JP3752597B2 - Cylinder bore gauge and cylinder bore measurement method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cylinder bore gauge and a cylinder bore measuring method that can measure the inner diameter of a normally sealed cylinder, such as an internal combustion engine, from the outside using a small-diameter plug hole.
BACKGROUND OF THE INVENTION
[0002]
For example, race engines such as automobiles are strictly regulated in terms of various specifications in order to obtain the fairness of the race. Before the race, the regulations are checked for compliance. ing. Among these regulations, the regulations regarding engine displacement, in particular, must be strictly observed because the output improvement due to the increase is remarkable.
However, the cylinder bore, which is one of the factors that determine the engine displacement, cannot be measured easily because the cylinder is sealed when the engine is assembled. It is left to mutual trust.
[0003]
Of course, it is possible to check the bore by overhauling the engine itself, but in this case, the cost of several times is several hundred thousand yen, and a corresponding effort has to be taken. For this reason, in high-class races, you can accept such overhauls that require high costs and a lot of time, but in so-called amateur-level races, you accept such overhauls only for bore confirmation. It was not possible and it was not realistic.
For this reason, a technique capable of easily measuring the cylinder bore from the outside without disassembling the engine has been desired conventionally. For example, the technique shown in FIG. 11 has been devised. In this method, first, a detector rod 12 'having a pair of openable and closable probe pieces 13' is inserted through the plug hole PH, and the probe rod 13 'is slid in an umbrella cross-sectional shape by sliding the detector rod 12'. The bore diameter of the cylinder C is measured and stored. Then, after the probe piece 13 'is taken out from the cylinder C in a constricted state, the stored opening amount of the probe piece 13' is reproduced, and the distance of the opened probe piece 13 'is measured with a caliper or the like. The cylinder bore diameter is measured.
[0004]
However, this method is applicable when the plug hole PH is provided at the center of the cylinder C and is provided along the stroke center of the piston, and in other cases, that is, the plug hole PH is provided at the stroke center of the piston. In contrast, there is a problem that it cannot be applied when it is deflected and unevenly distributed.
Particularly in the case of a race engine with high output and high rotation recently, such an arrangement can hardly be adopted due to the valve layout and the like, and the plug hole PH is usually deflected and unevenly distributed with respect to the cylinder C. is there. Therefore, the measuring method as shown in FIG. 11 is not sufficient, 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.
Also, from the viewpoint of the usage environment of such gauges, it is necessary to consider that the race schedule is not sufficient in time and that the race official is not necessarily a technically savvy engineer. Gauge handling was also required to be simple.
[0005]
[Technical issues for which development was attempted]
The present invention has been made in view of such a background, and can be applied to an engine in which a plug hole is deflected and unevenly distributed, and can be used even without a high technical level or skill. In addition, the development of a cylinder bore measurement method was attempted.
[0006]
[Means for Solving the Problems]
That is, the cylinder bore gauge according to claim 1 is an apparatus that is applied to a cylinder that is substantially sealed and communicates with the outside in a part of the plug holes, and that measures the inner diameter from the outside without overhauling. A probe unit that reproduces the inner diameter observation state in the cylinder in a state of being inserted into the cylinder using the plug hole and removed from the plug hole, and an adapter unit for setting the probe unit in the cylinder, The probe unit includes a gauge unit that can reproduce an inner diameter observation state measured in a cylinder. The probe unit includes a body base placed on a set surface of the adapter unit, and the body base. An outer pipe that extends from the cylinder and is inserted into the cylinder. A detector rod that slides in the pipe, a probe piece that is formed to project freely at the tip of the detector rod, opens and closes in conjunction with the sliding of the detector rod, and searches for the diameter of the cylinder, and the projecting dimension of the probe piece The gauge unit has a reproduction guide that inserts the probe unit into an almost flat base frame, and the reproduction state of the probe piece. A pair of movable calipers whose positions can be adjusted according to the conditions, and are formed so that the mounting state of the cylinder to be measured and the plug hole can be reproduced. A pair of reproducible jaws that can come into contact with the protruding probe piece, and these pair of reproducible jaws There are, those comprising as characterized by having a sliding portion for which is 180 ° opposite to approach to and separate from each other.
According to the present invention, it is possible to accurately measure the inner diameter of the cylinder without overhauling the engine. In addition, the cylinder bore gauge is relatively easy to handle, and in particular, there is a lock piece that can store and store the measured diameter, so that its reproducibility is high and errors caused by the measurer can be suppressed as much as possible. Therefore, 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.
[0007]
In addition to the requirement of claim 1, the cylinder bore gauge according to claim 2 is provided with a link in which the probe unit is rotatably connected to the distal end portion of the outer pipe and the intermediate portion of the probe piece. It is characterized by comprising.
