JP2543730B2 - 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 has an exhaust flow passage for exhaust gas flowing through the exhaust pipe during a steep slope. The present invention relates to an improvement of a slide type exhaust brake device which is closed to give a braking effect to a vehicle.

[Prior Art] Conventionally, as an exhaust brake device of this type, as illustrated in FIG. 10, a valve mechanism part is provided with a plate-like valve member (23) which is installed in a reciprocating operation path in a housing of a main body thereof. A block member (2) that engages with the valve member (23) by fixing an exhaust pressure adjusting hole (24) penetrating the valve member near the tip of the piston rod (26).
5) and an auxiliary valve member (27) by a liner (29) that rubs against the lower surface of the block member and lays on the facing surface of the valve member laid loosely (28). At the time of opening and closing, the tip end of the piston rod (26) and the wall surface of the block member (25) are impacted toward the valve member (23) side, and are pressed downward and pulled up by engagement.

[Problems to be Solved by the Invention] However, in the conventional valve mechanism, the exhaust pressure adjusting hole (24) is associated with the size of the valve member (23) in a limited space in the design. Since the effective passage area of the exhaust gas cannot be made large due to the restriction of the exhaust gas, the exhaust pressure adjusting hole (24), which is opened prior to the opening, does not have a sufficient exhaust pressure drop. Also, due to the loose attachment (28) to the block member (25) and the laying structure using the narrow liner (29), wear and backlash due to one-sided contact are likely to occur, and frequent opening and closing during use. The operation shortens the product life and causes a problem of lacking long-term serviceability.

In order to effectively solve the above-mentioned conventional problems, the present invention provides a valve member and an auxiliary valve member that form the valve mechanism portion, and the auxiliary valve member is opened to open the exhaust pressure adjusting hole. By having a holding means for forming a flow gap on the contact surface of, the effective passage area for the exhaust gas of the exhaust pressure adjusting hole is made large and a sufficient exhaust pressure drop is exerted to achieve the braking function. Sliding type exhaust brake that can be performed smoothly and quickly, and that the sufficient surface area in the moving direction of the auxiliary valve member eliminates the worry of wear and partial contact, prevents rattling, and is durable for a long period of time. The purpose is to propose a device.

[Means for Solving the Problems] The present invention relates to an exhaust brake main body in which a reciprocating operation path of a plate-shaped valve member is communicated with the exhaust flow passage, which is provided with projecting connecting walls to exhaust pipes at both end portions, in a direction substantially perpendicular to the exhaust flow passage. Inside the housing of the piston, the valve member having the exhaust pressure adjusting hole penetrating the surface thereof is internally mounted, and the valve member engaged with the tip end side of the piston rod penetrating the partition wall with the air cylinder device connected to the upper end of the reciprocating operation path. And an auxiliary valve member engaged with the valve member is attached near the tip of the piston rod, and when the valve member closes the exhaust flow passage, the auxiliary valve member closes the exhaust pressure adjusting hole and holds the tip of the piston rod. An exhaust brake device in which a valve member is pressed in one direction, an exhaust pressure adjusting hole is opened by the auxiliary valve member when the circuit is opened, and the auxiliary valve member engages with the valve member and moves in the other direction. Make up A slide having a structure in which the valve member and the auxiliary valve member have a holding means for forming a flow gap on the mutually contacting surfaces with the opening of the exhaust pressure adjusting hole by the auxiliary valve member at the time of the opening. In addition, the holding means comprises convex walls on both sides of the contact surface between the valve member and the auxiliary valve member near the exhaust pressure adjusting hole on the valve member side. The convex wall portion is configured to engage with the bottom wall surface on the auxiliary valve member side with the movement at the time of opening, or a protruding wall is provided in the substantially central portion of the contact surface on the auxiliary valve member side, and the protruding wall is provided. The part is configured to engage with the flat surface on the valve member side with the movement at the time of opening, or both end portions on the longitudinal side of the auxiliary valve member side are provided with bent end edges inclined in the distal direction, and The end edge portion is configured to engage with inclined wall portions provided in the widthwise left and right sides on the valve member side in the above direction.

