JPS62288716A - Ball joint and its manufacture - Google Patents

Abstract

PURPOSE:To enable a lubricant of grease to improve its circulation, by providing an oil reservoir part in the ball receiving bottom part of a holder and supplying the lubricant from a vertical direction between a ball part and a ball receiving part. CONSTITUTION:A holder 1 holds in its ball receiving part 2 a ball 4a, which is cast serving as a ball part 5 of a ball-attached rod 4, while the ball receiving part 2 forms in its bottom part side an opening serving as an oil reservoir part 9, and the peripheral edge part of said opening forms a protrusive streak 10 calked when a cover member 8 is fixed. And the holder 1, in which the ball part 5 of the ball-attached rod 4 rotates and/or swivels for the ball receiving part 2, fills the inside of the opening, formed in the bottom part of the ball receiving part 2, with a lubricant of grease or the like. Accordingly, the lubricant of grease or the like improves its circulation in a lubricant pocket 13.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a ball joint and a method for manufacturing the same, and particularly relates to a ball joint having an oil reservoir at the bottom of a spherical receiving part of a holder. This invention relates to a ball joint that can obtain smooth rotational motion and rocking motion, and a method for manufacturing the same.

[Prior Art] Conventionally, this type of ball joint includes a holder equipped with a spherical receiving part on one end side and a connecting part on the other end side, and a rotating and oscillating part inside the spherical receiving part of the holder on one end side. a ball-equipped rod having a movably held spherical portion and a connecting portion on the other end side; A sealing member that accommodates a lubricant such as grease supplied between the spherical part and the spherical receiving part, and at the same time prevents dust, dirt, etc. from entering between the spherical part and the spherical receiving part. is known (for example, Special Publication No. 48-26.109
Publication No.).

In addition, the manufacturing method for such a ball joint is as follows:
For example, a sphere is set in the mold of a holder like a core, and Guicast molten alloy is cast into this mold to cast a holder in which the sphere is held in the sphere receiver. A sphere and a rod body are welded by friction welding to form a rod with a ball, the sphere part of which is held in a holder, and an external force is applied between the sphere receiving part of the holder and the sphere part of the rod with a ball. A method to improve the ball joint by forming a gap between them (Special Publication Publication No. 47
-11,002) etc.1, and in this method, a sphere with a smooth surface and high sphericity can be used as the sphere constituting the spherical part of the rod with a ball, and It is known that since the sphere receiving part of the holder can be cast using this sphere as a core, a hard chill layer can be formed on the inner surface of the sphere receiving part.

[Problems that the invention attempts to solve] However, in the ball joint described above,
If the gap between the spherical part and the spherical receiving part is increased, an impact cart may act between the two during use, and the spherical receiving part of the holder manufactured by casting may be damaged. However, if the lubricant supplied between these spherical parts and the spherical receiving part is high viscosity like grease, etc. , the lubricant sealed in the seal member does not circulate properly,
This lubricant cannot be efficiently supplied to the entire space between the spherical part and the spherical receiving part, which causes seizure and the like, especially during high-speed operation.

In addition, in the conventional manufacturing method described above, there is no means for fixing the sphere used as a core in the holder casting mold in such a way that it can be fixed in place. When casting/V-casting the alloy, this sphere may move due to the flow of the molten alloy, causing the sphere to shift its position and resulting in defective products. Casting the alloy requires skill, and this also poses a problem in terms of productivity.

Furthermore, in conventional manufacturing methods, when welding a sphere and a rod body to form a rod with a ball, the two are rotated relative to each other while pressurized to avoid contact, and the frictional heat generated at that time is utilized. They are joined by so-called friction welding, and the pressure applied between the sphere and the rod body during friction welding is high, and even if a highly spherical sphere is used, the friction welding Due to the high pressure and high frictional heat that act on the sphere, its sphericity is distorted, and when it becomes a rod with a ball, the sphericity of the spherical part has already decreased, and the sphere with high sphericity In addition to losing the meaning of using this sphere, there is also a large gap between the sphere receiving part of the holder that rotatably and swingably accommodates the sphere, and the difference between the maximum diameter and the minimum diameter of the sphere. In order to create this large gap, it becomes necessary to apply an unnecessarily large external force between the sphere part and the sphere receiver, which may accidentally damage the sphere receiver or link multiple There is a problem that when configuring a separate side, etc., a large gap accumulates between the spherical part and the spherical receiving part, resulting in a significant decrease in accuracy in force transmission, etc. If the gap between the spherical part and the spherical receiving part becomes larger than necessary due to misalignment, a large impact load will be applied between the two during use, and the spherical receiving part of the cast holder will be damaged. It was also the cause. In addition, when forming a rod with a ball by friction welding, tempering treatment after welding must be performed in a separate process.Furthermore, if welding is left for a long time before tempering, so-called placement cracks will occur in the welded part, so welding is difficult. There was a problem that tempering treatment had to be carried out as soon as possible afterwards, and furthermore, a deburring process of the welded part was also required, which restricted the manufacturing process.

