CN112113488B

CN112113488B - Oil seal depth measuring device

Info

Publication number: CN112113488B
Application number: CN201910528927.5A
Authority: CN
Inventors: 迟晓梅
Original assignee: BMW Brilliance Automotive Ltd
Current assignee: BMW Brilliance Automotive Ltd
Priority date: 2019-06-19
Filing date: 2019-06-19
Publication date: 2022-03-18
Anticipated expiration: 2039-06-19
Also published as: CN112113488A

Abstract

The present disclosure provides a depth measuring device for measuring a depth of an oil seal surface relative to a crankcase end face, the depth measuring device including: a reference member that abuts against the end surface of the crankcase when the depth is measured; a floating member projecting outward from the reference member and having a contact portion capable of contacting the oil seal surface when measuring the depth; an elastic member abutting against the floating member; a sensor capable of measuring a displacement of the floating member when measuring a depth.

Description

Oil seal depth measuring device

Technical Field

The present disclosure generally relates to an oil seal depth measuring device.

Background

Oil seals are widely used in parts such as engines. In order to secure the sealing effect of the oil seal, it is important to ensure that the depth of the oil seal is within a predetermined range and to ensure the flatness of the oil seal is uniform.

Fig. 1 to 4 show prior art oil seal measurements. Fig. 1 is a front view showing an oil seal mounted on a crankcase in the prior art. Fig. 4 is a front view showing the oil seal in isolation. As shown in fig. 1, an opening is provided on the crankcase 100, in which the crankshaft 101 is mounted, and an oil seal 102 is fitted in the opening on the outside of the crankshaft 101. For clarity, the cover fitted on the outside of the oil seal is not shown in fig. 1.

Fig. 2 is a side perspective view illustrating a depth measurement process of an oil seal in the prior art. Depth gauge 104 includes a hollow base 105, a depth gauge 106, and a thimble. The first end 107a of the thimble is located outside the depth gauge 106 for operation by an operator. The other end of the thimble (not shown) is within the base 105 and flush with the end face of the base 105 in the unused state.

In measuring the oil seal depth, first, the operator presses the base 105 of the depth gauge 104 against the flat end face of the crankcase 100, resetting the reading of the depth gauge 106 to "0". Then, the operator presses the first end 107a of the thimble of the depth gauge 104, pushing the thimble out toward the oil seal 102 so that the other end of the thimble contacts the oil seal surface. After the other end of the needle contacts the oil seal surface, the operator reads and records a reading of the depth gauge 106 to obtain the stroke of the other end of the needle, i.e., the depth of the oil seal 102 at that location.

FIG. 3 is a schematic diagram showing several prior art oil seal depth measurement positions. Typically, the operator will select multiple (e.g., 4) locations to repeat the measurement process as shown in fig. 2 to obtain multiple readings to eliminate measurement errors. If the readings are within a predetermined range (e.g., 2 + -0.5 mm), the oil seal is judged to be flat and satisfactory. Conversely, if one or more of the readings are outside of the predetermined range, the oil seal is determined to be undesirable.

The oil seal depth measurement of the prior art has some defects, for example, as shown in fig. 4, the oil seal is provided with a groove, so that an operator needs to determine the position of the other end of the thimble to avoid the groove by naked eyes, which prolongs the operation time on one hand and increases the risk of generating measurement errors on the other hand. In addition, the operator needs to record readings for judgment in the course of multiple measurements, resulting in an increase in operation load and time. Moreover, since the measurement positions are discrete, the entire oil seal surface cannot be measured, resulting in a decrease in reliability of the measurement accuracy.

Disclosure of Invention

It is an object of the present disclosure to provide a depth measurement device that overcomes at least one of the deficiencies of the prior art.

According to an aspect of the present disclosure, there is provided an oil seal depth measuring device for measuring a depth of a surface of an oil seal with respect to an end surface of a crankcase, characterized by comprising: a reference member that abuts against the end surface of the crankcase when the depth is measured; a floating member having a contact surface projecting outward with respect to the reference member, the contact surface projecting with respect to the reference member by a distance greater than the depth so that the contact surface can be brought into contact with the oil seal surface when the depth is measured; an elastic member abutting against the floating member; a sensor capable of measuring a displacement of the floating member when measuring a depth.

Preferably, the contact surface is annular, mating with the surface of the oil seal.

Preferably, the depth measuring device further includes a fixing member that is fixedly provided in the oil seal depth measuring device and defines a position of the floating member in an unused state of the oil seal depth measuring device.

Preferably, the floating member is in contact with and slidable on a radially outer surface of the fixed member.