According to the present invention, a specific configuration in which the probe piece can be extended (openable and closable) in conjunction with sliding of the detector rod is realized.
[0008]
Furthermore, in addition to the requirements of claim 1 or 2, the cylinder bore gauge of claim 3 is provided with one probe piece that can be opened and closed at the tip of the probe unit. It is characterized by this.
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 a cylinder where the plug hole is deflected and unevenly distributed with respect to the stroke center of the piston.
[0009]
According to a fourth aspect of the present invention, in addition to the requirements of the first, second, and third aspects, the probe unit is provided with a dial gauge that operates in conjunction with the opening and closing operation of the probe piece on the body base. It consists of.
According to the present invention, since the work of measuring and reproducing the inner diameter of the cylinder can be performed while looking at the dial gauge, it can be accurately and reliably performed. 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. It can be done accurately.
[0010]
The cylinder bore gauge according to claim 5 is characterized in that, in addition to the requirement according to claim 4, the gauge unit includes a micrometer capable of precisely pushing a pair of reproduction jaws by a minute size. .
According to the present invention, the operation of reproducing the inner diameter observation state of the cylinder measured by the probe piece can be performed with higher accuracy by using the dial gauge together.
[0011]
In addition to the requirements described in the first, second, third, fourth, and fifth aspects, the cylinder bore gauge according to the sixth aspect allows the reproduction unit and the movable caliper to reproduce various plug mounting conditions. In addition, the angle and position can be adjusted as appropriate.
According to the present invention, a single gauge unit can cope with cylinder bore measurements of various engines having different plug hole deflection conditions and uneven distribution conditions.
[0012]
In the cylinder bore measuring method according to claim 7, a probe unit for measuring the inner diameter of the cylinder is inserted into the cylinder through the plug hole, and an overhanging probe piece provided at the tip of the probe unit is attached to the inner wall surface of the cylinder. Open until contact is made, measure the diameter of the cylinder, and then attach the probe unit extracted from the cylinder to a gauge unit that can reproduce the inner diameter observation status of the cylinder, and reproduce the diameter inside the cylinder as the open amount of the probe piece. In the method of measuring the target cylinder bore by measuring the distance between the pair of reproduction jaws after moving the slidable reproduction jaw in the gauge unit until it comes into contact with the probe piece, the probe piece is a single probe unit. And one probe unit. Is equipped with a dial gauge that follows the opening and closing operation of the probe piece, and when measuring the diameter of the cylinder, the probe piece traces the inner wall surface of the cylinder, and the maximum and minimum values of the diameter are recognized by the dial gauge. It is characterized in that it is detected and each diameter is reproduced on the gauge unit separately.
According to the present invention, the probe piece is appropriately rotated along the inner wall surface of the cylinder to find a place where the diameter dimension is an extreme value, and in order to detect the numerical value at that time, the plug hole is located with respect to the stroke center of the piston. Even in a cylinder that is deflected and unevenly distributed, its bore can be measured relatively easily and accurately.
[0013]
In addition to the requirement of the seventh aspect, the cylinder bore measuring method according to the eighth aspect provides an opening amount measured by the probe piece when reproducing the cylinder inner diameter observation state measured by the probe unit on the gauge unit. Is stored in advance on the dial gauge scale, the probe piece is opened slightly, and then the reproducible jaws are fed in fine dimensions by a micrometer, and the open amount of the probe pieces is reproduced as the reproducible jaw interval. This is what makes it a feature.
According to the present invention, the reproduction jaw interval can be reproduced with extremely high accuracy.
[0014]
DETAILED DESCRIPTION OF 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 to which this gauge is applied 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 from the plug hole PH of the 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 of the cylinder C is observed one side at a time, and the bore can be accurately measured even when the plug hole PH is deflected and unevenly distributed with respect to the cylinder C.
[0015]
Here, the state in which the plug hole PH is deflected with respect to the cylinder C is an example where the tip of the plug hole PH is located at a substantially central portion above the cylinder C as shown in FIG. This mainly shows a state in which the hole PH is inclined with respect to the center of the cylinder C (piston stroke center) at an appropriate angle (for example, 3 ° with respect to the vertical direction). Further, the state where the plug hole PH is unevenly distributed with respect to the cylinder C is an example where the plug hole PH is formed along the center direction of the cylinder C as shown in FIG. It mainly shows a state provided at a position somewhat deviated from the center of the. Further, the state in which the plug hole PH is deflected and unevenly distributed with respect to the cylinder C is an example in which the plug hole PH is in an appropriate angle and inclined state with respect to the center of the cylinder C as shown in FIG. The state in which the tip of the plug hole PH is provided and is not positioned at the substantially central portion of the cylinder C is mainly shown. The present invention makes it possible to accurately measure and reproduce the diameter of the cylinder C in such various cases. In the present specification, the deflection and uneven distribution of the plug hole PH are collectively referred to as a plug attachment state.
