JP2010155284A - Device and method of chucking piston ring - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chucking device preventing a piston ring from being engaged, which causes degradation in operation rates during a piston insertion process, even if the piston ring protrudes out from a ring groove. <P>SOLUTION: The chucking device for chucking the piston ring is provided with: a chucking member for contracting the piston ring radially to chuck it in the ring groove 23 by grasping the piston ring (a top ring 21 and a second ring 22) engaged with the ring groove 23 from radially outward on the piston 20 supported in a predetermined posture, and an air nozzle 12 for regulating partial displacement of the piston ring from a position corresponding to the ring groove 23 due to its own weight by blowing the air against the piston ring. While the air nozzle 12 regulates the displacement of the piston ring, the chucking member chucks the piston ring in the ring groove 23. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a technique for chucking a piston ring in a ring groove of a piston when the piston is inserted into a cylinder block constituting the engine.

  In an engine assembly line or the like, a process is performed in which a piston connected to an engine crankshaft is inserted into a cylinder block constituting the engine. A piston ring is attached to the piston in order to ensure the airtightness of the combustion chamber in the engine. The piston ring is attached to the piston in a state of being fitted into a ring groove formed on the outer peripheral surface of the piston.

  That is, the piston inserted into the cylinder block comes into contact with an inner peripheral surface (hereinafter referred to as “cylinder wall surface”) forming a hole portion into which the piston is inserted in the cylinder block via the piston ring. And since a piston ring closely_contact | adheres to a cylinder wall surface, the airtightness of a combustion chamber is ensured.

  Therefore, the piston ring mounted on the piston and in contact with the cylinder wall surface has a tension (a force to spread). For this reason, the piston ring in a natural state (a state in which no external force is applied) expands in the radial direction with respect to the piston ring in a state of being in contact with the cylinder wall surface. The tension of the piston ring is generally obtained by having a cut portion called a joint. That is, when the piston is inserted into the cylinder block, the piston ring is chucked in the ring groove by being contracted in the radial direction so that the joint is closed.

  Conventionally, a piston ring chucked in a ring groove is brought into a radially contracted state by being gripped from the radially outer side in, for example, an apparatus for automatically assembling a piston (for example, (See Patent Document 1). Specifically, the piston ring is contracted in the radial direction by being gripped by a mechanism having a plurality of gripping portions that press the piston ring inward from the radial direction while being engaged with the ring groove. State. As a result, the piston ring is fitted in the ring groove, that is, in a chucked state.

  The piston in which the piston ring is chucked is inserted into the cylinder block by using a cylindrical jig having a cylindrical or tapered inner peripheral surface whose diameter decreases toward the cylinder wall surface as a guide surface. The That is, the piston with the piston ring chucked is positioned with respect to the cylinder block by being pushed into a jig set in such a manner that the guide surface is continuous with the cylinder wall surface. The piston ring is guided by the guide surface while being held in the chucked state, and is inserted into the cylinder block.

  As described above, the piston ring chucked in the process of inserting the piston is in a state engaged with the ring groove (natural state), for example, a part of one end or the like forming the joint is removed from the ring groove. It may be in a protruding state. Such protrusion of the piston ring from the ring groove is likely to occur when the piston ring has a relatively large expansion amount from the viewpoint of improving the adhesion of the piston ring to the cylinder wall surface.

  When the piston ring protrudes, the protruding part hangs down due to its own weight. Become. That is, when the piston ring protrudes from the ring groove and hangs down, there is a possibility that a part of the piston ring is engaged between the piston and the grip portion. When the piston is inserted while a part of the piston ring is bitten by the piston and the grip portion, there is a risk that the piston ring may be broken.

