CN111397568A - Tool and method for detecting perpendicularity of guide rod of valve bridge - Google Patents

Abstract

The invention discloses a tool and a method for detecting perpendicularity of a valve bridge guide rod, which are applied to the valve bridge guide rod, wherein the valve bridge guide rod is arranged on a cylinder cover and comprises a guide sleeve, a sensor wire harness and a controller, the guide sleeve is sleeved on the valve bridge guide rod, the sensor is embedded in the bottom surface of the guide sleeve, the bottom surface of the guide sleeve and the sensor are both attached to the cylinder cover, and the sensor wire harness is respectively and electrically connected with the sensor and the controller. The valve bridge guide rod verticality detection device can accurately detect the verticality of the valve bridge guide rod, and is small in tool and simple and convenient to operate.

Description

Tool and method for detecting perpendicularity of guide rod of valve bridge

Technical Field

The invention relates to the technical field of engines, in particular to a tool and a method for detecting perpendicularity of a guide rod of a valve bridge.

Background

As shown in fig. 1, in the prior art, a valve bridge guide rod 1 is mounted on a cylinder cover 2, a valve bridge 7 is mounted on the valve bridge, and a rocker arm part 8 transmits force to a valve through the valve bridge 7, so that the effect of controlling the opening and closing of the valve is achieved.

However, the valve bridge guide rod is arranged on the cylinder cover and has the parameter requirement of verticality, if the verticality does not meet the parameter requirement, the position of the valve bridge can be deviated, so that when the rocker arm part acts on the valve bridge, the acting force can not be accurately transmitted to the valve, or the stress of the valve is uneven, and further the valve generates eccentric wear on a valve guide pipe and a valve seat ring in the working process. Once the valve seat ring is eccentrically worn, the engine has serious consequences such as insufficient power, ablation and cracking of the valve, abrasion of a stepped hole of a valve guide pipe and the like, and the dynamic property and the reliability of the engine are influenced. Therefore, after the valve bridge guide rod is arranged on the cylinder cover, the verticality of the valve bridge guide rod needs to be detected.

At present, a common method for detecting the verticality of a valve bridge guide rod is detection by a three-coordinate measuring machine, the three-coordinate measuring machine uses a measuring head probe, and the valve bridge guide rod arranged on a cylinder cover is subjected to contact measurement, so that the valve bridge guide rod is high-precision equipment.

The three-coordinate measuring machine is a high-precision device, has relatively high requirements on environment and certain requirements on the level of an operator, and is difficult to realize on an engine assembly line if the verticality of each valve bridge guide rod arranged on a cylinder cover is detected.

In summary, the detection of the perpendicularity of the guide rod of the valve bridge requires a portable, precise, simple and convenient tool for detection on the assembly line.

Disclosure of Invention

Aiming at the problems, the invention provides a tool and a method for detecting the perpendicularity of a valve bridge guide rod, which can accurately detect the perpendicularity of the valve bridge guide rod, and meanwhile, the tool is small and exquisite and is simple and convenient to operate.

The invention adopts the following technical scheme to realize the purpose:

the utility model provides a detect valve bridge guide bar straightness's instrument that hangs down, is applied to valve bridge guide bar, and valve bridge guide bar installs on the cylinder cap, including uide bushing, sensor pencil and controller, on the valve bridge guide bar was located to the uide bushing cover, the bottom surface of uide bushing was inlayed and is had the sensor, and the bottom surface of uide bushing and sensor all laminate with the cylinder cap, sensor pencil respectively electric connection sensor with the controller.

Preferably, the sensor is arranged in a ring shape, and at least two sensitive units are distributed on the sensor.

A detection method of a tool for detecting the verticality of a guide rod of an air valve bridge comprises the following steps,

step 1, sleeving a guide sleeve on a valve bridge guide rod, and simultaneously attaching the bottom surface of the valve bridge guide rod and a sensor to a cylinder cover;

step 2, a sensor detects the distance from the bottom surface of the valve bridge guide rod to the plane of the cylinder cover, and the detected information is transmitted to a controller through a sensor wire harness for calculation;

step 3, the specific calculation method is as follows: subtracting the minimum distance value from the maximum distance value sensed by the sensor to obtain the distance s, wherein the height of the guide sleeve is h, the diameter of the center line of the sensor is a, and the drawing requirement of the verticality of the valve bridge guide rod is that

According to

Calculated critical distance s1, expressed by the formula

To obtain

And 4, comparing the value s with the calculated value s1, wherein if s is greater than s1, the verticality is unqualified, and if s is less than s1, the verticality is qualified.

The invention has the beneficial effects that:

the tool and the method for detecting the perpendicularity of the valve bridge guide rod can accurately detect the perpendicularity of the valve bridge guide rod, are small and exquisite in tool and simple and convenient to operate, and can intuitively and quickly judge the qualification and the specific numerical value of the perpendicularity.

Drawings

FIG. 1 is a schematic view of a prior art valve bridge guide bar installation;

FIG. 2 is a schematic structural diagram of a tool for detecting perpendicularity of a guide rod of a valve bridge, provided by the invention;

fig. 3 is an installation schematic diagram of the tool for detecting the perpendicularity of the guide rod of the valve bridge provided by the invention.

Fig. 4 is a schematic structural diagram of a sensor in the tool for detecting the perpendicularity of the guide rod of the valve bridge provided by the invention.

