JP2003194506A - Cylinder bore gauge and measuring method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a new cylinder bore gauge and a cylinder bore measuring method which can be applied to a cylinder in which a plug hole is deflected and localized, with no high technology level required. <P>SOLUTION: A probe unit 2 is inserted in a cylinder C from a plug hole PH. A probe piece 13 which can extend only on one side is enlarged until it contacts the inner wall surface of the cylinder C, for measuring diameter, before being reproduced and released on a gauge unit 4. A pair of reproducing jaws 44 pinch the probe piece 13, and the interval is measured to measure a target cylinder bore. The probe unit 2 comprises a dial gauge 21 which follows the opening/closing operation of the probe piece 13, to track the inner wall surface of the cylinder C. The maximum value and the minimum value of diameter are recognized and detected with the dial gauge 21, to separately reproduce each diameter on the gauge unit 4. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder bore gauge and a cylinder bore measuring method capable of measuring the inside diameter of a cylinder, which is normally in a closed state, such as an internal combustion engine, from the outside by using a plug hole having a small diameter. It is about.

BACKGROUND OF THE INVENTION

For example, a racing engine for an automobile,
In order to obtain fairness of the race, in various specifications,
Regulations are strictly regulated, and before the race, each vehicle is inspected for compliance. Of these regulations, the regulations regarding engine displacement, in particular, must be strictly adhered to, because the output improvement due to the increase is remarkable. However,
The cylinder bore, which is one of the factors that determines the engine displacement, cannot be easily measured in the engine assembled state because the cylinder is sealed, and it is practically impossible for the competitors to interact with each other. It's up to trust.

Of course, it is possible to check the bore by overhauling the engine, but in this case, the cost for one time is about several hundreds of thousands of yen, and it is necessary to accept the troublesome work. . For this reason, in high-class races, although it is possible to accept such high costs and time-consuming overhauls, in so-called amateur level races, just to confirm the bore,
I could not accept such an overhaul and it was not realistic. For this reason, there has been a demand for a method capable of easily measuring the cylinder bore from the outside without disassembling the engine, and a method shown in FIG. 11, for example, has been devised. In this method, first, a detector rod 12 'having a pair of probe pieces 13' that can be freely opened and closed.
Is inserted from the plug hole PH and the detector rod 12 'is slid to open the probe piece 13' symmetrically in the cross section of the umbrella, and the bore diameter of the cylinder C is measured and stored. Then, after taking out the probe piece 13 'from the cylinder C in a closed state, the stored probe piece 13' is stored.
Is reproduced, the distance between the opened probe pieces 13 'is measured with a caliper or the like, and the target cylinder bore diameter is measured.

However, this method is not suitable for the plug hole PH.
Is provided in the center of the cylinder C, and is provided along the stroke center of the piston,
In other cases, that is, when the plug hole PH is biased or unevenly distributed with respect to the stroke center of the piston, there is a problem that it cannot be applied. Especially, in a race engine which has a high output and a high rotation speed recently, such an arrangement can hardly be taken due to the valve layout and the like, and the plug hole P
H is always biased and unevenly distributed with respect to the cylinder C. Therefore, the measuring method as shown in FIG. 11 cannot sufficiently deal with this, and a gauge capable of accurately measuring the bore of the cylinder C in which the plug hole PH is deflected and unevenly distributed has been demanded. In terms of the environment in which such gauges are used, it is necessary to consider that the race schedule is tight and the race officials are not necessarily technically savvy engineers. There was a demand for easy handling of the gauge.

[0005]

The present invention has been made recognizing such a background, and can be applied to an engine in which the plug holes are deflected or unevenly distributed, and a high level of skill and skill are required. This is an attempt to develop a new cylinder bore gauge and a cylinder bore measuring method that can be used even without it.

[0006]

That is, the cylinder bore gauge according to claim 1 is applied to a cylinder which is substantially sealed and communicates with the outside through a part of plug holes, and the inner diameter thereof is measured from the outside without overhaul. The device is a device for reproducing the inner diameter observation condition in the cylinder in a state of being inserted into the cylinder using the plug hole and detached from the plug hole, and the probe unit An adapter unit for setting to, and a gauge unit that enables the probe unit to reproduce the inner diameter observation condition measured in the cylinder,
The probe unit includes a body base placed on the set surface of the adapter unit, an outer pipe extending from the body base and inserted into the cylinder, a detector rod sliding in the outer pipe, and a detector. It is formed so that it can project freely at the tip of the rod, and it opens and closes in conjunction with the sliding of the detector rod to detect the diameter dimension of the cylinder and the position of the detector rod that slides in response to the projecting dimension of the probe piece. The gauge unit consists of a lock piece that stores and stores data.On the other hand, the gauge unit consists of a reproduction guide that inserts the probe unit into a nearly flat base frame, and a pair of movable calipers that can be adjusted in position according to the reproduction situation of the probe piece. And is formed so that the mounting state of the cylinder to be measured and the plug hole can be reproduced. The movable caliper is integrated with a pair of reproduction jaws that can come into contact with a protruding probe piece to reproduce the inner diameter observation state of the cylinder, and the pair of reproduction jaws, and these are brought closer to each other by 180 °.・
It is characterized by having a slide part for separating. According to the present invention, the inner diameter of the cylinder can be accurately measured without overhauling the engine. Further, the cylinder bore gauge is relatively easy to handle, and particularly, since there is a lock piece capable of storing and storing the measured diameter dimension, the reproducibility thereof is high and the error caused by the measurer can be suppressed as much as possible. For this reason, the measurement can be performed without having a particularly skilled technique, and stable measurement can be performed at almost the same level regardless of who is the measurer.

