present invention relates to an improvement of the structure of a slide type exhaust brake device, in particular, an auxiliary valve member, which exerts a braking function on a vehicle.

(Prior Art) Conventionally, the applicant of the present invention proposed a structure of an auxiliary valve member in an exhaust brake device of this type in Japanese Utility Model Laid-Open No. 56-65138, which will be described with reference to FIG. The auxiliary valve provided near the tip of the piston rod (16) of the air cylinder device with respect to the plate-like valve member (13) that is internally installed in the reciprocating operation path and that has the exhaust pressure adjusting hole (14) formed therethrough. The valve member (17) is composed of a flat plate liner (19) that rubs one surface of the valve member (13) side, and the block member (18) and the flat plate liner (18) laid with the flat plate liner (19). The concave groove (18 ') and the convex wall (19') formed on the mutually opposing surfaces of (19) are loosely engaged with each other.

(Problems to be Solved by the Invention) However, the auxiliary valve member (17) proposed in Japanese Utility Model Laid-Open No. 56-65138 has a valve member (13) in its design.
In connection with the limited size of the groove and the fact that the block member (18) must also be miniaturized for its smooth operation, the groove (18 ') and the convex wall (19'). Mutual loose-fitting engagement between the valve member (13) and the valve member (13) is required.
Of the block member (18) to the valve member (13) caused by the reciprocating operation of the above-mentioned high frequency, especially when the circuit is opened, "looseness" is generated in the loosely-engaging engagement portion after long-term use. , The "play" increases, and the flat liner (19) tilts in the front-rear direction to cause arcuate wear on the sliding surface during the reciprocating operation at the time of opening and closing, and therefore exhaust pressure adjustment in the closed state. There is a problem in that the closeness of the holes (14) is impaired, exhaust gas leakage is induced, and the braking function is deteriorated. Further, in connection with these problems, the block member (18) and the flat plate liner (19) need to be manufactured by precision casting including the concave groove (18 ') and the convex wall (19'), respectively, so that it is remarkably produced. It impeded sex.

The present invention solves the above-mentioned problems of the prior art, and in particular ensures mutual engagement in the depth direction (axial direction of the exhaust flow passage), and furthermore, by the impact of the block member on the valve member when the circuit is opened. The fatigue and "backlash" of the auxiliary valve member that occurs is reduced, the mechanical strength of the auxiliary valve member is improved, and the liner is prevented from slanting in the front-rear direction during reciprocating operation, thereby closing the circuit for a long time. Proposal of an exhaust brake device that can improve productivity by ensuring close contact with the exhaust pressure adjustment hole and maintaining good braking function, and by making it possible to easily manufacture the auxiliary valve member by pressing with a plate material The purpose is to do.

(Means for Solving the Problem) The present invention relates to an exhaust brake main body housing in which a reciprocating operation path of a valve member is made to communicate in a direction substantially perpendicular to an exhaust flow passage in which connecting walls for connecting to an exhaust pipe are projectingly provided at both end portions. A plate-shaped valve member having a discharge pressure adjusting hole penetrating therein is provided inside, and an auxiliary valve member is provided near the tip of the piston rod of the air cylinder device connected to the end of the reciprocating operation path through a block member. Is loosely engaged to engage with the valve member, and when the exhaust flow passage is closed by the valve member, the auxiliary pressure valve member closes the exhaust pressure adjusting hole and presses the valve member against the tip surface of the piston rod to open the one-way opening. At this time, in the exhaust brake device in which the exhaust valve adjusting hole is opened by the auxiliary valve member and the block member is engaged with the valve member to move together with the valve member, both ends of the auxiliary valve member are opposed to each other. Refraction to A support frame body having a substantially C-shaped cross section, and a plate shape having a U-shaped cross section having a bottom portion that is loosely fitted inside the support frame body to open and close the exhaust pressure adjusting hole of the valve member. The gist is a slide type exhaust brake device constituted by a liner, and further, the plate-shaped liner is configured such that both ends thereof extend outward in parallel to a bottom portion and have a pair of projecting portions.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.
1 is a partially cutaway longitudinal sectional view showing a slide type exhaust brake device of the present invention, FIG. 2 is a partially cut end view by enlarging line AA in FIG. 1, and FIG. 3 is another embodiment. 2 corresponding to FIG. 2 and FIG. 4 are partially cut-away end views by enlarging line BB in FIG. 1, (1) shows connecting walls (1 ') with exhaust pipes at both end portions, This is an exhaust brake main body housing in which a reciprocating operation path of a plate-like valve member (3) is made to communicate with the exhaust flow passage (2) protruding from (1 ') in a direction substantially perpendicular to the exhaust flow passage (2).
The exhaust valve adjusting hole (4) is provided through the valve member (3) installed inside the reciprocating working path of the, and the peripheral raised wall portion (3a) and the raised beam portion at the center (1) are formed on one side surface thereof. 3b) and the piston rod of the air cylinder device (5) that is connected to the end of the reciprocating working path.
A block member (10) is attached near the tip of (6), and when the block member is opened, the block member engages with a raised wall (3a) at the end of the valve member (3) on the side of the air cylinder device (5). When the front end surface of the piston rod (6) engages with the central beam portion (3b) of the valve member (3) during fitting and closing, the piston rod (6)
It is configured to move with.

