JPH08170902A - Gauge for measuring inside diameter at crescent part - Google Patents

Abstract

PURPOSE: To obtain a gauge for measuring the inside diameter at a recessed part having a crescent cross-section directly with high accuracy while simplifying the structure. CONSTITUTION: A contact member 1 insertable into a crescent part 6 is provided with two fixed contactors 12 which can come into contact simultaneously with the inside surface 6a thereof. A spindle 2 is passed, slidingly in the axial direction, through the contact member 2 and provided, at the forward end thereof, with a movable contactor 10 which can come into contact with the inside surface 6a of the crescent part 6. The spindle 2 is provided, at the rear end thereof, with a gauge part 3 for indicating the distance being advanced by the spindle 2 before coming into contact with the inside surface 6a of the crescent part 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gauge for precisely measuring the inner diameter of a half-moon portion recessed in a semicircular cross section.

[0002]

2. Description of the Related Art In a transmission of an automobile, as shown in FIG. 3, one end of a fixed shaft (20) is integrally formed with an inner surface of a transmission case (21) into a half-moon shaped half-moon (22). There is a case where they are fitted and the one end is fixed to the meniscus (22) using a bolt (23) or the like.

The inner diameter surface (24) of the half-moon portion (22) is machined to finish after casting the mission case (21), but since an error in processing is unavoidable, the inner diameter surface (24). There is a slight variation in the finished dimensions, but there are variations. Therefore, it is necessary to individually inspect whether the inner diameter of the half-moon portion (22) is within a predetermined tolerance after the completion of processing and before the conveyance to the next step.

As a means for measuring the inner diameter of the half-moon portion (22), measurement with an air gauge can be considered. That is, a rod-shaped body having a predetermined diameter is fitted into the shaft hole (25) of the half-moon portion (22), and air is ejected from the outer peripheral surface of the tip end portion of the rod-shaped body to determine the inner diameter of the half-moon portion (22) from the air leak condition. Is measured.

[0005]

However, as shown in the drawing, the half-circumferential portion of the shaft hole (25) of the half-moon portion (22) is open to the internal space of the mission case (21), and the half-moon portion ( In the situation where the inner diameter surface of 22) communicates with the outside of the mission case (21) through the bolt through hole (26), a large amount of air escapes, so highly accurate measurement cannot be expected.
Further, there is a drawback that the equipment becomes large in scale because an air supply source, an air supply pipe, etc. are required.

In addition, Komeitan is applied to the outer diameter surfaces of the two shaft members having different diameters, and both shaft members are sequentially pressed against the half-moon portion (22) to form the half-moon inner diameter surface (24) of both shaft members. It is also possible to inspect the inner diameter from the difference in the contact condition with), but with this method it is only possible to determine whether the inner diameter of the meniscus (22) is within a certain tolerance, and the inner diameter itself It cannot be measured directly. Therefore, when the defective product is subjected to the finishing process again, the reworking becomes difficult because the required cutting amount is not clear.

Therefore, an object of the present invention is to provide a measuring gauge having a simple structure capable of directly and accurately measuring the inner diameter of the half-moon portion.

[0008]

[Means for Solving the Problems] To achieve the above object,
A measuring gauge according to the present invention is a gauge for measuring an inner diameter of a half-moon portion which is recessed in a substantially semicircular cross section, and is known in the art.
A pair of fixed contacts provided at each point and capable of contacting simultaneously with the inner diameter surface of the meniscus, and capable of contacting with the inner diameter surface of the meniscus, between a contact position with the inner diameter surface and a position separated from the inner diameter surface. It is provided with one movable contact which is movable, and a gauge section which measures the relative position of the movable contact with respect to both fixed contacts.

[0009]

In general, if the positions of three arc-shaped points are specified, the diameter of the arc can be calculated. That is, if the positions of two of the three points are known, the remaining 1
By specifying the relative position of the points, the diameter of the arc can be known. Therefore, two fixed contacts that can contact the inner diameter surface of the half-moon are provided at known positions, and the movable contact is provided so as to be able to contact the inner diameter surface, and the relative position of the movable contact with respect to both fixed contacts is gauged. If it is measured at the part, the inner diameter of the half-moon part can be measured.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the device of the present invention will be described below with reference to FIGS.
It will be described based on.

