JP2009519408A - Conical belt car pair for conical belt car winding transmission - Google Patents

Abstract

  The present invention relates to a conical belt wheel pair for a conical belt wheel winding transmission. This pair of conical belt wheels has an input shaft that is firmly coupled to a fixed belt wheel, a movable belt that is slidable in the axial direction with respect to the input shaft, but is not relatively rotatable, and a torque sensor device. The torque sensor device has a molding surface that is non-rotatably coupled to the input shaft, and a molding surface that is different from the molding surface. The input shaft is firmly connected to a sensor piston that is slidable and rotatable in the axial direction relative to the input shaft, and the two molding surfaces are connected to the sensor piston and the movable The configuration is such that when the effective torque changes between the belt wheel and the axial position of the sensor piston, the rolling element disposed between the two molding surfaces changes along the molding surface. And the sensor piston is On the opposite side to the moving belt wheel, there are arms that are axially oriented and spaced apart from each other in the circumferential direction. These arms can rotate on the input shaft and slide almost in the axial direction. Is engaged with an axial tooth row formed on the peripheral surface of the rotationally driven input gear, and is provided with a support ring, and the support ring is provided on the tooth row of the arm. The side facing in the radial direction is in contact with the arm so that the tooth row of the arm meshes with the circumferential row of teeth of the input gear.

Description

  The present invention relates to a conical belt wheel pair for a conical belt wheel winding transmission.

  For example, a conical belt wheel winding transmission device used for an automobile generally has two conical belt wheel pairs, and a winding means such as a special chain is wound around these conical belt wheel pairs. The gear ratio of the transmission can be continuously changed by changing the distance between the conical belt wheels of each conical belt wheel pair in opposite directions.

  The conical belt wheel pair preferably has a torque sensor incorporated on the drive side, by which the torque from the drive motor is detected and the pressing force between the conical belt wheel of the corresponding conical belt wheel pair. Can be changed according to the torque. If the torque sensor is located directly in the space between the movable belt wheel and the support ring wall that is rigidly connected to the shaft of the conical belt wheel pair and supports the movable belt wheel of the conical belt wheel pair, the torque This is advantageous because of the compact structure of the sensor. In order to make this possible, the sensor piston belonging to the torque sensor has an axial arm that projects through the support ring wall, for example by a drive motor outside the support ring wall. It meshes with the input gear to be driven.

  Based on the meshing of the teeth that transmit the full output or moment of the drive motor, the arm of the sensor piston with the dentition is required to be formed more accurately than the high mechanical requirements, i.e. high value materials. And high mechanical requirements are imposed which can cause problems related to sustainability during long-term operation.

  The subject of this invention is solving the above problems. In other words, it provides the possibility of constructing a conical belt wheel pair so that the arm of the sensor piston can be manufactured in an inexpensive manner with high sustainability.

  This problem is solved by the conical belt wheel pair described in the characterizing part of claim 1.

  Advantageous embodiments of the conical belt wheel pair according to the invention are described in the dependent claims.

  A conical belt wheel pair for a conical belt wheel winding transmission according to the present invention includes an input shaft firmly coupled to a fixed belt wheel and is slidable in the axial direction with respect to the input shaft, but is not relatively rotatable. A movable belt disposed; and a torque sensor device, the torque sensor device comprising: a molding surface coupled to the input shaft so as not to rotate relative to the input shaft; and a molding surface different from the molding surface. And the another molding surface is firmly coupled to a sensor piston that grips the input shaft and is slidable and rotatable in an axial direction relative to the input shaft; When the effective torque changes between the sensor piston and the movable belt wheel, the two molding surfaces have the axial position of the sensor piston changed from the rolling element disposed between the two molding surfaces to the molding surface. To change by rolling along The sensor piston has arms directed in the axial direction and spaced apart from each other in the circumferential direction on the side opposite to the movable belt wheel, and these arms are connected to the input shaft. Is engaged with an axial tooth row formed on a peripheral surface of an input gear that can be rotated and driven so as to be slidable substantially in the axial direction, and a support ring is provided. The side of the support ring that faces the dentition of the arm in the radial direction abuts on the arm, and meshes the dentition of the arm with the circumferential dentition of the input gear.

  The support ring provided according to the invention directly supports the radial force acting on the arm. The force acting in the circumferential direction is also carried by the support ring.

  The tooth row provided on the peripheral surface of the additional portion in the axial direction of the sensor piston can be configured, for example, radially outward if the input gear is configured to include an internal tooth row.

