Usui Kokusai Sangyo Kaisha Limited

Usui Kokusai Sangyo Kabushiki Kaisha, Ltd.

Ryoichi Suzuki

Kazunori Takikawa

Kazunori Takigawa

There is disclosed an improved sliding exhaust brake system installed on a large vehicle. The brake system comprises a housing, an exhaust gas passage, a main valve member taking the form of a flat plate, one or more exhaust pressure-adjusting holes formed in the main valve member, an auxiliary valve member, and a holding mechanism. The main valve member engages the piston rod of an air cylinder device. The auxiliary valve member can move a given distance relative to the main valve member. When the exhaust gas passage is opened or closed by the main valve member, the auxiliary valve member opens or closes the adjusting holes. At this time, the holding mechanism temporarily prevents relative movement between the the two valve members.

Sliding exhaust brake system

There is disclosed an improved sliding exhaust brake system installed on a large vehicle. The brake system comprises a housing, an exhaust gas passage, a main valve member taking the form of a flat plate, an exhaust pressure-adjusting hole formed in the main valve member, a block member fixed to the front end of a piston rod, and a piston valve mechanism for opening and closing the exhaust pressure-adjusting hole. When the passage is closed by the main valve member, it is pushed in one direction by the front end of the piston rod. When the passage is opened, the block member engages the main valve member to move it in the opposite direction. The piston valve mechanism is biased forward by a spring.

There is disclosed a slide type exhaust brake system including a housing accommodating a valve member formed with an exhaust pressure adjusting hole, and a piston rod to which an auxiliary valve member composed of a support frame member assuming a substantially C-shape in section and a liner member is locked. The liner member has its upwardly bent walls at both ends in the longitudinal direction and assumes a cross-like shape adaptive to be sustained by a pair of sustaining walls protruded from both sides of the valve member and fitted in inclined induction slots formed in the support frame member. The liner member closes the exhaust pressure adjusting hole when closing an exhaust passageway by the valve member which is simultaneously thrust in one direction. When opening the exhaust passageway, the liner member opens the adjusting hole, while the valve member is moved in the other direction. The liner member is also formed with at least one exhaust gas escape hole for preventing an excessive load to exhibit the Venturi effect when closing the adjusting hole.

Slide type exhaust brake system

A slide type exhaust brake having an exhaust pressure regulating passage provided in that portion of the wall of a housing which defines the bottom of a guide passage for a reciprocating valve member such that the exhaust pressure regulating passage extends from the surface of the bottom wall to an exhaust gas flow passage at the downstream side of the valve member when disposed to close the flow passage. The inlet of the exhaust pressure regulating passage is opened or closed by an exhaust pressure regulating valve provided at the distal end of a piston rod of an air cylinder, the piston rod having the valve member movably engaged therewith, in response to the operation of the valve member for opening or closing the flow passage. By virtue of the above-described arrangement, the presence of the exhaust pressure regulating passage has no effect on the mechanical strength of the valve member, and since the inlet of the exhaust pressure regulating passage is opened or closed by the axial movement of the exhaust pressure regulating valve provided at the distal end of the piston rod, there is no fear of wear. Accordingly, it is possible to ensure the tight seal of the inlet of the exhaust pressure regulating passage when the flow passage is closed. Thus, it is possible to effectively maintain the braking function for a long period of time.

Slide type exhaust brake

A sliding exhaust brake system installed on a large-sized vehicle. The system comprises a main valve member for opening and closing an exhaust passage and an auxiliary valve mechanism. The auxiliary valve mechanism consists of a support frame of a substantially C-shaped cross section and a liner mounted inside the frame. The liner has tonguelike portions at its both side ends. The tonguelike portions extend under the support frame.

There is disclosed a slide type exhaust brake system including a housing accommodating a valve member formed with a plurality of exhaust pressure adjusting holes and having its intermediate beam wall formed with an exhaust pressure escape hole, and a piston rod to which an auxiliary valve mechanism composed of a support frame and a liner is locked. The end portions, bent upwards, of the liner are laid along the peripheral wall portions of the frame to prevent the exhaust gas from escaping from the adjusting holes, thereby eliminating an incipient delay in braking. The liner closes the exhaust pressure adjusting holes when closing an exhaust passageway by the valve member which is at the same time thrust forwards. When opening the exhaust passageway, the liner opens the adjusting holes, while the valve member is moved backwards. The liner surface is also formed with at least one through-hole. This arrangement is combined with an effect of enlarged area of the adjusting holes to cause a sufficient drop in exhaust pressure.

An exhaust brake unit comprises a case to be inserted into an exhaust gas line, a valve seat located inside the case so as to encircle an exhaust gas passage, a pair of cavities formed on opposite side walls along the exhaust gas passage, a pair of shafts mounted in the respective cavities, and a pair or swing flaps mounted on the respective shafts. Facing flaps open and close the exhaust gas passage through the action of being engaged with the valve seat and disengaged from it. The flaps are connected to an actuating means by way of a linking mechanism which can be variously modified. The flaps may have unequal areas and/or have a time lag between their opening movements to reduce the force and time required to open the flaps.

Exhaust brake unit equipped with a pair of swing flap valves

A sliding exhaust brake includes a housing of an exhaust brake body having an exhaust passage with an exhaust pipe provided projectingly on opposite end portions thereof. A platelike valve member with an exhaust pressure regulating hold perforated through its bottom wall surface is installed within a reciprocating way communicating with the exhaust passage. An air cylinder is provided on an upper side end portion of the reciprocating way, and an auxiliary valve member is fitted on a nose portion of a piston rod of the air cylinder passing through a dissepiment with the air cylinder. For closing the exhaust passage, the exhaust pressure regulating hole is closed by the auxiliary valve member from engaging end edge portions of salient walls provided on the nose portion of the auxiliary valve member with the platelike valve member intermediately thereof to push in one direction. For opening, the end edge portions are separated therefrom and slide on the surface of the platelike valve member to disclose the exhaust pressure regulating hole.

