JP2009108879A - Ball type joint and throttle device provided with the same - Google Patents

Abstract

To provide a ball-type joint that is lightweight and inexpensive, can prevent backlash, and can ensure high accuracy and high reliability.
In a ball-type joint 14 in which a spherical recess 17a of a resin joint body 17 provided at an end of a rod 15 is fitted to a spherical metal pin 16, a resin piece (pressing force) is applied to the joint body 17. (Member) 18 is slidably provided, and the resin piece (pressing member) is pressed against the metal pin 16 by a leaf spring (biasing means) 19 built in the joint body 17. For example, the joint body 17 is formed integrally with the rod 15, and a U-shaped leaf spring 19 is mounted as a biasing means in a rectangular hole 20 penetrating the joint body 17.
[Selection] Figure 3

Description

  The present invention relates to a ball-type joint formed by fitting a spherical concave portion of a joint body provided at an end of a rod to a spherical metal pin, and a throttle device including the same.

  For example, in a throttle device for a V-type multi-cylinder engine, a plurality of throttle bodies that supply intake air to each cylinder are spaced apart from each other, so that the throttle valves provided in each throttle body are connected by ball joints. It is connected to each other, and a plurality of throttle valves are interlocked and simultaneously opened and closed.

  Here, an example of a conventional ball joint is shown in FIGS.

  17 and FIG. 18 are broken side views of a conventional ball joint, and the ball joint 114 shown in FIG. 17 is a pillow ball universal joint and is screwed onto the end of the rod 115. The joint body 117 is fitted to a spherical pillow ball 116 so as to be tiltable.

Also, the ball joint 214 shown in FIG. 18 is configured by fitting a spherical concave portion 217 a of a resin joint body 217 provided at the tip of a rod 215 to a spherical metal pin 216.
Japanese Utility Model Publication No. 5-057427 Japanese Utility Model Publication No. 5-0666326

  However, the conventional pillow ball type joint 114 shown in FIG. 17 is highly accurate but expensive, and because it is all made of metal, it is heavy and lacks reliability, and is light in weight. There is a problem that it is difficult.

  Further, in the conventional ball joint 214 shown in FIG. 18, since the joint body 217 is made of resin, it is difficult to ensure high accuracy, and the coefficient of thermal expansion between the joint body 217 and the metal pin 216 is difficult. There is a problem that looseness is likely to occur between the two due to the difference in thermal expansion due to the difference between the two. For example, in a throttle device in which a plurality of throttle valves are connected by a ball-type joint, if the ball-type joint is rattled, the tuning accuracy of the throttle valve will be reduced, resulting in variations in throttle opening and supply to each cylinder. The problem arises that the amount of air is non-uniform.

  The present invention has been made in view of the above problems, and the object of the process is between a ball-type joint and a cylinder that are lightweight and inexpensive, can prevent backlash and can ensure high accuracy and high reliability. An object of the present invention is to provide a throttle device capable of equalizing the amount of air supplied to each cylinder while suppressing variations in the throttle opening.

  In order to achieve the above object, the invention according to claim 1 is a ball joint formed by fitting a spherical concave portion of a resin joint body provided at an end of a rod into a spherical metal pin. A pressing member is slidably provided on the metal pin, and the pressing member is pressed against the metal pin by an urging means incorporated in the joint body.

  According to a second aspect of the present invention, in the first aspect of the invention, the joint body is formed integrally with the rod, and a U-shaped leaf spring is provided as a biasing means in a hole penetrating the joint body. It is characterized by being disguised.

  According to a third aspect of the present invention, in the first aspect of the invention, the joint body is configured separately from the rod and screwed together, and the urging means is configured by a coil spring. To do.

  According to a fourth aspect of the present invention, there is provided a ball joint formed by fitting a spherical concave portion of a joint body provided at an end portion of a rod to a spherical metal pin, wherein a part of the spherical concave portion of the joint body is the metal. The small-diameter portion is made smaller than the outer diameter of the pin, and the small-diameter portion is pressed against the metal pin by its elastic reaction force.

  A throttle device according to a fifth aspect is characterized in that a plurality of throttle valves arranged apart from each other are connected by the ball-type joint according to any one of the first to fourth aspects.