For this reason, in the process where the piston is inserted, the operation of the equipment is stopped at the stage where the piston ring protrudes (detected stage) or when the piston ring bites. Is called. Such an operation stoppage of the equipment frequently occurs, thereby causing an operation rate impediment in a process in which the piston is inserted.
JP 2003-266255 A

  The present invention has been made in view of the above situation, and even if the piston ring protrudes from the ring groove, the piston becomes a factor that hinders the operation rate in the process of inserting the piston. Provided is a piston ring chuck device and a chuck method capable of preventing the ring from being caught.

In claim 1, the piston ring chuck device for chucking the piston ring in the ring groove of the piston of the engine,
By gripping the piston ring engaged with the ring groove from the radially outer side with respect to the piston supported in a predetermined posture, the piston ring is radially contracted and chucked to the ring groove. Chucking means,
A regulation means for regulating a partial displacement from a position corresponding to the ring groove due to the weight of the piston ring by spraying fluid on the piston ring;
The piston ring is chucked in the ring groove by the chuck means in a state where the displacement of the piston ring is regulated by the regulating means.

In the present invention, the regulating means is
The position where the fluid is sprayed is a portion that forms a joint that is a cut portion of the piston ring.

In claim 3, a piston ring chucking method for chucking a piston ring in a ring groove of a piston of an engine,
By spraying fluid onto the piston ring in a state of being engaged with the ring groove with respect to the piston in a state of being supported in a predetermined posture, a position from the position corresponding to the ring groove due to its own weight of the piston ring A first step of regulating partial misalignment;
In the state where the displacement of the piston ring is regulated by the first step, the piston ring is gripped from the outside in the radial direction, so that the piston ring is contracted in the radial direction and chucked in the ring groove. Two processes,
Is included.

  According to a fourth aspect of the present invention, the position at which the fluid is sprayed is a portion that forms a joint that is a cut portion of the piston ring.

As effects of the present invention, the following effects can be obtained.
That is, according to the present invention, even when the piston ring protrudes from the ring groove, it is possible to prevent the piston ring from being caught, which is a factor of hindering the operation rate in the process of inserting the piston. it can.

  Hereinafter, an embodiment of a piston ring chuck device (hereinafter simply referred to as “chuck device”) according to the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the chuck device according to the present embodiment is a process in which a piston 20 connected to a crankshaft of an engine is inserted into a cylinder block 1 constituting the engine (hereinafter “ It is used in the “piston insertion process”. Therefore, the chuck device according to the present embodiment constitutes a device portion that performs the piston insertion step in a device or the like for automatically assembling the piston 20, for example.

  The piston 20 is inserted into a cylinder bore 2 included in the cylinder block 1. The cylinder bore 2 is a hole formed by a cylinder wall surface 3 that is a cylindrical inner peripheral surface. The piston 20 is connected to an engine crankshaft (not shown) through a connecting rod (connecting rod) 4 while being inserted into the cylinder bore 2.

  Specifically, one end of the connecting rod 4 is a piston pin on one side (upper side in FIG. 1) of the cylindrical axis direction (vertical direction in FIG. 1, the same applies hereinafter) of the piston 20 which is a member having a cylindrical outer shape. It is supported so that rotation is possible. The other end of the connecting rod 4 is connected to a crank pin which is an eccentric part of the crank shaft using a member called a connecting rod cap or the like. In the following description, for the sake of convenience, the side on which the connecting rod 4 is supported in the cylinder axis direction of the piston 20 (the upper side in FIG. 1) is the upper side, and the opposite side is the lower side.

  The piston 20 is inserted into the cylinder bore 2 with the connecting rod 4 connected thereto. Therefore, when the piston 20 is inserted into the cylinder bore 2, it is supported together with the connecting rod 4 in a predetermined posture that can be inserted by a support mechanism (not shown). For example, as shown in FIG. 1, the piston 20 and the connecting rod 4 are inserted from the connecting rod 4 side into the cylinder bore 2 in a state where the connecting rod 4 is supported in a posture along the insertion direction of the piston 20 ( (See arrow A). However, the direction in which the piston 20 with the connecting rod 4 connected thereto is inserted into the cylinder bore 2 may be the opposite direction (from the piston 20 side).