(7) is an auxiliary valve member. The bottom surface (8a) of the auxiliary valve member is attached to the front surface of the block member (10) by the nut (11) near the tip of the piston rod (6) so that both ends (8b) face each other. A support frame (8) that is bent and has a substantially C-shaped cross-section, and is slidably inserted into the inside of the support frame to rub one side surface of the valve member (3) and also to the valve member. Exhaust pressure adjusting hole
And a plate-like liner (9) having a U-shaped cross section having a bottom (9a) for opening and closing (4).

Alternatively, both ends of the liner (9) may be extended outward in parallel with the bottom (9a) to provide a pair of protrusions (9b) as shown in FIG.

(Operation) The present invention, in the above-described structure, has a valve member.
When closing the circuit by (3), first, the air cylinder device
(5) is operated to move the piston rod (6) until the tip surface of the piston rod (6) contacts the central beam portion (3b) of the valve member (3), and the liner (9) in the auxiliary valve member (7) is moved. ) Bottom part (9a) closes the exhaust pressure adjusting hole (4) tightly by the pressure of the exhaust gas, and the valve member (3) moves the exhaust flow passage (2) as the piston rod (6) moves further. The whole circuit will be closed. On the other hand, when opening the circuit, when the piston rod (6) is moved by the coil spring so as to return to the old position by releasing the pressurized air in the air cylinder device (5), the block member (10) first causes the valve member (3) to move. ) Is moved until it impacts the raised wall (3a) at one end of
Open hole (4). In this state, since the exhaust pressure adjusting hole (4) is open, the pressure of the exhaust gas applied to the entire surface of the valve member (3) is released through the exhaust pressure adjusting hole (4). 3) can move smoothly with the movement of the piston rod (6).

In this way, the support frame body is bent so that both ends (8b) face each other and the auxiliary valve member (7) has a substantially C-shaped section.
(8) and a plate-shaped U-shaped section having a bottom portion (9a) that is loosely fitted inside the support frame and that opens and closes the exhaust pressure adjusting hole (4) of the valve member (3) The auxiliary valve member (7) is composed of a liner (9), and the bottom surface (8a) of the auxiliary valve member (7) is attached by a nut (11) to the front surface of the block member (10) that impact-engages with the valve member (3). The structure reduces fatigue and "backlash" in the auxiliary valve member (3) that occurs during impact engagement, and therefore the sliding surface of the liner (9) during reciprocating operation does not tilt in the front-back direction and the entire sliding surface It can be performed in a stable state. Further, the fitting structure also improves the mechanical strength of the auxiliary valve member (7).

(Effects of the Invention) As described above, in the slide type exhaust brake device of the present invention, in particular, the auxiliary valve member (7) is bent so that both ends (8b) thereof face each other and has a substantially C-shaped cross section. Support frame
(8) and a plate-like liner (9) having a U-shaped cross section having a bottom portion (9a) which is loosely fitted inside the support frame and opens and closes the exhaust pressure adjusting hole (4) of the valve member (3). And a block member (1) in which the auxiliary valve member (7) is shock-engaged with the valve member (3).
The bottom surface (8a) is attached to the front surface of (0) by the nut (11), so that the valve member (3) of the liner (9) during its reciprocating operation has a simple structure. In connection with stable sliding on one side of the side, the close contact in the exhaust pressure adjusting hole (4) at the time of closing is extremely reliable and the braking function can be effectively exerted for a long period of time. This is useful because the valve member (7) can be manufactured very easily by press working with a plate material and productivity can be improved.

[Brief description of drawings]

FIG. 1 is a partially cutaway vertical sectional view of a slide type exhaust brake device showing an embodiment of the present invention, and FIG. 2 is a partially cut end view by enlarging a main part of FIG. FIG. 3 is a view corresponding to FIG. 2 showing another embodiment, FIG. 4 is a partially cutaway end view by enlarging the same main portion of line BB in FIG. 1, and FIG. FIG. (3) …… Valve member, (6) …… Piston rod, (7) …… Auxiliary valve member, (8) …… Support frame, (8a) …… Both ends, (9) …… Liner, ( 9a) …… Bottom, (9b) …… Projection, (10) ……
Block member.

Claims (2)

[Claims] 1. An exhaust pressure adjusting hole is provided in an exhaust brake main body housing in which a reciprocating operation path of a valve member is made to communicate with the exhaust flow passage, which has projection walls provided with connecting walls for exhaust pipes at both end portions. The auxiliary valve member is loosely attached via a block member near the tip end of the piston rod of the air cylinder device that is internally provided with a plate-shaped valve member that is penetrated and that is connected to the end of the reciprocating operation path. When the exhaust flow passage is closed by the valve member, the exhaust valve adjusting hole is closed by the auxiliary valve member and the valve member is pressed by the tip end surface of the piston rod, while the exhaust valve is adjusted by the auxiliary valve member when opening. In an exhaust brake device in which a hole is opened and the block member engages with the valve member and moves together with the valve member, the auxiliary valve member (7) is bent so that both ends (8b) face each other. It has a substantially C-shaped cross section A U-shaped cross section having a supporting frame (8) to be presented and a bottom part (9a) which is loosely fitted inside the supporting frame and opens and closes the exhaust pressure adjusting hole (4) of the valve member (3). And a plate-shaped liner (9). 2. The plate-shaped liner (9) is configured such that both ends thereof extend outward in parallel to the bottom (9a) and have a pair of protrusions (9b). A slide type exhaust brake device according to the first section.