[0016]
In this specification, since the description is based on the assumption of a gasoline engine, the plug hole PH mainly means a so-called spark plug SP mounting hole. However, the plug originally indicates a “plug”, and in the case where a spark plug SP is not required, such as a diesel engine, the plug is normally closed, such as an injection nozzle hole of an air-fuel mixture. The small hole is assumed to be a plug hole PH. Hereinafter, the cylinder bore gauge 1 of the device of the present invention will be specifically described. As shown in FIG. 1, as an example, this is inserted into the cylinder C through the plug hole PH of the engine, and the probe unit 2 responsible for the substantial measuring action, and the probe unit 2 in the cylinder C for performing this measurement. The adapter unit 3 for stable setting and the gauge unit 4 that reproduces the diameter dimension of the cylinder C measured by the probe unit 2 almost faithfully are provided. Each component unit will be further described below.
[0017]
First, the probe unit 2 will be described. As shown in FIGS. 1 to 3 as an example, this includes a body base 10 that becomes a base when set in the adapter unit 3 and the like, and an outer pipe 11 that extends from the body base 10 and is inserted into a cylinder C. And a detector rod 12 that slides in the outer pipe 11 and a probe piece 13 that is rotatably attached to the tip of the detector rod 12 and detects the diameter of the cylinder C by contact. is there. Here, a connection point between the detector rod 12 and the probe piece 13 is defined as a movable rotation point P.
[0018]
Further, the probe piece 13 is formed such that a part of the probe piece 13 that is separated from the rotation point P is rotatably connected by a link 14, and this connection point is set as a movable rotation point Q. On the other hand, the other end side of the link 14 is rotatably attached to the distal end portion of the outer cylinder pipe 11, and this connection point is set as a fixed rotation point R. The detector rod 12, the probe piece 13, the link 14, and the like are thus connected as a whole in a pantograph shape, so that the probe piece 13 is configured to open and close according to the sliding of the detector rod 12. ing. The opening / closing amount (protruding amount) of the probe piece 13 is determined by the sliding amount of the detector rod 12. In addition, let the slit for taking in / out the probe piece 13 formed in the front-end | tip of the outer cylinder pipe 11 (accommodating or making a leg open) be 15. FIG.
[0019]
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 imparting a pressing tendency to the lock piece 16 are slidably incorporated. In addition, 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 pipe 11, but a hole through which the detector rod 12 passes is opened so that the detector rod 12 can freely slide. .
[0020]
The lock piece 16 is attached to the detector rod 12 penetrating the inside so that a lock body 20 such as a bolt acts, and the lock piece 16 and the detector rod 12 are fixed by tightening the lock body 20. The detector rod 12 is prevented from sliding toward the probe piece 13 side. That is, in the detector rod 12 fixed by tightening the lock body 20, the lock piece 16 integrated with this is brought into contact with the lid portion 18 that forms the inner bottom surface of the body base 10, and in the direction of the probe piece 13. Is prevented from sliding, and is locked. Of course, by loosening the lock body 20 such as a bolt, the locked state can be released and the detector rod 12 can be brought into a free slide state. Incidentally, the lock body 20 attached to the lock piece 16 is a part that also serves as an operation knob portion when the lock piece 16 is slid.
[0021]
The pressing piece 17 always imparts a tendency to press toward the probe piece 13 with respect to such a lock piece 16, and thereby the detector rod 12 always tries to slide toward the probe piece 13, The piece 13 is always given an open tendency. In order to press the pressing piece 17, the pressing piece 17 is pressed almost evenly by the dial gauge 21 linked to (following) the pressing piece 17 and the spring 23 wound around the holding rod 22. However, if the dial gauge 21 alone can give a sufficient pressing tendency to the pressing piece 17, the locking piece 16, etc., the spring 23 can be omitted. Incidentally, when the pressing piece 17 is pressed only by the dial gauge 21, the spindle of the dial gauge 21 is positioned right above the detector rod 12, that is, almost at the center of the pressing piece 17, so that the pressing piece 17 is pressed in a balanced manner. This is a desirable form.
[0022]
Next, the adapter unit 3 will be described. This is for stably setting the probe unit 2 in the cylinder C. As shown in FIGS. 1 and 4, as an example, a mounting table 30 on which the body base 10 of the probe unit 2 is mounted, and the mounting table 30 And an adapter guide 31 that extends to the plug hole PH and guides the outer pipe 11, the detector rod 12 (closed state) and the like into the cylinder C.