In the figure, 1 is a valve bridge guide rod, 2 is a cylinder cover, 3 is a guide sleeve, 4 is a sensor, 5 is a sensor wiring harness, 6 is a sensitive unit, 7 is a valve bridge, and 8 is a rocker arm component.

Detailed Description

The present invention will be described in detail with reference to the accompanying fig. 2 to 4 and the embodiments.

Referring to fig. 2-4, the embodiment of the invention provides a tool for detecting perpendicularity of a valve bridge guide rod, which is applied to a valve bridge guide rod 1, wherein the valve bridge guide rod 1 is installed on a cylinder cover 2 and comprises a guide sleeve 3, a sensor 4, a sensor wire harness 5 and a controller, the guide sleeve 3 is sleeved on the valve bridge guide rod 1, the sensor 4 is embedded in the bottom surface of the guide sleeve 3, the bottom surface of the guide sleeve 3 and the sensor 4 are both attached to the cylinder cover 2, and the sensor wire harness 5 is respectively and electrically connected with the sensor 4 and the controller.

When the tool for detecting the perpendicularity of the valve bridge guide rod is used, the valve bridge guide rod 1 is arranged on the cylinder cover 2, the valve bridge guide rod 1 is sleeved with the guide sleeve 3, the bottom surface of the valve bridge guide rod 1 is attached to the cylinder cover 2, the sensor 4 positioned on the bottom surface of the guide sleeve 3 can sense the distance between the bottom surface of the valve bridge guide rod 1 and the plane of the cylinder cover 2, data are transmitted to the controller through the sensor wire harness 5, the perpendicularity calculated by the controller according to a formula can be read visually, and the calculated perpendicularity is compared with a qualified perpendicularity value, so that whether the measured perpendicularity is qualified is judged.

Furthermore, the sensor 4 is designed to be annular, and at least two sensing units 6 are distributed on the sensor 4 and used for sensing the distance between the bottom surface of the guide sleeve 3 and the plane of the cylinder cover 2. In the present embodiment, 16 sensing units 6 are provided to increase the accuracy of the measured value.

Furthermore, the diameter tolerance of the inner hole of the guide sleeve 3 is matched with the outer diameter tolerance of the valve bridge guide rod 1, so that the guide sleeve 3 is smoothly sleeved into the valve bridge guide rod 1, and the guide sleeve 3 and the valve bridge guide rod 1 cannot generate a gap influencing verticality due to the matching of the tolerances.

The detection method of the tool for detecting the perpendicularity of the guide rod of the valve bridge comprises the following steps,

step 1, sleeving a guide sleeve 3 on a valve bridge guide rod 1, and simultaneously attaching the bottom surface of the valve bridge guide rod 1 and a sensor 4 to a cylinder cover 2;

step 2, a sensor 4 detects the distance from the bottom surface of the valve bridge guide rod 1 to the plane of the cylinder cover 2, and the detected information is transmitted to a controller through a sensor wire harness 4 for calculation;

step 3, the specific calculation method is as follows: the distance s is obtained by subtracting the minimum distance value from the maximum distance value sensed by the sensor 4, the height of the guide sleeve 3 is h, the diameter of the center line of the sensor 4 is a, and the drawing requirement of the perpendicularity of the valve bridge guide rod 1 is that

According to

Calculated critical distance s1, expressed by the formula

To obtain

And 4, comparing the value s with the calculated value s1, wherein if s is greater than s1, the verticality is unqualified, and if s is less than s1, the verticality is qualified.

Although the invention has been described in detail above with reference to specific embodiments, it will be apparent to one skilled in the art that modifications or improvements may be made based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims (3)

1. The utility model provides a detect valve bridge guide bar straightness's instrument that hangs down, is applied to valve bridge guide bar (1), and install on cylinder cap (2) valve bridge guide bar (1), a serial communication port, including uide bushing (3), sensor (4), sensor pencil (5) and controller, on valve bridge guide bar (1) was located to uide bushing (3) cover, the bottom surface of uide bushing (3) was inlayed and is had sensor (4), and bottom surface and sensor (4) of uide bushing (3) all laminate with cylinder cap (2), sensor pencil (5) respectively electric connection sensor (4) with the controller.

2. Tool for detecting the perpendicularity of the guide rod of the valve bridge according to claim 1, wherein the sensor (4) is annular, and at least two sensitive units are distributed on the sensor (4).

3. The detection method of the tool for detecting the perpendicularity of the guide rod of the valve bridge according to any one of claims 1-2, comprising the steps of,

step 1, sleeving a guide sleeve (3) on a valve bridge guide rod (1), and simultaneously attaching the bottom surface of the valve bridge guide rod (1) and a sensor (4) to a cylinder cover (2);

step 2, a sensor (4) detects the distance from the bottom surface of the valve bridge guide rod (1) to the plane of the cylinder cover (2), and the detected information is transmitted to a controller through a sensor wire harness (4) for calculation;

step 3, the specific calculation method is as follows: sensor (4) sensingSubtracting the minimum distance value from the detected maximum distance value to obtain the distance s, wherein the height of the guide sleeve (3) is h, the diameter of the center line of the sensor (4) is a, and the drawing requirement of the perpendicularity of the valve bridge guide rod (1) is shown in the specification

According to

Calculated critical distance s1, expressed by the formula

To obtain

And 4, comparing the value s with the calculated value s1, wherein if s is greater than s1, the verticality is unqualified, and if s is less than s1, the verticality is qualified.

Images