JP2010043586A - Shoe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shoe adapted to absorb shock due to striking load as much as possible. <P>SOLUTION: The shoe 5 includes: a spherical surface section 11 slidingly contacting a hemispherical sliding surface 4a formed on a piston 4; and a flat end face 12 slidingly contacting a swash plate 3. An internal space S is formed by forming the spherical surface section 11 and the end face 12 in the shape of a thin wall. Radial grooves 14 as recessed sections radially formed around the central axis of the shoe 5 on the side of the end face 12 and the spherical surface section 11, and an annular groove 15 as a recessed section formed to surround the central axis are formed in an inner surface facing the internal space S of the shoe 5. Consequently, the shock exerted on the shoe 5 by the striking load can be suppressed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a shoe, and more particularly, to a shoe having a spherical surface that is in sliding contact with a hemispherical sliding surface of a piston and a flat end surface that is in sliding contact with a swash plate.

Conventionally, a swash plate compressor includes a swash plate that rotates about a rotation axis, a piston that moves forward and backward as the swash plate rotates, and a substantially hemispherical shoe provided between the swash plate and the piston. (Patent Documents 1 to 3).
The shoe includes a spherical surface portion that is in sliding contact with the hemispherical sliding surface of the piston and a flat end surface portion that is in sliding contact with the swash plate. An internal space is formed.
JP 2002-39058 A JP 2005-90385 A JP 2007-278149 A

However, even in the shoe having an internal space disclosed in Patent Documents 1 to 3, the shoe and the swash plate intermittently collide due to the striking load on the shoe due to the reciprocating motion of the piston. There was a problem that the coating formed on the surface of the swash plate was worn.
In view of such a problem, the present invention provides a shoe that has an internal space and can absorb as much as possible the impact caused by the above-mentioned striking load.

In other words, the shoe according to claim 1 includes a spherical surface portion that is in sliding contact with a hemispherical sliding surface formed on the piston, and a flat end surface portion that is in sliding contact with the swash plate, and the spherical surface portion and the end surface portion are thin-walled. In the shoe formed in the shape and formed the internal space,
The inner surface facing the internal space is provided with a concave portion formed thinner than other portions.

  The shoe according to claim 2 is characterized in that the recess is a radial groove formed radially about the central axis of the shoe.

  Further, the shoe according to claim 12 is characterized in that the recess is an annular groove formed so as to surround the central axis of the shoe.

  The shoe according to claim 16 is characterized in that a plurality of the recesses are dimples formed on the inner surface.

According to the first aspect of the present invention, by providing the inner surface facing the internal space with the concave portion formed thinner than the other portions, the sliding surface or inclined surface of the piston by the spherical surface portion or the end surface portion is provided. The shoe can be reduced in weight while maintaining the sliding area with the plate, and the shoe is elastically deformed at the thin portion where the concave portion is formed.
As a result, it is possible to reduce the striking load itself by reducing the weight of the shoe, and thus it is possible to suppress the impact acting between the shoe and the swash plate. Further, the impact can be absorbed as much as possible by elastic deformation of the recess.

  According to the second aspect of the present invention, by forming the concave portion as a radiating groove, the shoe can be elastically deformed along the radiating groove, thereby absorbing an impact caused by a striking load acting on the shoe. It is possible.

  According to the twelfth aspect of the present invention, by forming the concave portion as an annular groove, the shoe can be elastically deformed along the annular groove, thereby absorbing an impact caused by a striking load acting on the shoe. It is possible.

  According to the sixteenth aspect of the present invention, by forming the concave portion into a plurality of dimples, the shoe can be elastically deformed along the plurality of dimple patterns, thereby absorbing an impact caused by a striking load acting on the shoe. It is possible to do.

