JP3287633B2 - Axial clearance measuring device for inner ring split type double row rolling bearings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for measuring an axial clearance between inner rings of an inner ring split type double row rolling bearing.

[0002]

2. Description of the Related Art A bearing for an automobile wheel or the like is assembled in a state where a preload is applied in order to prevent rattling after the assembly, and an inner ring split type double row rolling bearing is used for such an application. As shown in the figure, the outer ring (1) includes an inner ring (2) divided into two, and a double-row rolling element (3) interposed between the inner and outer rings (2, 1). ,
A predetermined clearance (2a) between opposing end surfaces of the pair of inner rings (2);
And the axial dimension (h) of this clearance (2a)
Is set to zero so that the preload amount of the bearing can be set.

[0003] Therefore, before shipping the bearing, it is necessary for the bearing manufacturer to inspect whether or not the clearance (2a) is finished so that the axial dimension (h) falls within the allowable tolerance range. Conventionally, the following two methods are known for measuring the axial clearance. The first method is a method in which two inner rings (2) are fitted to a shaft, and the friction torque of the bearing is measured with h = 0. In the second method, a spacer having a known thickness T (where T> h) is sandwiched between two inner rings (2).
Is measured by measuring the axial movement amount h ′ of both inner wheels (2) with respect to the distance h, and calculating h = Th−h ′. The reason that these methods are used is that in the case of plus clearance, the axial clearance can be measured from the amount of axial movement of the inner ring or outer ring with the bearing fixed, whereas in the case of minus clearance, the bearing can be measured Is fixed, the clearance disappears and the preload is applied. Therefore, the clearance cannot be measured from the relative movement amount of the inner ring and the outer ring as in the case of the plus clearance.

[0004]

The first method is to determine the axial clearance by measuring the friction torque from the viewpoint that the friction torque of the bearing is proportional to the axial clearance. Since the directional clearance is not measured directly but only indirectly, the variation is large and the reliability is poor. For example, the friction torque value greatly changes depending on the presence or absence of foreign matters such as surface roughness and dust on the rolling surface.

In the second method, since it is necessary to interpose a spacer, it is troublesome, and the measurement work efficiency is poor.
Automation is also difficult.

An object of the present invention is to provide a simple and highly accurate measurement of the axial clearance of an inner ring split type double row rolling bearing.

[0007]

SUMMARY OF THE INVENTION An axial clearance measuring apparatus for an inner ring split type double row rolling bearing according to the present invention comprises: a pair of holding members for pressing and holding a pair of inner rings in an axial direction; It is characterized by comprising a fluid suction means for sucking a fluid through a gap between the end faces, and a measuring means for detecting a back pressure, a flow rate or a flow velocity and measuring the axial dimension of the gap from the detected value.

[0008]

When the fluid is sucked through the clearance between the opposed end faces of the inner race, the back pressure, flow rate or flow velocity changes depending on the axial dimension of the clearance. If the suction pressure by the fluid suction means is kept constant, the relationship between the axial dimension of the clearance and the back pressure, flow rate or flow velocity is established. The back pressure increases as the axial dimension of the clearance decreases, and the flow rate and flow velocity decrease as the axial dimension of the clearance decreases. Therefore, for each type and model number of the bearing, the correlation between the axial dimension of the clearance and the back pressure, flow rate or flow velocity is determined in advance, and a conversion table is created. Based on this conversion table, the back pressure, flow rate Alternatively, the axial dimension of the clearance can be determined from the detected value of the flow velocity.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, referring to FIG. 1 showing the principle of the present invention, two inner rings (2) are pressed and held from both ends in the axial direction by a pair of holding members (4). (4) is a shaft (4) inserted into the inner diameter surface of the inner ring (2).
a) and an annular flange portion (4b) abutting on the end face of the inner ring (2).
Are integrally formed. Shaft (4a) is inner ring (2)
The O-ring (4c), which has substantially the same diameter as the inner diameter surface of the shaft (4a) and is attached to the shaft (4a), keeps the space between the shaft (4a) and the inner ring (2) airtight.

One of the holding members (4) has a hole (4d) opened on the end face, and the hole (4d) is provided with the fluid suction means (5).
It is connected to the. The fluid suction means (5) is a vacuum source (5
a), a regulator (5b) and a fixed throttle (5c) are connected by a conduit, so that a gap (2a) between the opposed end faces of the inner ring (2) is formed through a hole (4d) and a vacuum source (5a).
Connected to. The axial dimension (h) of the clearance (2a) is usually on the order of tens of microns.

The measuring means (6) is connected upstream of the fixed throttle (5c) of the fluid suction means (5), detects the back pressure, flow rate or flow velocity at the section, and based on the same principle as the air micrometer. The axial dimension (h) of the clearance (2a) between the opposed end faces of the pair of inner rings (2) is measured from the back pressure, the flow rate or the flow rate.

Next, an embodiment of the present invention shown in FIG. 2 will be described.