As shown in FIG. 1, a measuring gauge according to the present invention comprises a block-shaped contact member (1) and a spindle (2) slidably provided inside the contact member (1).
And a gauge portion (3) attached to the rear end of the spindle (2).

The contact member (1) is provided on both sides of the thick disc.
The shape is cut symmetrically and parallel to the center line (x). The diameter (d) of the circumferential surface (5a) (5b) formed at both ends of the contact member (1) is the same as the circumferential surface (5a).
The curvature of (5b) is set to be larger than the curvature of the inner diameter surface (6a) of the meniscus (6). Further, as shown in FIG. 2, the width (s) of the contact member (1) is smaller than the entrance width (t) of the half-moon portion (6), and therefore, the contact member (1) has the half-moon portion (t). 6) Can be easily inserted in.

The contact member (1) has one circumferential surface (5) in the notch (7a) of the holding member (7) formed in a three-dimensional concave shape.
It is stored with a) protruding toward the half-moon (6). The contact member (1) and the gripping member (7) are fixed by attaching / detaching means (not shown) such as a screw, and the two can be separated by releasing the attaching / detaching means (by loosening the screw). There is.

An outer cylinder (8) is inserted in the central portions of the gripping member (7) and the contact member (1). The tip of the outer cylinder (8) extends to the vicinity of the center of the contact member (1),
On the other hand, its base end is fixed to the gauge section (3).
The outer cylinder (8) and the grip member (7) are fixed by screws (9).

The spindle (2) is slidably housed in the outer cylinder (8) with its axis aligned with the center line (x) of the contact member (1). The base end of the spindle (2) is
It extends into the gauge section (3), while its tip is
The contact member (1) extends to the vicinity of the front circumferential surface (5a). The tip portion of the spindle (2) is formed in a substantially spherical shape capable of making point contact with the inner diameter surface (6a) of the meniscus portion (6) (hereinafter, this spherical portion is referred to as a movable contactor (10)).

The gauge section (3) displays the advance distance of the spindle (2) with a pointer or the like, and a known dial gauge or the like is used as it is. The pointer of the gauge part (3) is connected to the spindle (2) via a gear mechanism, a rack, etc. (neither of which is shown), and when the spindle (2) is moved back and forth, it moves from its initial position. The distance is displayed by the pointer of the gauge section (3).

The method of use and the function of the above inner diameter measuring gauge will be described below.

First, the spindle (2) is returned to the initial position, and the pointer of the gauge section (3) is set to zero. Here, the initial position is set so that, when an arc having the same curvature as that of the front circumferential surface (5a) is overlapped, the tip of the movable contactor (10) is positioned on the arc (FIG. 2). (Indicated by the broken line).

Next, the gripping member (7) is gripped and the contact member (1) is inserted into the meniscus (6), and the front circumferential surface (5a) becomes the inner diameter surface (6a) of the meniscus (6). Push in the gripping member (7) until it makes contact. As a result, the two corners (12: hereinafter referred to as fixed contacts) formed at the boundary between the front side circumferential surface (5a) and its both side surfaces (11) are the inner diameter surface of the half-moon portion (6). (6a) Contact at the same time.

Next, while pressing the gripping member (7) toward the half-moon portion (6), the handle (13) of the gauge portion (3) is rotated to advance the spindle (2). As shown by the solid line in Fig. 2, the movable contactor (10) is attached to the inner surface (6) of the meniscus (6).
When it comes into contact with a), read the advance distance (L) of the spindle (2) from the pointer of the gauge section (3).

This forward movement distance (L) is calculated by using both fixed contacts (1
By comparing with the reference value calculated in advance from the position of 2) and the initial position of the movable contactor (10), it is possible to judge whether the inner diameter of the half-moon part (6) is within the tolerance. it can. For example, the inner diameter of the meniscus (6) is 20mm, and the tolerance is
If it is 0 to 0.025 mm, by comparing the measured forward distance (L) with a reference value calculated in advance, for example, 0.0125 mm to 0.0252 mm, it is determined whether the inner diameter of the meniscus (6) is within the tolerance. You can judge.