As shown in the figure, the mounting table 30 has, for example, a substantially disk-shaped outer shape, and an upper surface on which the body base 10 is placed is a set surface 32. The set surface 32 is provided with a substantially straight mark M in the diametrical direction. Using this mark M as a guide, the mounting state of the probe unit 2 with respect to the cylinder C, that is, in which direction with respect to the cylinder C. Whether to open the probe piece 13 is generally set.
[0023]
Next, the gauge unit 4 will be described. This is to reproduce the inner diameter observation situation (diameter dimension) in the cylinder C probed by the probe unit 2 almost faithfully. As an example, as shown in FIGS. A reconstructed guide 42 for inserting the probe unit 2 and a pair of movable calipers 43 whose positions can be adjusted according to the reproducibility of the probe piece 13 with respect to the almost flat base frame 41 that has been set up. It is. In this way, the gauge unit 4 holds the measured probe unit 2 with 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 inner diameter situation.
[0024]
The reproduction guide 42 is formed in a pipe shape (cylindrical shape) in the present embodiment in order to insert and hold the probe unit 2 (outer cylinder pipe 11), but is not necessarily limited to this. For example, the form which hold | maintains the upper part and lower part of the outer cylinder pipe 11 separately may be sufficient. 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.
The movable caliper 43 includes a pair of reproduction jaws 44 that can come into contact with the probe piece 13 that is opened in order to reproduce the inner diameter observation state in the cylinder C, and a slide portion that makes these approach and separate independently 180 degrees. 45 and comprising.
[0025]
As shown in the figure, the slide portion 45 includes, for example, a U-shaped slide body 46 and another slide body 47 sandwiched between the slide bodies 46, and the reproduction jaw 44 includes both slide bodies 46. , 47 at both left and right ends. A long hole is formed in the slide bodies 46 and 47, and a mounting state of the plug (here, an appropriate inclined state) is reproduced by passing a pin, a bolt or the like through the hole, and the slide body 46 is also provided. , 47 can be moved independently. The slide portion 45 is provided with a spring 48 that urges the slide bodies 46 and 47 in the separating direction. Furthermore, in this embodiment, a pusher 49 (with a frame and anvil removed from a commercially available micrometer) that can be screwed into the movable caliper 43 precisely is detachably provided on the base frame 41. The movable caliper 43 can be precisely pushed in by minute dimensions. Needless to say, the pusher 49 is not necessarily limited to a form in which such a micrometer is applied, and for example, a screw or the like that can perform precise feeding can be applied.
[0026]
In the present embodiment, the reproduction jaw 44 is not pushed along the moving direction of the slide portion 45 because the pusher 49 is installed almost horizontally. Since the frame 41 is attached in a state that allows movement only in the sliding direction, the displacement between the feeding direction of the pusher 49 and the sliding direction does not hinder measurement of the cylinder bore. However, a form in which the reproduction jaw 44 is pushed in along the sliding direction can be appropriately adopted.
In the present embodiment, the pair of slide bodies 46 and 47 are attached to the base frame 41 at an appropriate angle and inclination, but the slide portion 45 is configured independently as a unit, On the other hand, it can also be attached so that it can be rotated at an appropriate angle.
Furthermore, in this embodiment, the reproduction guide 42 is attached substantially vertically and the slide portion 45 corresponding to the actual cylinder C is attached in an inclined state. However, the reproduction guide 42 is attached in an inclined state, and the slide portion 45 is substantially attached. You may attach vertically.
[0027]
The cylinder bore gauge 1 of the device according to the present invention is configured as described above. Hereinafter, an embodiment in which the inner diameter of the target cylinder C is measured and reproduced by applying this gauge will be described.
[1] Preparation
First, the ignition 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, for example, as shown in FIG. 4, the mark M of the mounting table 30 is substantially matched with a 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). This is a setting when it is desired to open and close the probe piece 13 substantially on this straight line later.
[0028]
On the other hand, it is preferable that the gauge unit 4 is also prepared at this stage in accordance with the preparation of the adapter unit 3. Specifically, a pusher 49 such as a micrometer is attached to the base frame 41 of the gauge unit 4 to narrow the interval between the movable calipers 43. After that, the base frame 41 to which the pushing 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, this operation is not necessary if the base frame 41 is fixed in advance to the base 40. If the setting of the reproduction guide 42, the movable caliper 43, etc. can be freely changed so as to correspond to various plug mounting states, the gauge unit 4 is adapted to the mounting state of the actual cylinder C. Is set in advance. The pair of reproduction jaws 44 provided at both ends of the movable caliper 43 are set in a state of being charged and separated in advance by the urging force of the spring 48.