One holding member (4) is fixed to the lower shaft (7), and is mounted on the main body frame (8) so as to be able to move up and down and rotate, and the shaft portion (4a) has a width of two inner rings (2). An annular groove (4e) is formed on the outer periphery at a position corresponding to the axial center of the two inner rings (2), and formed concentrically with the two inner rings (2). The annular groove (4e) and the central axial hole (4d) are communicated by a plurality of radial holes (4f).

The other holding member (4) is composed of a weight (10) suspended and supported slightly upward and downward on a fixed upper shaft (9) corresponding to the lower shaft (7). ) Presses the inner ring (2) axially from above. In addition, weight (10)
Has a central hole (10a), a tapered hole (10b) below the central hole (10a), and a central hole (10a) inserted through a guide shaft (9a) integral with the upper shaft (9). A support ring (9c) fixed with bolts (9b) is provided at the lower end of the guide shaft (9a). The lower shaft (7) and the weight (10) are coaxially held by being supported in a centered manner. A sealing rubber plate (11) for sealing the upper part of the inner ring (2) is attached to the weight (10).

The fluid suction means (5) is provided with a regulator (5b) and an air / air pump by a vacuum source (5a) such as a vacuum pump.
Fluid (air) is passed through the shaft hole (4d) of the holding member (4) on the lower shaft (7) side through the measuring means (6) such as an electric converter, and a clearance (2a) between the opposed end faces of the inner ring (2). Is to be sucked through.

The means for raising and lowering the lower shaft (7) with respect to the body frame (8) and the means for rotating it are as follows.
Although not shown, appropriate means such as an air cylinder and a motor can be employed. Also, a fluid suction means (5)
A rotary joint (not shown) is used at the connection between the lower shaft (7) and the shaft hole (4d) of the holding member (4).

The procedure for measuring the axial dimension (h) of the clearance (2a) in the above embodiment is as follows.

First, a bearing is mounted on the shaft (4a) of the holding member (4) of the lower shaft (7) at the lower end. Then, the lower shaft (7) is raised, and the upper end of the inner ring (2) is pressed against the weight (10) via the sealing rubber plate (11). This weight (1
The weight of 0) is smaller than the amount of axial preload, and the exact axial dimension (h) of the clearance (2a) when the amount of preload is zero (the clearance between the inner / outer ring and the rolling element is 0) is determined. It is for securing. In this state, rotate the lower shaft (7),
Stabilize the posture of the two inner rings (2). Then, the fluid is sucked through the clearance (2a) by the fluid suction means (5). In this state, the back pressure, flow rate or flow velocity of the fluid suction means (5) is detected by the measurement means (6), and the axial dimension (h) of the clearance (2a) is obtained from the detected value. The back pressure, flow rate or flow rate of the fluid suction means (5) is determined by the clearance (2
Since it changes with a certain correlation with the change in the axial dimension (h) of a), the axial dimension (h) of the clearance (2a) can be obtained from this back pressure, flow rate or flow velocity.

In the above embodiment, an inner ring split type double row angular contact ball bearing is exemplified, but the present invention can be similarly applied to an inner ring split type double row tapered roller bearing.

[0020]

As described above, according to the present invention, a pair of holding members for pressing and holding a pair of inner races in the axial direction are provided.
A fluid suction means for sucking a fluid through a gap between the opposed end faces of the pair of inner rings; and a measuring means for detecting a back pressure, a flow rate or a flow velocity of the fluid suction means. Since the fluid is sucked, and the axial dimension of the clearance is measured from the back pressure, flow rate or flow velocity, the presence of foreign matter such as dust as in the first conventional method of measuring friction torque can be improved. Accurate measurement with few errors is possible without being affected by surface roughness. Further, as compared with the second conventional method, the work of inserting a spacer and the like can be omitted, the measurement operation can be simplified, and automation can be easily performed. As described above, according to the present invention, a highly accurate and highly reliable and highly efficient axial clearance measuring apparatus for an inner ring split type double row rolling bearing can be obtained.

Further, by sucking fluid from between the inner and outer rings of the bearing through the clearance between the opposed end faces of the inner ring,
Even if there is dust or foreign matter between the inner and outer rings, it is sucked together with the fluid, so that it does not adhere to the rolling elements and rolling surfaces, and since the dust and foreign matter does not scatter around the bearing, the working atmosphere is kept clean. Dripping.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view illustrating the principle of the present invention.

FIG. 2 is a longitudinal sectional view (a) and a partially enlarged view (b) showing an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer ring 2 Inner ring 2a Clearance 3 Rolling element 4 Clamping member 5 Fluid suction means 6 Measurement means h Axial dimension of clearance

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G01B 13/00-13/24 F16C 19/18

Claims (1)

(57) [Claims] An apparatus for measuring an axial clearance of an inner ring split type double row rolling bearing having an outer ring, a pair of inner rings, and a double row of rolling elements interposed between the inner and outer rings, comprising: A pair of clamping members for clamping the inner ring by pressing the inner ring in the axial direction;
An inner ring splitter comprising: a fluid suction means for sucking a fluid through a gap between opposed end surfaces of a pair of inner rings; and a measuring means for detecting a back pressure, a flow rate or a flow velocity and measuring the axial dimension of the gap from the detected value. Axial clearance measuring device for double row rolling bearings.