Further, it is possible to calculate the inner diameter itself of the half-moon portion (6) from this forward distance (L). Therefore, it is possible to grasp the amount of deviation from the standard inner diameter,
For example, when reworking a defective product, it becomes possible to clarify the required cutting amount and efficiently refinish. In this case, the gauge portion (3) is provided with a mechanism for converting the advance distance (L) of the spindle (2) into the inner diameter dimension, and the inner diameter dimension is directly displayed by the pointer of the gauge portion (3).
Further, it is convenient that the inner diameter can be visually checked.

When inspecting the half-moon portion (6) having different processing dimensions, the contact member (1) is removed from the gripping member (7) and the circumferential surface (5a) conforming to the dimensions of the half-moon portion (6). A new contact member (1) provided with is attached to the gripping member (7), and the measurement may be performed in the same procedure.

In this embodiment, the contact member (1) having a shape in which both sides of the thick disk are cut off is used, but this is easy in processing the contact member (1). It's just because I considered. Therefore, the shape of the contact member (1) is arbitrary, for example, the circumferential surface (5a) is formed into a flat surface, and the boundary corner between this flat surface and both side surfaces (11) is fixed contact (12).
It doesn't matter. However, the contact member (1) must have such a shape that when the contact member (1) is inserted into the half-moon portion (6), two points on the surface thereof can simultaneously come into contact with the inner diameter surface (6a) of the half-moon portion (6).

Further, the initial position of the movable contact (10) can be set to any position depending on the convenience of the operator. For example, the initial position may be set on a line connecting both fixed contacts (12), and in this case, the reference value and the inner diameter of the forward distance (L) described above can be more easily calculated. The advantage is that you can. This initial position is particularly useful when the fixed contacts (12) are arranged on a plane.

Further, in the present embodiment, the moving range of the movable contactor (10) is set on the right angle bisector of both the fixed contactors (12) for facilitating the calculation. May be set to a position offset to the left or right from the bisector of the right angle.
It may be set in an oblique direction with respect to the line connecting both fixed contacts (12). Further, in the present embodiment, the moving range is set between the fixed contacts (12), but it is theoretically possible to set it outside one of the fixed contacts (12). Is measurable.

Further, in the present embodiment, the gauge is used for measuring the inner diameter of the meniscus (6) provided in the mission case (14), but the gauge is not limited to this, and is substantially semicircular. It is suitable for measuring the inner diameter of any member that has a concave half moon.

[0028]

As described above, according to the present invention, it is possible to directly measure not only whether or not the inner diameter of the half-moon portion is within a predetermined tolerance, but also the inner diameter dimension itself. Therefore, the amount of deviation from the reference inner diameter can be grasped, and for example, when reworking a defective product, the required cutting amount can be clarified and the refinishing can be efficiently performed. In addition, it has an advantage that it can be measured quickly and accurately and that it has a simple and small structure and is convenient to handle.

[Brief description of drawings]

FIG. 1 is a partial front sectional view showing the overall configuration of a measuring gauge according to the present invention.

FIG. 2 is an enlarged front view of a main part showing a measurement state of an inner diameter.

3A is a vertical sectional view showing a half-moon portion provided in a mission case, and FIG. 3B is a horizontal sectional view taken along the line AA in FIG. 3A.

[Explanation of symbols]

 3 Gauge part 6 Half moon part 6a Inner diameter surface 10 Moving contact 12 Fixed contact

Claims (1)

[Claims] 1. A gauge for measuring an inner diameter of a half-moon portion having a substantially semicircular cross section, which is provided at two known points, and is a pair of fixed contacts which can be in contact with the inner surface of the half-moon portion at the same time. A movable contactor that can contact the inner diameter surface of the half-moon and is movable between a contact position with the inner diameter surface and a position away from the inner diameter surface; An inner diameter measuring gauge for a half-moon portion, comprising a gauge portion for measuring a position.