Note that such a preparation operation of the gauge unit 4 is not necessarily performed prior to a substantial measurement operation, and may actually be performed before reproducing the inner diameter observation state of the cylinder C.
[0029]
[2] Measurement
(1) Initial state of the probe unit
In the natural state where no load is applied and the probe unit 2 is not particularly locked, the detector rod 12 is caused by the elasticity of the dial gauge 21 and the spring 23 as shown in FIGS. 3 (a) and 7 (a) as an example. Is slid to the tip side, and the probe piece 13 is opened to a maximum extent, which is the initial state of the probe unit 2. In this initial state, the lock body 20 such as a bolt is tightened, and the lock piece 16 is brought into firm contact with the detector rod 12 (integrated state).
[0030]
(2) Closing the probe
From this state, as shown in FIG. 7 (b), the lock body 20, which also functions as an operation knob, is pulled against the elasticity of a spring or the like, the detector rod 12 is retracted, and the probe piece 13 is closed. Insert from unit 3 into cylinder C. FIG. 7C shows a state in which only the adapter unit 3 is set in the cylinder C. This setting operation is preferably performed at the preparation stage prior to measurement as described above.
[0031]
(3) Probe unit setting
When the probe unit 2 is inserted into the cylinder C, the probe unit 2 is fitted until the body base 10 of the probe unit 2 comes into contact with the mounting table 30 of the adapter unit 3, and the body base 3 is placed on the mounting table 30 (see FIG. FIG. 1 (a)). At this time, the probe unit 2 is set so that, for example, the opening and closing directions of the mark M and the probe piece 13 are substantially matched with respect to the mark M on the mounting table 30.
[0032]
(4) Opening of the probe piece (diameter contact detection)
After setting the probe unit 2 in a stable state, as shown in FIG. 8A, the pull of the operation knob (lock body 20) is loosened, the detector rod 12 is slid to the probe piece 13 side, and the probe piece 13 is moved. The cylinder C is gradually expanded until it contacts the inner wall surface of the cylinder C. In the dial gauge 21, the needle is swung 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, and the like, so that the probe piece 13 is in contact with the inner wall of the cylinder C. The dial gauge 21 can be objectively recognized when the pointer stops. Of course, the contact of the probe piece 13 with the inner wall surface of the cylinder C can also be recognized by the touch of the operator's hand.
[0033]
(5) Extreme value measurement
After the 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, the inner wall surface of the cylinder C in the vicinity of the contact is traced by the probe piece 13, and the diameter is measured while looking at the dial gauge 21. Measure the value that indicates the maximum or minimum dimension (extreme value). As described above, in the present invention, the cylinder bore is measured (reproduced) one side at a time, and the rotation axis (plug hole) of the probe piece 13 is in a deflected and unevenly distributed state that does not coincide with the center axis of the cylinder C. Since there is a general case, the diameter measured by the probe piece 13 is to detect a portion where one has a maximum value and the other has a minimum value (see FIG. 9). Note that the maximum value and the minimum value here are only for accurately reproducing the inner diameter state of the cylinder C, and are generally different from the sum of these and the desired bore diameter. In this embodiment, for the sake of convenience, the description will be made assuming that the diameter dimension that is the minimum value is first measured. Incidentally, the reason why the inner wall surface of the cylinder C is traced is to make the measurement of the cylinder bore more accurate. Conversely, the mark M on the mounting table 30 of the adapter unit 3 is used only when the probe unit 2 is set. It is only a rough standard.
[0034]
(6) Detector rod lock and dial gauge base point setting (origin setting)
In a state where the diameter dimension is an extreme value (here, a minimum value), the lock piece 16 is somewhat separated from the lid portion 18 in the body base 10 as shown in FIG. Is. In this state, the lock body 20 is loosened to release the lock, and then the lock piece 16 is slid (lowered) until it comes into close contact with the lid portion 18 as shown in FIG. In this state, the detector rod 12 integrated with the lock piece 16 is prevented from sliding toward the probe piece 13 by the lid 18 and cannot open the probe piece 13 to an extreme value or more. Accordingly, in the state where the probe piece 13 shows 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 stored.
[0035]
Note that once the lock is released in the state shown in FIG. 8A, the probe piece 13 attempts to open more than the polarization value due to the dead weight of the detector rod 12, the urging force of the spring 23, or the like. Since the probe piece 13 is in contact with the inner wall surface of the cylinder C, there is no fear of opening beyond the extreme value. However, when it is desired to eliminate the dead weight of the detector rod 12 acting on the probe piece 13 as much as possible, the detector rod 12 slides on the lid 18 or the body base 10 as shown in FIG. It is also possible to adopt a mode in which a lock screw 50 or the like for preventing the above is separately provided and the detector rod 12 is locked with the screw 50 or the like and then the lock body 20 is released.
