CN210664415U - Measuring device - Google Patents

Abstract

The utility model provides a measuring device for the lower edge of detecting the camshaft axle bush in the engine closes the piece is at the ascending distance of vertical side with carminative up end. The machine body assembly comprises a machine body assembly, a sliding table assembled on the machine body assembly in a sliding mode and a calibration assembly arranged on the machine body assembly. The calibration assembly comprises a calibration bearing bush and a calibration valve upper end face. The measuring device further comprises a platform assembly arranged below the sliding table and a detection assembly which is assembled on the sliding table in a sliding mode and slides between a first set position and a second set position. The detection assembly comprises a first displacement sensor for detecting the displacement offset of the camshaft bearing bush relative to the calibration bearing bush in the vertical direction, and a second displacement sensor for detecting the displacement offset of the upper end face of the valve relative to the upper end face of the calibration valve in the vertical direction. The displacement sensor is adopted for carrying out corresponding measurement, and then the value of the distance A between the lower edge of the bearing bush and the upper end face of the air valve in the vertical direction is obtained through calculation, so that the measurement accuracy is improved.

Description

Measuring device

Technical Field

The utility model relates to the technical field of engines, especially, relate to a measuring device.

Background

The engine is a core part of the automobile, and when the engine works, the valve expands due to the temperature rise. If there is no gap or too small gap between the valve and its transmission parts (tappet and camshaft) in cold state, the valve is not closed tightly due to expansion of the valve in hot state, resulting in leakage of gas in compression stroke and working stroke of the engine, and thus reducing power. In order to eliminate the phenomenon, in the process of assembling the engine with the side valve, a corresponding clearance is reserved between the valve tappet and the transmission piece to compensate the expansion amount of the valve after being heated, and the valve is ensured to be closed tightly, wherein the clearance is called valve clearance.

To ensure that the valve play corresponds to the assembly specification, it is necessary to detect the value of the distance a in the vertical direction between the lower edge of the camshaft bearing shell and the upper end face of the valve, as shown in fig. 1, which is the distance in the vertical direction between the lower edge of the camshaft bearing shell 1 and the upper end face of the valve 2. The valve clearance is calculated from the measured A value. And selecting a proper tappet to be assembled between each camshaft and each valve according to the calculated valve clearance, wherein the tappet is used for transmitting the thrust of the camshaft to the valve.

The currently adopted method for measuring the A value is as follows: the distance A between each camshaft bearing bush and each valve upper end face is measured one by one manually. Because the mode of manual measurement, not only comparatively complicated, easily receive human factor interference moreover, there is the inaccurate shortcoming of measured data, lead to tappet thickness size to select improperly, take place the potential risk that the valve clearance after the engine assembly does not accord with assembly technical requirement.

SUMMERY OF THE UTILITY MODEL

The utility model provides a measuring device to in the lower edge of the axle bush of detection camshaft and the ascending distance A value in vertical side between the valve up end.

In a first aspect, the present invention provides a measuring device for detecting the distance in the vertical direction between the lower edge of a camshaft bearing in an engine assembly and the upper end surface of a valve. The measuring device comprises a machine body assembly, a sliding table which is assembled on the machine body assembly in a sliding mode and slides along the vertical direction, and a calibration assembly which is arranged on the machine body assembly and located below the sliding table. The calibration assembly comprises a calibration bearing bush and a calibration valve upper end face. The measuring device further comprises a platform assembly which is arranged below the sliding table and used for supporting the engine assembly, and a detection assembly which is assembled on the sliding table in a sliding mode and slides between a first set position and a second set position. When the detection assembly is located at the first set position, the detection assembly is located above the calibration assembly; when the detection component is located at the second set position, the detection component is located above the engine assembly. The detection assembly comprises a first displacement sensor for detecting the displacement offset of the camshaft bearing bush relative to the calibration bearing bush in the vertical direction, and a second displacement sensor for detecting the displacement offset of the upper end face of the valve relative to the upper end face of the calibration valve in the vertical direction.