FIG. 1 schematically shows an internal structure of a swash plate compressor 1, and shows a rotary shaft 2 supported by a housing (not shown), a swash plate 3 fixed to the rotary shaft 2, and a housing. A plurality of pistons 4 that move forward and backward in a cylinder bore (not shown) and a plurality of shoes 5 that are provided so as to face the inside of each piston 4 and sandwich the swash plate 3 are shown.
The swash plate 3 is fixed obliquely with respect to the rotary shaft 2 or can change the inclination angle of the swash plate 3, and is sandwiched by two shoes 5 for each piston 4. . The portion of the swash plate 3 that is in sliding contact with the shoe 5 is coated with a required sprayed layer, a plating layer, a resin coating, or the like.
The piston 4 is formed with a hemispherical sliding surface 4a so as to face each other, and the shoe 5 swings with respect to the sliding surface 4a, and the rotation of the swash plate 3 is caused to rotate. It is supposed to convert to advance and retreat.
In addition, the swash plate type compressor 1 having such a configuration is conventionally known, and further detailed description thereof is omitted.

Hereinafter, the shoe 5 will be described. As shown in FIG. 2 and the like, the shoe 5 slides against the swash plate 3 and the spherical portion 11 formed in a thin shape that slides against the sliding surface 4 a of the piston 4. The inner surface S is formed inside the spherical surface portion 11 and the end surface portion 12.
In the present embodiment, the shoe 5 can be made of a sintered material, a resin material, or the like in addition to iron-based, copper-based, and aluminum-based materials, and is preferably manufactured from SUJ2. Further, the plate thickness of the spherical surface portion 11 and the end surface portion 12 is preferably 0.1 to 2 mm, and preferably 0.2 to 1.5 mm from the viewpoint of simultaneously achieving weight reduction and ensuring rigidity and springiness. Is more desirable.
A through hole 13 is formed at the top of the spherical surface portion 11, an escape portion 11 a that does not contact the sliding surface 4 a of the piston 4, and the escape portion 11 a around the through hole 13 on the outer peripheral surface of the spherical surface portion 11. And a contact portion 11b that is slidably contacted with the sliding surface 4a formed around the periphery.
Although not shown in the drawing, the end surface portion 12 slightly bulges toward the swash plate 3 side, so that lubricating oil is drawn between the end surface portion 12 and the swash plate 3.

And the shoe 5 concerning this invention forms the recessed part with plate | board thickness thinner than another part in the inner surface which faces the said internal space S. As shown in FIG.
FIG. 2 is a cross-sectional view of the shoe 5 in which the radial groove 14 as the concave portion is formed. The radial groove 14 is formed radially about the central axis of the shoe 5.
3A to 3E show an example of the radiating grooves 14 formed on the end face 12 side, and the radiating grooves 14 have a cross-sectional arc shape shown in FIG. 4A. However, it is possible to selectively use a U-shaped cross-section shown in (b) with a bottom surface and side surfaces formed, or a combination thereof.
The shoe 5 shown in FIG. 3A is the shoe 5 shown in FIG. 2, and the radiation groove 14 intersects at the center of the end face portion 12 and has a constant width.
In the shoe 5 shown in FIG. 3B, the radiating grooves 14 intersect at the central portion of the end surface portion 12, and the width gradually increases from the central portion toward the outside.
The shoe 5 shown in FIG. 3 (c) is different from the shoe 5 of FIG. 3 (a) in that the radiating grooves 14 do not intersect at the center portion of the end surface portion 12, but are separated from each other at the center portion of the end surface portion 12. It has become.
The shoe 5 shown in FIG. 3D has a semicircular end on the central side of the radial groove 14 with respect to the shoe 5 in FIG.
The shoe 5 shown in FIG. 3E is such that the end of the radiating groove 14 does not intersect with the shoe 5 of FIG. 3B at the center of the end surface 12 and is separated from the center of the end 12. It has become.
The shoe 5 shown in FIGS. 3 (f) and 3 (g) has a through hole 12 a formed at the center of the end surface portion 12, and the through hole 12 a shown in FIG. A surplus material is formed so as to protrude toward the internal space S by bending during manufacture.
In (f) and (g), the end of the radiating groove 14 is formed to a position close to the through hole 12a, and the tip of the radiating groove 14 is prevented from reaching the through hole 12a.