Further, in the cylinder bore gauge according to a second aspect of the present invention, in addition to the requirements of the first aspect, the probe unit rotatably connects the distal end portion of the outer pipe and the intermediate portion of the probe piece to each other. It is characterized by having a link. According to the present invention, a concrete configuration in which the probe piece can be extended (opened and closed) by interlocking with the sliding of the detector rod is realized.

Further, in the cylinder bore gauge according to a third aspect of the present invention, in addition to the requirements of the first or second aspect, the probe piece configured to be openable and closable at the tip of the probe unit is provided for one probe unit. It is characterized by being provided. According to the present invention, the probe piece is always opened and closed only on one side, and the inner diameter can be accurately measured even in the cylinder in which the plug hole is biased and unevenly distributed with respect to the stroke center of the piston.

Further, in the cylinder bore gauge according to a fourth aspect, in addition to the requirements according to the first, second or third aspect, the probe unit is provided with a dial gauge on the body base that is linked to the opening / closing operation of the probe piece. It is characterized by. According to the present invention, the work of measuring and reproducing the inner diameter of the cylinder can be performed while observing the dial gauge, so that the work can be performed accurately and reliably. In particular, in the present invention, when measuring the inner diameter of the cylinder, the inner wall surface of the cylinder is traced to detect where the open amount of the probe piece becomes an extreme value. Can be done accurately.

A cylinder bore gauge according to a fifth aspect of the invention is characterized in that, in addition to the requirements of the fourth aspect, the gauge unit includes a micrometer capable of precisely pressing a pair of reproduction jaws in minute dimensions. It is a thing. According to the present invention, the work of reproducing the observation state of the inner diameter of the cylinder measured by the probe piece can be performed with higher accuracy by using the dial gauge together.

The cylinder bore gauge according to a sixth aspect of the present invention is, in addition to the requirements of the first, second, third, fourth or fifth aspect, the gauge unit has a reproduction guide and a movable caliper which are mounted in various plugs. The feature is that the angle and the position can be adjusted appropriately so that the reproduction can be performed. According to this invention, with one gauge unit,
It is possible to deal with cylinder bore measurement of various engines with different deflection and uneven distribution of plug holes.

According to a seventh aspect of the present invention, in a cylinder bore measuring method, a probe unit for measuring the inner diameter of the cylinder is inserted into the cylinder through a plug hole, and a projecting probe piece provided at the tip of the probe unit is attached to the cylinder. Open the cylinder until it touches the inner wall surface, measure the diameter of the cylinder, and then attach the probe unit extracted from the cylinder to a gauge unit that can reproduce the observation condition of the inner diameter of the cylinder. In the method of measuring the target cylinder bore by measuring the distance between the pair of reproduction jaws after moving the slideable reproduction jaw of the gauge unit until it comes into contact with the probe piece, one probe piece is used. One is provided for each probe unit. The probe unit has a dial gauge that follows the opening and closing operation of the probe piece.When measuring the diameter of the cylinder, trace the inner wall surface of the cylinder with the probe piece and recognize the maximum and minimum values of the diameter with the dial gauge. It is characterized in that it is detected and the diameter of each is reproduced separately on the gauge unit. According to this invention, the probe piece is appropriately rotated along the inner wall surface of the cylinder to search for the place where the diameter dimension becomes the extreme value, and the numerical value at that time is detected. Even if the cylinder is deflected and unevenly distributed, its bore can be measured relatively easily and accurately.

Further, in addition to the requirement of claim 7, the cylinder bore measuring method according to claim 8 measures with a probe piece when reproducing the inner diameter observation situation of the cylinder measured by the probe unit on a gauge unit. The extreme value of the opened amount is stored in advance on the scale of the dial gauge, the probe piece is opened very slightly, and then the reproduction jaws are fed by the micrometer in minute dimensions to reproduce the open amount of the probe piece. It is characterized by being reproduced as. According to the present invention, the reproduction as the distance between the reproduction jaws can be performed with extremely high accuracy.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below based on the illustrated embodiments. In the description, the cylinder bore gauge 1 of the device of the present invention will be described first, then the measurement and reproduction mode of the cylinder inner diameter using this gauge will be described, and the cylinder bore measuring method of the method of the present invention will be substantially described. The cylinder bore gauge 1 is configured such that a probe piece 13 that can be opened and closed through a plug hole PH of an engine is inserted into the cylinder C so that the inner diameter of the cylinder C can be measured and reproduced without overhauling the engine. In the invention, the diameter dimension of the cylinder C is observed on each side, and the plug hole PH is deflected with respect to the cylinder C.
Even in the case of uneven distribution, the bore can be accurately measured.