In the scheme, the offset of the lower edge of a camshaft bearing bush in the engine assembly relative to the offset of the lower edge of a calibration bearing bush in the calibration assembly in the vertical direction is measured by adopting the first displacement sensor, the offset of the upper end surface of a valve in the engine assembly relative to the displacement of the upper end surface of the calibration valve in the vertical direction is measured by adopting the second displacement sensor, and then the value of the distance A between the lower edge of the camshaft bearing bush and the upper end surface of the valve in the vertical direction is obtained by calculation, so that the manual measurement mode is not needed, the measurement deviation caused by human factor interference is reduced, and the measurement accuracy is improved.

In a specific embodiment, the machine body assembly is provided with a first guide rail pair extending along the vertical direction, and the sliding table is slidably assembled on the first guide rail pair. Through adopting first guide rail pair, realize the slip table relative organism subassembly in the slip of vertical direction, be convenient for set up, simplified structure.

In a specific embodiment, the machine body assembly is further provided with a first driving device for driving the sliding table to slide on the first guide rail pair, and the sliding table is driven to slide on the first guide rail pair by the arranged first driving device, so that the sliding of the sliding table is facilitated. When the first driving device is specifically arranged, the first driving device can be a driving cylinder and a linear motor so as to be convenient to arrange.

In a specific embodiment, the sliding table is provided with a second guide rail pair extending along the horizontal direction, and the detection assembly is assembled on the second guide rail pair in a sliding mode. Through adopting the second guide rail pair, realize the slip of the relative slip table of detecting component, be convenient for set up, simplified structure.

In a specific embodiment, the sliding table is further provided with a second driving device for driving the detection assembly to slide between the first setting position and the second setting position, and the second driving device is arranged for driving the detection assembly to slide between the first setting position and the second setting position, so that the sliding of the detection assembly is facilitated. When the second driving device is specifically arranged, the second driving device can be a driving cylinder and a linear motor so as to be convenient to arrange.

In a specific embodiment, the detection assembly further comprises a support assembly arranged on the sliding table, and the first displacement sensor and the second displacement sensor are arranged on the support assembly. Through the supporting component, the first displacement sensor and the second displacement sensor are convenient to arrange.

In a specific implementation mode, the detection assembly further comprises a pressing assembly which is arranged on the supporting assembly and used for pressing the engine assembly or the calibration assembly, and the calibration assembly or the engine assembly is pressed through the pressing assembly, so that the calibration assembly or the engine assembly does not move relative to the detection assembly when the first displacement sensor and the second displacement sensor are used for measuring, and the accuracy of measurement is improved.

In a specific embodiment, the pressing assembly comprises a pressing block, a guide rod and a compression spring, wherein the pressing block is arranged on the supporting assembly and used for pressing against a reference surface of the engine assembly or a reference surface of the calibration assembly, the guide rod is used for connecting the pressing block and the supporting assembly, and the compression spring is sleeved on the guide rod. Through adopting foretell mode as the mode of setting up that compresses tightly the subassembly to set up and compress tightly the subassembly.

In a specific embodiment, the platform assembly comprises a line body for conveying the engine assembly to the position below the sliding table, and a tray which is arranged on the line body and used for placing the engine assembly, so that the engine assembly is conveyed to the detection device conveniently.

In a specific embodiment, the platform assembly further comprises a positioning lifting assembly arranged on the machine body assembly and used for lifting the tray to a position separated from the wire body, so that the engine assembly is lifted to a position where the detection assembly can measure the engine assembly.

In a specific embodiment, the first displacement sensor and the second displacement sensor are both pneumatic displacement sensors, so that the arrangement is convenient and the cost is saved.

Drawings

FIG. 1 is a schematic illustration of the value of the distance A in the vertical direction from the lower edge of a camshaft bearing in an engine assembly to the upper end face of a valve;

fig. 2 is a front view of a measuring device according to an embodiment of the present invention;

fig. 3 is a side view of a measuring device according to an embodiment of the present invention;

fig. 4 is a partial enlarged view of a detection assembly according to an embodiment of the present invention;

fig. 5 is a partial enlarged view of a calibration assembly in a measuring device according to an embodiment of the present invention;

fig. 6 is a partial enlarged view of a measuring device according to an embodiment of the present invention;

fig. 7 is a partial enlarged view of a measuring device according to an embodiment of the present invention.