[0036]
(7) Removing the probe unit
When the diameter dimension shows the extreme value, after the lock of the detector rod 12 and the origin setting of the dial gauge 21 are finished, the probe unit 2 is removed from the cylinder C, and the substantial measurement work is finished. When the detector rod 12 is pulled out, it is preferable that the lock body 20 serving as an operation knob is pulled again and the probe piece 13 is closed from the cylinder C as shown in FIG. 8C. Of course, the detector rod 12 is allowed to slide in the direction of closing the probe piece 13 even in the locked state. Therefore, the contact between the inner surface of the cylinder C and the probe piece 13 is extremely small at the time of extraction, and the like. If it is a grade which does not generate | occur | produce, operation which actively closes the probe piece 13 can be abbreviate | omitted. Even if the detector rod 12 is slid in the direction in which the probe piece 13 is closed (upward), the detector rod 12 moves integrally with the lock piece 16. It remains memorized and preserved.
[0037]
[3] Reproduction
(1) Attaching to the gauge unit
When the minimum value of the diameter dimension is measured as described above, the detector rod 12 is slid in the direction in which the spring 23 is compressed by the operation knob (lock body 20), and the probe piece 13 is closed and inserted into the reproduction guide 42. Fill and set 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 (see FIG. 8C).
[0038]
(2) Reproducible opening of the probe piece (reproduction expansion)
After the probe unit 2 is set in the gauge unit 4, the closed probe piece 13 is opened to the extreme value position (lock position) stored and held previously (see FIGS. 1C and 6). In performing this re-release, the position of the lock piece 16 integrated with the detector rod 12 has already been stored and held, so the lock piece 16 is moved until it comes into contact with the lid 18 of the body base 10. It can be reproduced just by making it. Since the reproduction jaw 44 is set in a state of being charged and separated in advance by the spring 48, the reproduction jaw 44 does not come into contact with the reproduction jaw 44 even if the probe piece 13 is opened to the reproduction position. Of course, when the spring 48 is not interposed in the slide part 45 from the beginning, the diameter dimension of the cylinder C to be measured is predicted from the beginning based on the amount of division and the like, and the reproduction jaw 44 is separated in advance beyond that dimension.
[0039]
Thereafter, the reproducible jaw 44 on which the probe piece 13 is opened is moved (approached) until it comes into contact with the probe piece 13, whereby the diameter dimension on one side (minimum value) is reproduced on the gauge unit 4. However, in the present embodiment, in order to reproduce with higher accuracy, the probe piece 13 is slightly opened prior to the approaching movement of the reproduction jaw 44. Hereinafter, such a highly accurate reproduction method will be described. A description will be made sequentially.
[0040]
(3) Fine opening of the probe piece
For this purpose, first, the lock body 20 such as a bolt is loosened to release the locked state, the detector rod 12 can be slid toward the probe piece 13, and the probe piece 13 is opened slightly while looking at the dial gauge 21. Of course, when performing this operation, it is premised that the dial gauge 21 has already been aligned at the position where the probe piece 13 shows the minimum value as described above. That is, by setting the origin of the dial gauge 21, even if the integrated lock of the detector rod 12 and the lock piece 16 is released, the opening amount at which the probe piece 13 becomes the minimum value is determined by the scale of the dial gauge 21. It can be reproduced with high accuracy.
In the above description, the origin of the dial gauge 21 is set along with the locking operation ((6) of [2] above) when the probe piece 13 shows the minimum value by tracing the inner wall surface of the cylinder C. However, in practice, it may be performed by the above-described unlocking operation for slightly opening the probe piece 13.
[0041]
(4) Reproduction jaw push
After slightly opening the probe piece 13, the reproduction jaw 44 is pushed in by a pushing body 49 such as a micrometer. Note that the micrometer generally has a ratchet reverse rotation prevention mechanism, and when the reproduction jaw 44 is pushed in, the micrometer can be pushed in minutely by the 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. In other words, it is difficult to accurately determine the contact between the reproducible jaw 44 and the probe piece 13 by visual observation, and, for example, variations are likely to occur depending on the position and angle viewed by the operator. In addition to visual observation, the dial gauge 21 and a pusher 49 such as a micrometer capable of precision screwing are used in combination so that the diameter can be reproduced more objectively and precisely.