  According to the first aspect of the present invention, since the pressing member slidably provided on the joint body is pressed against the metal pin by the urging means provided in the joint body, the spherical recesses of the joint bodies that are fitted to each other. No play occurs between the spherical metal pin and the ball-shaped metal pin, and the accuracy and reliability of the ball joint can be improved. In addition, the joint body is made of a lightweight resin, so the weight can be reduced, and the simple structure of simply pressing the pressing member against the metal pin by the biasing means is adopted, simplifying the structure and reducing the cost. Can be achieved.

  According to invention of Claim 2, a joint main body and a rod can be integrally molded by casting, and the further weight reduction and cost reduction can be aimed at. And since a press member is pressed by the metal pin with the leaf | plate spring shrink | fitted by the hole of the joint main body, backlash does not generate | occur | produce in the said ball-type joint.

  According to the third aspect of the present invention, the joint body is formed separately from the rod and screwed together, and the pressing member is pressed against the metal pin by the coil spring which is the urging means, so that the joints are fitted to each other. There is no play between the spherical concave portion of the main body and the spherical metal pin, the accuracy and reliability of the ball joint can be improved, and the weight can be reduced, the structure can be simplified, and the cost can be reduced. Further, even if the pitch between the bodies changes, a resin mold is not necessary, and the mold cost can be reduced.

  According to the fourth aspect of the present invention, a small diameter portion that is smaller than the outer diameter of the metal pin is formed in a part of the spherical recess of the joint body, and the small diameter portion is pressed against the metal pin by its elastic reaction force. Therefore, no play is generated between the spherical concave portion of the joint body and the spherical metal pin that are fitted to each other, and the accuracy and reliability of the ball-type joint is improved. Further, since the small-diameter portion is integrally formed with the resin joint body, the number of parts is reduced, thereby further reducing the weight and cost.

  According to the fifth aspect of the present invention, since the plurality of throttle valves that are spaced apart from each other are connected by the ball-type joint having no backlash, the variation in the throttle opening between the cylinders is suppressed, and the throttle valve is synchronized. Accuracy is improved and the amount of air supplied to each cylinder is made uniform.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
[Throttle device]
FIG. 1 is a side view of a throttle device according to the present invention. FIG. 2 is a plan view of the throttle device. The illustrated throttle device 1 is provided in a V-type two-cylinder engine mounted on a motorcycle. And two cylindrical throttle bodies 2 arranged in a V shape. Here, the two throttle bodies 2 are respectively provided for two cylinders (not shown) forming the V shape of the engine.

  Each throttle body 2 is provided with a sub-throttle valve 3 and a main throttle valve 4 for opening and closing an intake passage connected to each cylinder of the engine, respectively. Are respectively attached to throttle shafts 5 and 6 that are rotatably supported through the throttle body 2. Throttle levers 7 and 8 are respectively connected to axial ends of the throttle shafts 5 and 6 (one end on the near side in FIG. 1), and each sub-throttle valve 3 and each main throttle valve 4 The return springs 9 and 10 wound around the outer circumferences of the throttle shafts 5 and 6 are respectively urged in the fully closed direction indicated by the solid line in FIG. Note that one end of each return spring 9, 10 is locked to the throttle body 2, and the other end is locked to each throttle lever 7, 8.

  Further, as shown in FIG. 2, an accelerator lever 11 is attached to the other axial end of the throttle shaft 6 on one cylinder side, and the throttle shaft 6 and the main throttle valve 4 attached thereto are returned. The spring 12 is biased toward the fully closed side. The accelerator lever 11 is connected to a throttle grip (not shown) via an accelerator wire (not shown). When the accelerator lever 11 is turned by a rider's accelerator operation, the throttle lever that turns together with the accelerator lever 11 is rotated. The main throttle valve 4 opens and closes the intake passage of the throttle body 2 by the shaft 6, and the amount of intake air flowing through the intake passage is controlled to adjust the engine load (engine speed). The sub-throttle valve 3 is used for controlling the intake air amount at the first idle at the time of starting the engine.

  As shown in FIG. 2, a throttle position sensor (TPS) 13 is attached to the other axial end of the throttle shaft 6 on the other cylinder side, and the throttle opening detected by the throttle position sensor 13. Is transmitted to a control unit (ECU) (not shown) for engine feedback control.

  By the way, in the throttle device 1 according to the present embodiment, the sub-throttle valves 3 and the main throttle valves 4 of the two cylinders are respectively connected by the ball joint 14 and the rod 15 according to the present invention. Are synchronized with each other and are simultaneously opened and closed by the same amount.