Reference numerals:

10-machine body assembly 11-first guide rail pair 12-first driving device

20-sliding table 21-first mounting plate 22-second mounting plate

23-second guide rail pair 24-second drive device

30-moving bottom plate 31-guide rod 32-compression spring

33-support mounting plate 34-pressing block 35-sensor mounting plate

40-calibration component 41-calibration bearing bush 42-calibration valve upper end face

51-first displacement sensor 52-second displacement sensor

61-line body 62-tray 63-lifting cylinder

70-Engine Assembly 71-camshaft bearing 72-valve

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings.

For the convenience of understanding the measuring device provided by the embodiment of the present invention, an application scenario thereof will be explained first. The measuring device is used for measuring a value of a distance A between the lower edge of an upper camshaft bearing bush of an engine assembly and the upper end face of a valve in the vertical direction, and then the valve clearance is calculated through the measured value A so as to select a tappet with a proper size as a force transmission structure between the cam and the valve 72. The following describes the measuring device provided by the embodiments of the present invention in detail with reference to the accompanying drawings.

Referring to fig. 2, the present invention provides a measuring device including a body assembly 10, a sliding unit on the body assembly 10 and a sliding table 20 sliding along a vertical direction. When the body assembly 10 is specifically provided, as shown in fig. 2, the body assembly 10 includes a base and a frame structure disposed on the base for supporting. The base and the frame structure can be fixedly connected in modes such as welding, screw fastening, clamping and the like. It should be understood that fig. 2 and 3 illustrate only one manner of providing the body assembly 10, and that other manners may be used.

In the specific arrangement of the slide table 20, referring to fig. 2 and 3, the slide table 20 is a support structure including a first mounting plate 21 for being assembled on the body assembly 10, and a second mounting plate 22 connected to the first mounting plate 21. The first mounting plate 21 and the second mounting plate 22 can be fixedly connected by welding, bolts and the like; the first mounting plate 21 and the second mounting plate 22 may be of an integral structure. It should be understood that the above description shows only one way of composing the slide table 20, and other arrangements may be adopted in addition thereto.

When the sliding table 20 is specifically implemented to slide in the vertical direction relative to the machine body assembly 10, as shown in fig. 2 for the machine body assembly 10, the sliding table 20 is slidably mounted on the first guide rail pair 11 of the machine body assembly 10 extending in the vertical direction, so that the sliding table 20 slides on the machine body assembly 10 through the first guide rail pair 11. Specifically, the first mounting plate 21 of the slide table 20 is slidably mounted on the first rail pair 11. When setting up first guide rail pair 11, first guide rail pair 11 includes two first guide rails that are parallel to each other or are approximately parallel, and the extending direction of every first guide rail is vertical direction, and every first guide rail sliding connection in slip table 20 and two first guide rails to realize the slip of slip table 20 on first guide rail, and improve slip stability of slip table 20 on first guide rail pair 11. It should be understood that the number of first guide rails in the first guide rail pair 11 is not limited to the two shown above, and the number of first guide rails may also be 1, 3, 4, etc. In addition, it should be noted that the manner of implementing the sliding of the sliding table 20 on the machine body assembly 10 is not limited to the manner of implementing the sliding through the first guide rail pair 11 described above, and other manners capable of implementing the sliding of the sliding table 20 on the machine body assembly 10 in the vertical direction may be adopted.