The state where the plug hole PH is deflected with respect to the cylinder C is, as an example, as shown in FIG. 10 (a), the tip of the plug hole PH is located above the cylinder C and substantially in the center. However, it mainly shows a state in which the plug hole PH is provided at an appropriate angle (3 ° with respect to the vertical direction) with respect to the center of the cylinder C (center of stroke of the piston). Further, the state where the plug hole PH is unevenly distributed with respect to the cylinder C, as shown in FIG. 10B as an example, the cylinder C is formed even though the plug hole PH is formed along the center direction of the cylinder C. It mainly shows the state of being provided at a position slightly deviated from the center of. Further, the state in which the plug hole PH is deflected and unevenly distributed with respect to the cylinder C is, for example, as shown in FIG. 10C, the plug hole PH is in an inclined state with an appropriate angle with respect to the center of the cylinder C. The state mainly provided is one in which the tip of the plug hole PH is not located substantially in the center of the cylinder C. The present invention enables the diameter dimension of the cylinder C to be accurately measured and reproduced in such various cases. In this specification, the deflection and uneven distribution of the plug holes PH are collectively referred to as the plug attachment state.

Since the description in this specification assumes a gasoline engine as described above, the plug hole PH mainly means a mounting hole for a so-called spark plug SP. However, the plug is originally meant as a "plug", and in the case of a diesel engine or the like that does not require the spark plug SP, it is normally closed like a mixture injection nozzle hole. Small hole plug hole PH
Shall be understood. The cylinder bore gauge 1 of the device of the present invention will be specifically described below. As shown in FIG. 1 as an example, this is a probe unit 2 that is inserted into a cylinder C through a plug hole PH of an engine and has a substantial measuring action. When performing this measurement, the probe unit 2 is connected to the cylinder C. It comprises an adapter unit 3 for stable setting and a gauge unit 4 for reproducing the diameter dimension of the cylinder C measured by the probe unit 2 almost faithfully. Each constituent unit will be further described below.

First, the probe unit 2 will be described. As an example, as shown in FIGS. 1 to 3, this is a body base 10 that serves as a base when set in the adapter unit 3 and the like, and an outer cylinder pipe 11 that extends from the body base 10 and is inserted into the cylinder C. And a detector rod 12 that slides inside the outer pipe 11, and a cylinder C that is rotatably attached to the tip of the detector rod 12.
And a probe piece 13 for contacting and detecting the diameter of the probe. Here, the connection point between the detector rod 12 and the probe piece 13 is defined as a movable rotation point P.

Further, the probe piece 13 is formed by connecting a midway portion separated from the turning point P so as to be turnable by a link 14, and this connecting point is a movable turning point Q.
And On the other hand, the other end side of the link 14 is rotatably attached to the tip portion of the outer cylinder pipe 11, and this connection point is a fixed rotation point R. The detector rod 12, the probe piece 13, the link 14, etc. are connected in a pantograph shape as a whole in this way, whereby the probe piece 13 is configured to open and close according to the sliding movement of the detector rod 12. ing. In addition, the probe piece 13
The opening / closing amount (overhanging amount) of is determined by the sliding amount of the detector rod 12. A slit 15 formed at the tip of the outer pipe 11 for taking in and out (housing and opening the leg) the probe piece 13 is defined as 15.

The body base 10 is formed in a hollow cylindrical shape as an example, and a lock piece 16 for restricting the sliding of the detector rod 12 and a pressing piece 17 for giving a pressing tendency to the lock piece 16 slide inside. It is freely incorporated, the open end is closed by the lid portion 18, and an opening window 19 for operating the lock piece 16 from the outside is opened in the body side portion. The lid portion 18 is formed integrally with the outer cylinder pipe 11, but a hole through which the detector rod 12 penetrates is opened in the lid portion 18 so that the detector rod 12 can freely slide. .

The lock piece 16 is attached so that the lock body 20 such as a bolt acts on the detector rod 12 penetrating the inside thereof, and by tightening the lock body 20, the lock piece 16 and the detector rod 12 are connected. Of the probe rod 1 of the detector rod 12 for fixing
It prevents sliding to the 3 side. That is, the lock body 20
Detector rod 12 fixed by tightening
The lock piece 16 integrated with this is brought into contact with the lid portion 18 forming the inner bottom surface of the body base 10 to prevent the lock piece 16 from sliding in the direction of the probe piece 13 and to be in the locked state. . Of course, by loosening the lock body 20 such as a bolt, it is possible to release the locked state and put the detector rod 12 in the free slide state. Incidentally, the lock body 20 attached to the lock piece 16
Is a portion which also serves as an operation knob portion when the lock piece 16 is slid.

The pressing piece 17 always gives the locking piece 16 a pressing tendency toward the probe piece 13 side, so that the detector rod 12 always slides toward the probe piece 13 side. And the probe piece 13
It always gives a tendency to open. The pressing piece 17
When pressing the pressing piece 17, the pressing piece 17 is pressed almost uniformly by the dial gauge 21 that operates (follows) the pressing piece 17 and the spring 23 wound around the holding rod 22. However, with the dial gauge 21 alone, with respect to the pressing piece 17, the lock piece 16, etc.,
The spring 23 can be omitted if a sufficient pressing tendency can be imparted. Incidentally, when pressing the pressing piece 17 only with the dial gauge 21, it is possible to position the spindle of the dial gauge 21 just above the detector rod 12, that is, substantially at the center of the pressing piece 17 to press the pressing piece 17 in a well-balanced manner. This is a desirable form for doing.

