JP2554029B2 - Plain bearing - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plain bearing having a pressure pad.

[0002]

2. Description of the Related Art A pressure pad in a conventional plain bearing has a cylindrical pin inserted into a hole of a carrier,
The pin is fixed in the carrier bore by a spring ring or toothed ring fitted on the pin. There is also known a slide bearing including both a toothed ring and a spring ring, and the spring ring prevents the toothed ring from sliding out of the pin. The holes in the carrier prevent unwanted lateral movement of the pressure pad. The spring ring or toothed ring prevents the pressure pad from escaping from the bore during assembly or disassembly of the plain bearing. The spring ring and / or the toothed ring are fitted in an annular groove in the pin of the pressure pad.

[0003]

However, it is difficult to fit the spring ring (also called a snap ring) and the toothed ring in the above-mentioned conventional slide bearing to the pin of the pressure pad. The larger the diameter of these rings, the more difficult it is to fit the pins of the pressure pad. These rings expand significantly when fitted to the pins of the pressure pad, which can lead to permanent corrugation in the circumferential direction. Spring rings and toothed rings make it difficult to insert the pin into the hole, especially when it is significantly distorted by being fitted to the pin, and also prevent free tilting of the pressure pad during use. Become. As a result, the formation of an oil wedge between the pressure pad and the opposing member is impaired. This oil wedge is essential for obtaining sufficient lubrication. Spring and toothed rings of very large diameter cannot be fitted on the pins, in which case a flat head screw must be screwed onto the free end of each pin. The flat head screw is provided with a cap on which a spring ring or toothed ring is fitted so that the spring ring or toothed ring is retained between the flat head of the screw and the end face of the pin of the pressure pad. Of.

The present invention has been made in order to solve the above-mentioned problems in the conventional slide bearing. That is, the present invention simplifies the assembly of the pressure pad, allows the pressure pad to be assembled more quickly and without the use of special tools, and allows the bearing to function regardless of the size of the pressure pad. It was done in an attempt to prevent damage.

[0005]

In order to solve the above problems, the present invention comprises an annularly arranged pressure pad, each pressure pad having a cylindrical pin to be inserted into a hole of a carrier. However, in the plain bearing in which the pin is prevented from coming out of the hole of the carrier by at least one ring member fitted to the pin, the hole of the carrier has a diameter larger than that of the pin. The pressure pads are tiltable in the play caused by the difference between
The at least one ring member is provided with an elastic member such as rubber, to provide a plain bearing (claim 1).

The pressure pad preferably has a cylindrical shape and a circular slip surface, but the pressure pad and its slip surface may have other shapes.
The cylindrical pressure pad is independent of the direction of rotation, and thus the thrust bearing with the cylindrical pressure pad has the advantage that it can be used in both directions of rotation. The pressure pad is preferably supported on the carrier via a spring member such as a cup spring. By doing so, all the pressure pads are mounted so that they are used almost evenly even if there are manufacturing variations.
The thrust bearing provided with the pressure pad can be automatically lubricated by, for example, immersion lubrication or ring lubrication, but pressure lubrication is also possible. The lubricating oil can be cooled, in which case it also serves as a coolant. The hole of the carrier for receiving the pin of the pressure pad may be a through hole, or may be a non-through hole (claim 6).

If the holes of the carrier are non-through holes,
A passage is formed for communicating the portions in the hole divided by the ring member with each other. This passage may be formed by using the ring member as a split ring (Claim 2), but may also be formed by providing a substantially axial hole or groove in the ring member. That is, the two parts in the hole of the carrier, which are prevented from communicating with each other by the ring member, communicate with each other by at least one passage across the ring member or a passage formed in the ring member. 5). Such a passage could be formed in the carrier of the pressure pad, but this would be more expensive than forming the passage in the ring member itself.

Further, the ring member is fitted in the annular groove of the pin, and the ring member projects outside the diameter of the pin when not pressed, and the pin is inserted into the hole of the carrier. When the ring member is pressed, it is desirable that the ring member be compressed into the annular groove by the wall surface of the hole (claim 3).

[0009]

[Action]

[Slide bearing according to claim 1] In the slide bearing according to claim 1, the hole of the carrier has a diameter larger than that of the pin, and each pressure pad can be tilted in the play caused by the difference in diameter. By tilting each pressure pad in this way, an oil film or oil wedge (wedge-shaped oil film) is formed between the contact surface of the pressure pad and the sliding surface of the opposing member supported by the pressure pad. This oil film or oil wedge is always maintained during use. The ring member is formed of an elastic member such as rubber. Such a ring member can be fitted to the pin of the pressure pad without the use of special tools, unlike the case of a spring ring or a toothed ring. The ring member formed of an elastic member such as rubber is not likely to be deformed even if it has a large diameter. By the way, when the ring member is deformed, it has an adverse effect on the use of the pressure pad.