With continued reference to fig. 2, the body assembly 10 is further provided with a first driving device 12 for driving the sliding table 20 to slide on the first guide rail pair 11, and the sliding table 20 is driven to slide on the first guide rail pair 11 by the first driving device 12, so as to facilitate the sliding and locking of the sliding table 20. In setting the first driving device 12 specifically, the first driving device 12 may be a driving cylinder, a linear motor, or the like. It should be understood that the way of driving the sliding table 20 to slide on the first guide rail pair 11 is not limited to the way of driving by the first driving device 12 shown above, and other ways may be adopted. The slide table 20 can be slid on the first rail pair 11 by manual driving, for example.

Referring to fig. 2 and 3, a calibration assembly 40 is further disposed on the body assembly 10, and the calibration assembly 40 includes a calibration bearing shell 41 and an upper end surface 42 of a calibration valve 72. A platform assembly for supporting the engine assembly 70 is arranged below the sliding table 20, and a detection assembly is slidably assembled on the sliding table 20. The detection assembly comprises a first displacement sensor 51 for detecting the amount of displacement offset in the vertical direction of the camshaft bearing shell 71 relative to the calibration bearing shell 41, and a second displacement sensor 52 for detecting the amount of displacement offset in the vertical direction of the upper end face of the valve 72 relative to the upper end face 42 of the calibration valve 72. The distance between the lower edge of the calibration bush 41 in the calibration assembly 40 and the upper end face 42 of the calibration valve 72 is a constant calibration value a0, the displacement offset h1 in the vertical direction of the bush of the camshaft on the engine assembly 70 relative to the calibration bush 41 is measured by the first displacement sensor 51, the offset h2 in the vertical direction of the upper end face of the valve 72 on the engine assembly 70 relative to the upper end face 42 of the calibration valve 72 is measured by the second displacement sensor 52, and the distance a between the lower edge of the bush of the camshaft on the engine assembly 70 and the upper end face of the valve 72 in the vertical direction is AO + h1+ h2, so that the distance a between the lower edge of the camshaft bush 71 on the engine assembly 70 and the upper end face of the valve 72 in the vertical direction is obtained.

In specific arrangement, referring to fig. 2, 3 and 5, the calibration assembly 40 includes a calibration bearing bush 41 and an upper end face 42 of the calibration valve 72, and a distance a0 between a lower edge of the calibration bearing bush 41 and the upper end face 42 of the calibration valve 72 in the vertical direction is constant. When the calibration assembly 40 is disposed on the machine body assembly 10, the calibration assembly 40 may be fixed on the machine body assembly 10 by means of bolt fastening, welding, or the like. Referring to fig. 3 and 5, the calibration component 40 further has a reference surface for pressing the detection component against the calibration component 40, when the detection component detects the calibration component 40, the detection component slides to a first set position, then the sliding table 20 slides in a vertical direction, so that the detection component presses against the reference surface of the calibration component 40, and then the detection component detects the calibration component 40.

Referring to fig. 2, the slide table 20 is slidably mounted with a detection assembly that is slidable between a first set position and a second set position. When the detection component is at the first setting position, the detection component is positioned above the calibration component 40; when the detection component is located at the second setting position, the detection component is located above the engine assembly 70. When the detection assembly slides between the first setting position and the second setting position, referring to fig. 3, a second guide rail pair 23 extending in the horizontal direction is provided on the sliding table 20, and the detection assembly is slidably assembled on the second guide rail pair 23. When the second guide rail pair 23 is provided, referring to fig. 2 and 3, the second guide rail pair 23 includes two second guide rails parallel or approximately parallel to each other, so that the detecting assembly can smoothly slide on the second guide rail pair 23. It should be understood that the manner of implementing the sliding of the detecting component between the first setting position and the second setting position is not limited to the above-described manner of implementing the sliding between the second pair of guide rails 23, and other manners may be adopted.

As shown in fig. 3, a second driving device 24 for driving the detection assembly to slide on the second rail pair 23 is disposed on the machine body assembly 10, and the detection assembly is driven to slide on the second rail pair 23 by the second driving device 24, so as to facilitate the sliding and locking of the detection assembly at the set position. When the second driving device 24 is specifically set, the second driving device 24 may be a driving device such as a driving cylinder, a linear motor, or the like. It should be understood that the manner in which the drive detection assembly slides on the second rail pair 23 is not limited to the manner in which the drive detection assembly is moved by the second drive device 24 as described above, and other manners may be used. For example, a manually actuated detection assembly may be employed to slide on second rail pair 23.