Next, the adapter unit 3 will be described. This is for stably setting the probe unit 2 in the cylinder C, and as an example, FIGS.
As shown in FIG.
A mounting table 30 on which a plug is placed, and a plug hole P
Extends to H, outer pipe 11, detector rod 12
An adapter guide 31 for guiding the (closed state) and the like into the cylinder C is provided. As shown in the figure, the mounting table 30 has, for example, a substantially disc-shaped outer shape, and the upper surface on which the body base 10 is mounted is a set surface 32. The set surface 32 is provided with a substantially linear mark M in the diameter direction. With the mark M as a guide, the probe unit 2 is placed on the cylinder C, that is, in which direction with respect to the cylinder C. Whether to open the probe piece 13 is generally set.

Next, the gauge unit 4 will be described.
This one reproduces the inner diameter observation situation (diameter dimension) in the cylinder C searched by the probe unit 2 almost faithfully. As an example, as shown in FIGS.
A reproduction guide 42 that inserts the probe unit 2 into a substantially flat base frame 41 that is erected with respect to the base 40, and a pair of movable calipers 43 that can adjust the position according to the reproduction situation of the probe piece 13. It consists of. In this way, the gauge unit 4 holds the probe unit 2 after the measurement by the reproduction guide 42, opens the probe piece 13 to the measured storage position, and then slides the movable caliper 43 in accordance with this to move the cylinder C It reproduces the inside diameter situation.

The reproduction guide 42 is the probe unit 2
In order to insert and hold the (outer cylinder pipe 11), it is formed in a pipe shape (cylindrical shape) in the present embodiment, but it is not necessarily limited to this. For example, the outer cylinder pipe 1
The upper and lower parts of 1 may be individually held. The reproduction guide 42 is preferably formed to have substantially the same length as the adapter guide 31 when the probe unit 2 is set in the cylinder C. Movable caliper 43
Is a pair of reproduction jaws 44 that can contact the probe piece 13 that has been opened to reproduce the observation state of the inside diameter of the cylinder C.
And a slide part 45 that makes them approach and move away from each other by 180 ° facing each other.

As shown in the drawing, the slide portion 45 comprises, for example, a U-shaped slide body 46 and another slide body 47 sandwiched between the slide bodies 46, and the reproduction jaw 44 has both of them. The slide bodies 46 and 47 are provided at both left and right ends. Long holes are formed in the slide bodies 46 and 47, and the mounting state of the plug (here, an appropriately inclined state) is reproduced by inserting a pin or a bolt into the slide body 46, and the slide body 46 is also used. , 47 can be moved independently. In addition, the slide portion 45 is provided with a spring 48 that urges both slide bodies 46 and 47 in a separating direction. Further, in the present embodiment, a push-in body 49 (a commercially available micrometer without a frame and anvil) capable of precisely screwing in the movable caliper 43 is detachably provided on the base frame 41. The movable caliper 43 can be precisely pushed in minutely.
Of course, the push-in body 49 is not limited to the form in which such a micrometer is applied, and it is possible to apply, for example, a screw or the like capable of precise feeding.

In this embodiment, the reproduction jaw 44 is not pushed along the moving direction of the slide portion 45 because the push body 49 is installed substantially horizontally, but the slide bodies 46 and 47 are not pushed. Is the base frame 41
On the other hand, since it is mounted in a state in which it can be moved only in the sliding direction, the deviation between the feeding direction of the pushing body 49 and the sliding direction does not hinder the measurement of the cylinder bore. However, a configuration in which the reproduction jaw 44 is pushed in along the sliding direction can also be appropriately adopted.
Further, in the present embodiment, the pair of slide bodies 46 and 47 are attached to the base frame 41 at an appropriate angle and in an inclined state. However, the slide portion 45 is independently configured as a unit, and It can also be attached so that it can be rotated at an appropriate angle. Furthermore, in the present embodiment, the reproduction guide 42 is attached almost vertically, and the slide portion 45 corresponding to the actual cylinder C is provided.
Although it is attached in an inclined state, the reproduction guide 42 may be attached in an inclined state and the slide portion 45 may be attached almost vertically.

The cylinder bore gauge 1 of the device of the present invention is constructed as described above. Hereinafter, a mode in which the gauge is applied to measure and reproduce the inner diameter of the target cylinder C will be described. [1] Preparation First, the spark plug SP of the cylinder C to be measured (observed) is removed, and the adapter unit 3 is set (see FIG. 7C). At this time, as shown in FIG. 4, for example, the mark M of the mounting table 30 is substantially aligned with the straight line passing through the center of the cylinder C and the plug hole PH when the cylinder C is viewed from the plane (stroke direction). Note that this is the setting when it is desired to open and close the probe piece 13 substantially on this straight line later.

