JP5235143B2 - Sheave surface distance measuring device - Google Patents

Description

  The present invention relates to a sheave surface distance measuring device that measures a distance between a fixed sheave of a primary pulley and a fixed sheave of a secondary pulley of a continuously variable transmission.

  The transmission of an automobile is not only a manual transmission (MT) or an automatic transmission (AT) that switches the gear ratio stepwise, but also a continuously variable transmission that can continuously switch the gear ratio (stepless). CVT).

  FIG. 5 shows a configuration example of a continuously variable transmission. The continuously variable transmission 100 includes a primary pulley 10 connected to a power generation side (engine side), a secondary pulley 20 connected to a power transmission side (differential side), and a belt 30 stretched between them. Is mainly provided. The power transmitted from the engine to the primary pulley 10 is shifted at a predetermined pulley ratio via the belt 30 and transmitted to the secondary pulley 20.

  The primary pulley 10 includes a pulley shaft 11, a fixed sheave 12 that protrudes from the pulley shaft 11 to the outer diameter and is provided integrally with the pulley shaft 11, and a movable sheave 13 that is fitted to the outer peripheral surface of the pulley shaft 11. The movable sheave 13 is provided so as to be movable in the axial direction with respect to the pulley shaft 11. The fixed sheave 12 and the movable sheave 13 are formed with conical sheave surfaces 12a and 13a facing each other in the direction of the pulley shaft 11, and a belt 30 is disposed between the sheave surfaces 12a and 13a.

  The secondary pulley 20 has substantially the same configuration as the primary pulley 10, a pulley shaft 21 fixed to the vehicle body side, a fixed sheave 22 that protrudes from the pulley shaft 21 to the outer diameter, and is provided integrally with the pulley shaft 21. And a movable sheave 23 fitted to the outer peripheral surface of the pulley shaft 21. The movable sheave 23 is provided so as to be movable in the axial direction with respect to the pulley shaft 21. The fixed sheave 22 and the movable sheave 23 are formed with conical surface sheave surfaces 22a and 23a facing each other in the pulley shaft 21 direction, and the belt 30 is disposed between the sheave surfaces 22a and 23a. The fixed sheave 22 and the movable sheave 23 on the secondary side (hereinafter abbreviated as “S side”) and the fixed sheave 12 and the movable sheave 13 on the primary side (hereinafter abbreviated as “P side”) and the pulley shaft direction. It is in a reversed positional relationship.

  In such a continuously variable transmission 100, as shown in FIG. 6, when the P side of the belt 30 is wound around the outer diameter portion of the primary pulley 10 and the S side is wound around the small diameter portion of the secondary pulley 20, The pulley ratio becomes large (that is, a high output state). On the other hand, when the belt 30 is wound around the small diameter portion of the primary pulley 10 and the S side is wound around the large diameter portion of the secondary pulley 20 as shown in FIG. Is small (that is, a high-speed rotation state).

  As indicated by white arrows in FIG. 6, the pulley ratio is continuously changed by moving the belt 30 in the radial direction by moving the movable sheave 13 on the P side and the movable sheave 23 on the S side in the axial direction. Can do. At this time, if only one of the movable sheaves is moved, the belt 30 becomes excessive or insufficient. Therefore, the movable sheaves 13 and 23 are interlocked to apply a constant tension to the belt 30.

  When the pulley ratio is changed in this way, the belt 30 is slightly displaced from the axial position of the P-side end and the axial position of the S-side end due to the influence of friction between the belt 30 and each sheave surface. Drive on. For example, the displacement is measured by measuring the distance between the sheave surfaces of the two fixed sheaves, and inserting a shim 40 having an appropriate thickness between the support bearing 24 of the secondary pulley 20 and the case 50 according to the measured value. It can be corrected by finely adjusting the inter-surface distance.

  At this time, it is necessary to accurately measure the distance between the sheave surfaces. The conventional method for measuring the distance between sheave surfaces is to insert a block gauge of various thicknesses between the sheave surfaces of the fixed sheave, and measure the thickness of the block gauge that fits between the sheave surfaces as the distance between the sheave surfaces. It was. However, since the sheave surface is a tapered curved surface, it is difficult to stabilize the block gauge between the sheave surfaces. For this reason, there existed a problem that measurement took time and the variation of the measured value for every measurer was large.

  For example, a sheave surface distance measuring device disclosed in Patent Document 1 is a distance between sheave surfaces by inserting a device body having a measuring means (electric micrometer) between sheave surfaces of fixed sheaves of both pulleys. Is measuring.