The ring member can be formed to have any diameter, and any diameter can be easily fitted to the pin of the pressure pad.

[Slide bearing according to claim 2] Since the ring member in the slide bearing according to claim 2 is a split ring, portions inside the holes on both sides of the ring member communicate with each other. That is, the split portion of the split ring acts as a passage for communicating the portions in the holes on both sides thereof with each other. The passages allow the passage of lubricating oil. If the hole in the carrier is a non-through hole that does not penetrate the carrier, the passage serves to allow air to escape from the hole when the pin is inserted into the hole. Furthermore, the split ring is easily opened, so that the split ring can be very easily fitted on the pin.

[Slide bearing of claim 3] The ring member in the slide bearing of claim 3 easily slides into the hole of the carrier and does not adversely affect the free tilting of the pressure pad. Since the ring member has a large frictional force in the hole, the pressure pad is prevented from coming out of the hole during assembly.

[Slide bearing according to claim 4] In the slide bearing according to claim 4, the two parts in the hole of the carrier, which are prevented from communicating with each other by the ring member, are formed by at least one passage that crosses the ring member. Communicate with each other. The passages allow the passage of lubricating oil. If the hole in the carrier is a non-through hole that does not penetrate the carrier, the passage serves to allow air to escape from the hole when the pin is inserted into the hole.

[Slide bearing of claim 5] In the slide bearing of claim 5, the two parts in the hole of the carrier, which are prevented from communicating with each other by the ring member, are formed by the passage formed in the ring member. Communicate with each other. Forming the passage in the ring member provides cost savings over forming the passage in the carrier of the pressure pad.

[Slide bearing of claim 6] In the slide bearing of claim 6, since the hole of the carrier is a non-through hole that does not penetrate the carrier, it is advantageous in terms of strength of the carrier.

[0016]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The thrust slide bearing of the present invention shown in FIGS. 1, 2, and 3 includes a carrier ring 2. The carrier ring 2 carries a plurality of pressure pads 4 and a pressure ring 6. The pressure ring 6 is arranged axially opposite the carrier ring 2 and has an annular contact surface 8. The contact surface 8 is a circular contact surface 10 of the pressure pad 4.
Is in contact with The pressure ring 6 rotates relative to the carrier ring 2. By tilting the pressure pad 4, an oil film wedge (wedge-shaped oil film) is formed between the contact surface 10 of the pressure pad 4 and the contact surface 8 of the pressure ring 6.

FIG. 1 shows one of the pressure pads 4 in an enlarged scale as compared with FIGS. 2 and 3. The pressure pad 4 is supported on the carrier ring 2 by a leaf spring or a cup spring 12. Therefore, for example, due to dimensional variations in the manufacturing process, uneven utilization of the material, or misalignment between the carrier ring 2 and the pressure ring 6, the contact surface 8 of the pressure ring 6 and the carrier ring 2 may be separated. Even when the distances between the pressure pads 4 are not uniform, almost equal pressure distributions are obtained for all the pressure pads 4.

Each pressure pad 4 comprises a pin 14,
The leaf spring 12 is attached to the pin 14. Each pin 14 is inserted in a hole 16 in the carrier ring 2.
The diameter of the hole 16 is larger than the diameter of the pin 14. Therefore,
The pressure pad 4 can tilt in the play caused by the difference in diameter. The pin 14 may be integrally formed with the pressure pad head 17 having the contact surface 10 on the surface, but the pin 14 may be fixed to the pressure pad head 17. An O-ring 20 formed of rubber or a rubber-like elastic member is fitted into the annular groove 18 of the pin 14. The O-ring 20 projects outside the diameter of the pin 14 in the unpressurized state, but the O-ring 20 is in contact with the annular groove 1 due to the wall surface of the hole 16 in the used state as shown in FIG.
Compressed within 8. The O-ring 20 holds the pressure pad 4 in the hole 16.

When the hole 16 is not a through hole penetrating the thickness of the carrier ring 2 but a non-through hole as shown in FIG.
An air cushion is created which tends to push the holes out of the hole 16. In order to allow the air of the air cushion to escape to the outside, at least one passage 22 for communicating the portions 24 and 25 of the hole 16 in which the air flows are mutually blocked by the O-ring 20 is provided. It is provided.
The passage 22 may be a hole or a groove formed in the O-ring 20, but may be a broken portion (split portion) such as a notch that interferes with the annular shape of the O-ring 20. The passage 22 formed in the O-ring 20 is schematically shown in FIG.
The pressure pad 4 and its pin 14 are formed symmetrically with respect to the hole axis 26, and the pressure pad 4 and its pin 14 are preferably cylindrical.