In the setting of the platform assembly, referring to fig. 2, the platform assembly includes a wire body for transporting the engine assembly 70 to the position below the sliding table 20, and a tray 62 disposed on the wire body and used for placing the engine assembly 70, and the engine assembly 70 is supported by using the tray 62, so as to facilitate the transportation of the engine assembly 70. The wire body is a transmission device used for transmitting workpieces in the prior art, and can be specifically composed of a support frame and rollers arranged on the support frame, so that the tray 62 provided with the engine assembly 70 is driven on the wire body.

Referring to fig. 2, a stopper for positioning the motor assembly 70 is disposed on the wire body, and when the motor assembly 70 is conveyed below the sliding table 20, the stopper prevents the motor assembly 70 from sliding forward, so that the motor can be conveyed to a proper position for subsequent measurement. When the stopper is provided, the stopper is a structural member having a blocking function, which is conventional in the prior art.

Referring to fig. 2, the platform assembly further includes a positioning and lifting assembly disposed on the body assembly 10 for lifting the tray 62 to disengage the wire, so that the motor assembly 70 and the wire are disengaged from each other, thereby allowing the wire to be transported without interfering with the measurement of the motor assembly 70. In particular arrangements of the positioning and lifting assembly, the positioning and lifting assembly includes a lifting cylinder 63 for lifting the tray 62, wherein the lifting cylinder 63 is conventional in the art. The piston rod of the lifting cylinder 63 extends to push the tray 62 to move upwards, so that the motor assembly 70 is separated from the wire body.

It should be understood that the manner in which the platform assembly is provided is not limited to that shown above, and that other manners may be used. For example, manual handling and placement may be used. Specifically, a platform for supporting the engine assembly 70 is provided below the slide table 20, and the engine assembly 70 is placed on the platform by manual handling.

In addition, when the engine is placed on the platform assembly, the camshaft cover, the camshaft and the connecting bolt on the engine assembly 70 are firstly detached, so that the displacement sensor can conveniently measure the engine assembly 70. Referring to fig. 2, 3 and 4, the engine assembly 70 with the camshaft cover, the camshaft and the connecting bolt removed has a reference surface, when the detection assembly detects the engine assembly 70, the detection assembly slides to a second set position, then the sliding table 20 slides to be close to the engine assembly 70 along the vertical direction, and after the detection assembly is pressed against the reference surface of the engine assembly 70, the detection assembly starts to detect the engine assembly 70.

When the detecting assembly is specifically arranged, referring to fig. 2, 3, 4, 6 and 7, the detecting assembly further includes a supporting assembly disposed on the sliding table 20 and used for supporting, and the first displacement sensor 51 and the second displacement sensor 52 are disposed on the supporting assembly. When the support assembly is provided, referring to fig. 2, 3 and 4, the support assembly includes a moving base plate 30 slidably assembled on the second guide rail pair 23, and a support mounting plate 33 is disposed below the moving base plate 30, wherein the support mounting plate 33 is connected to the moving base plate 30 through a guide rod 31, and an extending direction of the guide rod 31 is a vertical direction. Wherein, the one end of guide bar 31 can be through oilless bearing and motion bottom plate 30 sliding connection, and the terminal surface of guide bar 31 is provided with spacing piece and makes guide bar 31 can not follow the gliding in the oilless bearing. The other end of the guide rod 31 is fixedly connected with the support mounting plate 33 through a screw fastening mode. A compression spring 32 is provided on the guide bar 31 so that the support mounting plate 33 can slide in the vertical direction relative to the moving base plate 30.

Referring to fig. 2, 3 and 4, a pressing component for pressing the motor assembly 70 or the calibration component 40 is disposed on the supporting component, and the calibration component 40 or the motor assembly 70 is pressed by the pressing component, so that the calibration component 40 or the motor assembly 70 does not move relative to the detection component when the first displacement sensor 51 and the second displacement sensor 52 measure, thereby improving the accuracy of measurement.