  The support ring is advantageously abutted against the free end region of the arm.

  Furthermore, it is advantageous for the transmission of force if the support ring does not overlap the arm dentition.

  It is particularly advantageous if the support ring is fixed to the arm by snap engagement.

  If the support ring is bilaterally symmetrical with respect to a rotation of 180 ° about the axis including the diameter of the support ring, it is advantageous for secure assembly.

  Furthermore, it is advantageous if the support ring is provided on its end face side with a pre-centering step which can be fitted with free play on the free end of the sensor piston arm.

  The invention is explained in detail below with the aid of schematic drawings.

FIG. 1 is a longitudinal sectional view of a conical belt wheel pair,
FIG. 2 is a longitudinal sectional view of a conical belt wheel pair similar to that of FIG. 1 having an axially shifted sensor piston;
FIG. 3 is a diagram showing details of the support ring when it is fitted on the arm,
FIG. 4 is a view similar to FIG. 3, showing details of the support ring fitted over the arm.

  According to FIG. 1, the conical belt wheel pair of the conical belt wheel winding transmission device has an input shaft 10, and this input shaft 10 is configured integrally with a fixed belt wheel 12. A movable belt wheel 14 coupled to the shaft 10 is disposed on the shaft 10 so as to be slidable in the axial direction but not relatively movable (that is, to rotate together). The winding means not shown circulates between the conical surface of the fixed belt wheel 12 and the conical surface of the movable belt wheel 14 and between the conical surfaces of another conical belt wheel pair not shown. Run.

  A cylinder ring 16 having two wall portions spaced in the radial direction is firmly fixed to a radially outer region on the rear side of the movable belt wheel 14, and a piston 18 operates in the cylinder ring 16. In FIG. 1, a first pressure chamber 20 is formed on the right side of the piston 18 in FIG. 1. The pressure chamber 20 includes a radial hole 22 formed in the movable belt wheel 14, and a movable belt. The annular chamber 24 between the wheel 14 and the shaft 10, the radial hole 26 formed in the shaft 10, and the axial hole 28 can be loaded with hydraulic pressure. This hydraulic pressure can be changed to adjust the transmission ratio.

  The generally annular piston 18 is rigidly coupled to the generally cup-shaped support ring wall 30, which is rigidly coupled to the shaft 10. On the inside, an annular component 34 with a molding surface 32 is firmly fixed to the support ring wall 30.

  In the support ring wall 3, a sensor piston 36 configured in a generally annular shape is sealed against the outer peripheral surface of the shaft 10 and the inner peripheral surface of the annular component 34, and is arranged so as to be slidable in the axial direction. Has been. The sensor piston 36 includes a projection directed toward the movable belt wheel 14, and a molding surface 38 is formed on the rear side of the projection. The molding surface 38 is a surface facing the molding surface 32. Is forming. Between the molding surfaces 32 and 38 are arranged rolling elements, in the illustrated embodiment spheres 40.

  A second pressure chamber 42 is formed between the sensor piston 36 and the movable belt wheel 14, and this second pressure chamber 42 is hydraulically connected via an introduction conduit 44 guided through a shaft. Can be loaded. In this case, the hydraulic medium can be led out via a lead-out conduit 46 also formed in the shaft 10.

  The effective cross section of the introduction opening 48 leading to the second pressure chamber is defined by the position of the movable belt wheel 14 in the axial direction. The free cross section of the outlet opening 50 guided out of the second pressure chamber is defined by the position of the sensor piston 36. The sensor piston 36 protrudes through a plurality of notches in the support ring wall 30 with a plurality of arms 52 which are advantageously arranged at the same interval in the circumferential direction. The radially outer surfaces of these arms 52 are provided with tooth rows oriented in the axial direction and in the radial direction, and these tooth rows mesh with the inner tooth row of the input gear 54. The input gear 54 is supported on an outer shell 56 of the bearing, indicated as a whole by the reference numeral 58, so that it cannot slide in the axial direction.

  The configuration and function of the conical belt wheel pair described above are well known and will not be described in detail.

  In the torque acting on the sensor piston 36 from the rotationally driveable input gear 54, the torque is transmitted to the support ring wall 30 and eventually the shaft 10 via the molding surface 38, the sphere 40 and the molding surface 32. These molding surfaces 38, 32 move to the right as the torque of the sensor piston 36 increases as shown in FIG. 1, so that the basic position or initial position of the conical belt wheel pair shown in FIG. The outlet opening 50 whose position is not completely covered by the sensor piston is gradually closed. FIG. 2 shows the device of FIG. 1 at very high torque. At this very high torque, the sensor piston is slid to the right as much as possible and the outlet opening 50 is completely covered. As the effective size of the outlet opening 50 gradually decreases, the pressure in the second pressure chamber 42 increases, so that a pressing force related to the input torque acts on the movable belt wheel 14.