JP 2000-2221026 A

  However, in order to measure the distance between the tapered sheave surfaces, as shown in FIG. 8, at the locations where the bus bars of the sheave surfaces 12a and 22a of the fixed sheaves 12 and 22 are parallel to each other, they are orthogonal to both bus bars. Therefore, it is not easy to position the apparatus main body in such a state. In the apparatus of Patent Document 1, the reference point of the apparatus main body is brought into contact with the sheave surface of the fixed sheave on the S side, and two contacts provided on the opposite side of the reference point of the apparatus main body are protruded to make P The apparatus main body is positioned by contacting the sheave surface of the fixed sheave on the side. In this case, since a process for projecting the contact is required, the number of steps is increased and the work efficiency is poor. Moreover, since it is necessary to provide driving means such as a cylinder for projecting the contact, the apparatus becomes large. Further, in order to accurately position the apparatus main body, it is necessary to make the protruding amounts of the two contacts exactly the same. For this purpose, the apparatus main body and the contactor are designed with high accuracy, and the contactor Since it is necessary to control the drive means for projecting with high accuracy, the cost of the equipment is increased.

  An object of the present invention is to easily and accurately measure the distance between the sheave surface of the P-side fixed sheave and the S-side fixed sheave of the continuously variable transmission.

  In order to solve the above problems, the present invention is an apparatus for measuring a distance between sheave surfaces of a fixed sheave of a primary pulley and a secondary pulley in a continuously variable transmission, and an outer peripheral surface of a pulley shaft of one pulley A guide member to be fitted; an apparatus main body having a reference surface attached to the guide member and contacting the sheave surface; and a measuring means provided on the apparatus main body for measuring a distance between the sheave surfaces. Provided is a sheave surface distance measuring device in which a reference surface of a device body is in contact with the sheave surface along a generatrix of one sheave surface in a state of being fitted to an outer peripheral surface of a pulley shaft. .

  As described above, in the sheave surface distance measuring device according to the present invention, in a state where the guide member is fitted to the outer peripheral surface of the pulley shaft, the reference surface of the device body is along the generatrix of the sheave surface of the fixed sheave. It is trying to contact. Therefore, the apparatus main body can be positioned in a state where the measurement direction is determined with reference to the generatrix of the sheave surface only by fitting the guide member to the outer peripheral surface of the pulley shaft. Thereby, while being able to shorten measurement time, the variation for every measurer can be made small. Further, since it is not necessary to use a driving means such as a cylinder for positioning the apparatus main body, the apparatus can be miniaturized.

  For example, as shown in FIG. 9, even if the reference surface 4a of the apparatus main body 3 is not parallel to the generatrix of the sheave surface 22a, the apparatus main body 3 can be rotated by being attached to the guide member 2. By rotating 3 in the direction of the arrow in the figure, the reference surface 4a of the apparatus body 3 can be brought into contact with the sheave surface along the generatrix (see FIG. 10).

  If a measuring instrument that measures the distance to the object to be measured without contact is used as the measuring means, the distance to the object to be measured can be accurately measured in a short time. Such a non-contact type measuring device is suitable when the surface to be measured is a flat surface, but is not suitable when the surface to be measured is a curved surface such as a sheave surface, and there is a possibility that the measurement accuracy may be lowered. Therefore, the measurement means is provided with a float portion that can slide in a direction perpendicular to the reference surface, and one end portion of the float portion can be brought into contact with the other sheave surface, and the other end portion of the float portion is A flat surface was used, and the distance from the flat surface was measured with a non-contact type measuring instrument. As a result, the curved sheave surface can be converted into a flat surface via the float portion, and the flat surface can be measured with a non-contact type measuring instrument as a surface to be measured, so that the measurement accuracy can be increased. .

  As described above, according to the present invention, the distance between sheave surfaces of the P-side fixed sheave and the S-side fixed sheave of the continuously variable transmission can be measured easily and with high accuracy.

It is a perspective view of the distance measurement apparatus between sheave surfaces. It is sectional drawing which shows the state which fitted the sheave surface distance measuring apparatus to the pulley shaft of a continuously variable transmission. FIG. 3 is an enlarged view of FIG. 2. It is a graph which shows the relationship between rotation angle (theta) of the distance measuring apparatus between sheave surfaces, and distance D between a measuring device and a float part. It is sectional drawing of a continuously variable transmission. It is sectional drawing of the continuously variable transmission whose pulley ratio is a high output state. It is sectional drawing of the continuously variable transmission whose pulley ratio is a high-speed rotation state. It is sectional drawing which shows the distance A between sheave surfaces. It is sectional drawing which shows the state which contact | abutted the apparatus main body to the sheave surface in the state in which the reference plane is not parallel to a generatrix. It is sectional drawing which shows the state which contact | abutted the apparatus main body to the sheave surface along the bus-line.

