JP4561127B2 - Rotating member mounting structure and power mechanism using the same - Google Patents

Description

  The present invention relates to a rotating member mounting structure and a power mechanism using the same, and more specifically, a first rotating member having a convex end formed in a convex shape and a convex end of the first rotating member. The present invention relates to a rotating member mounting structure for mounting a second rotating member having a concave end formed in a concave shape so as to be fitted together so as to rotate integrally coaxially and a power mechanism using the same.

  Conventionally, this type of rotating member mounting structure includes a rotating shaft of a motor provided with a resolver for detecting a rotating state in a hybrid vehicle that outputs power input / output from an engine or motor to a driving shaft via a planetary gear. And a planetary gear sun gear shaft are generally known so as to rotate together. In this mounting structure, a shim or the like is provided between the two rotating shafts so that the axial overlap amount between the resolver rotor attached to the motor rotating shaft and the resolver stator attached to the case is equal to or greater than a predetermined amount. To adjust the position in the axial direction so that the resolver functions normally.

  However, in the above-described mounting structure, a shim or the like provided between the two rotating shafts may be worn due to a thrust force acting from the sun gear shaft, and the axial position may fluctuate. As a result, when the overlap amount of the resolver is insufficient due to the change in the position of the rotation shaft of the motor, the rotation state cannot be detected. Such an abnormality such as a resolver seriously affects the operation control of a hybrid vehicle or the like, and it is desirable to prevent it more reliably.

  An object of the mounting structure of a rotating member and a power mechanism using the same of the present invention is to suppress variation in the axial position of the rotating member within a range in which a device installed on the rotating member functions normally.

  The rotating member mounting structure of the present invention and the power mechanism using the same adopt the following means in order to achieve the above-mentioned object.

The mounting structure of the rotating member of the present invention is
A first rotating member having a convex end formed in a convex shape, and a second rotating member having a concave end formed in a concave shape so as to be fitted to the convex end of the first rotating member; Is a mounting structure that is attached to rotate integrally on the same axis,
When connecting a part of the protrusion outer peripheral surface of the convex end of the first rotating member and a part of the inner peripheral surface of the skirt of the concave end of the second rotating member, the convex end The larger one of the two gaps, the gap formed between the tip of the projecting portion and the bottom of the concave end portion and the gap formed between the shoulder portion of the convex end portion and the tip of the skirt portion of the concave end portion A position adjusting member for adjusting the axial position of the two rotating members is interposed in the gap, and the convex end of the smaller one of the two gaps as the rotating member moves in the axial direction. The axial position of the normal function range in which the predetermined position that the axial position of the rotating member is installed in the rotating member and functions in accordance with the rotation of the rotating member when the concave end is in contact with the concave end portion Two rotating members are attached so that

  In the rotating member mounting structure according to the present invention, two protrusions generated when the outer peripheral surface of the protruding end of the first rotating member and the inner peripheral surface of the skirt of the concave end of the second rotating member are connected. When the position adjustment member is interposed in the larger gap among the gaps in the axial direction, and the convex end and the concave end of the smaller gap come into contact with the movement of one of the rotating members, The two rotating members are attached so that the predetermined device installed on the moved rotating member is in a range where it normally functions. Therefore, even if the axial position of the rotating member fluctuates due to wear or the like of the position adjusting member interposed in the larger gap, the rotating end member comes into contact with the convex end and the concave end of the smaller gap. The position in the axial direction can be set within a range in which the predetermined device functions normally. That is, the change in the axial position of the rotating member can be suppressed within a range where the predetermined device functions normally. Here, “the skirt portion of the concave end portion” means a cylindrical portion surrounding the depressed portion of the concave end portion, and “the shoulder portion of the convex end portion” means a portion corresponding to the shoulder of the convex end portion. Indicates.

  In such a rotating member mounting structure of the present invention, the position adjusting member is provided between the shoulder portion of the convex end portion of the first rotating member and the skirt portion tip of the concave end portion of the second rotating member. It can also be an annular member interposed in the generated gap. Here, examples of the “annular member” include a snap ring.

  Further, in the rotating member mounting structure of the present invention, a part of the outer peripheral surface of the protruding portion of the convex end portion of the first rotating member and a part of the inner peripheral surface of the skirt portion of the concave end portion of the second rotating member. Can be connected by spline connection. If it carries out like this, a rotation member can be connected using spline coupling.