According to the shoe 5 in which the radiating groove 14 is formed on the inner surface of the end surface portion 12 described above, the radiating groove 14 is formed because the radiating groove 14 is formed thinner than other portions of the end surface portion 12. The shoe 5 can be made lighter by the amount.
As a result, it is possible to suppress an impact when the shoe 5 collides with the swash plate 3 as the piston 4 reciprocates, and it is possible to suppress wear of the coating formed on the swash plate 3.
In addition, since the radiation groove 14 is formed on the inner surface of the shoe 5, the sliding contact area between the end surface portion 12 and the swash plate 3 is not narrow compared to the conventional shoe 5, and the same sliding performance as the conventional one is obtained. be able to.
Next, since the radiation groove 14 is formed on the end surface portion 12 side, the end surface portion 12 extends along the radiation groove 14 even if the end surface portion 12 of the shoe 5 collides obliquely with the swash plate 3. Since it is elastically deformed, the impact at the time of collision can be relaxed and damage to the coating can be suppressed.
Further, even during normal sliding, the end face portion 12 is deformed so as to conform to the swash plate 3 by elastic deformation, so that an oil film is formed between the shoe 5 and the swash plate 3 by the lubricating oil, and good sliding is achieved. Dynamic performance can be obtained.
Here, when the radiating groove 14 has a circular arc shape as shown in FIG. 4A, the end surface portion 12 is slightly deformed while maintaining rigidity along the radiating groove 14, and even if a high compressive force is applied. It is possible to withstand this.
On the other hand, when the radiating groove 14 has a U-shaped cross-section as shown in FIG. 4B, the radiating groove 14 has a large spring effect because the boundary portion between the bottom surface portion and the side surface portion is easily bent. It is possible to positively obtain the effect of relieving the problem and the conformability of the end surface portion 12.
From the above, according to the shoe 5 in which the radiating groove 14 is formed in the end face portion 12, the coating formed on the swash plate 3 can be made cheaper than the conventional one, or the coating itself can be omitted. Therefore, the manufacturing cost of the swash plate 3 can be reduced.
Furthermore, the deformation state of the end surface portion 12 can be adjusted by making the width of the radiation groove 14 and the shape of the end portion of the central portion different as shown in FIGS. 3 (a) to 3 (g). Yes, it can be appropriately selected according to the performance of the swash plate compressor 1.
In addition, arrangement | positioning of the radiation groove 14 in Fig.3 (a)-(g) is an example, For example, the number and width | variety of the radiation groove 14 can be changed. Further, in FIG. 3F, the end of the radiation groove 14 does not reach the through hole 13, but it may be formed up to the through hole 13.

FIG. 5 shows a cross-sectional view of the shoe 5 in which the radiating groove 14 is formed on the inner surface of the spherical portion 11, and FIGS. 6A to 6D show an example of the radiating groove 14 formed in the spherical portion 11. It has become.
The cross-sectional shape of the radiating groove 14 provided on the spherical portion 11 side can be selectively used as the cross-sectional arc shape shown in FIG. 4A or the U-shaped cross-section shown in FIG. They can be used in combination.
The shoe 5 shown in FIG. 6A is formed with four radial grooves 14 with the through hole 13 as the center, and the width thereof is uniform, and the end of the radial groove 14 on the center side passes through. The hole 13 is reached.
The shoe 5 shown in FIG. 6 (b) has four radial grooves 14 centered on the through-hole 13 and has a uniform width. Unlike FIG. 6 (a), the shoe 5 has a central portion side. The end portion of this is not configured to reach the through hole 13.
The shoe 5 shown in FIG. 6C is a shoe 5 in which four radial grooves 14 are formed around the through hole 13, and the end of the radial groove 14 on the center side reaches the through hole 13. The width is gradually increased toward the outside.
The shoe 5 shown in FIG. 6 (d) is a shoe 5 in which four radiating grooves 14 are formed around the through-hole 13, and unlike the portion (c), the end portion on the center side of the radiating groove 14 is It does not reach the through-hole 13, and its width gradually increases toward the outside.