  A sheave surface distance measuring device 1 (hereinafter, abbreviated as “measuring device 1”) according to an embodiment of the present invention includes a guide member 2 and an apparatus main body attached to the guide member 2, as shown in FIG. 3. As shown in FIG. 2, the measuring device 1 is used for measuring the distance between sheave surfaces of the continuously variable transmission 100. One pulley shaft (the pulley shaft 21 on the S side in this embodiment) The movable sheave is removed from the pulley shaft, and the guide member 2 is fitted to the pulley shaft 21 for use.

  The guide member 2 has a cylindrical portion 2a fitted to one pulley shaft (S-side pulley shaft 21 in this embodiment) and a support portion 2b extending from the cylindrical portion 2a toward the outer diameter. The support portion 2 b extends in a direction approximately parallel to the generatrix direction of the sheave surface 22 a of the fixed sheave 22 in a state where the cylindrical portion 2 a is fitted to the pulley shaft 21.

  As shown in FIG. 3, the apparatus main body 3 includes a base portion 4, a measuring instrument 5 fixed to the base portion 4, and a float portion 6 that is slidably attached to the base portion 4. The base 4 has a substantially U-shape when viewed from the side, and includes a support 4a that is rotatably mounted on the support 2b of the guide member 2 via a pin 7, and a measuring instrument mounting 4b that protrudes from the support. And a float mounting portion 4c and a reference surface 4d that contacts the sheave surface 22a of the S-side fixed sheave 22. An attachment hole 4c1 for inserting the float part 6 is formed in the float attachment part 4c, and the attachment hole 4c1 is formed so as to penetrate in a direction orthogonal to the reference surface 4d. A spring 8 is disposed between the support portion 2 b and the base portion 4 of the guide member 2, and thereby the base portion 4 is urged to rotate around the pin 7. In the illustrated example, the base end side (pulley shaft 21 side) of the reference surface 4d of the base portion 4 is urged toward the side pressed against the sheave surface 22a.

  The measuring device 5 measures the distance between the measurement object 5a and the object to be measured (float portion 6 in the present embodiment) in a non-contact manner. For example, when the measuring instrument 5 approaches a metal object, The distance to the object to be measured is detected by the induced current generated in the circuit. Although not shown, the measuring device 5 is connected to a display unit such as a monitor through an amplifier having an oscillation unit, a detection unit, and an output unit, and the measurement result by the measuring device 5 is displayed on the display unit.

  The float part 6 is formed of a metal material, and includes a shaft part 6a and a head part 6b provided at an end of the shaft part 6a. The base 4 is provided so as to be slidable in a direction perpendicular to the reference surface 4d. Specifically, the shaft portion 6 a is inserted into the mounting hole 4 c 1 of the base portion 4, and the spring 9 is disposed between the head portion 6 b and the base portion 4. Due to the elastic force of the spring 9, the head 6 b of the float portion 6 can be biased toward the side pressed against the sheave surface 12 a of the P-side fixed sheave 12. Further, the end portion 6a1 of the shaft portion 6a is a flat surface, is parallel to the measuring surface 5a of the measuring instrument 5, and faces the measuring surface 5a. By disposing the measuring instrument 5 and the float portion 6 as described above, the measurement surface 5a and the end portion 6a1 of the float portion 6 are arranged in a direction orthogonal to the measurement surface 5a, that is, a direction orthogonal to the reference surface 4d of the base portion 4. The distance between can be measured.

  A method for measuring the distance between sheave surfaces by the measuring apparatus 1 having the above configuration will be described below.

  First, with the movable sheave 23 removed from the S-side pulley shaft 21, the cylindrical portion 2 a of the guide member 2 is fitted into the outer peripheral surface of the pulley shaft 21. Then, the reference surface 4 d of the base portion 4 of the apparatus body 3 is brought into contact with the sheave surface 22 a of the S-side fixed sheave 22. At this time, the apparatus main body 3 rotates around the pin 7 so that the reference surface 4d of the apparatus main body 3 can be brought into contact with the generatrix of the sheave surface 22a. As described above, since the measurement direction by the measuring instrument is a direction orthogonal to the reference surface 4d, the direction orthogonal to the generatrix is defined as the measurement direction by bringing the reference surface 4d into contact with the generatrix of the sheave surface 22a. can do. That is, only by fitting the guide member 2 to the pulley shaft 21, the apparatus main body 3 can be positioned so that the measurement direction by the measuring instrument 5 is perpendicular to the generatrix of the sheave surface 22a.