  A piston ring is attached to the piston 20 in order to ensure the airtightness of the combustion chamber in the engine. The piston ring is attached to the piston 20 in a state of being fitted into a ring groove 23 formed on the outer peripheral surface of the piston 20. The piston 20 of this embodiment is equipped with a top ring 21 and a second ring 22 as piston rings. The top ring 21 and the second ring 22 are provided at a predetermined interval in the order of the top ring 21 and the second ring 22 from the side opposite to the side on which the connecting rod 4 is supported in the piston 20 (the lower side in FIG. 1). In addition to these two piston rings, the piston 20 is provided with an oil ring (not shown) for adjusting the lubricating oil and preventing the piston from seizing.

  As shown in FIGS. 2A and 2B, the top ring 21 and the second ring 22 are annular members having the same shape and size as each other, and are fitted into the ring grooves 23, respectively. The piston 20 is attached. 2, the position of the cross section of the piston 20 portion corresponds to the XX position in FIG. 1 for FIG. 2A, and the YY position in FIG. 1 for FIG. Corresponding to In the following description, the “piston ring” is a generic term for the top ring 21 and the second ring 22.

  The piston ring has an abutment 24. The abutment 24 is a cut portion in a piston ring which is an annular member. Accordingly, the abutment 24 is formed by end portions (hereinafter referred to as “ring end portions”) 25 facing each other along the annular shape in the member forming the annular shape. That is, the abutment 24 is a gap between the ring end portions 25 and 25.

  The top ring 21 and the second ring 22 are attached to the piston 20 so that the joints 24 of the top ring 21 and the second ring 22 are located on opposite sides of the outer peripheral surface of the piston 20 from the viewpoint of preventing oil leakage. In other words, the joint 24 of the top ring 21 and the second ring 22 attached to the piston 20 is mutually connected via a circumferential center position corresponding to the outer shape of the piston 20 when viewed in the cylinder axis direction of the piston 20. It exists in the position which opposes (a position which differs by about 180 ° in the circumferential shape). Therefore, in FIG. 2 corresponding to the view of the piston 20 in the cylinder axis direction, as shown in FIG. 2A, the joint 24 of the top ring 21 is at the left end with respect to the circumferential shape showing the outer shape of the piston 20. When positioned, the abutment 24 of the second ring 22 is also positioned at the right end with respect to the circumferential shape, as shown in FIG. 5B, which is a sectional view in the same direction as FIG. It becomes.

  As described above, the piston ring attached to the piston 20 is in close contact with the cylinder wall surface 3 with tension (a force to spread) in a state where the piston 20 is inserted into the cylinder bore 2. For this reason, the piston ring expands in the radial direction in a natural state (a state in which no external force is applied) with respect to the state in contact with the cylinder wall surface 3. That is, when the piston 20 is inserted into the cylinder bore 2, the piston ring has an outer diameter that allows the piston 20 to be inserted into the cylinder bore 2 from a natural state in which the outer diameter is larger than the diameter (inner diameter) of the cylinder bore 2. It is shrunk in the radial direction.

  Here, the piston ring has a shape and size that can be engaged with the ring groove 23 with respect to the outer diameter of the piston 20 or the like. That is, the piston ring is held in the ring groove 23 in its natural state. Therefore, the inner diameter of the piston ring is smaller than the outer diameter of the piston 20, and the piston ring engages with the ring groove 23 in a state where the inner peripheral side portion enters the ring groove 23 (see FIG. 2).

  Shrinkage of the piston ring in the radial direction is allowed by the joint 24. That is, when the piston ring is inserted into the cylinder bore 2 of the piston 20, the piston ring is in a state of being radially contracted so that the joint 24 is closed in a state of being engaged with the ring groove 23 (hereinafter referred to as “engaged state”). Is done. Thus, the piston ring is in a state of being chucked in the ring groove 23 by being radially contracted so that the piston 20 can be inserted into the cylinder bore 2.