According to the shoe 5 in which the radiating groove 14 is formed on the inner surface of the spherical portion 11 described above, the radiating groove 14 is formed because the radiating groove 14 is thinner than other portions of the spherical portion 11. The shoe 5 can be made lighter by the amount.
As a result, it is possible to suppress the impact when the shoe 5 collides with the swash plate 3 as the piston 4 reciprocates, and it is possible to suppress wear of the coating formed on the surface of the swash plate 3.
Further, since the radiating groove 14 is formed on the inner surface of the shoe 5, the sliding contact area between the spherical surface portion 11 and the sliding surface 4a of the piston 4 is not narrower than that of the conventional shoe 5, and is the same as the conventional sliding. Dynamic performance can be obtained.
Next, by forming the radiation groove 14 on the spherical surface portion 11 side, a striking load is partially concentrated on the contact portion 11b of the spherical surface portion 11 of the shoe 5 as the piston 4 reciprocates. At this time, the spherical surface portion 11 is elastically deformed along the radiation groove 14, so that this striking load can be reduced.
Further, the spherical surface portion 11 is elastically deformed along the radiation groove 14, so that the spherical surface portion 11 is deformed so as to be adapted to the sliding surface 4 a of the piston 4, and the lubricating oil is interposed between the shoe 5 and the sliding surface 4 a. An oil film is formed and good sliding performance can be obtained.
Here, when the radiating groove 14 has an arcuate cross section as shown in FIG. 4A, the spherical portion 11 is slightly deformed while maintaining rigidity along the radiating groove 14, and even if a high compressive force is applied. It is possible to withstand this.
On the other hand, when the radiating groove 14 has a U-shaped cross section as shown in FIG. 4B, the spherical portion 11 has a large spring effect because the boundary portion between the bottom surface portion and the side surface portion is easily bent. It is possible to positively obtain the effect of reducing the load and the conformability of the spherical portion 11.
As described above, according to the shoe 5 in which the radiating groove 14 is formed in the end face portion 12, it can be used for the swash plate compressor 1 on which a high load acts.
Furthermore, the deformation state of the spherical surface portion 11 can be adjusted by changing the width of the radiation groove 14 and the shape of the end portion on the center side as shown in FIGS. Therefore, it can be appropriately selected according to the performance of the swash plate compressor 1.
In addition, arrangement | positioning of the radiation groove 14 in Fig.6 (a)-(d) is an example, For example, the number and width | variety of the radiation groove 14 can be changed.

FIG. 7 shows a sectional view of the shoe 5 in which the radiation groove 14 is formed on the inner surface of the end surface portion 12 and the inner surface of the spherical surface portion 11.
The radiating groove 14 is continuously formed from the spherical portion 11 side to the end face portion 12 side. At this time, the shape of the radiating groove 14 is the same as that of the radiating groove 14 on the end face portion 12 side shown in FIG. 6 can be appropriately combined with the radiation groove 14 on the side of the spherical surface portion 11 shown in FIG.
Thus, by providing the radiation groove 14 in both the end surface portion 12 and the spherical surface portion 11, the shoe 5 can be further reduced in weight, and the effect obtained by the radiation groove 14 formed on the end surface portion 12 side. And the effect acquired by the radiation groove 14 formed in the spherical part 11 side will be acquired simultaneously.

8 to 10 are sectional views of the shoe 5 in which the annular groove 15 as the concave portion is formed. The annular groove 15 is formed in an annular shape around the central axis of the shoe 5.
8 shows that the annular groove 15 is provided on the inner surface of the end surface portion 12, FIG. 9 shows that the annular groove 15 is provided on the inner surface of the spherical surface portion 11, and FIG. It has become.
As the annular groove 15, it is possible to use a circular arc shape in cross section of FIG. 4A and a U-shaped cross section in FIG. 4B, or a combination thereof.
In addition, a plurality of annular grooves 15 may be formed in the end surface portion 12 and the spherical surface portion 11 respectively.