[Embodiment] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of a slide type exhaust brake device of the present invention with a partial cutout, and FIG. FIG. 3 is an enlarged cross-sectional view of the valve mechanism portion according to the present invention in the open state due to a partial cutout, FIG. 3 is an explanatory view of the open state of FIG. 2, and FIG. 4 is of another embodiment. FIG. 3 is equivalent to FIG. 3, and FIG. 5 is a longitudinal cross-sectional view of a part of a notch near the valve mechanism showing another embodiment, and FIG.
The figure shows an enlarged side view of the valve mechanism of FIG.
FIG. 8 is an explanatory view of the opening of FIG. 6 and FIG. 8 is a plan view of the valve mechanism in a closed state when the valve member is formed by casting showing another embodiment, and FIG. Is A-A in FIG.
FIG. 1 is a cross-sectional view taken along a line, in which (1) is a reciprocal movement of a plate-like valve member (3) in a direction substantially perpendicular to an exhaust flow passage (2) in which connecting walls (1 ′) for connecting with an exhaust pipe are projectingly provided at both ends. A housing of an exhaust brake main body in which working paths communicate with each other, the valve member (3) internally provided in the reciprocating working path of the housing is provided with a discharge pressure adjusting hole (4) on its surface, and reciprocating operation is performed. A U-shaped groove is attached to the tip end side of a piston rod (6) penetrating a partition with an air cylinder device (5) connected to the upper end of the passage. Reference numeral (7) is an auxiliary valve member provided by being superposed on the valve member (3), and a block member (9) is interposed between the engaging portion of the piston rod (6) and the tip of the U-shaped member.
A groove portion, which closes the exhaust pressure adjusting hole (4) on the valve member (3) side when the valve is closed, and presses the valve member downward by the tip of the piston rod (6), It is configured to open the exhaust pressure adjusting hole (4) at the time of opening the circuit and to pull up the valve member by engaging with the valve member (3) at the engaging wall portion. (8) indicates that the valve member (3) and the auxiliary valve member (7) which form these valve mechanism parts are accompanied by the opening of the exhaust pressure adjusting hole (4) by the auxiliary valve member (7) when the circuit is opened. Is a flow gap formed on the mutually contacting surfaces by the holding means (10).

As the holding means (10), as shown in FIGS. 1 to 3, convex walls (11) are provided on both sides of the contact surface on the side of the valve member (3) near the exhaust pressure adjusting hole (4). The convex wall portion is provided so as to be engaged with the bottom wall surface of the auxiliary valve member (7) side as the convex wall portion moves during opening, or as shown in FIG. A projecting wall (12) is provided at approximately the center of the contact surface so that the projecting wall part is engaged with a flat surface on the valve member (3) side as the projecting wall moves during opening. As shown in FIG. 5 to FIG. 9, bent end edges (13) inclined toward the tip side are provided at both longitudinal end portions on the auxiliary valve member (7) side, and the end edges are provided on the valve member (3) side. The slanted wall (14) provided on the left and right sides in the same direction toward the same side is adapted to slide along with the movement at the time of opening.

[Operation] Since the present invention is configured in this way, when the valve member (3) closes the circuit, as shown in FIGS. 2, 6, 8, and 9, the valve member surface When the auxiliary valve member (7) is moved to close the exhaust pressure adjusting hole (4), the valve member (3) is pressed downward by the tip of the piston rod (6) to close the circuit. Sometimes,
Prior to this, as shown in FIG. 1, FIG. 3, FIG. 4, FIG. 5 and FIG. 7, as the auxiliary valve member (7) opened the exhaust pressure adjusting hole (4), By the holding means (10), the flow gap (8) is formed between the mutually facing surfaces, and the valve member (3) is pulled up by the engagement with the valve member at the engaging wall portion. The effective passage area for the exhaust gas of the exhaust pressure adjusting hole (4) due to the formation of the flow gap (8) by the holding means (10) associated with the opening of the exhaust pressure adjusting hole (4) in various operating states. Can have a large area, and exhaust gas can be effectively released through the flow gap.