  The piston 20 is chucked by the chuck device according to this embodiment when the piston 20 is inserted into the cylinder bore 2. That is, the chuck device according to this embodiment is for chucking the piston ring in the ring groove 23 of the piston 20 of the engine.

  As shown in FIGS. 2 and 4, the chuck device according to the present embodiment includes a plurality of chuck members 11 that chuck the piston ring and an air nozzle 12 that sprays air onto the piston ring.

  The chuck member 11 constitutes a chuck mechanism for chucking the piston ring in the ring groove 23 of the piston 20. The chuck member 11 is provided so as to be positioned around the piston 20 in a state of being supported in a predetermined posture (hereinafter referred to as “set state”) for insertion into the cylinder bore 2 (see FIG. 1). The chuck member 11 is provided so as to be capable of reciprocating in a direction (see arrow B) that is close to and away from the piston 20 in the radial direction with respect to the set piston 20 by a moving mechanism (not shown) using a motor or the like as a drive source. It is done.

  The chuck member 11 presses the engaged piston ring from the radially outer side to the inner side by moving in the direction approaching the piston 20. For this reason, the chuck member 11 has a pressing surface 11a that serves as a contact surface for the piston ring when the piston ring is pressed.

  That is, the pressing surface 11a of the chuck member 11 contacts the outer peripheral surface of the piston ring when the piston ring is pressed by the chuck member 11 (see FIG. 3). The pressing surface 11a is formed as a flat surface or a curved surface along the shape of the outer peripheral surface of the piston ring.

  In the present embodiment, the top ring 21 and the second ring 22 are chucked by the common chuck member 11. Therefore, the pressing surface 11a of the chuck member 11 has a size (dimension in the cylinder axis direction) that can press the top ring 21 and the second ring 22 simultaneously.

  As shown in FIG. 2, the chuck device of the present embodiment includes four chuck members 11 provided at substantially equal intervals (approximately 90 ° intervals) in the outer peripheral direction of the piston 20 in the set state. And the chuck mechanism comprised by these four chuck members 11 will be in the state which grabbed the piston ring by pressing a piston ring radially inward with the four chuck members 11 at the same timing. That is, the four chuck members 11 grip the piston rings by pressing the piston rings with the radial directions (diameter directions of the piston rings) substantially orthogonal to each other as opposed directions of the pair of chuck members 11. As a result, the piston ring is radially contracted and chucked in the ring groove 23.

  As described above, in the chuck device of the present embodiment, the chuck mechanism constituted by the four chuck members 11 grips the engaged piston ring from the radially outer side with respect to the set piston 20. It functions as a chucking means for contracting the piston ring in the radial direction to chuck it in the ring groove 23.

  Note that the number and shape of the chuck members 11 included in the chuck device are not limited to the present embodiment. In other words, the chuck device includes a plurality of chuck members, and the piston ring can be gripped to such an extent that the piston rings are chucked by pressing the piston rings uniformly from a plurality of directions by these chuck members. I just need it. Therefore, for example, the chuck device is configured to include two chuck members that are arranged to face each other via the set piston 20, or six chuck devices that are provided at approximately 60 ° intervals in the outer circumferential direction of the set piston 20. It may be configured to include a chuck member.

  The air nozzle 12 constitutes a regulating mechanism for regulating the posture of the engaged piston ring. As shown in FIG. 4, the air nozzle 12 sprays air from below on the piston ring in the engaged state in the piston 20 in the set state (see arrow C).

  The air nozzle 12 injects the compressed air supplied from the air supply source comprised by a blower etc. from the jet nozzle 12a. Therefore, for example, as shown in FIG. 4, the air nozzle 12 is supported by a support mechanism (not shown) in a posture in which the ejection port 12 a faces the piston ring on the lower side of the piston ring with respect to the set piston 20. Provided.