According to the shoe 5 in which the annular groove 15 is formed on the inner surface of the shoe 5 shown in FIGS. 8 to 10, the annular groove 15 is formed thinner than the other parts of the end surface portion 12. The entire shoe 5 can be reduced in weight by the amount of the annular groove 15 formed.
Further, since the radiation groove 14 is formed on the inner surface of the shoe 5, the sliding contact area between the end surface portion 12 and the swash plate 3 is not narrow compared to the conventional shoe 5, and the same sliding performance as the conventional one is obtained. be able to.
Further, according to the shoe 5 in which the annular groove 15 is formed on the end surface portion 12 side shown in FIG. 8, when the shoe 5 receives a load from the swash plate 3 as the piston 4 reciprocates, the end surface portion 12 becomes the annular groove. 15 is elastically deformed.
As a result, the end surface portion 12 is deformed so as to be adapted to the swash plate 3, so that an oil film is formed by lubricating oil between the shoe 5 and the swash plate 3, and good sliding performance can be obtained.
Next, according to the shoe 5 in which the annular groove 15 is formed on the spherical portion 11 side shown in FIG. 9, when the shoe 5 receives a load from the piston 4 due to the reciprocating motion of the piston 4, the spherical portion 11 is formed in the annular groove 15. Elastically deform along.
Thereby, since the whole spherical part 11 deform | transforms so that it may adapt to the sliding surface 4a of the piston 4, the oil film by lubricating oil is formed between the shoe 5 and the piston 4, and favorable sliding performance can be obtained. .
Then, according to the shoe 5 in which the annular groove 15 is formed on the end surface portion 12 side and the spherical surface portion 11 side shown in FIG. 10, the shoe 5 can be further reduced in weight, and the annular shape formed on the end surface portion 12 side. The effect obtained by the groove 15 and the effect obtained by the annular groove 15 formed on the spherical portion 11 side are obtained at the same time.
Further, when the annular groove 15 has a circular arc shape as shown in FIG. 4A, the annular groove 15 is slightly deformed while maintaining rigidity, so that it is possible to withstand this even when a high compressive force is applied. .
On the other hand, when the radiating groove 14 has a U-shaped cross section as shown in FIG. 4B, the boundary portion between the bottom surface portion and the side surface portion of the annular groove 15 is easily bent. It is possible to positively obtain the effect of relaxing and the conformability of the sliding portion.

FIG. 11 shows the shoe 5 in which the radiation groove 14 and the annular groove 15 described above are formed in a composite manner on the inner surface of the shoe 5.
Thus, by making the radiating groove 14 and the annular groove 15 cross each other, the effects obtained by the radiating groove 14 and the annular groove 15 can be obtained in a composite manner, and matched to the performance of the swash plate compressor 1. Thus, the shape and position of the radiation groove 14 and the annular groove 15 can be used in combination.
Here, the cross-sectional shape of the radiating groove 14 or the annular groove 15 can be a circular arc shape or a U-shaped cross section shown in FIGS. 4A and 4B, and these can be used in combination. You can also

FIG. 12 shows a cross-sectional view of the shoe 5 in which the dimple 16 as the concave portion is formed, and a plurality of the dimples 16 are formed on the inner surface of the shoe 5.
The dimples 16 are arranged on the end surface portion 12 of the shoe 5 and the inner surface of the spherical portion 11 so as to be annularly aligned at equal intervals, and in particular, the sliding portion between the spherical portion 11 and the sliding surface 4 a of the piston 4. In addition, it is preferable to arrange on the inner surface on the opposite side of the sliding portion between the end surface portion 12 and the swash plate 3.
As the cross section of the dimple 16, it is possible to use an arc-shaped cross section as shown in FIGS. 4 (a) and 4 (b) or a U-shaped cross section, or a combination thereof.
The size and arrangement of the dimples 16 can be freely changed. For example, the dimples 16 may be randomly formed on the inner surface of the shoe 5.

According to the shoe 5 in which the dimple 16 is formed on the inner surface of the shoe 5 shown in FIG. 12, since the dimple 16 is formed thinner than the other parts of the shoe 5, the amount of the dimple 16 formed is the same. Only the entire shoe 5 can be reduced in weight.
Further, by arranging the dimple 16 on the inner surface of the shoe 5, when the shoe 5 receives a load from the swash plate 3 and the piston 4, the spherical surface portion 11 and the end surface portion 12 are elastically deformed along the pattern of the dimple 16.
In particular, by arranging the dimple 16 on the inner surface opposite to the sliding contact portion with the swash plate 3 or the piston 4, the spherical surface portion 11 is on the sliding surface 4a of the piston 4, and the end surface portion 12 is on the swash plate 3. Since they are elastically deformed so as to adapt to each other, an oil film is formed between the shoe 5 and the swash plate 3 and between the shoe 5 and the sliding surface 4a of the piston 4 so that good sliding performance can be obtained. it can.
In the case where the dimple 16 is formed, the degree of elastic deformation is smaller than in the case where the radiating groove 14 or the annular groove 15 is formed, but it is possible to perform elastic deformation in a more complicated pattern.