On the other hand, along with the preparation work of the adapter unit 3 as described above, it is preferable that the preparation work of the gauge unit 4 is also performed at this stage. Specifically, a pushing body 49 such as a micrometer that narrows the interval between the movable calipers 43 is attached to the base frame 41 of the gauge unit 4. After that, the base frame 41 to which the push-in body 49 is attached is attached to the base 40 by a permanent magnet type electromagnetic chuck, a screw or the like, and is raised almost vertically. Of course, if the base frame 41 is fixed to the base 40 in a standing state in advance, this work is not necessary. The reproduction guide 42 and the movable caliper 43
If the settings can be freely changed so as to correspond to the mounting states of various plugs, etc., the mounting state of the gauge unit 4 is set according to the mounting state of the actual cylinder C. It is a thing. The movable caliper 43
The pair of reproduction jaws 44 provided at both ends of the are set in a state of being charged and separated in advance by the urging force of the spring 48. It should be noted that such a preparatory work for the gauge unit 4 does not necessarily have to be carried out prior to the actual measurement work, and may actually be carried out before the inner diameter observation situation of the cylinder C is reproduced.

[2] Measurement (1) Initial state of probe unit The probe unit 2 is not particularly loaded or locked in a natural state, as shown in FIG.
As shown in (a), due to the elasticity of the dial gauge 21 and the spring 23, the detector rod 12 is slid toward the tip side, and the probe piece 13 is opened to the maximum extent. The unit 2 is in the initial state. Then, in this initial state, the lock body 20 such as a bolt is tightened, and the lock piece 16 is attached to the detector rod 1.
It is in a locked state (integrated state) in which it is firmly in contact with 2.

(2) Closing of the probe piece From this state, as shown in FIG. 7 (b), the lock body 20 which also functions as the operation knob is pulled against the elasticity of the spring or the like to retract the detector rod 12. The probe piece 13 is closed and inserted from the adapter unit 3 into the cylinder C. Note that FIG. 7C shows a state in which only the adapter unit 3 is set in the cylinder C.
It is preferable that the setting work is performed in the preparatory stage prior to the measurement as described above.

(3) Setting the probe unit When inserting the probe unit 2 into the cylinder C, the probe unit 2 is fitted until the body base 10 contacts the mounting table 30 of the adapter unit 3,
The body base 3 is placed on the mounting table 30 and brought into a stable state (see FIG. 1A). At this time, the probe unit 2 is set so that, for example, the mark M of the mounting table 30 serves as a reference and the opening and closing directions of the mark M and the probe piece 13 are substantially aligned with each other.

(4) Opening of the probe piece (contact detection of the diameter dimension) After setting the probe unit 2 in a stable state, FIG.
As shown in (a), loosen the pull of the operating knob (lock body 20), slide the detector rod 12 toward the probe piece 13 side, and gradually expand the probe piece 13 until it contacts the inner wall surface of the cylinder C. Let it open. Since the needle of the dial gauge 21 swings so as to follow the opening and closing of the probe piece 13 via the pressing piece 17, the lock piece 16, the detector rod 12, etc., it is possible that the probe piece 13 does not come into contact with the inner wall of the cylinder C. , It can be objectively recognized by stopping the pointer of the dial gauge 21. Of course, the contact of the probe piece 13 with the inner wall surface of the cylinder C can be recognized by the feel of the operator's hand.

(5) After the extreme value measuring probe piece 13 comes into contact with the inner wall surface of the cylinder C, the probe unit 2 is slightly rotated as a whole so that the inner wall surface of the cylinder C near the contact point is brought into contact with the probe piece 13. By tracing with the dial gauge 21, the value (extreme value) indicating the maximum or minimum diameter is measured while observing the dial gauge 21. As described above, in the present invention, the cylinder bores are measured (reproduced) one by one, and the rotation axis (plug hole) of the probe piece 13 does not match the central axis of the cylinder C in a deflected / eccentric state. Since it is common, the diameter dimension measured by the probe piece 13 is for detecting a portion where one has a maximum value and the other has a minimum value (see FIG. 9). It should be noted that the maximum value and the minimum value here are only for accurately reproducing the inner diameter state of the cylinder C, and generally, the sum of these values and the required bore diameter are different. Then, in the present embodiment, for the sake of convenience, the description will be made assuming that the diameter dimension having the minimum value is first measured. By the way, tracing the inner wall surface of the cylinder C is for more accurate measurement of the cylinder bore, and conversely, the mark M on the mounting table 30 of the adapter unit 3 is just the probe unit 2.
It is only a rough standard for setting.

(6) Locking the detector rod and setting the dial gauge base point (origin setting) With the diameter dimension at the extreme value (here, the minimum value), as shown in FIG. Is a state in which the lock piece 16 is separated from the lid portion 18 to some extent. In this state, after loosening the lock body 20 to release the lock, the lock piece 16 is attached to the lid portion 18 as shown in FIG. 8B.
Slide (lower) until it comes into close contact with and then lock it again. In this state, the detector rod 12 integrated with the lock piece 16 is prevented from sliding to the probe piece 13 side by the lid portion 18, so that the probe piece 13 cannot be opened to the extreme value or more. Along with this, with the probe piece 13 showing the extreme value, the scale of the dial gauge 21 is adjusted to the base point (origin), and the opening amount at which the probe piece 13 becomes the extreme value is stored and saved.

Once the lock is released in the state shown in FIG. 8A, the probe piece 13 tries to open more than a certain polarization value due to the weight of the detector rod 12 and the biasing force of the spring 23. However, since the probe piece 13 is in contact with the inner wall surface of the cylinder C, there is no fear of opening the probe piece 13 beyond the extreme value. However, the probe piece 1
When it is desired to eliminate the weight of the detector rod 12 acting on the detector rod 3 as much as possible, the detector rod 1 may be attached to the lid 18 or the body base 10 as shown in FIG.
It is also possible to appropriately provide a mode in which a lock screw 50 or the like for preventing the sliding of 2 is separately provided and the detector rod 12 is locked by the screw 50 or the like before the lock body 20 is released.