When the pressing assembly is provided, as shown in fig. 2, 3 and 4, a pressing block 34 for pressing against a reference surface of the engine assembly 70 or a reference surface of the calibration assembly 40, a guide rod 31 connecting the pressing block 34 and the supporting assembly, and a compression spring 32 sleeved on the guide rod 31 are provided on the supporting assembly. Specifically, referring to fig. 2, 3 and 4, one end of the guide rod 31 is slidably connected to the support mounting plate 33 through an oilless bearing, and a stopper is disposed at one end of the guide rod 31 to prevent the guide rod 31 from sliding out of the oilless bearing. The other end of the guide rod 31 is fixedly connected with the pressing block 34 by means of bolt fastening, welding and the like. The extending direction of the guide rod 31 is a vertical direction, a compression spring 32 is sleeved on the guide rod 31, when the sliding table 20 moves downwards to enable the pressing block 34 to be pressed against the reference surface of the calibration assembly 40 or the reference surface of the engine assembly 70, the sliding table 20 continues to slide downwards to enable the compression spring 32 to be in a compression device, and due to the pressing of the elastic force of the compression spring 32 on the pressing block 34, the pressing block 34 is pressed against the reference surface of the calibration assembly 40 or the reference surface of the engine assembly 70, so that the pressing of the pressing assembly on the engine assembly 70 or the calibration assembly 40 is realized.

Referring to fig. 2, 3 and 4, a sensor mounting plate 35 is provided on the support assembly, and a first displacement sensor 51 and a second displacement sensor 52 are mounted on the sensor mounting plate 35.

When the first displacement sensor 51 and the second displacement sensor 52 are set, the first displacement sensor 51 and the second displacement sensor 52 may be pneumatic displacement sensors, so as to simplify the structure and save the cost. In the specific setting, referring to fig. 4, the first displacement sensor 51 is arranged in the vertical direction, and the measuring direction of the first displacement sensor 51 coincides with the axis of the camshaft bearing bush in the vertical direction, so that the first displacement sensor 51 can measure the displacement offset h1 of the lower edge of the camshaft bearing bush 71 relative to the lower edge of the calibration bearing bush 41. Specifically, when the detecting assembly is pressed against the reference surface of the calibrating assembly 40, the first displacement sensor 51 measures the distance d1 between the lower edge of the calibrating bush 41 and the detecting head of the first displacement sensor 51; the sliding table 20 slides upwards to enable the detection assembly to leave the calibration assembly 40; then sliding the detection assembly to a second set position; the sliding table 20 is slid downwards, the detection assembly is pressed against the reference surface of the engine assembly 70, the first displacement sensor 51 measures the distance d2 between the lower edge of the camshaft bush 71 and the detection head of the first displacement sensor 51, and the displacement offset h1 of the lower edge of the camshaft bush 71 on the engine assembly 70 in the vertical direction relative to the lower edge of the calibration bush 41 is d2-d1, so that the offset h1 of the lower edge of the camshaft bush 71 on the engine assembly 70 in the vertical direction relative to the lower edge of the calibration bush 41 is measured.