Accordingly, the throttle lever 8 can be rotated in conjunction with the rider's accelerator operation from the fully closed position shown by the solid line in FIG. 1 to the fully open position shown by the chain line, and the two main throttle valves 4 can be moved from the fully closed position. The intake amount supplied to each cylinder of the engine is controlled by opening and closing the same amount at the same time in synchronization with the fully open range.
[Ball type joint]
Next, the ball joint 14 according to the present invention will be described. Since the four ball joints 14 have the same configuration, only one ball joint 14 will be described below.

<Embodiment 1>
3 is a side sectional view of the ball joint according to Embodiment 1 of the present invention, FIG. 4 is a sectional view taken along line AA of FIG. 3, FIG. 5 is a plan view of the ball joint, and FIG. FIG. 7 is an exploded perspective view of the ball joint before the plate spring of the joint is assembled.

  The ball joint 14 according to the present embodiment is provided at the end of the rod 15 on a spherical metal pin 16 bound to the end of, for example, the throttle lever 8 of the throttle device 1 shown in FIGS. It is configured by fitting a spherical concave portion 17a formed in the resin joint body 17, and a resin piece 18 as a pressing member is provided on the joint body 17 so as to be slidable in the axial direction of the rod 15. The resin piece 18 is pressed against the metal pin 16 by a plate spring 19 which is an urging means built in the joint body 17.

  That is, in the present embodiment, the joint body 17 is integrally formed with the rod 15 with resin, and the joint body 17 has a rectangular hole 20 in a direction perpendicular to the axis of the rod 15 (see FIG. 6). A guide hole 21 is provided in the axial direction of the rod 15 (left and right direction in FIG. 1). The guide hole 21 communicates with the rectangular hole 20 and the spherical recess 17a. As shown in FIG. 6, an opening 17 b that opens downward in FIG. 3 is formed in the lower half of the joint body 17 between the spherical recess 17 a and the rectangular hole 20. The guide hole 21 is open to the opening 17b. Further, as shown in FIGS. 6 and 7, a rectangular protrusion 17 c for preventing the removal is integrally provided in the rectangular hole 20 of the joint body 17.

  On the other hand, as shown in FIG. 7, the resin piece 18 includes a rectangular block-shaped shaft portion 18a and a rectangular flange-shaped stopper portion 18b integrally formed on the end surface of the shaft portion 18a. The joint body 17 is assembled from the opening 17b. That is, as shown in FIG. 3, the resin piece 18 has a shaft portion 18 a slidably fitted into the guide hole 21 of the joint body 17, and the stopper portion 18 b faces the rectangular hole 20.

  The plate spring 19 is formed by bending spring steel into a U-shape, and a receiving portion 19a bent in an arc shape toward the outside is formed at one end of two forked portions. A rectangular fitting hole 19b (see FIGS. 4 and 7) is formed at the center in the width direction of the lower part of the other piece.

  Thus, the leaf spring 19 is inserted from the lower side of FIG. 3 into the rectangular hole 20 of the joint body 17 with the U-shaped portion first, with the left and right pieces pressed inward and the width reduced. When the force holding the leaf spring 19 is released with the U-shaped portion at its tip protruding as shown in FIG. 3, the leaf spring 19 is sandwiched in the rectangular hole 20 to spread by elastic restoring force. The projection 17c projecting from the rectangular hole 20 of the joint body 17 is fitted into the fitting hole 19b formed in the fitting hole 19b (see FIG. 4). Dropping is prevented.

  As described above, when the plate spring 19 is incorporated into the rectangular hole 20 of the joint body 17, the resin piece 18 with which the stopper portion 18 b abuts against the plate spring 19 is urged toward the metal pin 16 by the plate spring 19. The shaft portion 18a is pressed against the outer periphery of the metal pin 16 with a predetermined force. At this time, as shown in FIG. 3, the illustrated gap L is formed between the stopper portion 18 b of the resin piece 18 and the inner surface of the rectangular hole 20. Further, since the lower portion of the stopper portion 18b of the resin piece 18 is received by the receiving portion 19a of the leaf spring 19, the resin piece 18 is prevented from falling off from the joint body 17.

