JPH0776693B2 - Inner ring split type double row rolling bearing axial clearance measuring device - Google Patents

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art There is a bearing (for example, a bearing for an automobile wheel) which is incorporated with a minus clearance in the axial direction in order to prevent the bearing from rattling after being assembled. As one of the bearings of this type, there is an inner ring split type double row rolling bearing. As shown in FIG. 1, this bearing has one outer ring (1) and two inner rings (2) (2). ) And a double row rolling element (3) (3) interposed between the inner and outer rings, and the inner ring (2) (2)
A predetermined space h is provided between them, and the preload amount of the bearing can be set by tightening so that this h becomes zero.

Therefore, a bearing manufacturer measures whether or not the above h is finished within an allowable tolerance range before shipping the bearing. Conventionally, the following two methods are known for the above measurement. One of them is a method of measuring the friction torque of the bearing in a state where two inner rings (2) and (2) are fitted to the shaft and h = 0. The other is the two inner rings (2) (2)
A spacer having a known thickness T (however, T> h) is sandwiched between them to measure an axial movement amount h ′ of both inner rings (2) and (2) with respect to the outer ring (1), and from this, h = T− This is a method of obtaining h as h '. The reason for using these methods is that in the case of positive clearance, it is possible to measure the axial clearance from the axial movement of the inner ring or outer ring with the bearing fixed, but in the case of negative clearance, the bearing can be measured. This is because the amount of movement cannot be measured because preload is applied in a fixed state.

[0004]

The first method is to obtain 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 directly measured, it is only indirectly measured, resulting in large variations and poor reliability. For example, the friction torque value greatly changes depending on the surface roughness of the rolling surface and the presence or absence of foreign matter such as dust.

In the second method, since a spacer is interposed, it is troublesome, the measurement work efficiency is low, and automation is difficult.

[0006]

Means for Solving the Problems The present invention has an inner ring split type double row rolling bearing having one outer ring, an inner ring divided into two, and a double row rolling element interposed between the inner and outer rings. In the above, the two inner rings are airtight from both ends in the axial direction, and a pair of holding members that press and hold the inner ring and the rolling element in a state where the clearance between the inner and outer rings is 0, and the gap between the inner rings via one of the holding members. The constant pressure fluid supply means for ejecting fluid from the inner part and the measuring means for detecting the back pressure or the flow rate of the constant pressure fluid supply means and measuring the axial dimension of the gap between the inner rings from this detected value Configure the axial clearance measuring device for row rolling bearings,
This configuration is intended to solve the above problems.

[0007]

[Action] Two inner rings are pressed and held airtightly from both ends in the axial direction by a pair of holding members. In this state, the constant-pressure fluid supply means supplies the constant-pressure fluid toward the space between the inner rings via one of the holding members, and ejects the fluid from the space. Then, the back pressure or the flow rate of the constant pressure fluid supply means is detected by the measuring means. In the case of back pressure, it becomes higher as the gap becomes smaller, and in the case of flow rate, it becomes smaller as the gap becomes smaller. Therefore, for each bearing type and model number, a conversion table is created by obtaining the correlation between the back pressure and the interval dimension, or the flow rate and the interval dimension, and based on this conversion table, the detected value To measure and display the axial dimension of the space portion.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a principle diagram of the device of the present invention.
(4) is a pair of holding members, (5) is a constant pressure fluid supply means,
(6) shows a measuring means.

The pair of holding members (4) and (4) hold two inner rings (2) and (2) airtightly from both ends in the axial direction, and a shaft portion (4a) inserted into the inner ring inner diameter surface. (4a) and an annular flange portion (4b) integrally formed on the base side of the shaft portions (4a) and (4a) and contacting the axial end faces of the inner rings (2) and (2).
(4b) and O-rings (4c) and (4c) are attached to a part of the shaft portions (4a) and (4a). The shaft (4a) (4a)
Has substantially the same diameter as the inner diameter surface of the inner ring (2).

The constant pressure fluid supply means (5) includes a fluid pressure supply source (5a), a regulator (5b) and a fixed throttle (5c), and a shaft hole (4d) formed in one holding member (4).
The fluid is supplied at a constant pressure toward the space h between the inner rings (2) (2).

The measuring means (6) detects the back pressure, the flow rate or the flow velocity of the constant pressure fluid supply means (5) downstream of the fixed throttle (5c), and from this detected value, the interval between the inner rings (2) and (2). This is a configuration for measuring the axial dimension of the portion h.

The spacing h is usually set to several tens of microns, and air is used as the measuring fluid. The axial dimension of the gap h between the inner rings (2) and (2) is measured based on the same principle as the air micrometer.