  According to the present invention, a support ring 60 is provided to support the free end of the arm 52 of the sensor piston, this support ring 60 abutting radially inward of the end region of the arm 52, Since the end region of the arm is pushed outward, the external tooth row of the arm surely meshes with the internal tooth row of the input gear 54.

  The arm 52 is advantageously formed in a ring part welded to the sensor piston, as shown, and projects axially from this ring part. In this manner, the load of the welded portion of the arm or ring portion is reduced against the bending force that directly acts on the arm in the circumferential direction.

  3 and 4 show a portion of the free end region 62 of the support ring 60 and arm 52 by enlarging the region indicated by the circle in FIGS. In this case, only one of each of the at least three arms is shown.

  3 and 4 show an external tooth row 64 of the arm 52, which meshes with an internal tooth row of the input gear 54 that is not labeled. As shown in FIGS. 1 and 2, the outer tooth row 64 is slidable in the axial direction relative to the inner tooth row, thereby ensuring the axial slidability of the sensor piston. Is done.

  According to FIG. 3, the inner side of the end region 62 of each arm 52 is provided with a notch 66, and the end surface side of the notch 66 ends with a projecting surface 68. The support ring 60 has an outer surface 70 facing outward in the radial direction. The outer surface 70 corresponds to the notch 66 but is configured to be slightly larger than the notch 66, It shifts to the end face of the support ring via the centering step 72.

  The cross-section of the support ring 60 is advantageous in that it moves inwardly when the support ring 60 rotates 180 ° in the diametrical direction, ie from both sides, into the arms 52 spaced circumferentially. It is configured to be slid. Since the radial diameter of the preliminary centering step 72 of the support ring 60 is slightly smaller than the minimum diameter of the projection surface 68, for example, by 0.05 mm, the support ring 60 is fitted over the end portion of the arm 52 on the end surface side. Automatically centered. As the support ring 60 is further fitted over the arm 52, the end region 62 of the arm 62 is expanded until the support ring 60 is inserted into the notch 66 and springs back the end region 62. The protrusion surface 68 snap-engages with the support ring outer surface 70 from behind. The surplus dimension of the maximum diameter portion of the outer surface 70 of the support ring 60 that exceeds the maximum inner diameter of the notch 66 is, for example, 0.15 mm.

  As shown in the figure, the support ring 60 is preferably located slightly outside in the axial direction of the external tooth row 64 when inserted into the arm 52, and within the region of the external tooth row 64, the arm 52 is located. Has a greater thickness in the radial direction than in its end region 62.

  For the shape stability of the arm 52 not only in the radial direction but also in the circumferential direction, the outer surface 70 and the inner surface of the notch 66 may be knurled in the axial direction.

  With the support ring of the present invention, the bending of the arm 52 in the previous processing stage can be pushed back and corrected, so that the teeth of the arm can be reliably meshed with the teeth of the input gear.

  In forming the dentition on the arm, a relatively narrow tolerance for the slow interface can be maintained by the support ring (notch 66). Regardless of the arm delay that then occurs, the arm with the dentition is pushed into the corrected position by inserting a support ring.

  In the above embodiments, the support ring does not require additional space. This is because the support ring is arranged in the annular chamber formed between the bearing 58, the arm 52 and the seal support in the end region of the thin walled arm.

  The fixing of the support ring, which takes place via the snap engagement as described above, is a weld or solder between the support ring and the arm in a nearly complete belt wheel pair, for a mechanically rigid connection, for example welding. There is no need to provide an attaching portion, and there is an advantage that a remarkably high force is generated in the material bonding based on the forced movement between the support ring and the arm.

  The snap engagement type fixing portion may have various configurations. For example, a narrow snap projection may be formed on the support ring, and in this case, radial support portions may be obtained on the left and right sides of the projection. Optionally, a wide snap projection may be formed on the ring. In this case, as shown in FIGS. 3 and 4, a radial support portion is formed directly on the protrusion, and snap engagement is performed on both sides of the protrusion.