Preferably, the radially outer surface of the fixing member is arcuate.

Preferably, the depth measuring device further comprises a display configured to be able to receive the output data of the sensor and to display the depth data on the display.

Preferably, the display is further configured to be able to display a traffic light signal, a green light when the depth is within a predetermined tolerance range, and a red light when the depth is outside the predetermined tolerance range.

Preferably, the floating member is provided therein with a recess in which one end of the elastic member is fitted.

Preferably, the floating member has a recess therein, the recess having a rod fitted therein, the rod being configured to prevent undesired twisting of the elastic member.

Preferably, the elastic member is a coil spring, and the coil spring is fitted over the rod.

Drawings

Various aspects of the disclosure will be better understood upon reading the following detailed description in conjunction with the drawings in which:

fig. 1 is a front view showing an oil seal mounted on a crankcase in the prior art.

Fig. 2 is a side perspective view illustrating a depth measurement process of an oil seal in the prior art.

Fig. 3 is a schematic diagram showing a depth measurement position of an oil seal in the prior art.

Fig. 4 is a front view showing the oil seal in isolation.

FIG. 5 is a cross-sectional view illustrating a depth measurement device according to an embodiment of the present invention.

Fig. 6 is an enlarged sectional view showing a circled portion in fig. 5.

FIG. 7 is another cross-sectional view different from FIG. 5, showing a depth measurement device according to an embodiment of the present invention.

Fig. 8 is a perspective view showing a state of the depth measuring device according to the embodiment of the present invention when measuring the depth of the oil seal.

Fig. 9 is a sectional view showing a state of the depth measuring device according to the embodiment of the present invention when measuring the depth of the oil seal.

Detailed Description

The present disclosure will now be described with reference to the accompanying drawings, which illustrate several embodiments of the disclosure. It should be understood, however, that the present disclosure may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, the embodiments described below are intended to provide a more complete disclosure of the present disclosure, and to fully convey the scope of the disclosure to those skilled in the art. It is also to be understood that the embodiments disclosed herein can be combined in various ways to provide further additional embodiments. Furthermore, the drawings are only schematic and illustrate embodiments and are not necessarily to scale.

It should be understood that like reference numerals refer to like elements throughout the several views. The terminology used in the description is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. All terms (including technical and scientific terms) used in the specification have the meaning commonly understood by one of ordinary skill in the art unless otherwise defined. Well-known functions or constructions may not be described in detail for brevity and/or clarity.

Depth measuring device

A depth measuring device according to an embodiment of the present invention is described below with reference to fig. 5 to 7. FIG. 5 is a cross-sectional view illustrating a depth measurement device according to an embodiment of the present invention. Fig. 7 is another sectional view different from fig. 5, showing the depth measuring device according to the embodiment.

The depth measuring device comprises a holding part 1, a floating part 2, a fixing part 3, a positioning pin 4, an elastic part 5, a displacement sensor 6, a shell 7, a handle 8 and a limiting plate 9. The body of the depth measuring device is generally cylindrical with an axis L indicated by the dashed line. In the following description, the direction of the center axis L is represented as an axial direction, and the direction perpendicular to the axial direction is represented as a radial direction. For convenience of explanation, in the orientation of fig. 5 and 7, the lower side is the side closer to the oil seal, the upper side is the side farther from the oil seal, the outer side is the side farther from the axis L in the radial direction, and the inner side is the side closer to the axis L in the radial direction.

As shown in fig. 5 and 7, the grip member 1 is fixedly provided on the outer periphery of the depth measuring device at the lower side, and preferably, the grip member 1 has a substantially cylindrical shape. The gripping part 1 is provided with an annular groove 13 on the outside for the operator to grip. The gripping member 1 is provided with an annular boss 11 located innermost and an annular face 12 located outside the annular boss 11. As shown in fig. 5, the annular boss 11 has a radially outer peripheral surface 11a, a radially inner peripheral surface 11b, and an axially lower end surface 11 c. The outer diameter D of the annular boss 11 shown in fig. 7 is equal to the diameter of the opening of the crankcase fitted with the oil seal.

The floating member 2 is mounted radially inside the grip member 1. Preferably, the floating member 2 is substantially disc-shaped. As shown in fig. 7, the floating member 2 includes a main body portion 2a and a contact portion 2b projecting downward from the main body portion 2 a. A plurality of recesses 21 are provided in the main body portion 2a of the floating member 2, and a rod 22 is fixedly fitted in each recess 21. The elastic member 5 is, for example, a coil spring which is fitted over the rod 22. The provision of the rod 22 prevents the coil spring from being undesirably distorted and affecting the measurement. The elastic member 5 has an upper end mounted in a seat portion in the depth measuring device and a lower end abutting against the main body portion 2a of the float member 2, and applies a predetermined amount of downward thrust to the float member 2 in an unused state of the depth measuring device. The length of the rod 22 is set so that it does not contact the seat in the depth measuring device even during depth measurement. As shown in fig. 6, the radially inner peripheral surface 23 of the body portion 2a contacts the outer peripheral surface 31 of the fixing member 3.