When the second displacement sensor 52 is provided, referring to fig. 4, the measurement direction of the second displacement sensor 52 coincides with the axis of the valve 72 on the engine assembly 70. That is, when the axis of the valve 72 is arranged in a manner of forming an included angle θ along the vertical direction, the included angle of the measuring direction of the second displacement sensor 52 relative to the vertical direction is also θ; when the axis of the valve 72 is in the vertical direction, the measurement direction of the second displacement sensor 52 is also in the vertical manner. Thereby enabling the second displacement sensor 52 to accurately measure the displacement offset of the upper end surface of the air outlet valve 72 in the vertical direction with respect to the upper end surface of the calibration air valve 72. In use, the second displacement sensor 52 measures the distance d3 between the upper end face of the calibration valve 72 and the probing tip of the second displacement sensor 52 when the sensing assembly is pressed against the datum surface of the calibration assembly 40; then the detection component is moved to a position where the detection component is pressed on the reference surface of the engine assembly 70, and the second displacement sensor 52 measures the distance d4 between the upper end surface of the valve 72 of the engine assembly 70 and a detection head of the second displacement sensor 52; the distance d4-d3 of the upper end face of the valve 72 from the upper end face 42 of the calibration valve 72 in the axial direction of the valve 72 is then calculated. The displacement offset h2 in the vertical direction from the calibration valve 72 upper end 42 is then calculated to be (d4-d3) × cos θ. Then, the distance A between the lower edge of the bearing bush of the camshaft of the engine assembly 70 and the upper end face of the valve 72 of the engine assembly 70 in the vertical direction is calculated to be h2-h1 (d2-d1) - (d4-d3) cos theta.

In addition, a control unit can be provided for controlling the first driving device 12 to drive the sliding table 20 to slide on the machine body assembly 10, and for controlling the second driving device 24 to drive the detection assembly to slide between the first setting position and the second setting position, so as to facilitate the operation. The control unit is also used for recording the readings of the first displacement sensor 51 and the second displacement sensor 52 during measurement, processing the readings and obtaining the distance A between the lower edge of the camshaft bearing bush 71 of the engine assembly 70 and the upper end face of the valve 72 in the vertical direction, so that manual calculation is not needed and the operation is simplified.

And a storage unit can be further arranged, the measured and calculated data are uploaded to the storage unit for storage, and a database is established, so that quality tracing can be performed in the future.

It should be noted that when the number of the camshaft bushes 71 on the engine assembly 70 is 2 or more, a plurality of the first displacement sensors 51 may be provided, specifically, the number of the first displacement sensors 51 is equal to the number of the camshaft bushes 71 on the engine assembly 70, and each first displacement sensor 51 corresponds to the position of the corresponding camshaft bush 71, so that each first displacement sensor 51 can measure the distance of the lower edge of the corresponding camshaft bush 71. In this case, the number of the calibration pads 41 on the calibration assembly 40 may be equal to the number of the camshaft pads 71 on the engine assembly 70, and the positions thereof may correspond to each other. Specifically, the number of the calibration bearing pads 41 on the calibration assembly 40 is equal, and each calibration bearing pad 41 corresponds to the position of the corresponding camshaft bearing pad 71, so that the first displacement sensor 51 corresponding to the camshaft bearing pad 71 can measure the distance of the lower edge of the calibration bearing pad 41 corresponding to the camshaft bearing pad 71. For example, when the number of the camshaft bushes 71 is 5, the number of the first displacement sensors 51 is also 5, and the number of the calibration bushes 41 on the calibration unit 40 is also 5.

The valves 72 on the engine assembly 70 are divided into intake valves 72 and exhaust valves 72, and the corresponding camshafts are also divided into intake valve 72 camshafts and exhaust valve 72 camshafts that drive the movement of the intake valves 72. Likewise, the intake valve 72 camshaft is fitted on the intake valve 72 camshaft housing 71, and the exhaust valve 72 camshaft is fitted on the exhaust valve 72 camshaft housing 71. At this time, two sets of the first displacement sensors 51 may be provided, one set of the first displacement sensors 51 for detecting the intake valves 72 and the camshaft bush 71, and the other set of the first displacement sensors 51 for detecting the exhaust valves 72 and the camshaft bush 71. Two sets of calibration bearing pads 41 may be provided on the calibration assembly 40, one set of calibration bearing pads 41 corresponding to the outlet valve 72 camshaft bearing pads 71 and the other set of calibration bearing pads 41 corresponding to the inlet valve 72 camshaft bearing pads 71. By adopting the mode, two groups of camshaft bearing bushes 71 can be measured at one time, and the measurement efficiency is improved.