  When assembling the support ring, it is advantageous to monitor the force / stroke characteristic curve (characteristic curve indicating the relationship between force and stroke) when the ring is inserted into the arm during assembling. This guarantees a perfect snap connection.

  In order to obtain a geometrically optimal snap engagement, it is advantageous if the support ring is deviated from a symmetrical configuration that can be assembled from both sides.

  The arm that is firmly connected to the sensor piston is advantageously surface hardened or carbonitrided. The support ring is advantageously hardened or carbonitrided from steel, hardened steel, for example ETG 100 with Rm≈1000 MPa, without further heat treatment or using other steels.

  It is advantageous if a support ring is fitted over when measuring a soft-worked component having an arm with a dentition.

  It is also advantageous if the support ring is fitted during the heat treatment process in order to shorten the delay.

  In the above-described embodiment, the arm 52 has a dentition on its outer side, so that the support ring 60 is disposed in the arm. Optionally, the arm is provided with a dentition on its inner side and cooperates with the outer dentition of the input gear. A support ring is then placed radially outward of the arm to push the arm inward and mesh with the input gear.

It is a longitudinal cross-sectional view of a conical belt wheel pair. FIG. 2 is a longitudinal sectional view of a conical belt wheel pair similar to FIG. 1 with a sensor piston shifted in the axial direction. It is an enlarged view of the part shown by III of FIG. 1 which shows the detail of the support ring at the time of putting on an arm. FIG. 4 is a view similar to FIG. 3, showing details of the support ring fitted on the arm.

Explanation of symbols

  10 input shafts, 12 fixed belt wheels, 14 movable belt wheels, 16 cylinder rings, 18 pistons, 20 first pressure chambers, 22 holes, 24 annular chambers, 26 radial holes, 28 axial holes, 30 support ring walls, 32 molding surface, 34 annular component, 36 sensor piston, 38 molding surface, 40 ball, 42 second pressure chamber, 44 introduction pipe, 46 lead-out pipe, 48 lead-in opening, 50 lead-out opening, 52 arm, 54 Input gear, 56 outer shell, 58 bearing, 60 support ring, 62 end region, 64 external tooth row, 66 notch, 68 projection surface, 70 outer surface, 72 preliminary centering step

Claims (7)

A conical belt wheel pair for a conical belt wheel winding transmission,
An input shaft (10) firmly coupled to the fixed belt wheel (12);
A movable belt (14) arranged to be slidable in the axial direction on the input shaft (10), but not relatively rotatable;
A torque sensor device,
The torque sensor device has a molding surface (32) coupled to the input shaft (10) so as not to be relatively rotatable, and a molding surface (38) different from the molding surface (32), The other molding surface (38) grips the input shaft (10) and is slidable and rotatable in the axial direction relative to the input shaft (10). When the effective torque changes between the sensor piston and the movable belt wheel, the two piston surfaces (32, 38) are firmly connected to each other. The rolling element (40) disposed therebetween changes so as to roll along the molding surface, and the sensor piston (36) is opposite to the movable belt wheel (14). Sideways, spaced in the circumferential direction and oriented in the axial direction Of the input gear (54) capable of being driven to rotate and supported by the input shaft (10) so as to be rotatable and substantially slidable in the axial direction. It is designed to mesh with the axial teeth formed on the peripheral surface,
A support ring (60) is provided, and the side of the support ring (60) facing the dentition of the arm in the radial direction is in contact with the arm, and the dentition of the arm is arranged in the circumferential direction of the input gear. A conical belt wheel pair for a conical belt wheel winding transmission device, characterized in that it is adapted to mesh with the gear wheel.   2. The conical belt wheel pair according to claim 1, wherein the dentition (64) of the arm (52) of the sensor piston (36) is formed radially outward.   The conical belt wheel pair according to claim 1 or 2, wherein the support ring (60) abuts a free end region (62) of the arm (52).   The conical belt wheel pair according to any one of claims 1 to 3, wherein the support ring (60) does not overlap a tooth row (64) of the arm (52).   The conical belt wheel pair according to any one of claims 1 to 4, wherein the support ring (60) is fixed to the arm (52) by snap engagement.   6. The conical belt wheel pair according to claim 1, wherein the support ring (60) is symmetrical with respect to a rotation of 180 [deg.] About an axis including a diameter of the support ring. .   A preliminary centering step is formed on the end face side of the support ring (60), and the preliminary centering step can be fitted over the free end of the arm (52) of the sensor piston (36) while maintaining play. A conical belt wheel pair according to any one of claims 1 to 6.

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