Sliding exhaust brake having main valve and auxiliary valve with flow

There is disclosed a slide type exhaust brake system having: an exhaust brake body orthogonal to an exhaust passageway provided with a protrudent connecting wall to an air release pipe; and air cylinder leading to one end of the brake body; a tabular valve member incorporated into a reciprocatory operation passageway and fitted to a tip of a piston rod penetrating a partition wall with respect to the air cylinder unit; a block member engaging with the valve member; and an exhaust pressure adjusting hole communicating with an engagement port. When closing the exhaust passageway, the exhaust pressure adjusting hole is closed substantially by the tip of the piston, keeping a minute spacing with respect to a peripheral surface of the engagement port. The peripheral surface of the exhaust pressure adjusting hole undergoes a unidirectional thrust by the piston tip. When opening the exhaust passageway, the exhaust pressure adjusting hole is opened substantally by the piston tip. The block member moves the valve member in the other direct. Thus the braking functions smoothly and rapidly.

A sliding exhaust brake system installed on a large-sized vehicle. The system comprises a reciprocating piston rod, an auxiliary valve member fixed to the rod, and a main valve member. The auxiliary valve member makes a sliding contact with the bottom wall of the main valve member. At least one holes extends through the auxiliary valve member. The main valve member is provided with plural exhaust pressure-adjusting holes. When the exhaust passage of the brake system is closed off, the auxiliary valve member closes all the exhaust pressure-adjusting holes.

Herein disclosed is a slide type exhaust brake system. In this system, a plate valve member having an exhaust pressure regulating port extending through its surface is fitted in an exhaust brake body housing having a valve member reciprocation passage extending generally at a right angle from and communicating with an exhaust flow passage having exhaust pipe joint walls projecting at its two side end portions. Moreover, a pressure regulating valve is so fastened to the leading end of the piston rod of an air cylinder mechanism extending from the end portion of the reciprocation passage as to engage with the valve member so that, upon closure of the exhaust flow passage by the valve member, the exhaust pressure regulating port is closed by the pressure regulating valve and the valve member is pushed by the leading end portion of the piston rod, whereas, upon opening of the exhaust flow passage, the exhaust pressure regulating port is opened by the pressure regulating valve and the pressure regulating valve comes into engagement with the valve member to pull up the same. The pressure regulating valve includes: a pressure regulating valve seal carrier having a generally C-shaped section and attached to the front face of a block member engaging with the valve member; and a pressure regulating valve seal fitted loosely in the seal carrier and sliding to fit closely on the abutting face of the seal carrier at the side of the valve member.

There is disclosed a slide-type exhaust braking system for applying a braking function to a vehicle by blockading a passageway for an exhaust gas. This system includes an exhaust pressure adjusting hole passageway disposed at a bottom wall portion of a reciprocation passageway of a valve member in a body housing so that the hole passageway leads to a rear passageway. The system further includes an auxiliary valve member disposed at the hole peripheral portion, this auxiliary valve member being biased by springs. The exhaust pressure adjusting hole passageway is closed by pressing the auxiliary valve member with the piston rod and is opened with an upward movement of the piston rod. Impulsive forces acting on the auxiliary valve member are absorbed by shock-absorbing means provided at the tip of the piston rod or by virtue of a double valve structure.

Slide-type exhaust braking system

Herein disclosed is a valve actuator which is to be used with a slide exhaust brake system. The valve actuator includes a cylinder casing which is constructed of: a shortened cylinder body having a length substantially equal to the sliding distance of a piston member fitted therein; and a cylindrical wall fixed on the inner side of the bottom wall of the cylinder body such that the cylinder body has its lower end merging around its circumference into the circumference of the upper end of the cylindrical wall. The heat to be transferred from the exhaust brake system to the actuator is effectively reduced by a thermal impulse at the fixing portion between the cylinder body and the cylindrical wall to exert less thermal influences upon the packing of the piston member. Moreover, the cylinder casing of the actuator can be formed simply by cutting an elongated cylinder member having its inner circumference subjected to a necessary treatment and by fixing the cut cylinder member to the cylindrical wall having its inner circumference left untreated.

Valve actuator for slide exhaust brake systems

A sliding exhaust gas brake connected in the exhaust pipe of an engine in a motor vehicle. It includes a housing having a portion defining an exhaust gas passage and connected to the exhaust pipe at both ends thereof and a portion connected to the exhaust gas passage substantially at right angles thereto and defining a chamber in which a valve member is slidably disposed. A valve actuator has one end connected to a housing wall defining the end of the chamber. The actuator includes a piston and a piston rod extending into the housing through the housing wall and having one end on which the valve member is supported. A partition is provided in the housing for dividing the chamber into a first portion in which the valve member is slidably disposed and a second portion into which the piston rod extends. The partition has an opening aligned with the exhaust gas passage. The opening has an edge defining a valve seat on which the valve member rests when closing the exhaust gas passage. The valve member is slidable on the partition and is received into the first portion of the chamber when opening the passage. The first portion of the chamber is fluidally connected with the exhaust gas passage upstream of the partition.

Growing community of inventors

Mishima, Japan

Ryoichi Suzuki