Referring to fig. 2, 3 and 4, the number of the intake valves 72 on the engine assembly 70 may be any value such as 1, 2, 3, 4, etc., and the number of the intake valves 72 may also be any value such as 1, 2, 3, 4, etc. In setting the second displacement sensors 52, two sets of the second displacement sensors 52 may be set, one set of the second displacement sensors 52 being for measuring the upper end surfaces of the intake valves 72, the number of the sets of the second displacement sensors 52 being equal to the number of the intake valves 72; another set of second displacement sensors 52 is used to measure the upper end surface of the outlet gate 72, and the number of the second displacement sensors 52 is equal to the number of the outlet gates 72. By employing two sets of second displacement sensors 52, measurement efficiency is provided.

The offset of the lower edge of a camshaft bearing bush 71 in the engine assembly 70 relative to the offset of the lower edge of a calibration bearing bush 41 in the calibration assembly 40 in the vertical direction is measured by the first displacement sensor 51, the offset of the upper end face of a valve 72 in the engine assembly 70 relative to the offset of the displacement of the upper end face of the calibration valve 72 in the vertical direction is measured by the second displacement sensor 52, and then the value of the distance A between the lower edge of the camshaft bearing bush and the upper end face of the valve 72 in the vertical direction is obtained by calculation, so that the manual measurement mode is not needed, the measurement deviation caused by human factor interference is reduced, and the measurement accuracy is improved.

The above embodiments are only specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention, and all should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A measuring device for measuring a vertical distance between a lower edge of a camshaft bearing in an engine assembly and an upper end surface of a valve, comprising:

a body assembly;

the sliding table is assembled on the machine body assembly in a sliding mode and slides along the vertical direction;

the calibration assembly is arranged on the machine body assembly and positioned below the sliding table, and comprises a calibration bearing bush and a calibration valve upper end face;

the platform assembly is arranged below the sliding table and used for supporting the engine assembly;

the detection assembly is assembled on the sliding table and slides between a first set position and a second set position; when the detection assembly is located at the first set position, the detection assembly is located above the calibration assembly; when the detection component is positioned at the second set position, the detection component is positioned above the engine assembly;

the detection assembly comprises a first displacement sensor and a second displacement sensor, wherein the first displacement sensor is used for detecting the displacement offset of the lower edge of the camshaft bearing bush relative to the lower edge of the calibration bearing bush in the vertical direction, and the second displacement sensor is used for detecting the displacement offset of the upper end face of the valve relative to the upper end face of the calibration valve in the vertical direction.

2. The measuring device of claim 1, wherein the body assembly is provided with a first pair of guide rails extending in a vertical direction, and the slide table is slidably fitted on the first pair of guide rails.

3. The measuring device of claim 2, wherein the body assembly further includes a first driving device for driving the sliding table to slide on the first rail pair.

4. The surveying instrument as claimed in any one of claims 1 to 3, wherein a second rail pair extending in a horizontal direction is provided on the slide table, and the detecting unit sliding means is provided on the second rail pair.

5. The measuring device according to claim 4, wherein a second driving device for driving the detecting assembly to slide between the first setting position and the second setting position is further provided on the slide table.

6. The measuring device of claim 1, wherein the detecting assembly further comprises a support assembly provided on the slide table, and the first displacement sensor and the second displacement sensor are provided on the support assembly.

7. The measuring device of claim 6, wherein the detection assembly further comprises a compression assembly disposed on the support assembly for compressing the motor assembly or the calibration assembly.

8. The measurement device of claim 7, wherein the compression assembly comprises:

the pressing block is arranged on the supporting component and is used for pressing against the datum plane of the engine assembly or the datum plane of the calibration component;

the guide rod is connected with the pressing block and the supporting component;

and the compression spring is sleeved on the guide rod.

9. The measurement device of claim 1, wherein the platform assembly comprises a wire body that carries the motor assembly below the skid, and a tray disposed on the wire body for placement of the motor assembly.

10. The measurement device of claim 9, wherein the platform assembly further comprises a positioning and lifting assembly disposed on the body assembly for lifting the tray out of the line position.

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