  Thus, in the ball-type joint 14 according to the present embodiment, the resin piece 18 slidably provided on the joint body 17 is pressed against the metal pin 16 by the leaf spring 19 that is contracted to the joint body 17. Therefore, backlash does not occur between the spherical recess 17a of the joint body 17 and the spherical metal pin 16 that are fitted to each other, and the accuracy and reliability of the ball joint 14 is improved.

  In the ball-type joint 14 according to the present embodiment, the joint body 17 and the rod 15 are integrally formed of a lightweight resin, so that the weight can be reduced and the resin piece 18 is simply attached to the metal pin 16 by the leaf spring 19. Therefore, the structure can be simplified and the cost can be reduced.

  Further, in the present embodiment, since the gap L shown in FIG. 3 is formed between the stopper portion 18 b of the resin piece 18 and the inner surface of the rectangular hole 20, the resin piece 18 is slid by sliding with the metal pin 16. Even if it is worn slightly, the resin piece 18 comes into contact with the metal pin 16, so that the play between the spherical concave portion 17a of the joint body 17 and the spherical metal pin 16 can be prevented for a long time.

  Accordingly, as shown in FIGS. 1 and 2, the throttle device 1 is formed by connecting the sub-throttle valves 3 and the main throttle valves 4 that are spaced apart from each other by a ball-shaped joint 14 and a rod 15 that are free of backlash. , The variation in the throttle opening between the cylinders is suppressed, the tuning accuracy of the sub-throttle valve 3 and the main throttle valve 4 is increased, the amount of air supplied to each cylinder is made uniform, and the rotational stability of the engine is increased. It is done.

  In the ball joint 14 according to the present invention, since the resin piece 18 is constantly pressed against the metal pin 16 by the leaf spring 19, a frictional resistance is generated between the two, and this frictional resistance causes the rider to operate the accelerator. Desired hysteresis can be given to the operation load characteristics in the opening direction (in which the accelerator opening increases) and in the closing direction (in which the accelerator opening decreases).

  Here, FIG. 8 shows the operating load characteristics in the opening direction and the closing direction with respect to the accelerator opening. In the accelerator operation in the opening direction, the return spring 12 (see FIG. 2) is shown as shown by a straight line a in FIG. The operation load against the urging force increases as the accelerator opening increases, and when the rider releases the force that the rider operated the throttle grip from the fully open accelerator opening, the throttle grip has a characteristic indicated by a straight line b in FIG. It returns to the fully closed direction by the urging force of the return spring 12 that decreases along the direction.

  However, in the throttle device 1 employing the ball joint 14 according to the present embodiment, a frictional resistance is generated between the resin piece 18 and the metal pin 16 as described above. The operation load characteristic when returning to the fully closed direction by the urging force of the spring 12 is improved as shown by a straight line c in FIG. 8, and the operation load characteristics in the opening direction and the closing direction of the rider's accelerator operation have a desired magnitude. Hysteresis can be provided.

  By the way, in this embodiment, the joint body 17 is integrally formed with the resin together with the rod 15. However, as shown in FIGS. 9 to 11, the joint body 27 made of resin is connected to the end of the metal rod (plate material) 25. You may make it attach to a part by crimping.

  9 is a side sectional view of a ball type joint showing a modification of the present embodiment, FIG. 10 is a bottom view of the ball type joint, and FIG. 11 is a state before the body joint of the ball type joint is attached to the rod. In these drawings, the same components as those shown in FIGS. 3 to 7 are denoted by the same reference numerals, and the repetitive description thereof will be omitted below.

  In the present embodiment, as shown in FIG. 11, a rectangular fitting recess 27a is formed in the resin joint body 27, and a cylindrical positioning boss 27b and a caulking boss 27c are integrally formed in the fitting recess 27a. In addition, circular holes 25a and 25b having large and small diameters are formed at the end of a rod 25 made of a metal plate.

  Thus, as shown in FIG. 10, the end of the rod 25 is fitted into the fitting recess 27a of the joint body 27, and the positioning boss 27b of the joint body 27 is fitted into the circular hole 25b on the small diameter side of the rod 25. After positioning the joint body 27 and the rod 25, the caulking boss 27c of the joint body 27 is fitted into the circular hole 25a on the large-diameter side of the rod 25, and as shown in FIG. By crushing the head of the boss 27c, the joint body 27 can be attached to the rod 25 by caulking. When the joint body 27 and the rod 25 are integrally formed, a mold is required each time the pitch between the bodies changes, which is disadvantageous in terms of cost. As described above, the caulking type has the advantage that the mold cost is unnecessary.