[Advantages of the Invention] As described above, the slide type exhaust brake device according to the present invention forms the flow gap (8) by the holding means (10) associated with the opening, especially at the time of opening.
Even if the size of the valve member (3) is limited, the effective passage area of the exhaust pressure adjusting hole (4) for exhaust gas can be easily increased to a large area. Since a sufficient exhaust pressure drop is exhibited, the braking function can be performed smoothly and quickly, and the sufficient surface area in the movable direction of the auxiliary valve member (7) eliminates the fear of wear and partial contact. It is a very useful slide type exhaust brake device that can prevent backlash and can be used for a long period of time.

[Brief description of drawings]

FIG. 1 is a plan view of a slide type exhaust brake device showing an embodiment of the present invention with a partial cutout, and FIG. 2 is a partial cutout of a valve mechanism portion according to the essential part of the present invention in FIG. FIG. 3 is an enlarged sectional view in the closed state, FIG. 3 is an explanatory view of the opened state in FIG. 2,
FIG. 4 is a view corresponding to FIG. 3 of another embodiment, FIG. 5 is a vertical cross-sectional view of a part of a notch near the valve mechanism showing still another embodiment, and FIG. 6 is the valve of FIG. FIG. 7 is an enlarged side view of the mechanical portion in the closed state, FIG. 7 is an explanatory view of the opened state of FIG. 6, and FIG. 8 is a valve mechanism portion when a valve member is formed by casting showing another embodiment. FIG. 9 is a plan view of the closed hole state of FIG.
FIG. 10 is a vertical cross-sectional view of a part of a valve mechanism portion cut out, showing a conventional example. (3) …… Valve member, (4) …… Exhaust pressure adjusting hole, (7) ……
Auxiliary valve member, (8) ... flow gap, (10) ... holding means, (11) ... convex wall, (12) ... protruding wall, (13) ... edge, (14) ... inclination wall

Claims (4)

(57) [Claims] 1. An exhaust brake main body housing in which a reciprocating operation path of a plate-shaped valve member is communicated in a direction substantially perpendicular to an exhaust flow passage having projection walls provided with connecting walls for exhaust pipes at both end portions. The valve member having a pressure adjusting hole penetratingly mounted therein is attached to the tip end side of a piston rod that penetrates a partition with an air cylinder device continuously provided at the upper end of the reciprocating operation path, and the tip of the piston rod is further attached. An auxiliary valve member that engages with the valve member is attached to the vicinity of the valve member, and the valve member is placed in the closed path of the exhaust flow passage by the valve member to close the exhaust pressure adjusting hole by the auxiliary valve member and the valve member in one direction with the tip of the piston rod. In the exhaust brake device, the auxiliary valve member opens the exhaust pressure adjusting hole when the circuit is opened, and the auxiliary valve member engages with the valve member to move in the other direction. Member (3) and auxiliary valve The material (7) has a holding means (10) for forming a flow gap (8) on the mutually contacting surfaces with the opening of the exhaust pressure adjusting hole (4) by the auxiliary valve member at the time of the opening. A slide type exhaust brake device characterized in that 2. The exhaust pressure adjusting hole on the valve member side of the contact surface between the valve member (3) and the auxiliary valve member (7) according to claim 1, wherein: 4) A convex wall (11) is formed on both sides of the adjacent width, and the convex wall portion is configured to engage with the bottom wall surface on the side of the auxiliary valve member (7) along with the movement at the time of opening. Sliding exhaust brake device. 3. The holding means (10) according to claim 1, wherein the holding means (10) comprises a protruding wall (12) substantially at the center of the contact surface on the auxiliary valve member (7) side. Is configured to engage with a flat surface on the valve member (3) side as the valve moves when it is opened, a slide type exhaust brake device. 4. The holding means (10) according to claim 1, wherein the holding means (10) comprises a bent edge (13) inclined toward the tip end at both longitudinal end portions on the auxiliary valve member (7) side. A slide-type exhaust brake device characterized in that the end edge portion is configured to engage with the inclined wall (14) portions in the same direction provided on the widthwise left and right sides on the valve member (3) side.