Therefore, an object of the present invention is to provide a ball joint that has an oil reservoir at the bottom of the spherical receiving part of the holder and can obtain smooth rotational motion and rocking motion. In addition, the spherical part of the rod with balls has extremely high sphericity, so that it is possible to reduce the gap between the spherical part and the spherical receiving part of the holder that accommodates the spherical part. To manufacture a ball joint that can eliminate rattling between these parts and smooth their rotation and rocking motion, and also prevent large impact loads from acting between them during use. The goal is to provide a method that can be used.

[Means for solving the problem] That is, the first invention of the present application provides a holder having a spherical receiving portion on one end side and a connecting portion on the other end side, and a spherical receiving portion of the holder on one end side. In the φ ball joint, which has a spherical part that is rotatably and swingably held within the holder, and a ball-attached rod with a connecting part on the other end, the holder has a ball-attached rod at the bottom of the spherical-receiving part of the holder. A ball joint formed by a spherical support part used for fixing the holder when casting a holder using the spherical part of the rod as a core, and having an oil reservoir part to which a lid member is attached from the outside. In addition, the second invention of the present application is
A highly spherical sphere constituting a rod with a ball is set in a holder casting mold as a core of a sphere receiver, and this sphere is placed between one mold member and the sphere support of the other mold member. A die-cast molten alloy is cast into this holder casting mold to cast a holder in which the sphere is held in the sphere receiver, and the sphere held in this holder and the rod body are joined by projection welding. to form a rod with a ball whose spherical part is held in a holder, apply an external force between the spherical receiving part of the holder and the spherical part of the rod with a ball to form a gap therebetween, and This is a method of manufacturing a ball joint in which an oil reservoir is formed by attaching a lid member to an opening formed by a spherical support part of a mold member.

In the ball joint according to the first invention of the present application, the shape of the holder is such that the spherical receiving part opens in a direction substantially perpendicular to the connecting part, and the holder side and the ball The connecting parts provided on each attached rod side may be any means that can be connected to other members, such as external threads or screws, and may be the same means or different means. .

Furthermore, in this ball joint, a sealing member for storing a lubricant such as grease is provided between the ball receiving portion and the base of the connection portion of the rod with ball, and the sealing member is provided to accommodate a lubricant such as grease. The lubricant ensures smooth rotation and/or rocking movement between the spherical part and the spherical receiving part, and the sealing member prevents dust, dirt, etc. from entering between the spherical part and the spherical receiving part. This prevents smooth rotation and/or rocking motion, and prevents the lubricant from becoming dirty due to dust or dirt adhering to it. In addition, the means for fixing the lid member constituting the oil reservoir formed at the bottom of the spherical receiving part of the holder is to form a protrusion on the periphery of the opening edge to which the lid member is fixed, and caulk the protrusion. It is better to fix it.

In addition, in the second invention of the present application, the method for manufacturing a ball joint equipped with a rod with a ball having a high sphericity of the spherical part basically uses a spherical body with a high sphericity, and The sphere and the rod body may be welded together by projection welding, and although there are overlapping projection welding and other methods for this projection welding, butt projection welding is preferred.

According to this projection welding, there is little generation of welding burrs, and there is no need for cutting or the like to remove the welding burrs. Further, after the sphere and the rod body are welded by this projection welding, the welded portion can be easily tempered by applying current again in that state. As a result, for example, in high-carbon steel, if the welded part is left for a long time after welding, cracks occur in the welded part, so-called "deposition cracking". can be completely prevented.