(7) When the withdrawal diameter of the probe unit shows an extreme value, after locking the detector rod 12 and setting the origin of the dial gauge 21,
The probe unit 2 is pulled out from the cylinder C, and the substantial measurement work is completed. When the detector rod 12 is pulled out, as shown in FIG. 8C, it is preferable to pull the lock body 20 serving as an operation knob again and pull out from the cylinder C with the probe piece 13 closed. Of course, since the detector rod 12 is allowed to slide in the direction of closing the probe piece 13 even in the locked state, the contact between the inner surface of the cylinder C and the probe piece 13 during extraction is extremely small, and the detector rod 12 is damaged. The operation of positively closing the probe piece 13 can be omitted as long as it does not occur. Even if the detector rod 12 is slid in the direction (upward) of closing the probe piece 13,
Since the detector rod 12 moves integrally with the lock piece 16, the extreme amount of opening of the probe piece 13 remains stored and stored.

[3] Reproduction (1) Mounting on gauge unit When the minimum value of the diameter is measured as described above, the detector rod 12 is slid in the direction of compressing the spring 23 by the operation knob (lock body 20). Then, with the probe piece 13 closed, the probe piece 13 is inserted into the reproduction guide 42 and set in the gauge unit 4. When the probe piece 13 is closed, the lock piece 16 integrated with the detector rod 12 is separated from the lid 18 (FIG. 8).
(See (c)).

(2) Reproducible opening of the probe piece (reproduction expansion) After setting the probe unit 2 in the gauge unit 4, the closed probe piece 13 is moved to the extreme value position (lock position) that was previously stored and held. Open (Fig. 1
(C), see FIG. 6). When performing this reproduction opening, the lock piece 16 integrated with the detector rod 12 is used.
Thus, the position is already stored and held, so that it can be reproduced simply by moving the lock piece 16 until it comes into contact with the lid portion 18 of the body base 10. Since the reproduction jaw 44 is set in a charged / separated state by the spring 48 in advance, the reproduction jaw 44 does not come into contact with the reproduction jaw 44 even when the probe piece 13 is opened to the reproduction position. Of course, when the spring 48 is not interposed in the slide portion 45 from the beginning, the diameter dimension of the cylinder C to be measured is predicted from the beginning by the amount of division or the like, and the reproduction jaw 44 is larger than the dimension.
Are separated in advance.

Thereafter, the reproduction jaw 44 with the open probe piece 13 is moved (approximated) until it comes into contact with the probe piece 13, and the diameter dimension on one side (minimum value) is reproduced on the gauge unit 4. It However, in the present embodiment, in order to reproduce with higher accuracy, the reproduction jaw 4
Prior to the approaching movement of No. 4, the probe piece 13 is slightly opened, and such a highly accurate reproducing method will be sequentially described below.

(3) Minute opening of the probe piece For this, first, the lock body 20 such as a bolt is loosened to release the locked state, and the detector rod 12 is attached to the probe piece 13.
The probe piece 13 is opened slightly while watching the dial gauge 21. Of course, when performing this operation, it is premised that the origin of the dial gauge 21 has already been adjusted at the position where the probe piece 13 has the minimum value as described above. That is, by setting the origin of the dial gauge 21 in advance, even if the integrated lock of the detector rod 12 and the lock piece 16 is released, the opening amount that is the minimum value of the probe piece 13 is determined by the scale of the dial gauge 21. It can be reproduced with high accuracy. In the above description, the cylinder C
It was explained that the origin of the dial gauge 21 was set according to the locking work ((6) in [2] above) when the probe piece 13 showed a minimum value by tracing the inner wall surface of the. It suffices to carry out before the above-mentioned lock releasing operation for slightly opening the probe piece 13.

(4) Pushing in the reproducing jaw After opening the probe piece 13 to a very small extent, the reproducing jaw 44
Is pushed in by a pushing body 49 such as a micrometer. Note that the micrometer generally has a reverse rotation stop mechanism by a ratchet, and when the reproduction jaw 44 is pushed in, it can be finely pushed in minute dimensions by a friction provided at one end of the thimble. Then, when the reproduction jaw 44 comes into contact with the probe piece 13 and the pointer of the dial gauge 21 indicates the origin, the pushing operation is completed. By adopting such a pushing method, the diameter dimension measured (observed) in the cylinder C by the probe unit 2 can be reproduced more accurately. Conversely speaking, it is difficult to accurately determine the contact between the reproduction jaw 44 and the probe piece 13 simply by visual observation, and for example, variation easily occurs depending on the position and angle viewed by the operator, and therefore, in the present embodiment. In addition to the visual observation, the dial gauge 21 and the push-in member 49 such as a micrometer capable of precision screwing are used together so that the diameter dimension can be reproduced more objectively and precisely.