As shown in fig. 7, the contact portion 2b of the floating member 2 has a contact surface in a ring shape, and protrudes downward from the radially outer side of the main body portion 2 a. The radial width of the contact surface is substantially equal to the radial width of the oil seal 102. During the measurement of the depth of the oil seal, the annular contact surface is in contact with the annular oil seal surface to be measured. Through the surface-surface contact between the contact surface and the surface of the oil seal, the influence of the groove in the oil seal on the measurement result can be avoided, the work of avoiding the groove in the prior art is omitted, the time is saved, and the accuracy is improved.

The fixed member 3 is fixedly installed radially inside the floating member 2. Preferably, the fixed part 3 is substantially disc-shaped. As shown in fig. 6, the outer peripheral surface 31 of the fixed member 3 has a curvature and is provided to be relatively smooth to allow the radially inner peripheral surface 23 of the floating member 2 to slide freely on the outer peripheral surface 31 of the fixed member 3. The floating member 2 in contact with the oil seal surface is allowed to float obliquely at an angle by the smooth arc-shaped outer peripheral surface 31. Such an arrangement allows the floating member 2 to float more freely following the surface of the oil seal, improving the accuracy of measuring the depth of the oil seal.

A positioning pin 4 is fixedly provided to the fixing member 3. A positioning pin 4 projects toward the lower side from the fixed member 3, and can be inserted into a crankshaft hole 103 (see fig. 1) provided on the crankshaft 101 at the time of oil seal measurement. The diameter of the locating pin 4 is substantially equal to the diameter of the crankshaft bore 103 so as to limit movement of the depth measuring device in directions other than the axial direction to substantially locate the depth determining device in the crankshaft bore 103.

The displacement sensor 6 is fixed at its upper end and abuts against the main body 2a of the floating member 2 at its lower end, and is capable of moving up and down following the main body 2a as the main body 2a moves and reading the axial displacement of the main body 2a, and transmitting data of the displacement to a display (not shown) provided outside the depth measuring device by wire or wirelessly. Preferably, a plurality of displacement sensors 6 are provided. For example, four displacement sensors 6 may be provided.

The display may display the displacement data (i.e. the oil seal depth) upon receiving the displacement data from the displacement sensor 6, and optionally also a signal such as a traffic light. Under the condition that the depth of the oil seal falls into an allowable range, a display displays a green light to indicate that the flatness of the oil seal is qualified; and under the condition that the depth of the oil seal exceeds the allowable range, the display displays a red light to indicate that the flatness of the oil seal is unqualified.

And a handle 8 is fixedly arranged at the upper end of the depth measuring device and is used for an operator to grasp during measurement.

As shown in fig. 5 and 7, the position restriction plate 9 is fixed to the fixed member 3 by a screw 32, and abuts against the lower side of the main body portion 2a of the floating member 2 in the unused state of the depth measuring device to define the lower limit of the axial position of the floating member 2. At this time, the contact surface of the contact portion 2b protrudes with respect to the ring surface 12 by a distance d (see fig. 7) which is larger than the depth of the oil seal, for example, 3mm or more in the case where the allowable range of the oil seal depth is 2 ± 0.5 mm. The ring surface 12 abuts against an end surface of the crankcase at the time of measurement, and serves as a reference surface for measurement, and therefore the ring surface 12 also serves as a reference member.

Depth measurement process

The following describes a process of measuring the depth of an oil seal using the depth measuring device of the embodiment of the present disclosure.

Fig. 8 is a perspective view showing a state of the depth measuring device according to the embodiment of the present invention when measuring the depth of the oil seal. Fig. 9 is a sectional view showing a state of the depth measuring device according to the embodiment of the present invention when measuring the depth of the oil seal.

Before measuring the depth of the oil seal, the operator abuts the contact surfaces of the ring surface 12 and the contact portion 2b of the grip member 1 on the same flat plane, and returns the reading of the displacement sensor to "0". The zeroing process is known to those skilled in the art and will not be described in detail herein. By the zeroing process, the displacement data of the displacement sensor 6 is indicative of the distance the contact surface protrudes from the annulus 12, i.e. the depth of the oil seal, during subsequent oil seal depth measurements.