  The air nozzle 12 regulates the sag due to the weight of the piston ring in an engaged state by spraying air onto the piston ring. That is, the engaged piston ring may partially protrude from the ring groove 23. A part of the piston ring that protrudes from the ring groove 23 hangs down from a position corresponding to the ring groove 23 (position in the cylinder axis direction, the same applies hereinafter) depending on the amount of protrusion.

  Specifically, the sag of the piston ring occurs, for example, at one of the ring end portions 25 that are portions that form the abutment 24 in the piston ring, such as a portion indicated by symbol D in FIG. As described above, the sagging that occurs in the engaged piston ring, that is, the partial positional deviation from the position corresponding to the ring groove 23, causes a part of the piston ring to move between the piston 20 (the outer peripheral surface thereof) and the chuck member 11 (of the This causes a state of being caught between the pressing surface 11a).

  That is, since the piston ring has a portion that is displaced from the ring groove 23 (a portion that hangs down), the piston ring fits well into the ring groove 23 even by being gripped by the four chuck members 11. Instead, a part of the piston ring is caught between the piston 20 and the chuck member 11.

  Therefore, the air nozzle 12 regulates that the engaged piston ring hangs down from the ring groove 23 by spraying air onto the engaged piston ring prior to the chucking of the piston ring by the chuck member 11. Accordingly, the air nozzle 12 can lift the piston ring to a position corresponding to the ring groove 23 or a position where the piston ring can be easily fitted into the ring groove 23 by being gripped by the chuck mechanism. It is configured such that air can be sprayed onto the piston ring with the momentum (wind pressure).

  In other words, the air nozzle 12 is provided at a position (an engaged piston ring in an engaged state) such that the air nozzle 12 blows air to lift the suspended portion of the piston ring to a position corresponding to the ring groove 23 or the like. And a relative positional relationship between the air outlet 12a and the momentum of the air injected from the air outlet 12a.

  As described above, in the chuck device according to the present embodiment, the restriction mechanism configured by the air nozzle 12 sprays air onto the piston ring, so that a partial position from the position corresponding to the ring groove 23 due to the own weight of the piston ring is obtained. It functions as a restricting means for restricting misalignment (sagging).

  The air nozzle 12 may be provided as a common configuration for the top ring 21 and the second ring 22 or may be provided as a separate (dedicated) configuration for each ring. Moreover, about the air nozzle 12, the position (position of the jet nozzle 12a) which injects air toward a piston ring, and the location number (number of the jet nozzle 12a) of the position which injects air toward a piston ring are not specifically limited. . Also, the nozzle shape of the air nozzle 12 is not limited to that shown in FIG. For example, the air nozzle 12 may include a plurality of jet nozzles 12a.

  The air injection direction of the air nozzle 12 is not particularly limited as long as it is a direction in which air can be sprayed from the lower side to the piston ring, such as an upward direction or a diagonally upward direction. It is appropriately set in relation to the position and number of the outlets 12a. Accordingly, with respect to the air injection direction by the air nozzle 12, for example, the air injected upward is sprayed on the top ring 21 positioned on the lower side of the piston 20 in the set state, and the second positioned on the upper side. In order to avoid the air being blocked by the top ring 21, a configuration in which air that is injected obliquely upward is sprayed on the ring 22 is employed.

  Further, with respect to the piston ring, the ring end portion 25 is a portion that is easily displaced due to the influence of external force including gravity acting on the engaged piston ring. For this reason, the sag from the ring groove 23 that causes the piston 20 and the chuck member 11 to be caught is likely to occur in the ring end portion 25 that forms the joint 24.