(5) Removal of probe unit The probe unit 2 reproduces one diameter dimension (minimum value) on the gauge unit 4 almost faithfully, and then closes the probe piece 13 with the lock body 20 serving as an operation knob. It is removed from the reproduction guide 42 in this state. Of course, also here, when removing the probe unit 2,
If the contact between the reproduction guide 42 and the probe piece 13 is extremely small and there is no concern about damage to the members, the lock body 20
The positive closing operation of the probe piece 13 by means of can be omitted. After that, the probe unit 2 is reinserted into the cylinder C, and the remaining diameter dimension (maximum value)
Is measured.

[4] Measurement of the other diameter dimension The probe unit 2 reinserted in the cylinder C measures the maximum value until the probe piece 13 comes into contact with the inner wall surface of the cylinder C. However, the measurement and the reproducible form are the same as the above-mentioned minimum value, and are omitted here. Then, after reproducing the two diameter dimensions of the minimum value and the maximum value on the gauge unit 4, the distance between the pair of reproduction jaws 44 is measured, and the desired cylinder bore is measured. In order to measure the distance between the pair of reproduction jaws 44 reproduced on the gauge unit 4, it is possible to use a caliper, an inner micrometer, or the like, and a micrometer is applied as the pushing body 49. If it is, it is possible to measure using the scale of this micrometer.

In the present embodiment, a racing engine such as a gasoline engine has been described as a main measurement target, but the present invention is not necessarily limited to this, and various types including general diesel engines are included. It can be applied to the industrial engine, or simply to check the hydraulic cylinder and the like. It is also possible to detect the degree of wear of the cylinder by observing (measuring) the inner diameter of the probe piece 13.

[0045]

According to the cylinder bore gauge of the first aspect, the plug hole PH is not disassembled without disassembling the engine.
Can be used to accurately measure the inner diameter of the cylinder C. In addition, the cylinder bore gauge 1 itself is relatively easy to handle. For example, since there is the lock piece 16 that can store and store the opening amount of the probe piece 13 at an appropriate position, the measured diameter dimension can be reproduced almost accurately, and high skill is not required for measurement and reproduction.

Further, according to the cylinder bore gauge of the second aspect, it is possible to realize a specific structure in which the probe piece 13 is opened and closed in association with the sliding of the detector rod 12. Therefore, the protruding amount (opening / closing amount) of the probe piece 13 can be accurately controlled as the sliding amount of the detector rod 12.

Further, according to the cylinder bore gauge of the third aspect, since one probe piece 13 is provided for each probe unit 2, the plug hole PH is biased and unevenly distributed with respect to the stroke center of the piston. Even with the cylinder C present, its inner diameter can be accurately measured.

According to the cylinder bore gauge of the fourth aspect, since the dial gauge 21 that follows the opening / closing operation of the probe piece 13 with the detector rod 12 and the pressing piece 17 interposed is provided, the measurement and reproduction of the cylinder bore can be performed.
It can be performed with higher accuracy. For example, although the contact of the probe piece 13 with the inner wall surface of the cylinder C can be recognized by the feel or the like of the measurer's hand, the method that depends exclusively on the human senses (mainly the sense of touch) is as described above. Then, it is conceivable that variations may occur depending on the sense of the measurer.
Therefore, here, by using the dial gauge 21 in combination, it is possible to objectively judge that the probe piece 13 comes into contact with the inner wall surface of the cylinder C in addition to the five senses of a person.

According to the cylinder bore gauge of the fifth aspect, the diameter dimension of the cylinder C measured by the probe unit 2 can be reproduced extremely finely on the gauge unit 4. Specifically, the work of pushing the reproduction jaw 44 to the lock position with respect to the probe piece 13 that has been slightly expanded from the lock position can be performed precisely by fine dimensions while observing the dial gauge 21.
The lock position of 3 can be reproduced with high accuracy.

According to the cylinder bore gauge of the sixth aspect, since the angle and the position of the reproduction guide 42 and the movable caliper 43 can be adjusted appropriately, it is possible to cope with various cylinders C having different plug attachment states.

According to the cylinder bore measuring method of the seventh aspect, when measuring the diameter dimension of the cylinder C, the probe piece 13 is appropriately rotated so as to trace the inner wall surface of the cylinder C, and the diameter dimension becomes the extreme value. Since the maximum value and the minimum value at that time are detected while observing the dial gauge 21 while looking at them, the bore can be accurately and reliably measured even in the cylinder C in which the plug hole PH is deflected and unevenly distributed. .

According to the cylinder bore measuring method of the eighth aspect, when reproducing the opening amount of the probe piece 13 as the interval of the reproduction jaws 44, the opening amount of the probe piece 13 opened on the gauge unit 4 is first determined. Since it is memorized by the dial gauge 21, it is opened minutely, and then it is pushed in with a micrometer while observing the scale of the dial gauge 21, the bore measurement of the cylinder C can be performed extremely precisely and easily.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing how an inner diameter of a cylinder is measured and reproduced by a cylinder bore gauge of the present invention.

FIG. 2 is a perspective view showing a probe unit that substantially measures a diameter dimension of a cylinder.

FIG. 3 is a sectional view (a) showing a state in which the probe piece is opened and a sectional view (b) showing a state in which the probe piece is closed.

4A and 4B are a front view and a plan view showing an adapter unit for stably setting a probe unit on a cylinder.