[Function] The hole joint of the present invention has an oil reservoir at the bottom of the spherical receiving part of the holder, so that lubricant can be applied between the spherical part of the ball joint and the spherical receiving part of the holder from above and below. Therefore, the lubricant such as grease can be distributed easily, and the lubricant can be efficiently supplied between the spherical part of the ball-equipped rod and the spherical receiving part of the holder.

Further, according to the method of the present invention, since the sphere used as the core is fixed by the sphere support provided on one mold member and the other mold member, the sphere is fixed when casting the diegeast molten alloy. Since the rod body does not shift its position, and the sphere and the rod body are bonded and covered by projection welding, a ball with a high degree of sphericity is used to manufacture a lot with a ball without losing its sphericity. In addition, since the spherical receiving part of the holder is cast using this highly spherical sphere as a core, the gap between the main part of the spherical part and the spherical part can be minimized. 1. It can be made of a wooden structure that does not generate large impact loads during use.

[Example] Hereinafter, a hole joint and a manufacturing method thereof according to an example of the present invention will be specifically described based on the example shown in the accompanying drawings.

1 to 3, a ball joint according to an embodiment of the invention is shown. This ball joint consists of a holder 1 with a sphere receiving part 2 on one end (lii+) and a connecting part 3 on the other end, and a minimum necessary gap in the sphere receiving part 2 of the holder 1 on one end. A rod 4 with a ball is provided with a highly spherical spherical part 5 that is rotatably and swingably held while maintaining the spherical part 5, and a connecting part 6 on the other end side, the spherical receiving part 2 and the rod 4 with a ball. It is attached between the base of the connecting part 6 of The holder 1 has a shape in which the spherical receiving part 2 opens in a direction substantially perpendicular to the connecting part 3, and An oil reservoir 9 sealed by a lid member 8 is formed at the bottom of the spherical receiver 2 .

In this embodiment, the lid member 8 that forms the oil reservoir 9 is made of a thin disc-shaped plate, and is formed at the bottom of the spherical receiving part 2 during casting of the holder 1 to form the oil reservoir 9. It is fixed by caulking a protrusion 10 provided on the periphery of the opening. The connecting portion 3 of the holder 1 is formed with a female thread 3a, and the connecting portion 6 of the rod with a ball 4 is formed with a male thread 6a. A hexagonal tool engaging portion 11 is formed in which a tool is engaged to prevent rotation of the balled rod 4 when connecting the male thread 6a to another member, and similarly, one end of the connecting portion 3 of the holder 1 is formed. A substantially rectangular tool engaging portion 12 with which a tool engages is also formed on the holder. Furthermore, one end 7a of the seal member 7 is engaged with the tool engaging portion 11, and the other end 7b is engaged with the opening edge of the spherical receiving portion 2, forming a lubricant pocket 13 therebetween. Furthermore, the spherical receiving portion 2 of the holder 1 has a spherical receiving portion 2 at the opening edge.
An edging surface 14 is formed to restrict the swing angle of the ball-equipped rod 4 that is held and swings.

Next, regarding the "A" manufacturing method of the ball joint according to this embodiment, first the holder 1 is cast using the sphere 4a as a core, and then the sphere 4a held in the holder 1 manufactured by
This is done by projection welding the rod body 4b and the ball-attached rod 4).

That is, as shown in FIG. 4, a sphere 4a with high sphericity
is set in the holder casting mold 20 which is divided into upper and lower parts as the core of the sphere receiving part 2 when casting the holder 1, and the sphere 4a used as the core is set in the upper mold member 2.
1 and the spherical support part 23 provided on the lower mold member 22, and is fixed with /υ between the holder 1 and the spherical support part 23 provided on the lower mold member 22, and further, an inner part for forming a female screw 3a in the part constituting the connecting part 3 of the holder 1. After the child 24 is molded into the holder 1, the holder 1 is cast by casting Daiki V-stitch molten alloy into the holder casting mold 20. As shown in FIGS. 5 to 7, the thus cast holder 1 has a sphere 4a, which becomes the sphere part 5 of the ball-equipped rod 4, cast into the sphere receiving part 2 and is held therein. An opening 9a serving as an oil reservoir 9 is formed on the bottom side of the spherical receiving portion 2, and a protruding strip 10 that is caulked when fixing the lid member 8 is formed on the periphery of the mouth edge of the opening 9a. Incidentally, in this embodiment, in this state, the connection part 3 of the holder 1 is
The female thread 3a and tool engaging portion 12 are processed.