  Therefore, with respect to the air nozzle 12, it is preferable that the position where the air is sprayed onto the piston ring is a ring end 25 which is a part where the abutment 24 is formed. That is, in this embodiment, as shown in FIGS. 2 and 4, the air nozzle 12 is provided with respect to a pair of ring end portions 25 that form the joints 24 of the top ring 21 and the second ring 22. That is, the chuck device of this embodiment includes four air nozzles 12 for the top ring 21 and two for the second ring 22 in total.

  Therefore, in the chuck device of this embodiment, a pair of air nozzles 12 are provided around the piston 20 on opposite sides (positions facing each other) via the piston 20. That is, as shown in FIG. 2, the chuck device according to the present embodiment includes a pair of air nozzles 12 that spray air onto each ring end portion 25 that forms the joint 24 of the top ring 21, and the piston 20 via the pair of air nozzles 12. And a pair of air nozzles 12 for injecting air to each ring end 25 of the second ring 22 that positions the abutment 24 on the opposite side (opposite positions).

  A piston ring chucking method (hereinafter simply referred to as “chucking method”) according to this embodiment, which is performed in the piston insertion process using the chuck device having the above-described configuration, will be described. The chucking method according to the present embodiment is a method for chucking the piston ring in the ring groove 23 of the piston 20. The chucking method is performed using the first step performed using the air nozzle 12 and the chuck member 11. Second step.

  The first step is a step of restricting the sag from a position corresponding to the ring groove 23 due to the weight of the piston ring by spraying air onto the piston ring in the engaged state with respect to the piston 20 in the set state. .

  That is, in the piston insertion step, after the piston 20 is set when being inserted into the cylinder bore 2, air is sprayed from below onto the engaged piston ring by the restriction mechanism constituted by the air nozzle 12. In the present embodiment, air is sprayed to the pair of ring end portions 25 that form the abutment 24 of the top ring 21 and the second ring 22 in the engaged piston ring.

  As a result, even if the piston ring in the engaged state hangs down from the ring groove 23, the air nozzle 12 blows air so that the portion where the piston ring hangs down corresponds to the ring groove 23. And so on. In other words, the air nozzle 12 causes air to spray onto the engaged piston ring, thereby restricting the sag due to the weight of the engaged piston ring.

  The second step is a step of gripping the piston ring from the outside in the radial direction in a state in which the hanging of the piston ring is regulated by the first step, thereby contracting the piston ring in the radial direction and chucking it in the ring groove 23. It is.

  That is, it is constituted by the plurality of chuck members 11 in a state in which the air is blown by the first step so that the position where the portion hanging down in the piston ring is lifted up to the position corresponding to the ring groove 23 is maintained. The piston ring is chucked by the chuck mechanism. In this embodiment, the piston ring is compressed in the radial direction by being pressed by the four chuck members 11 provided at substantially equal intervals in the outer circumferential direction of the piston 20 in the set state, and is in a chucked state (FIG. 3). reference).

  As described above, the piston 20 is inserted into the cylinder bore 2 while the piston ring is chucked by the chucking method of the present embodiment (see FIG. 1). Specifically, the piston 20 in a state where the piston ring is chucked is a cylindrical jig or a cylindrical jig having a tapered inner peripheral surface whose diameter decreases toward the cylinder wall surface 3 side as a guide surface. Inserted into the cylinder bore 2. That is, the piston 20 with the piston ring chucked is positioned with respect to the cylinder block 1 by being pushed into a jig in which the guide surface is set so as to be continuous with the cylinder wall surface 3. At the same time, the piston ring is guided by the guide surface while being held in the chucked state, and is inserted into the cylinder bore 2.

  According to the chuck device and the chuck method of the present embodiment described above, even if the piston ring protrudes from the ring groove 23, the piston ring is bitten, which is a factor that hinders the operation rate in the piston insertion process. Can be prevented.