FIG. 5 is a perspective view showing a gauge unit that reproduces a situation of observing the inner diameter of a cylinder.

FIG. 6 is a front view of the same.

FIG. 7 is an explanatory diagram showing, step by step, a mode in which the inner diameter of the cylinder is measured by the probe unit.

FIG. 8 is an explanatory diagram showing, step by step, a mode in which the inner diameter of the cylinder is measured by the probe unit.

FIG. 9 is an explanatory diagram showing how a probe piece traces an inner wall surface of a cylinder to detect a maximum value and a minimum value.

FIG. 10 is a skeletal cross-sectional view showing a plurality of states in which the plug holes are deflected or unevenly distributed with respect to the stroke center of the piston.

FIG. 11 is an explanatory diagram showing a conventional method for measuring the inner diameter of a cylinder.

[Explanation of symbols]

1 cylinder bore gauge 2 probe units 3 Adapter unit 4 gauge unit 10 body base 11 Outer pipe 12 detector rod 13 probe pieces 14 links 15 slits 16 lock pieces 17 Pressing piece 18 Lid 19 open windows 20 rock body 21 dial gauge 22 Holding rod 23 spring 30 table 31 Adapter Guide 32 sets 40 foundation 41 base frame 42 Reproduction guide 43 Movable caliper 44 Reproduction Joe 45 Slide part 46 Slide body (U-shaped) 47 slide 48 springs 49 Pusher (micrometer) 50 screws (for locking) C cylinder M mark P movable turning point Q movable turning point R fixed rotation point SP spark plug PH plug hole

Claims (8)

[Claims] 1. A device which is applied to a cylinder which is substantially sealed and communicates with the outside at some plug holes, and which measures the inner diameter thereof from the outside without overhauling, the device utilizing the plug holes. Then inserted into the cylinder and removed from the plug hole, a probe unit that reproduces the inside diameter observation condition inside the cylinder, an adapter unit for setting this probe unit in the cylinder, and the probe unit The probe unit is provided with a gauge unit capable of reproducing the inner diameter observation condition measured in the inside of the cylinder, and the probe unit extends from the body base placed on the set surface of the adapter unit and extends inside the cylinder. The outer cylinder pipe that is inserted into the Probe rod, which is formed so as to project freely at the tip of the detector rod, opens and closes in conjunction with the sliding of the detector rod, and detects the diameter of the cylinder. The gauge unit is equipped with a lock piece that stores and stores the position of the rod. On the other hand, the gauge unit is a reproduction guide that inserts the probe unit into a nearly flat base frame and the position can be adjusted according to the reproduction situation of the probe piece. It is equipped with a pair of movable calipers, and is formed so as to reproduce the mounting state of the cylinder to be measured and the plug hole.The movable caliper is projected to reproduce the observation condition of the inner diameter of the cylinder. A pair of reproduction jaws that can come into contact with the probe piece and a pair of reproduction jaws that are integrated with each other by 180 ° A cylinder bore gauge characterized in that it has a slide portion that moves toward and away from each other. 2. The cylinder bore gauge according to claim 1, wherein the probe unit includes a link that rotatably connects a tip end portion of the outer cylinder pipe and an intermediate portion of the probe piece to each other. 3. The cylinder bore gauge according to claim 1, wherein one probe unit is provided at one end of the probe unit so as to be openable and closable, and provided for each probe unit. 4. The cylinder bore gauge according to claim 1, 2 or 3, wherein the probe unit has a dial gauge provided on the body base, the dial gauge being linked to the opening and closing of the probe piece. 5. The cylinder bore gauge according to claim 4, wherein the gauge unit includes a micrometer capable of precisely pressing a pair of reproduction jaws by a small size. 6. The angle and position of the gauge unit can be adjusted appropriately so that the reproduction guide and the movable caliper can reproduce the mounting states of various plugs. The cylinder bore gauge according to item 4 or 5. 7. A probe unit for measuring the inner diameter of the cylinder is inserted into the cylinder through a plug hole, and a projecting probe piece provided at the tip of the probe unit is opened until it contacts the inner wall surface of the cylinder. Measure the diameter of the cylinder, and then attach the probe unit extracted from the cylinder to a gauge unit that can reproduce the observation condition of the inside diameter of the cylinder, and reproduce the diameter inside the cylinder as the open amount of the probe piece, allowing the gauge unit to slide freely. After moving the reproduction jaw of until it touches the probe piece,
In a method of measuring an objective cylinder bore by measuring a distance between a pair of reproduction jaws, one probe unit is provided for one probe unit, and the probe unit is an opening / closing operation of the probe unit. In order to measure the diameter of the cylinder with a dial gauge that follows the above, trace the inner wall surface of the cylinder with a probe piece to recognize and detect the maximum and minimum values of the diameter with the dial gauge. Cylinder bore measurement method characterized in that each is reproduced separately on the gauge unit. 8. When reproducing the observation state of the inner diameter of the cylinder measured by the probe unit on a gauge unit, the amount of opening, which is an extreme value measured by the probe piece, is stored in advance on a dial gauge scale. 8. The cylinder bore measurement according to claim 7, wherein the probe piece is opened very slightly, and then the reproduction jaw is fed by a micrometer in increments of fine dimensions to reproduce the opening amount of the probe piece as an interval between the reproduction jaws. Method.