JPS6146193Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is generally used in large vehicles such as trucks or buses to provide a braking effect to the vehicle by connecting it to the middle of the exhaust pipe and closing the exhaust gas discharge path when the vehicle goes down a steep slope. This invention relates to an improvement in the structure of an exhaust brake device.

As shown in FIG. 4, the conventional sliding type exhaust brake device has a parting wall 16 around the circumferential surface 16' of the hole that contacts the piston rod 17.
Since the bearing 18 and the sealing member 19 are provided, a part of the exhaust gas, which normally has an exhaust pressure of around 5 kg/cm ² , is released from the mutual sliding surface, especially when braking is performed by closing the flow hole. Carbon and heat carried by the exhaust gas and abrasion metal powder generated as the valve member reciprocates enters and conducts the bearing 18 and the seal member 19. , the piston rod 17 or the piston packing material, etc. are significantly aged, worn, damaged, etc., and the function is to prevent dust, moisture, moisture, etc. from entering the cylinder from the bottom exhaust hole, and from entering the outside from the exhaust hole. Since the braking function deteriorates early due to the lack of a cleaning function through forced discharge, there is a need for improvement.

An object of the present invention is to provide a sliding type exhaust brake device that can solve the above-mentioned problems very effectively.

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3. A housing 1 as a brake body has a connecting wall 1' with an exhaust pipe on the outside of the shaft center,
It has a valve member operation storage chamber that communicates with an internal exhaust gas flow hole 3 with a protruding diameter of 1" and extends in a substantially perpendicular direction. Air cylinder device 2 installed on
It protrudes through the dividing wall section 6 at the mutual attachment point with the air cylinder device, and is engaged 5 with the protruding end of the piston rod 10 on the side of the air cylinder device. A quick supply/exhaust valve device 7 is provided at the top of the outside of the air cylinder device 2.
is attached, and a bearing 8 and a sealing material 9 are provided on the peripheral surface 6' of the hole in contact with the piston rod in the supporting wall portion 6 through which the piston rod 10 passes. In the air cylinder device, the valve member 4 is lowered by air supplied from the valve device 7 and raised by the return spring 11, which is similar to the known technology. An annular fumarole groove chamber 13 communicating with the air supply hole 14 is provided around the contact hole circumferential surface 6' in the dividing wall portion 6,
In order to connect and communicate the air supply hole 14 with an external air supply source such as a compressor, a piping 15 is provided as a fume supply path, so that the fume is constantly supplied during driving at a pressure higher than the exhaust pressure that the valve member 4 receives during braking. This is a system that forces fume into the air from a groove chamber. In addition, Figures 2 and 3
The solid line arrows in the figure indicate the direction of the flow of the jet in the pipe 15.

As described above, according to the present invention, the fume groove chamber 13 communicating with the air supply hole 14 is provided around the contact hole circumferential surface 6' of the partition wall 6, and the air supply hole 14 is further connected to the air supply hole 14 by an external compressor or the like. Since the air source is connected and communicated with the piping 15 and is configured to continuously emit air from the ejection groove chamber 13 during running, the mutual sliding gap between the bearing 8, the sealing material 9, and the piston rod 10 is caused by the effect of this ejection pressure. It is possible to effectively prevent carbon heat carried by exhaust gas or abrasion metal powder generated as a result of reciprocating movement of the valve member 4 from entering and being conducted from the bearing 8 to the inside of the air cylinder device 2.
It is possible to reduce aging, wear, damage, etc. on the sealing material 9, piston rod 10, piston packing material, etc., and the pressure of the jet that has flowed into the inside of the cylinder device 2 after the jet is released from the bottom exhaust vent 12. It can be used for a long time because it prevents dust, moisture, water, etc. from entering the cylinder, and at the same time performs a cleaning function by forcibly discharging it to the outside from the exhaust vent 12. .

[Brief explanation of drawings]

FIG. 1 is a side view of a sliding exhaust brake device according to an embodiment of the present invention, and FIG.
3 is a partially cutaway sectional view showing the main part of another embodiment of the present invention, and FIG. 4 is a partially cutaway sectional view showing a conventional example for comparison with the main part of the present invention. FIG. 6... Support initial wall part, 6'... Circumferential surface of opposing hole, 10...
... Piston rod, 12 ... Discharge vent, 13 ... Fumarole groove chamber, 14 ... Air supply hole, 15 ... Piping.

Claims (1)

[Scope of utility model registration request] The storage part of the housing has a connecting wall with an exhaust pipe protruding from the outside of the axis, communicates with the internal exhaust gas flow hole, and has an operation storage chamber for the valve member in a substantially perpendicular direction.
A plate-shaped valve member is attached to a protruding end of a piston rod on the air cylinder device side that protrudes through the dividing wall at the attachment point to the air cylinder device attached to the end periphery of the storage chamber side. In an exhaust brake device that is installed inside and opens and closes a flow hole of a valve member by reciprocating movement of a piston rod,
An annular jet groove chamber communicating with the air supply hole is provided on the circumferential surface of the hole in contact with the piston rod in the branching wall through which the piston rod passes, and further, the air supply hole and an air supply source consisting of an external compressor are connected to supply the air jet. A slide type exhaust brake device characterized in that it is configured by connecting and communicating with piping as a passageway.