After casting the holder 1 in which the sphere 4a is cast in this way, as shown in FIG.
b are brought into contact with each other at their tips, and while applying a predetermined pressure F, a predetermined welding current is applied for a predetermined welding time to join them by projection welding, and then the current is passed again as it is for tempering. The holder 1 in which the spherical part 5 of the ball-equipped rod 4 is cast into the spherical receiving part 2 is formed. Next, the holder 1 formed in this way
Between the spherical receiving part 2 and the spherical part 5 of the rod 4 with a ball, for example, a light impact is applied by lightly tapping the outer periphery of the spherical receiving part 2, or a tensile force is applied to the rod 4 with a ball, etc. By applying an external force to form a minute gap between them, the spherical part 5 of the ball-equipped rod 4 can rotate and/or swing relative to the spherical receiving part 2 of the holder 1. , an opening 9a formed at the bottom of the sphere receiving part 2 of the holder 1
After filling the interior with a lubricant such as grease, the lid member 8 is opened by fitting the lid member 8 into the opening edge of the opening 9a and caulking the protrusion 10 formed on the periphery of the opening 9a. An oil reservoir 9 is formed by fixing it to the opening edge of 9a.

Furthermore, as shown in FIG.
A sealing member 7 is installed between the opening edge of the rod 4 and the tool engaging portion 11 provided at the base of the connecting portion 6 of the ball-equipped rod 4, and a lubricant such as grease is applied to the lubricant pocket 13 formed by the sealing member 7. Fill with agent.

[Effects of the Invention] The ball joint of the present invention can efficiently supply lubricant such as grease between the spherical part of the ball-attached rod and the spherical receiving part of the holder, and can be used during high-speed operation. It is also possible to achieve smooth rotation and rocking motion without problems such as seizure.

In addition, according to the method of the present invention, the sphere does not shift its position when die-casting the molten alloy, so there is no occurrence of defective products, and the sphere has a highly spherical spherical part. In addition, the gap between the ball receiving part and the ball part can be made to the minimum necessary size, so there is no large tT between them during use.
It is possible to manufacture a durable hole joint that is less likely to be affected by the fk cart.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a pole joint according to an embodiment of the present invention, Fig. 2 is a left side view of Fig. 1, Fig. 3 is a right side view of Fig. 1, and Fig. 4 shows a sphere inside. An explanatory diagram showing how to make a holder as a child, Fig. 5 is a front view of the part of the holder into which the sphere is cast, Fig. 6 is a right side view of Fig. 5, and Fig. 7
The figure is a plan view of Fig. 5, Fig. 8 is an explanatory diagram showing a method of joining the sphere cast in the holder and the rod body by projection welding, and Fig. 9 is a plan view of the rod body formed by projection welding as shown in Fig. 8. FIG. 2 is an explanatory cross-sectional view showing a rod with a ball and a holder. Code explanation

Claims (3)

[Claims] (1) A holder equipped with a spherical receiving part on one end side and a connecting part on the other end side, a spherical part held rotatably and swingably in the spherical receiving part of the holder on one end side, and the other end In a ball joint having a rod with a ball and a connecting portion on the side, the sphere is placed at the bottom of the spherical receiving portion of the holder when the holder is cast using the sphere constituting the spherical portion of the rod with a ball as a core. A ball joint characterized in that it is formed by a spherical support part used for fixing, and has an oil reservoir part to which a lid member is attached from the outside. (2) The ball joint according to claim 1, which uses a ball-equipped rod having a high sphericity, which is manufactured by joining the rod main body and a sphere by projection welding. (3) A highly spherical sphere constituting a rod with a ball is set in a holder casting mold as a core of a sphere receiver, and this sphere is attached to the sphere support of one mold member and the other mold member. A die-cast molten alloy is cast into this holder casting mold to cast a holder in which the sphere is held in the sphere receiver, and the sphere held in this holder and the rod body are projection welded. to form a rod with a ball whose spherical part is held in a holder, and apply an external force between the spherical receiving part of the holder and the spherical part of the rod with a ball to form a gap between them. A method of manufacturing a ball joint, comprising: attaching a lid member to an opening formed by the spherical support portion of the mold member to form an oil reservoir.