  In this state, the measuring device 1 is rotated around the pulley shaft 21, and the device main body 3 is passed between the sheave surfaces 12a and 22a of the fixed sheaves 12 and 22. While the measuring device 1 is rotated, the distance D between the measuring surface 5 a and the end 6 a 1 of the float unit 6 is measured by the measuring instrument 5. At this time, since the end portion 6a1 of the float portion 6 is a flat surface, even the non-contact type measuring device 5 can accurately measure the distance.

  FIG. 4 shows a relationship between the rotation angle θ of the measuring device 1 and the distance D between the measuring surface 5a of the measuring instrument 5 and the end 6a1 of the float portion 6 as an example of the measurement result. Since the float 6 does not move up and down after the measurement apparatus 1 starts rotating until the head 6b of the float 6 contacts the sheave surface 12a, the distance between the measurement surface 5a and the end 6a1 of the float 6 is It does not change (area B1 in FIG. 4). When the head portion 6b of the float portion 6 contacts the sheave surface 12a, the float portion 6 is gradually pushed down, and after passing through the shortest distance portion between the sheave surfaces, the float portion 6 is pushed up by the elastic force of the spring 8, The head 6b of the float part 6 is pressed against the sheave surface 12a (region B2 in FIG. 4). Thereafter, when the head portion 6b of the float portion 6 is separated from the sheave surface 12a, the float portion 6 does not move up and down, so the distance between the measurement surface 5a and the end portion 6a1 of the float portion 6 does not change (region B3 in FIG. 4).

  As shown in FIG. 4, the minimum value D1 in the region B1 is the minimum value of the distance between the measurement surface 5a and the end portion 6a1 of the float portion 6. Based on the value of D1, the distance between the sheave surfaces 12a and 22a of the fixed sheaves 12 and 22 can be obtained. That is, the total value of the minimum value D1, the thickness H of the measuring instrument mounting portion 4b and measuring instrument 5 of the base portion 4, and the length L of the float portion 6 is the distance A between the sheave surfaces 12a and 22a. (A = D1 + H + L).

  The present invention is not limited to the above embodiment. For example, in the above embodiment, the apparatus main body 3 is rotatably attached to the guide member 2, but the fitting accuracy between the guide member 2 and the pulley shaft 21, and the reference surface of the apparatus main body 3 with respect to the guide member 2 If the angle 4d is set with high accuracy, the guide member 2 may be fixed to the apparatus main body 3 so as not to rotate, or these may be integrally formed.

  Further, in the above embodiment, the case where the distance between sheaves is measured via the float unit 6 is shown. However, for example, if the measuring device can measure even a curved surface, the float unit 6 is omitted, and the measuring device 5 It is also possible to directly measure the distance between the measurement surface 5a and the P-side sheave surface 12a. In this case, it is desirable to place the measuring device 5 at a position close to the P-side sheave surface 12a, and to keep the measuring surface 5a and the sheave surface 12a as close as possible to allow measurement by the measuring device 5.

  In the above embodiment, the guide member 2 of the measuring device 1 is fitted to the pulley pulley 21 on the S side. On the contrary, the guide member 2 is fitted to the pulley shaft 11 on the P side. May be.

DESCRIPTION OF SYMBOLS 1 Sheave surface distance measuring apparatus 2 Guide member 3 Apparatus main body 4 Base part 4d Reference surface 5 Measuring device 6 Float part 10 Primary pulley 11 Pulley shaft 12 Fixed sheave 12a Sheave surface 13 Movable sheave 20 Secondary pulley 21 Pulley shaft 22 Fixed sheave 22a Sheave Surface 23 Movable sheave 100 continuously variable transmission

Claims (3)

A device for measuring a distance between sheave surfaces of a fixed sheave of a primary pulley and a secondary pulley in a continuously variable transmission,
A guide member that fits to the outer peripheral surface of the pulley shaft of one pulley, a device main body that is attached to the guide member and has a reference surface that comes into contact with the sheave surface, and a distance provided between the sheave surfaces that is provided in the device main body. And a sheave surface in which the reference surface of the apparatus main body is in contact with the sheave surface along the generatrix of one sheave surface in a state where the guide member is fitted to the outer peripheral surface of the pulley shaft. Distance measuring device.   The apparatus for measuring a distance between sheave surfaces according to claim 1, wherein the apparatus main body is rotatably attached to the guide member.   The measuring means has a float part slidable in a direction perpendicular to the reference plane, and a measuring instrument for measuring the distance between the float part in a non-contact manner, and one end of the float part is defined as the other sheave surface. The inter-sheave surface distance measuring device according to claim 1 or 2, wherein the abutment is possible and the other end of the float portion is a flat surface, and the distance from the flat surface is measured by a measuring instrument.

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