FIG. 2 is a vertical sectional side view of an essential part showing an embodiment of the device of the present invention, in which one holding member (4) is a lower shaft (7).
Fixed to the main body frame (8) so that it can be raised and lowered and rotated, and the shaft portion (4a) is formed to be longer than the axial width dimension of the two inner rings (2) and (2). (2) (2) is supported concentrically, and an annular groove (4e) is formed on the outer periphery of the two inner rings (2) and (2) at positions corresponding to the axial center portions. 4e) and the central axial hole (4d) are connected by a plurality of radial holes (4f).

The other holding member (4) is composed of a weight (10) suspended and supported by a lower shaft (7) and a fixed upper shaft (9) corresponding to the lower shaft (7) so as to be slightly movable up and down. ) Presses the inner ring (2) (2) from above in the axial direction. still,
The weight (10) has a central hole (10a).
The lower part of a) has a tapered hole (10b), the central hole (10a) is inserted into the guide shaft part (9a) integrated with the upper shaft (9), and the bolt (9b) is attached to the lower end of the guide shaft part (9a). ) Fixed support ring (9c) is provided, and the taper hole (10b) of the weight (10) is supported by the taper portion of the outer periphery of the support ring (9c) in an aligned manner to form the lower shaft (7). Hold the weight (10) coaxially. Sealing rubber plates (11) and (11) for sealing the upper portion of the inner ring (2) are attached to the weight (10).

The constant pressure fluid supply means (5) is a lower shaft (7) from a fluid pressure supply source (5a) such as a compressor through a regulator (5b) and measuring means (6) such as an air-electric converter.
The constant pressure fluid (air) is supplied from the shaft hole (4d) of the holding member (4) on the side toward the space h between the two inner rings (2) (2). The means for moving the lower shaft (7) up and down with respect to the body frame (8) and the means for rotating are
Although not shown, this is an air cylinder, a motor, etc.
Appropriate means may be adopted. Further, a rotary joint (not shown) is used at the connecting portion between the constant pressure fluid supply means (5) and the shaft hole (4d) of the holding member (4) of the lower shaft (7).

An embodiment of the present invention has the above configuration,
Next, the procedure for measuring the axial clearance h will be described. First, the shaft part (4a) of the holding member (4) of the lower shaft (7) at the descending end
Install the bearing on. Then, the lower shaft (7) is lifted to bring the upper ends of the inner rings (2) and (2) into pressure contact with the weight (10) via the sealing rubber plate (11). The weight of the weight (10) is smaller than the axial preload amount, and when the preload amount is zero (clearance between the inner and outer rings and the rolling elements is 0), the weight between the inner rings (2) and (2) is accurate. This is for ensuring the axial dimension of the gap h. In this state, the lower shaft (7) is rotated to stabilize the postures of the two inner rings (2) and (2). Then, the constant pressure fluid is supplied from the constant pressure fluid supply means (5) to the inner ring (2).
(2) It is jetted from the interval h. In this state, the back pressure, flow rate or flow velocity of the constant pressure fluid supply means (5) is detected by the measuring means (6), and the inner ring (2) is detected from this detected value.
(2) The axial dimension of the space h between the two is obtained. That is, since the back pressure, the flow rate or the flow velocity of the constant pressure fluid supply means (5) changes with a certain correlation with the change in the axial dimension of the interval h between the inner rings (2), (2), this back pressure The axial dimension of the gap h can be obtained from the flow rate or the flow rate.

In the above-mentioned embodiment, the inner ring split type double row angular contact ball bearing is exemplified, but the same can be applied to the inner ring split type double row tapered roller bearing.

[0018]

EFFECTS OF THE INVENTION According to the present invention, a constant-pressure fluid is jetted from a gap between two inner rings, and a change in back pressure or flow rate thereof is measured to measure an axial dimension of the gap. Therefore, if there is dust or foreign matter, it can be blown away for measurement, there is no intervention of error, and the influence of error due to surface roughness can be avoided and accurate measurement can be performed. You can omit the trouble of intervening,
It is possible to provide an axial clearance measuring device for an inner ring split type double row rolling bearing which is simple in measurement work, easy in automation, highly accurate and highly reliable, and high in efficiency.

[Brief description of drawings]

FIG. 1 is a principle diagram of the device of the present invention.

FIG. 2 is a vertical sectional side view of a main part showing an embodiment of the device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 outer ring 2, 2 inner ring 3, 3 rolling elements 4, 4 a pair of holding members 5 constant pressure fluid supply means 6 measuring means

Claims (1)

[Claims] 1. An inner ring split type double row rolling bearing having one outer ring, an inner ring divided into two, and a double row rolling element interposed between the inner and outer rings. A pair of holding members that are airtight from both ends in the direction and press and hold the clearance between the inner and outer races and the rolling element to be zero, and a constant pressure fluid that ejects fluid from the gap between the inner races via one holding member. Inner ring split type double row, characterized in that it is provided with a supply means and a measuring means for detecting a back pressure or a flow rate of the constant pressure fluid supply means, and measuring the axial dimension of the space between the inner rings from the detected value. Axial clearance measuring device for rolling bearings.