<Embodiment 2>
Next, a ball joint according to Embodiment 2 of the present invention will be described with reference to FIGS.

  FIG. 12 is a side sectional view of a bol type joint according to Embodiment 2 of the present invention, and FIG. 13 is a perspective view of a resin piece.

  The ball-type joint 34 according to the present embodiment is configured such that the joint body 37 is formed separately from the rod 35 and both are screwed together, and the resin piece 38 as a pressing member is metalized by a coil spring 39 as an urging means. The pin 36 is pressed.

  That is, as shown in FIG. 12, a screw hole 37b is formed in the joint body 37, and a circular guide hole 31 connected to the spherical concave portion 37a is provided in the back of the screw hole 37b. . A threaded portion 35a is formed at the end of the round rod-shaped rod 35, and a lock nut 40 is screwed into the threaded portion 35a.

  Further, as shown in FIG. 13, the resin piece 38 is integrally constituted by a columnar shaft portion 38a, a flange-shaped stopper portion 38b, and a columnar spring guide portion 38c.

  Thus, when the ball joint 34 is assembled, the resin recess 38 is assembled into the joint body 37 after the spherical recess 37 a of the joint body 37 is fitted into the metal pin 36. At this time, the shaft portion 38 a of the resin piece 38 is slidably fitted into the guide hole 31 of the joint body 37, and the stopper portion 38 b and the spring guide portion 38 c face the joint body 37.

  Thereafter, the coil spring 39 is assembled into the screw hole 37b of the joint body 37, the screw portion 35a at the end of the rod 35 is screwed into the screw hole 37b, and finally the lock nut 40 is tightened to connect the joint body 37 and the rod 35. Then, the assembly of the ball joint 34 is completed. At this time, as shown in FIG. 12, a gap L shown in the figure is secured between the stopper portion 38b of the resin piece 38 and the step portion of the guide hole 21 of the joint body 37.

  Thus, also in the ball-type joint 34 according to the present embodiment, the resin piece 38 slidably provided on the joint body 37 is pressed against the metal pin 36 by the coil spring 39 that is mounted on the joint body 37. Therefore, no play is generated between the spherical concave portion 37a of the joint body 37 and the spherical metal pin 36 which are fitted to each other, and the accuracy and reliability of the ball-type joint 34 are improved.

  In the ball joint 34 according to the present embodiment, a gap L shown in FIG. 12 is secured between the stopper portion 38b of the resin piece 38 and the step portion of the guide hole 31 of the joint body 37. Even if the resin piece 38 is somewhat worn due to sliding with the metal pin 36, the resin piece 38 comes into contact with the metal pin 36, so that the backlash between the spherical recess 37 a of the joint body 37 and the spherical metal pin 36 is not good. Is prevented over a long period of time.

<Embodiment 3>
Next, a ball joint according to Embodiment 3 of the present invention will be described with reference to FIG.

  FIG. 14 is a side sectional view of a ball joint according to Embodiment 3 of the present invention. In this figure, the same elements as those shown in FIG. The description will not be repeated.

  The ball-type joint 44 according to the present embodiment is the ball-type joint according to the above-described embodiment except that the ball 48 is used instead of the resin piece 38 of the second embodiment as a pressing member pressed against the metal pin 36. The configuration is the same as 34. In the present embodiment also, the illustrated gap L is secured between the ball 48 and the step portion of the guide hole 31 of the joint body 37.

  Therefore, also in the present embodiment, the same effect as in the second embodiment can be obtained, and no play is generated between the spherical concave portion 37a of the joint body 37 and the spherical metal pin 36 which are fitted to each other. The accuracy and reliability of the ball joint 44 can be improved.

<Embodiment 4>
Next, a ball joint according to Embodiment 4 of the present invention will be described with reference to FIGS. 15 and 16.

  FIG. 15 is a side sectional view of a ball joint according to Embodiment 4 of the present invention, and FIG. 16 is a bottom view of the joint body of the ball joint.

  In the ball-type joint 54 according to the present embodiment, a part of the spherical recess 57a of the joint body 57 is cut out, and a small-diameter part 57A that is smaller than the outer diameter of the metal pin 56 is integrally formed in the cut-out part. The small-diameter portion 57A is pressed against the metal pin 56 by its elastic reaction force.