Thereafter, as shown in fig. 8 and 9, when measuring the depth of the oil seal, the operator grasps the groove 13 of the grip member 1 of the depth measuring device, and inserts the positioning pin 4 of the depth measuring device into the crank hole 103 (refer to fig. 1) of the crankshaft 101 to substantially position the depth measuring device. Next, the operator holds the recess 13 with one hand and the handle 8 with the other hand, and presses the depth measuring device against the end face of the crankcase 100 in the direction of arrow a in fig. 8. Since the outer diameter D (fig. 7) of the annular boss 11 is equal to the diameter of the opening of the crankcase, which is fitted with an oil seal, the annular face 12 (fig. 5) of the grip member 1 is pressed against the end face of the crankcase 100, further positioning the depth measuring device.

In the above process, since the contact surface of the contact portion 2b of the floating member 2 projects relative to the ring surface 12 by a distance d greater than the depth of the oil seal, the contact surface of the contact portion 2b already contacts the surface of the oil seal 102 before the ring surface 12 is pressed against the end surface of the crankcase 100. As the depth measuring device moves in the direction of arrow a, the contact portion 2b moves closer to the handle 8 side against the compression force of the elastic member 5 until the ring surface 12 is pressed against the end surface of the crankcase 100. The displacement sensor 6 transmits displacement data of the floating member 2 to a display (not shown). The display may display the oil seal depth after receiving the displacement data from the displacement sensor 6. The display can show the digital degree of depth of oil blanket, can also show traffic lights signal, tells whether the degree of depth of operating personnel oil blanket falls into the allowed band, and whether the oil blanket roughness is qualified promptly. Through such simple operation, can judge directly perceivedly whether the oil blanket is level, save operating time.

Alternatively, the operator may remove the depth measuring device a little after one measurement, rotate an angle and measure again, thereby further improving the accuracy of the depth measurement.

One embodiment of the present disclosure is described above, but it should be understood that the present disclosure is not limited thereto. For example, although it is described above that the stopper plate 9 and the fixing member 3 are fixed by the screw 32, alternatively, the stopper plate 9 may be an integral part of the fixing member 3. Although it is described above that the rod 22 fitted in the recess 21 protrudes into the elastic member 5, the rod 22 is not necessary. Alternatively, one end of the elastic member 5 is directly fitted in the recess without providing the rod 22. Although it is described above that the elastic member 5 is a coil spring, the elastic member 5 may be, for example, an elastic block, floating of the floating member is achieved by abutment of the elastic block with a rod, or the like.

Those skilled in the art will appreciate that numerous variations and modifications may be made to the exemplary embodiments of the disclosure without materially departing from the spirit and scope of the disclosure. Accordingly, all changes and modifications are intended to be included within the scope of the present disclosure as defined in the appended claims. The disclosure is defined by the following claims, with equivalents of the claims to be included therein.

Claims

1. An oil seal depth measuring device for measuring the depth of an oil seal surface relative to a crankcase end face, the oil seal depth measuring device comprising:

a reference member that abuts against the end surface of the crankcase when the depth is measured;

a floating member having a contact surface projecting outward with respect to the reference member, the contact surface projecting with respect to the reference member by a distance greater than the depth so that the contact surface can be brought into contact with the oil seal surface when the depth is measured;

an elastic member abutting against the floating member;

a sensor capable of measuring a displacement of the floating member when measuring a depth,

the oil seal depth measuring device further includes a fixing member that is fixedly provided in the oil seal depth measuring device and defines a position of the floating member in an unused state of the oil seal depth measuring device,

wherein the floating member is in contact with and slidable on a radially outer surface of the fixed member,

wherein the radially outer surface of the fixation component is arcuate.

2. An oil seal depth measuring device as defined in claim 1, wherein the contact surface is annular, mating with the oil seal surface.

3. An oil seal depth measuring device according to claim 1, further comprising a display configured to be able to receive the output data of the sensor and to display the depth data on the display.

4. An oil seal depth measurement device according to claim 3, wherein the display is further configured to be able to display a traffic light signal, a green light when the depth is within a predetermined tolerance range, and a red light when the depth is outside the predetermined tolerance range.

5. An oil seal depth measuring device according to claim 1, wherein a recess is provided in the floating member, and one end of the elastic member is fitted in the recess.

6. An oil seal depth measuring device according to claim 1, wherein the floating member has a recess provided therein, and a rod is fitted in the recess, the rod being configured to prevent undesired twisting of the elastic member.

7. An oil seal depth measuring device according to claim 6, wherein the resilient member is a coil spring that is fitted over the rod.