JP3044464B2 - Connection structure between main shaft and detector in dynamic balancer - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection structure between a main shaft and a detector in a dynamic balancer, and more specifically, to improve the durability of a connection portion between the main shaft and a detector. The present invention relates to a connection structure between a main shaft and a detector in a dynamic balancer having improved detection accuracy.

(Prior art)

Conventionally, a dynamic balancer in a tire testing apparatus includes a main shaft that is connected to a rim on which a tire is mounted and is driven to rotate, and a bearing member that rotatably supports the main shaft. Is connected to a bearing member to detect the vibration displacement of the main shaft.

As a structure of the connecting portion for connecting the bearing member of the main shaft and the load cell of such a dynamic balancer, for example, a structure in which the bearing member of the main shaft is directly fixed to the load cell, or, for example, as shown in FIG. Fixed to the projection 23 protruding to the outside of the bearing member 21a.
There is known a structure in which the symmetrical positions of the load cell 22 are sandwiched between the pivots 23a and 23b to detect the vibration of the main shaft and the like.

Further, as a tire testing machine that measures the displacement of the main shaft by connecting the bearing member and the load cell, a device that measures the rolling resistance of the tire by detecting the displacement due to the parallel movement of the main shaft during rotation of the tire has also been proposed. (Special Publication 56-
No. 5181).

[Problems to be solved by the invention]

However, in the connection structure between the bearing member of the main shaft and the load cell in the dynamic balancer, the main shaft vibrates so as to swing instead of moving in parallel. Torsion and vertical displacement. However, in the case of a structure in which the bearing member of the main shaft is directly fixed to the load cell as described above, vibration in the left-right direction (direction of force detection) of the main shaft is limited due to the torsional rigidity and the vertical rigidity of the load cell. Therefore, there has been a problem that a sufficient output cannot be obtained and high-precision detection cannot be performed.

Further, in the case of a structure in which the bearing member 21a of the main shaft 21 and the load cell 22 are connected by two pivots 23a and 23b as shown in FIG. 5, the tips of the pivots 23a and 23b are gradually worn to improve durability. Inferiorly, there is a problem that the detection accuracy is finally deteriorated.

Furthermore, in the case of restricting the main shaft to move in parallel during vibration as in a test machine for measuring the rolling resistance of a tire, the vibration itself of the main shaft is limited, and sufficient output cannot be obtained, and the accuracy is also high. There was a problem that detection was not possible.

[Object of the invention]

The present invention has been devised in view of such a conventional problem, and does not limit the displacement of the main shaft in a necessary range while keeping the torsional rigidity of the load cell as it is. The connection structure between the main shaft and the detector in the dynamic balancer, which can improve the detection accuracy by reducing the twist of the displacement and the interference of the vertical displacement and improve the durability of the connection part It is intended to provide.

[Means for solving the problem]

In order to achieve the above object, the present invention disposes load cells for detecting vibration displacement above and below a bearing member, disposes the bearing member and the load cell in the direction of detecting the runout of the main shaft, and can absorb the displacement of the main shaft. The gist is that they are connected by thin pin-shaped members so as to absorb a displacement harmful to measurement.

[Function of the Invention]

The present invention is configured as described above, and a thin pin-shaped member arranged in the direction of detection of the runout of the main shaft absorbs a displacement harmful to measurement of the torsion angle and the vertical displacement of the main shaft, so that the force is reduced. The feature is that it is possible to improve the detection accuracy by reducing the twist of the displacement in the left and right direction, which is the detection direction, and the interference of the displacement in the vertical direction, and also to improve the durability of the connection part. I have.

(Example of the invention)

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a sectional view of a dynamic balancer embodying the present invention, wherein 1 is a hollow main shaft, 2 is a lower rim,
Reference numeral 3 denotes an upper rim, 4 denotes a rim shaft suspended from the upper rim 3, and the lower rim 2 is connected to and supported by the hollow main shaft 1 via a hollow casing 6.

The upper rim 3 is supported so as to be able to ascend and descend through an elevating means (cylinder) (not shown). At the tip of the rim shaft 4, a locking member 5 having a multi-step locking groove 4 a is integrally formed. A chuck 7 having a substantially L-shaped cross section, which is swingably supported on the casing 6 via a pin (not shown), is configured to be engaged with and disengaged from the locking groove 4a of the locking member 5. .