Internal structure of swash plate compressor. Sectional drawing of the shoe | hook 5 in which the radiation groove was formed in the end surface part side of internal space. The top view which shows the example of the radiation groove formed in the end surface part side. Sectional drawing which showed the cross-sectional shape of the radiation | emission groove | channel. Sectional drawing of the shoe 5 in which the radiation groove was formed in the spherical-surface part side of internal space. The top view which shows the example of the radiation groove formed in the spherical part side. Sectional drawing of the shoe 5 in which the radiation groove was formed in the end surface part side and spherical surface part side of internal space. Sectional drawing of the shoe 5 in which the annular groove was formed in the end surface part side of internal space. Sectional drawing of the shoe 5 in which the annular groove was formed in the end surface part side of internal space. Sectional drawing of the shoe 5 in which the annular groove was formed in the end surface part side of internal space. Sectional drawing of the shoe 5 in which the radial groove and the annular groove were formed in internal space. Sectional drawing of the shoe 5 in which the dimple was formed in internal space.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Swash plate type compressor 3 Swash plate 4 Piston 5 Shoe 11 Spherical surface part 12 End surface part 14 Radiation groove 15 Annular groove 16 Dimple S Internal space

Claims (19)

A spherical portion that is in sliding contact with the hemispherical sliding surface formed on the piston and a flat end surface portion that is in sliding contact with the swash plate are formed, and the spherical portion and the end surface portion are formed thin to form an internal space. In Shu
A shoe characterized in that a concave portion formed thinner on the inner surface facing the internal space is formed in comparison with other portions.   The shoe according to claim 1, wherein the recess is a radial groove formed radially about the central axis of the shoe.   The shoe according to claim 2, wherein the radiation groove is formed on a spherical surface side of the inner surface.   The shoe according to claim 2, wherein the radiation groove is formed on an end face side of the inner surface.   The shoe according to claim 2, wherein the radiation groove is formed continuously from the spherical surface side to the end surface portion side of the inner surface.   6. The shoe according to claim 2, wherein the radiation groove is formed with a constant width.   The shoe according to any one of claims 2 to 5, wherein the radiating groove is gradually widened from the central portion of the shoe toward the outside.   The shoe according to any one of claims 2 to 7, wherein the radial grooves intersect with each other at a central portion of the shoe.   The shoe according to any one of claims 2 to 7, wherein end portions of the radiation grooves are separated from each other at a central portion of the shoe.   The through hole is formed in at least one of the top part of the spherical surface part or the central part of the end surface part, and the end part of the radiation groove is formed to the opening part of the through hole. The shoe according to claim 9.   A through hole is formed in at least one of the top portion of the spherical surface portion or the central portion of the end surface portion, and the end portion of the radiation groove is formed to a position separated from the opening portion of the through hole. The shoe according to any one of claims 2 to 9.   12. The shoe according to claim 1, wherein the recess is an annular groove formed so as to surround a central axis of the shoe.   The shoe according to claim 12, wherein the annular groove is formed on a spherical surface side of the inner surface.   The shoe according to claim 12, wherein the annular groove is formed on an end surface side of the inner surface.   The shoe according to claim 12, wherein the annular groove is formed on the spherical surface side and the end surface portion side of the inner surface.   The shoe according to claim 1, wherein the recess is a dimple formed on the inner surface.   The shoe according to any one of claims 1 to 16, wherein a cross section of the concave portion has an arc shape.   The shoe according to any one of claims 1 to 16, wherein the recess has a substantially U-shaped cross section and has a bottom surface and a side surface. The cross-sectional shape is characterized in that a plurality of the concave portions are formed, and the cross-section of these concave portions is at least one of an arc shape or a substantially U-shape having a bottom surface and a side surface. Item 17. The shoe according to any one of Item 16.

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