  Therefore, according to the ball-type joint 54 according to the present embodiment, the small-diameter portion 57A that is smaller than the outer diameter of the metal pin 56 is formed in a part of the spherical concave portion 57a of the joint body 57, and the small-diameter portion 57A is formed. Since the elastic reaction force presses the metal pin 56, no play occurs between the spherical recess 57a of the joint body 57 and the spherical metal pin 56 that are fitted to each other. Accuracy and reliability are improved. Further, since the small-diameter portion 57A is integrally formed with the resin joint body 57, the number of parts is reduced, and further weight reduction and cost reduction are achieved.

  In the above embodiment, the embodiment in which the present invention is applied to a ball-type joint that connects throttle valves of a throttle device provided in a V-type two-cylinder engine has been described. Of course, the present invention can be similarly applied to a throttle device provided in an arbitrary engine other than the engine and a ball joint provided in an arbitrary device other than the throttle device.

1 is a side view of a throttle device according to the present invention. It is a top view of the throttle device concerning the present invention. It is a sectional side view of the ball type joint concerning Embodiment 1 of the present invention. FIG. 4 is a sectional view taken along line AA in FIG. 3. It is a top view of the ball type joint concerning Embodiment 1 of the present invention. It is a bottom view before incorporating the leaf | plate spring of the ball-type joint which concerns on Embodiment 1 of this invention. It is a disassembled perspective view of the ball-type joint which concerns on Embodiment 1 of this invention. It is a figure which shows the operation load characteristic of the opening direction and closing direction of a throttle device with respect to an accelerator opening. It is a sectional side view of the ball type joint which shows the modification of this Embodiment. It is a bottom view of a ball type joint which shows a modification of this embodiment. It is a sectional side view which shows the state before attaching the main body joint of the ball-type joint which shows the modification of this Embodiment to a rod. It is a sectional side view of the Bol type joint concerning Embodiment 2 of the present invention. It is a perspective view of the resin piece of the Bol type joint concerning Embodiment 2 of the present invention. It is a sectional side view of the ball type joint concerning Embodiment 3 of the present invention. It is a sectional side view of the ball type joint concerning Embodiment 4 of the present invention. It is a bottom view of the joint main body of the ball-type joint which concerns on Embodiment 4 of this invention. It is a fracture side view of the conventional ball type joint. It is a fracture side view of the conventional ball type joint.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Throttle device 2 Throttle body 3 Sub throttle valve 4 Main throttle valve 5, 6 Throttle shaft 7, 8 Throttle lever 9, 10 Return spring 11 Acceleration lever 12 Return spring 13 Throttle position sensor (TPS)
14, 34, 44, 54 Ball joint 15, 25, 35 Rod 16, 36, 56 Metal pin 17, 27, 37, 57 Joint body 17a, 27a, 37a, 57a Spherical recess 18 of joint body 18, 38 Resin piece ( Press member)
18a, 38a Resin piece shaft 18b, 38b Resin piece stopper 19 Plate spring 19a Plate spring receiving portion 19b Plate spring fitting hole 20 Rectangular hole 21, 31 Guide hole 27b Positioning boss 27c Caulking boss 35b Rod Screw part 37b Joint body screw hole 38c Resin piece spring guide part 39 Coil spring (biasing means)
40 Lock nut 48 Ball (Pressing member)
57A Small diameter part of joint body L Clearance

Claims (5)

In a ball joint formed by fitting a spherical concave portion of a resin joint body provided at an end of a rod to a spherical metal pin,
A ball-type joint, wherein a pressing member is slidably provided on the joint body, and the pressing member is pressed against the metal pin by an urging means built in the joint body.   2. The ball mold according to claim 1, wherein the joint body is formed integrally with the rod, and a U-shaped leaf spring is mounted as a biasing means in a hole penetrating the joint body. Joint.   2. The ball-type joint according to claim 1, wherein the joint body is constructed separately from the rod and screwed together, and the biasing means is constructed of a coil spring. In the ball-type joint formed by fitting the spherical concave portion of the joint body provided at the end of the rod to the spherical metal pin,
A ball-type joint characterized in that a part of the spherical concave portion of the joint body is a small-diameter portion that is smaller than the outer diameter of the metal pin, and the small-diameter portion is pressed against the metal pin by its elastic reaction force.   A throttle device characterized in that a plurality of throttle valves arranged apart from each other are connected by the ball-type joint according to any one of claims 1 to 4.

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