  Further, in the rotating member mounting structure of the present invention, the predetermined device is a rotation detector that includes a stator installed at a predetermined location and a rotor mounted on the rotating member, and detects a rotating state of the rotating member, The normal function range is such that the amount of overlap in the axial direction between the stator and the rotor provided in the rotation detector is equal to or greater than a predetermined amount when the convex end and the concave end are in contact with each other. It can also be a range of the axial position. By so doing, fluctuations in the axial position of the rotating member can be suppressed within a range in which the rotation detector functions normally. Here, examples of the “rotation state” include a rotation angle and a rotation speed.

  In the rotating member mounting structure of the present invention, the predetermined device is a thrust bearing that is installed at an end opposite to the convex end or the concave end of the rotating member and supports the thrust force acting from the rotating member. And the normal function range is a predetermined width less than a axial width of the thrust bearing when a gap formed between the thrust bearing and the rotating member when the convex end and the concave end are in contact with each other. The range of the axial position of the rotating member can be as follows. By so doing, it is possible to suppress fluctuations in the axial position of the rotating member within a range in which the thrust bearing functions normally (within a range in which the thrust bearing does not fall off).

  In the rotating member mounting structure of the present invention, the first rotating member and / or the second rotating member may be a hollow member. In this way, the present invention can be applied to attachment of a hollow rotating member.

The power mechanism of the present invention is
A power mechanism for inputting / outputting power input / output from / to a motor to / from a drive shaft via a planetary gear mechanism,
The rotating shaft of any one of the three rotating elements of the planetary gear mechanism is the first rotating member or the second rotating member, and the rotating shaft of the motor is the second rotating member or the first rotating member. The rotating shaft of the rotating element and the rotating shaft of the motor are mounted using the rotating member mounting structure of the present invention according to any of the aspects described above as the rotating member.
This is the gist.

  The power mechanism of the present invention attaches the rotating shaft of any of the rotating elements of the planetary gear mechanism and the rotating shaft of the motor using the rotating member mounting structure of the present invention of any of the above-described aspects. Therefore, fluctuations in the axial position of the rotating shaft of the rotating element of the planetary gear mechanism and the rotating shaft of the motor can be suppressed within a range in which a predetermined device installed on the rotating shaft functions normally. In this aspect of the power mechanism of the present invention, the rotating shaft of the rotating element may be a sun gear shaft.

  Next, the best mode for carrying out the present invention will be described using examples.

  FIG. 1 is a configuration diagram showing an outline of the configuration of a hybrid vehicle 20 to which a rotating member mounting structure according to an embodiment of the present invention is applied. As illustrated, the hybrid vehicle 20 includes an engine 22, a planetary gear 30 connected to a crankshaft 26 as an output shaft of the engine 22 via a damper 28, a motor MG1 capable of generating electricity connected to the planetary gear 30, A reduction gear 35 attached to a ring gear shaft 32a as a drive shaft connected to the planetary gear 30 and a motor MG2 connected to the reduction gear 35 are provided.

  The planetary gear 30 includes an external gear sun gear 31, an internal gear ring gear 32 disposed concentrically with the sun gear 31, a plurality of pinion gears 33 that mesh with the sun gear 31 and mesh with the ring gear 32, and a plurality of pinion gears. A planetary gear mechanism that performs a differential action with the sun gear 31, the ring gear 32, and the carrier 34 as rotational elements. In the planetary gear 30, the crankshaft 26 of the engine 22 is connected to the carrier 34, the rotor shaft 36 of the motor MG1 is connected to the sun gear 31, and the reduction gear 35 is connected to the ring gear 32 via the ring gear shaft 32a. When the motor MG1 functions as a generator, the power from the engine 22 input from the carrier 34 is distributed to the sun gear 31 side and the ring gear 32 side according to the gear ratio. When the motor MG1 functions as an electric motor, the power is input from the carrier 34. The power from the engine 22 and the power from the motor MG1 input from the sun gear 31 are integrated and output to the ring gear 32 side. The power output to the ring gear 32 is finally output from the ring gear shaft 32a to the drive wheels 63a and 63b of the vehicle via the gear mechanism 60 and the differential gear 62.

  FIG. 2 is a cross-sectional view centering on a mounting portion between the sun gear 31 of the planetary gear 30 and the rotor shaft 36 of the motor MG1 mounted using the mounting structure of the rotating member of the present invention. As shown in the figure, the sun gear 31 is formed as a hollow cylindrical member having a convex end in the right direction in the figure, and the crankshaft 26 passes through the inside. An outward flange 98 is formed on the crankshaft 26 in the direction of the end opposite to the convex end of the sun gear 31 (left side in the figure). The outward flange 98 and the carrier 34 of the planetary gear 30 The pinion gear 33 held by the carrier 34 and the sun gear 31 are engaged with each other. In addition, a thrust bearing 72 is provided between the sun gear 31 and the outward flange portion 98 to support a thrust force acting by engagement of the sun gear 31 and the pinion gear 33 or the like.