[0042]
(5) Removing the probe unit
The probe unit 2 is removed from the reproduction guide 42 in a state in which the probe piece 13 is closed by the lock body 20 serving as an operation knob after the one radial dimension (minimum value) is reproduced almost faithfully on the gauge unit 4. . Of course, in this case as well, when the probe unit 2 is removed, if the contact between the reproduction guide 42 and the probe piece 13 is extremely small and there is no concern about breakage of the member, the positive closing operation of the probe piece 13 by the lock body 20 is performed. Can be omitted. Thereafter, the probe unit 2 is inserted into the cylinder C again, and the remaining diameter dimension (maximum value) is measured.
[0043]
[4] Measurement of the other diameter
The probe unit 2 reinserted into the cylinder C measures the maximum value until the probe piece 13 comes into contact with the inner wall surface of the cylinder C. The measurement, reproduction form, and the like are as described above. This is the same as the value and is omitted here.
Then, after reproducing 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 required 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 measure using a caliper, an inner micrometer, or the like. It is also possible to measure using the scale of this micrometer.
[0044]
In this embodiment, a race engine such as a gasoline engine has been described as a main measurement object. However, the present invention is not necessarily limited to this, and various industrial products including a general diesel engine are used. The present invention can be applied to an engine, or can be applied to simply check a hydraulic cylinder or the like. Further, it is possible to detect the degree of wear of the cylinder by observing (measuring) the inner diameter of the probe piece 13.
[0045]
【The invention's effect】
First, according to the cylinder bore gauge of the first aspect, the inner diameter of the cylinder C can be accurately measured using the plug hole PH without disassembling the engine. Also, the cylinder bore gauge 1 itself is relatively easy to handle. For example, since there is a lock piece 16 that can store and save the opening amount of the probe piece 13 at an appropriate position, the measured diameter can be reproduced almost accurately, and high skill is not required for measurement and reproduction.
[0046]
Further, according to the cylinder bore gauge of the second aspect, a specific configuration for opening and closing the probe piece 13 in association with the sliding of the detector rod 12 is made possible. For this reason, the protruding amount (opening / closing amount) of the probe piece 13 can be accurately controlled as the sliding amount of the detector rod 12.
[0047]
Further, according to the cylinder bore gauge of claim 3, since one probe piece 13 is provided for one probe unit 2, the cylinder C in which the plug hole PH is deflected and unevenly distributed with respect to the stroke center of the piston. Even so, the inner diameter can be accurately measured.
[0048]
According to the cylinder bore gauge of claim 4, since the dial gauge 21 that follows the opening / closing operation of the probe piece 13 through the detector rod 12, the pressing piece 17 and the like is provided, the measurement and reproduction of the cylinder bore can be performed with higher accuracy. Can be done. For example, the fact that the probe piece 13 is in contact with the inner wall surface of the cylinder C can be recognized by the touch of the measurer's hand or the like, but as described above, the method depends exclusively on the human senses (mainly the tactile sense). Then, it is thought that variation arises according to a measurement person's sense. For this reason, by using the dial gauge 21 together, it is possible to objectively determine that the probe piece 13 has contacted the inner wall surface of the cylinder C in addition to the human senses.
[0049]
Further, 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 on the gauge unit 4 very precisely. Specifically, the operation of pushing the reproduction jaw 44 to the lock position with respect to the probe piece 13 that is slightly expanded from the lock position can be performed precisely in minute dimensions while looking at the dial gauge 21. The lock position can be reproduced with high accuracy.
[0050]
According to the cylinder bore gauge of the sixth aspect, since the angle and position of the reproduction guide 42 and the movable caliper 43 can be adjusted as appropriate, the cylinder bore gauge can cope with various cylinders C having different plug mounting conditions.
[0051]
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 an extreme value. Since the search is performed while looking at the dial gauge 21 and the maximum value and the minimum value at that time are detected, the bore of the cylinder C in which the plug hole PH is deflected and unevenly distributed can be accurately and reliably measured.
[0052]
According to the cylinder bore measuring method of the eighth aspect, when the opening amount of the probe piece 13 is reproduced as the interval of the reproduction jaw 44, the opening amount of the probe piece 13 opened on the gauge unit 4 is first set to the dial gauge 21. Is stored, and then is opened slightly, and then pushed in with a micrometer while looking at the scale of the dial gauge 21, so that the bore measurement of the cylinder C can be performed very precisely and easily.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing a state in which the 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 the diameter of a cylinder.
FIG. 3 is a cross-sectional view (a) showing a state in which the probe piece is opened, and a cross-sectional view (b) showing a state in which the probe piece is closed.
FIG. 4 is 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 an inner diameter observation state of a cylinder.
FIG. 6 is a front view of the same.
FIG. 7 is an explanatory view showing stepwise how to measure the inner diameter of a cylinder with a probe unit.
FIG. 8 is an explanatory view showing stepwise how to measure the inner diameter of a cylinder with a probe unit.