  That is, in this embodiment, when the piston ring is chucked by the chuck mechanism constituted by the chuck member 11, the engaged piston ring is lifted by the air from the air nozzle 12 so as not to hang down from the ring groove 23. It is assumed that As a result, the piston ring in the engaged state is held at a position corresponding to the ring groove 23 or the like even if it is a portion that hangs down by protruding from the ring groove 23 when air is not sprayed from the air nozzle 12.

  Therefore, when the piston ring is chucked by the chuck mechanism in a state in which the hanging of the piston ring is restricted by the air nozzle 12, the piston ring in the engaged state can be smoothly moved, including a portion that is liable to hang down, such as the ring end 25 that forms the joint 24, for example. Is fitted into the ring groove 23 over the entire circumference. That is, the piston ring can be reliably chucked, and the piston ring can be prevented from biting between the piston 20 and the chuck member 11.

  Further, in the chuck device and chuck method of the present embodiment, the position where the air is sprayed by the air nozzle 12 is the ring end 25 which is a portion where the sag tends to occur with respect to the engaged piston ring. For this reason, it is possible to effectively prevent the piston ring from drooping.

  In the chuck device and chucking method of the present embodiment, the missing parts of the piston ring can be inspected by monitoring the pressure variation of the air injected from the air nozzle 12 by using a pressure gauge or the like. it can. In this case, the air nozzle 12 is disposed at a position where the fluctuation due to the presence or absence of the piston ring with respect to the pressure of air to be injected can be detected with respect to the piston 20 in the set state. And by measuring the pressure of the air which the air nozzle 12 injects, based on the measured value, the missing item inspection by dropping of a piston ring etc. is performed. As described above, the restriction mechanism constituted by the air nozzle 12 can be used as a means for inspecting a missing piston ring.

  Moreover, in this embodiment, the structure (air nozzle 12) which injects air (air) to a piston ring is employ | adopted as a control mechanism which is a structure for controlling drooping of a piston ring. It is not limited. That is, the configuration for restricting the drooping of the piston ring may be a configuration in which a fluid other than air, for example, an industrial gas other than air or a liquid such as water or oil is ejected.

The figure which shows the piston inserted in a cylinder block. The figure which shows the structure of the chuck apparatus which concerns on one Embodiment of this invention. The figure which shows the state by which the piston ring was chucked. The figure which shows the structure of an air nozzle.

Explanation of symbols

11 Chuck member (chuck means)
12 Air nozzle (regulation means)
20 piston 21 top ring (piston ring)
22 Second ring (piston ring)
23 Ring groove 24 Joint 25 Ring end

Claims (4)

A piston ring chuck device for chucking a piston ring into a ring groove of an engine piston,
By gripping the piston ring engaged with the ring groove from the radially outer side with respect to the piston supported in a predetermined posture, the piston ring is radially contracted and chucked to the ring groove. Chucking means,
A regulation means for regulating a partial displacement from a position corresponding to the ring groove due to the weight of the piston ring by spraying fluid on the piston ring;
In the state where the displacement of the piston ring is regulated by the regulating means, the piston ring is chucked in the ring groove by the chuck means.
A piston ring chuck device characterized by the above. The regulating means is
The position for spraying the fluid is a part that forms a joint that is a cut part of the piston ring,
The piston ring chuck device according to claim 1, wherein the chuck device is a piston ring chuck device. A piston ring chucking method for chucking a piston ring in a ring groove of an engine piston,
By spraying fluid onto the piston ring in a state of being engaged with the ring groove with respect to the piston in a state of being supported in a predetermined posture, a position from the position corresponding to the ring groove due to its own weight of the piston ring A first step of regulating partial misalignment;
In the state where the displacement of the piston ring is regulated by the first step, the piston ring is gripped from the outside in the radial direction, so that the piston ring is contracted in the radial direction and chucked in the ring groove. Two processes,
A method for chucking a piston ring, comprising: The position for spraying the fluid is a part that forms a joint that is a cut part of the piston ring,
The method for chucking a piston ring according to claim 3, wherein:

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