  As shown in the figure, the rotor shaft 36 of the motor MG1 is formed as a hollow cylindrical member through which the crankshaft 26 passes, and has a concave end portion in the left direction in the figure. The convex end portion of 31 is fitted and rotates integrally with the sun gear 31 coaxially. The rotor shaft 36 is rotatably fixed to the case 76 via a bearing 74 attached to the outer peripheral surface of a cylindrical skirt portion 91 that surrounds the recessed portion of the concave end portion. Further, a rotor 82 of a resolver 80 is attached to the rotor shaft 36 on the right side of the bearing 74 in the drawing, and the rotation angle of the rotor shaft 36 is detected by the rotor 82 and the stator 84 of the resolver 80 attached to the case 76. is doing. The resolver 80 operates normally when the amount of overlap between the rotor 82 and the stator 84 in the rotation axis direction is a predetermined amount or more.

  As shown in the figure, the mounting portion between the sun gear 31 and the rotor shaft 36 is such that the outer peripheral surface of the projecting portion 90 of the convex end portion of the sun gear 31 and the inner peripheral surface of the skirt portion 91 of the rotor shaft 36 Splined. A snap ring 70 illustrated in FIG. 3 is installed between the shoulder portion 93 corresponding to the shoulder of the convex end portion of the sun gear 31 and the tip of the skirt portion 91 of the rotor shaft 36. Further, the position of the rotor shaft 36 in the rotation axis direction is adjusted. As shown in FIG. 3, the snap ring 70 is formed as an annular member having a cut 71, and when installed on the sun gear 31, the inner diameter of the snap ring 70 is equivalent to the outer diameter of the protruding portion 90 of the sun gear 31. The projecting portion 90 extends from the projecting end portion direction of the sun gear 31 and is installed at the base portion of the projecting portion 90. Here, in comparison with the case where the snap ring 70 is installed in the sun gear 31B of the conventional example illustrated in FIG. 4, in the conventional example, the annular step portion having an outer diameter smaller than that of the protruding portion 90 formed at the root portion of the protruding portion 90. The snap ring 70 is installed at 95, and when the inner diameter of the snap ring 70 is expanded, the snap ring 70 is deformed (expanded in the radial direction), and a gap is formed or eccentric with the outer peripheral surface of the annular step portion 95. Sometimes it was installed. On the other hand, in the sun gear 31 of the embodiment, since the snap ring 70 is installed without providing the annular step portion 95 at the base portion of the projecting portion 90, the snap ring 70 is expanded when the inner diameter of the snap ring 70 is increased compared to the conventional example. Even if 70 deform | transforms, it can install, without producing a clearance gap between the outer peripheral surfaces of the protrusion part 90. FIG.

  As shown in FIG. 2, a gap having a width L <b> 1 is formed between the tip end of the projecting portion 90 of the sun gear 31 and the bottom portion 94 of the concave end portion of the rotor shaft 36. The width L1 is smaller than the width L2 of the snap ring 70 in the rotation axis direction and the width L3 of the thrust bearing 72 in the rotation axis direction, and the position of the sun gear 31 and the rotor shaft 36 in the rotation axis direction is adjusted by the snap ring 70. The resolver 80 does not operate normally when the rotor shaft 36 moves in the direction of the sun gear 31 (left direction in the figure) with reference to the state of being in the state (that is, the overlap between the rotor 82 moved together with the rotor shaft 36 and the stator 84). The width is smaller than the movement width (the amount is less than the predetermined amount).

  Here, a case where the snap ring 70 is worn by a thrust force acting from the sun gear 31 is considered. When the snap ring 70 is worn, the sun gear 31 and the rotor shaft 36 can move in the direction of the rotation axis. However, even if the sun gear 31 moves in the direction of the rotor shaft 36 (rightward in the drawing) as the snap ring 70 is worn, the width L1 between the thrust bearing 72 and the sun gear 31 is smaller than the width L3 of the thrust bearing 72. Since the tip of the projecting portion 90 of the sun gear 31 abuts against the bottom portion 94 of the rotor shaft 36 when the gap is generated, it is possible to prevent the thrust bearing 72 from falling off. Even if the rotor shaft 36 moves in the direction of the sun gear 31 (left direction in the figure) as the snap ring 70 is worn, the overlap amount between the rotor 82 and the stator 84 is less than a predetermined amount. Since the bottom portion 94 of the rotor shaft 36 comes into contact with the tip of the projecting portion 90 of the sun gear 31 with a small movement width (width L1), it is possible to prevent the resolver 80 from operating normally.

