JPH0538307U - Valve mechanism - Google Patents

Abstract

(57) [Summary] [Purpose] Scrap carbon devogit that is generated on the intake port side that is part of the valve mechanism and adheres to the back surface of the intake valve umbrella to prevent engine defects due to carbon devogit. [Structure] Intake port 8 connected to the combustion chamber 7 of the internal combustion engine
A rotary brush 9 which is rotated by the inflow pressure of the air-fuel mixture into the combustion chamber 7 is arranged inside the combustion chamber 7 and the umbrella back surface 2c of the intake valve 2 that periodically blocks the intake port 8.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a device for removing carbon devogit accumulated on the intake valve side in a valve train of an internal combustion engine.

[0002]

[Prior Art]

 As is well known, in the intake / exhaust port connected to the combustion chamber of an automobile engine, valves for partitioning the intake / exhaust port and the combustion chamber are respectively arranged to perform intake / exhaust operation in the combustion chamber. Of these valves, the carbon devodite is attached to the back surface of the valve on the intake port side (the valve head surface in the intake port) by the additives in the fuel being sucked in and the oil for valve lubrication, etc. It has been generated and accumulated.

[0003]

[Problems to be solved by the device]

 This carbon devogit is sponge-like and has good gasoline adsorbability and absorbs fuel in the air-fuel mixture, so the mixing ratio and other factors change. Therefore, problems such as deterioration of exhaust gas, reduction of engine output, and drivability at low temperatures will occur.

[0004]

[Means for Solving the Problems]

 Therefore, in the present invention, in the intake port connected to the combustion chamber of the internal combustion engine, a rotary brush that rotates due to the inflow pressure of the air-fuel mixture into the combustion chamber is installed on the back surface of the intake valve that periodically blocks the combustion chamber and the intake port. It was arranged so as to contact with.

[0005]

[Action]

 Since the brush that rotates due to the inflow pressure of the air-fuel mixture into the combustion chamber is placed inside the intake port so as to contact the back of the valve umbrella, the brush rotates every time intake operation occurs and the carbon devogit adheres to the back of the valve umbrella. Is prevented.

[0006]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a part of a cylinder head, and a valve mechanism is arranged in the cylinder head 1. The valve mechanism includes a valve 2, a valve spring 3, a rocker arm 4, a lash adjuster 5 and a camshaft 6. Then, the upper end of the stem 2a of the valve 2 is pressed by the cam shaft 6 via the rocker arm 4, so that the valve 2 projects into the combustion chamber 7 against the valve spring 3 and the intake and exhaust ports 8 are provided. Is opened and closed. (The figure shows the intake port side.) The intake side valve 2 (hereinafter referred to as "intake valve 2") that separates the intake port 8 from the combustion chamber 7 is used for additives in the intake fuel and valve lubrication. A rotating brush 9 is provided as a device for removing carbon devogit generated by oil and the like.

As shown in FIG. 2, the rotary brush 9 includes a base portion 9a rotatably supported by the valve stem 2a, a curved arm portion 9b extending from the base portion 9a, and a brush portion 9c formed on the curved arm portion 9b. And is rotated by the flow input of the air-fuel mixture sucked into the combustion chamber 7 through the intake port 8 shown in FIG.

The base portion 9a is a ball bearing, and the curved arm portion 9b has a side surface in a direction in which the side surface shape is in elastic contact with the outer shape of the valve 2 and, as shown in FIG. It is an arc-shaped metal piece. The brush portion 9c is a metal brush having a hardness lower than that of the material of the valve 2, and is provided between the umbrella back surface 2c of the valve 2 and the curved arm portion 9b, and gently contacts the umbrella back surface 2c by the elasticity of the bending arm portion 9b. is doing.

The rotating brush 9 has heat resistance to withstand the temperature around the valve, which is heated by combustion heat.

The rotary brush 9 configured as described above rotates in the direction of the arrow by the flow input of the air-fuel mixture that is sucked into the combustion chamber 7 from the intake port 8 during the intake stroke of the engine, and the rear surface 2 c of the valve 2 Scrap the carbon devogit attached to.

In the embodiments to be described below, members having the same operations as those described in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

A second embodiment of the present invention will be described with reference to FIG. In the second embodiment, the rotary brush 9 in the first embodiment is attached to the end portion of the valve guide 10 shown in FIG. 4 for supporting the intake valve 2 in a rotating manner. However, the same effect as that of the first embodiment can be obtained.

Next, FIGS. 5 and 6 show a third embodiment of the present invention. In FIG. 5, reference numeral 11 indicates a ring-shaped valve seat provided at the end of the intake port 8 located on the combustion chamber 7 side, and this valve seat 11 seals the combustion chamber as well as the port and the valve 2. Prevents uneven wear of the contact surface.

An annular groove 12 is provided on the inner peripheral surface 11 a of the valve seat 11, and a rotating brush 9 ′ that is a carbon devogit removing device is attached to the annular groove 12.

The brush 9'extends upward along the shape of the ring-shaped base 9'a and the base 2'a of the umbrella 2 of the valve 2 and faces the valve stem 2a as shown in FIG. It is composed of a curved arm portion 9'b that draws an arc and a brush portion 9'c that is provided inside the curved arm portion 9'b so as to come into contact with the umbrella back surface 2c. The same consideration is made.

The base portion 9′a is loosely fitted in the annular groove, and the curved arm portion 9′b is gently elastically deformed with respect to the umbrella rear surface 2c, so that the brush portion 9′c is attached to the umbrella rear surface 2c. Pushing against.

When the intake valve provided with the rotating brush 9 ′ configured as described above is operated, the airflow of the air-fuel mixture sucked into the combustion chamber 7 hits the curved arm portion 9 ′ more, and the base portion 9 ′ a has the annular groove 12 The brush 9'c moves inside the umbrella back surface 2c to scrape off carbon devogit by rotating the inside in the direction of the arrow.

[0018]

[Effect of the device]

 According to the present invention, the rotating brush is rotated by the flow of the air-fuel mixture into the combustion chamber to scrape off the carbon devogit adhering to the intake valve. Alternatively, the decrease in driver's ability at low temperatures can be resolved.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a valve operating mechanism to which a rotating brush according to a first embodiment of the present invention is attached.

FIG. 2 is a partially enlarged view of FIG. 1 showing a mounted state of the rotary brush of the first embodiment.

FIG. 3 is a cross-sectional view of FIG. 2A-A.

FIG. 4 is an enlarged view showing a second embodiment of the rotary brush of the present invention.

FIG. 5 is an enlarged view showing a mounting state of a rotary brush according to a third embodiment of the present invention.

6 is a cross-sectional view of FIG. 5B-B.

[Explanation of symbols]

 2 Intake valve 2c Umbrella back face 7 Combustion chamber 8 Intake port 9, 9'Rotary brush

Claims (1)

[Scope of utility model registration request] 1. A rotary brush, which is rotated by an inflow pressure of an air-fuel mixture into the combustion chamber, is provided in an intake port connected to a combustion chamber of an internal combustion engine on a back surface of an intake valve that periodically blocks the combustion chamber and the intake port. A valve mechanism that is arranged so as to be in contact with each other.