The drawing shows a thrust plain bearing. The carrier ring 2 and the pressure ring 6 rotate relatively about the bearing axis 28. In a variant of the invention, the plain bearing of the invention can also be formed as a radial bearing.

[0021]

【The invention's effect】

[Slide bearing according to claim 1] In the slide bearing according to claim 1, since each pressure pad is tiltable in a play caused by the difference between the diameter of the hole of the carrier and the diameter of the pin, the contact surface of the pressure pad An oil film or oil wedge (wedge-shaped oil film) is formed between and the sliding surface of the opposing member supported by the pressure pad, and the oil film or oil wedge is always maintained during use. Further, since the ring member is formed of an elastic member such as rubber, unlike the case of the spring ring or the toothed ring, the ring member can be fitted to the pin of the pressure pad without using a special tool. . The ring member formed of an elastic member such as rubber is not likely to be deformed even if it has a large diameter.

[Slide bearing of claim 2] Since the ring member in the slide bearing of claim 2 is a split ring, portions in the holes on both sides of the ring member communicate with each other. That is, the split portion of the split ring functions as a passage for communicating the portions in the holes on both sides thereof with each other. The passages allow the passage of lubricating oil. If the hole in the carrier is a non-through hole that does not penetrate the carrier, the passage serves to allow air to escape from the hole when the pin is inserted into the hole. Furthermore, the split ring is easily opened, so that the split ring can be very easily fitted on the pin.

[Slide bearing of claim 3] The ring member in the slide bearing of claim 3 easily slides into the hole of the carrier and does not adversely affect the free tilting of the pressure pad. Since the ring member has a large frictional force in the hole, the pressure pad is prevented from coming out of the hole during assembly.

[Slide bearing according to claim 4] In the slide bearing according to claim 4, the two portions in the hole of the carrier, which are prevented from communicating with each other by the ring member, are formed by at least one passage that crosses the ring member. Communicate with each other. The passages allow the passage of lubricating oil. If the hole in the carrier is a non-through hole that does not penetrate the carrier, the passage serves to allow air to escape from the hole when the pin is inserted into the hole.

[Slide bearing of claim 5] In the slide bearing of claim 5, the two parts in the hole of the carrier, which are prevented from communicating with each other by the ring member, are formed by the passage formed in the ring member. Communicate with each other. Forming the passage in the ring member provides cost savings over forming the passage in the carrier of the pressure pad.

[Slide bearing of claim 6] In the slide bearing of claim 6, since the hole of the carrier is a non-through hole that does not penetrate the carrier, it is advantageous in terms of strength of the carrier.

[Brief description of drawings]

FIG. 1 is a side view of a pressure pad inserted in a non-through hole of a carrier. The carrier is shown as a cross-sectional view with a part cut away.

2 is a front view of a carrier showing a plurality of pressure pads in the thrust bearing of FIG. 1. FIG.

3 is a side view showing the thrust bearing of FIGS. 1 and 2. FIG.

[Explanation of symbols]

 2 carrier ring 4 pressure pad 6 pressure ring 8 contact surface 10 contact surface 12 leaf spring or cup spring 14 pin 16 hole 17 pressure pad head 18 annular groove 20 O-ring 22 passage 26 axis line 28 bearing axis line

Claims (6)

(57) [Claims] 1. A pressure pad arranged in an annular shape, each pressure pad having a cylindrical pin to be inserted into a hole of a carrier, the pin being at least one ring fitted to the pin. In a slide bearing in which the carrier is prevented from escaping from the hole, the carrier hole has a larger diameter than the pin, and the pressure pads are tiltable in the play caused by the difference in diameter. Yes,
A slide bearing, wherein the at least one ring member is formed of an elastic member such as rubber. 2. The slide bearing according to claim 1, wherein the ring member is a split ring. 3. The ring member is fitted in an annular groove of the pin, and the ring member projects outside the diameter of the pin when not pressed, and the pin is inserted into the hole of the carrier. 3. The sliding bearing according to claim 1, wherein the ring member is compressed into the annular groove by the wall surface of the hole when the sliding member is pressed. 4. The two parts in the hole of the carrier, which are blocked from communicating with each other by the ring member, are connected to each other by at least one passage across the ring member. A sliding bearing of either 2 or 3. 5. The plain bearing according to claim 4, wherein the passage is formed in the ring member. 6. The carrier hole is a non-through hole that does not penetrate the carrier.
One of the plain bearings.