FIG. 9 is an explanatory diagram showing a state in which a probe piece traces the inner wall surface of a cylinder and detects values that are maximum and minimum values.
FIG. 10 is a skeletal sectional view showing a plurality of states in which plug holes are deflected or unevenly distributed with respect to the stroke center of the piston.
FIG. 11 is an explanatory view showing a conventional method for measuring the inner diameter of a cylinder.
[Explanation of symbols]
1 Cylinder bore gauge
2 Probe unit
3 Adapter unit
4 gauge unit
10 Body base
11 Outer pipe
12 Detector rod
13 Probe piece
14 links
15 slit
16 Lock pieces
17 Pressing piece
18 Lid
19 Open window
20 Lock body
21 Dial gauge
22 Holding rod
23 Spring
30 mounting table
31 Adapter guide
32 set surface
40 base
41 Base frame
42 Reproduction Guide
43 Movable caliper
44 Reproduction Joe
45 Slide part
46 Slide body (U shape)
47 Slide body
48 Spring
49 Pushing object (micrometer)
50 screws (for locking)
C cylinder
M mark
P movable rotation point
Q movable pivot point
R Fixed rotation point
SP spark plug
PH plug hole

Claims (8)

A device that is applied to a cylinder that is almost sealed and communicates with the outside in some plug holes, and that measures the inner diameter from the outside without overhauling,
This device is inserted into the cylinder using the plug hole, and a probe unit that reproduces the inner diameter observation state in the cylinder in a state of being removed from the plug hole,
An adapter unit for setting the probe unit in the cylinder;
The probe unit comprises a gauge unit that can reproduce the inner diameter observation situation 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 that slides inside the outer pipe,
A probe piece that is formed so as to protrude freely at the tip of the detector rod, opens and closes in conjunction with the sliding of the detector rod, and searches for the diameter of the cylinder;
Comprising a lock piece for storing and storing the position of the detector rod slid in response to the protruding dimension of the probe piece,
On the other hand, the gauge unit includes a reproduction guide for inserting the probe unit into a substantially flat base frame, and a pair of movable calipers whose positions can be adjusted according to the reproduction state of the probe piece.
It is formed so as to reproduce the mounting state of the cylinder to be measured and the plug hole,
The movable caliper is integrated with a pair of reproducing jaws that can come into contact with a protruding probe piece to reproduce the inner diameter observation state of the cylinder, and is integrated with the pair of reproducing jaws, and approaches and separates them 180 degrees oppositely. A cylinder bore gauge comprising a slide portion. The cylinder bore gauge according to claim 1, wherein the probe unit includes a link that rotatably connects a distal end portion of the outer pipe and an intermediate portion of the probe piece. The cylinder bore gauge according to claim 1 or 2, wherein one probe piece configured to be openable and closable at a tip of the probe unit is provided for one probe unit. 4. The cylinder bore gauge according to claim 1, wherein the probe unit is provided with a dial gauge on the body base that operates in association with the opening / closing operation of the probe piece. 5. The cylinder bore gauge according to claim 4, wherein the gauge unit includes a micrometer capable of accurately pushing a pair of reproduction jaws by a minute size. The angle or position of the gauge unit can be adjusted as appropriate so that the reproduction guide and the movable caliper can reproduce various plug mounting situations. Cylinder bore gauge. Insert the probe unit that measures the inner diameter of the cylinder into the cylinder through the plug hole, open the protruding probe piece provided at the tip of the probe unit until it touches the inner wall surface of the cylinder, and adjust the cylinder diameter. Measure and
After that, the probe unit extracted from the cylinder is attached to a gauge unit that can reproduce the inside diameter observation status of the cylinder, the diameter inside the cylinder is reproduced as the open amount of the probe piece, and the slidable reproducible jaw in the gauge unit In the method of measuring the target cylinder bore by measuring the distance between a pair of reproducible jaws after moving to contact,
One probe piece is provided for one probe unit,
The probe unit includes a dial gauge that follows the opening and closing operation of the probe piece,
When measuring the diameter of a cylinder, trace the inner wall surface of the cylinder with a probe piece, recognize and detect the maximum and minimum values of the diameter with a dial gauge, and reproduce each diameter on the gauge unit separately. A cylinder bore measuring method characterized in that it is configured to do so. When reproducing the cylinder inner diameter observation state measured by the probe unit on the gauge unit, the opening amount that is the extreme value measured by the probe piece is memorized in advance on the dial gauge scale, and then the probe piece is 8. The cylinder bore measuring method according to claim 7, wherein a slight opening is made after that, and the reproducible jaws are fed by a micrometer by a minute dimension so that the opening amount of the probe piece is reproduced as a distance between the reproducible jaws.

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