Operating means 8 for opening and closing the chuck 7 includes a rod 9 slidably inserted into the hollow main shaft 1,
A locking member 10 attached to the tip of the rod 9 and a driving device 16 for vertically sliding the rod 9 are provided. The arm 1 is moved by an air cylinder 16a of the driving device 16.
6b is swung, the rod 9 is moved up and down via a locking ring 16c, and the chuck 7 is opened and closed by a locking member 10.

The main shaft 1 is rotatably supported by a bearing member 18 composed of an outer cylinder 18a and a bearing 18b suspended from the gantry 12 by a support member 17, and the lower rim 2 is provided on the upper end side of the main shaft 1 via a casing 6. Are connected, and a pulley 19 is fixed to the lower end side. The main shaft 1 and the upper and lower rims 2 and 3 are configured to be rotated by driving the pulley 19 by a driving device (not shown).

On the upper and lower portions of the outer periphery of the outer cylinder 18a, a run-out in a direction perpendicular to the paper surface of the main shaft 1 (X-axis direction in FIGS. 2 and 4)
The load cells 11a and 11b are connected to detect the load.

As shown in FIG. 2, the connection structure between the load cells 11a and 11b and the bearing member 18 of the spindle 1 is
With the base end of the outer cylinder 18 fixed to the gantry 12,
It is connected to a bracket 13 fixed to a by a thin pin-shaped member 14.

The thin pin-shaped member 14 absorbs the twist of the main shaft 1 around the Z axis (Zθ direction in FIGS. 2 and 4) and the displacement in the vertical direction (Y axis direction in FIGS. 3 and 4). It is made of a material that can be used, and is disposed in the direction of detection of the runout of the main shaft (X-axis direction).

As described above, the load cells 11a and 11b and the main shaft 1 are formed by the thin pin-shaped members 14 capable of absorbing the twist around the Z axis and the displacement in the Y direction.
As shown in FIG. 4, A ₁ -A ₂ and B ₁ -A ₂ are connected along the axis OO of the main shaft 1 as shown in FIG.
When the deflection of B _{2 in} the X direction occurs, the displacement (δ) in the Y axis direction or Z
Interference from the twist angle (θ) in the θ direction is reduced, and only the component in the X-axis direction can be efficiently extracted, so that highly accurate detection can be performed.

Compared to the conventional case where the load cell 22 and the bearing member 21a of the main shaft 21 shown in FIG. 5 are fixed, the rigidity of the load cell 22 in the Y direction (vertical direction) and θ Due to the torsional rigidity in the direction, the displacement in the X direction is limited, and a sufficient output in the X direction (measurement direction) cannot be obtained, so that it is difficult to perform highly accurate detection.

〔The invention's effect〕

According to the present invention, the bearing member of the main shaft and the load cell are disposed in the direction of detecting the run-out of the main shaft as described above, and are connected by a thin pin-shaped member capable of absorbing the displacement of the main shaft, thereby torsion and the longitudinal direction of the main shaft. Harmful to the measurement of displacement, etc., can be absorbed, so that it is possible to improve the detection accuracy by reducing the torsional and vertical displacement interference with the displacement in the left and right detection directions, and to improve the durability of the connection part. There is also an effect that can be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a dynamic balancer embodying the present invention, FIG. 2 is an enlarged plan view of a connecting portion between a spindle and a load cell, and FIG. 3 is an operation explanatory diagram when a conventional spindle and a load cell are fixed. FIG. 4 is an explanatory view of the operation when the main shaft and the load cell of the present invention are fixed, and FIG. 5 is a plan view showing the structure of a conventional connecting portion. 1 ... spindle, 11a, 11b ... load cell, 14 ... thin pin-shaped member, 18 ... bearing member.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G01M 17/02 G01M 1/16

Claims (1)

(57) [Claims] 1. A connection structure between a main shaft and a detector in a dynamic balancer for measuring a run-out of a main shaft by a vibration displacement detection load cell connected to a main shaft that is rotationally driven via a bearing member, wherein the bearing member Vibration displacement detection load cells are arranged above and below, respectively, the bearing member and the load cell are arranged in the direction of detection of the runout of the main shaft, and each is connected by a thin pin-shaped member capable of absorbing the displacement of the main shaft. A connection structure between a main shaft and a detector in a dynamic balancer, which is configured to absorb harmful displacement.