  According to the mounting structure of the rotating member of the embodiment described above, the width L1 of the gap between the tip end of the protruding portion 90 of the sun gear 31 and the bottom portion 94 of the rotor shaft 36 is set to the width L2 of the snap ring 70 and the width of the thrust bearing 72. Since the width is smaller than L3 and smaller than the moving width in which the overlap amount of the rotor 82 and the stator 84 of the resolver 80 is less than a predetermined amount, the shoulder portion 93 of the sun gear 31 and the tip of the skirt portion 91 of the rotor shaft 36 Even if the snap ring 70 installed between the sun gear 31 and the rotor shaft 36 moves in the direction of the rotation axis, the tip of the projecting portion 90 of the sun gear 31 and the bottom portion 94 of the rotor shaft 36 come into contact with each other. As a result, it is possible to prevent the thrust bearing 72 from dropping or the resolver 80 from operating normally. That is, the movement of the sun gear 31 and the rotor shaft 36 in the rotation axis direction can be suppressed within a range in which the thrust bearing 72 and the resolver 80 operate normally.

  Here, in the rotating member mounting structure of the embodiment, the sun gear 31 corresponds to the first rotating member, the rotor shaft 36 corresponds to the second rotating member, the snap ring 70 corresponds to the position adjusting member, and the resolver 80 corresponds to a rotation detector.

  In the rotating member mounting structure of the embodiment, the snap ring 70 is installed between the shoulder portion 93 of the sun gear 31 and the tip of the skirt portion 91 of the rotor shaft 36. Of course, other members may be used as long as the position in the direction can be adjusted.

  In the rotating member mounting structure of the embodiment, the outer peripheral surface of the projecting portion 90 of the sun gear 31 and the inner peripheral surface of the skirt portion 91 of the rotor shaft 36 are gear spline-coupled at the connecting portion 92. As long as the rotor shaft 36 and the rotor shaft 36 can be connected so as to rotate integrally with each other, they may be connected by other methods.

  In the rotating member mounting structure of the embodiment, the width L1 of the gap between the tip of the protruding portion 90 of the sun gear 31 and the bottom portion 94 of the rotor shaft 36 is smaller than the width L3 of the thrust bearing 72 in the rotation axis direction. In order to prevent the bearing 72 from falling off more reliably, the width L1 may be set to be smaller than a predetermined width L3 ′ smaller than the width L3 of the thrust bearing 72.

  In the mounting structure of the rotating member of the embodiment, the thrust bearing 72 is prevented from dropping off or the resolver 80 is not normally operated, but only one of them may be prevented. In this case, the width L1 of the gap between the tip end of the projecting portion 90 of the sun gear 31 and the bottom portion 94 of the rotor shaft 36 is smaller than the width L2 of the snap ring 70 and smaller than the width L3 of the thrust bearing 72, or It is sufficient that the width is smaller than the width L2 and smaller than the moving width at which the resolver 80 does not operate normally. Further, even if it is not the thrust bearing 72 or the resolver 80, other devices installed in the sun gear 31 or the rotor shaft 36 may be prevented from malfunctioning. In this case, the width L1 of the gap may be set so as to be smaller than the movement width of the sun gear 31 or the rotor shaft 36 so that the target device does not operate normally.

  In the embodiment, when the sun gear 31 of the planetary gear 30 and the rotor shaft 36 of the motor MG1 in the hybrid vehicle 20 are mounted, the rotating member mounting structure of the present invention is used, but the rotating member having the convex end and the concave shape are used. Of course, as long as the rotating member having the end portion is attached so as to rotate integrally on the same axis, the rotating member can be applied as a mounting structure for attaching other rotating members, and the rotating member is formed as a hollow cylindrical member. It doesn't have to be.

  The best mode for carrying out the present invention has been described with reference to the embodiments. However, the present invention is not limited to these embodiments, and various modifications can be made without departing from the gist of the present invention. Of course, it can be implemented in the form.

1 is a configuration diagram showing an outline of a configuration of a hybrid vehicle 20 to which a rotating member mounting structure according to an embodiment of the present invention is applied. It is sectional drawing centering on the attachment part of the sun gear 31 of the planetary gear 30 attached using the attachment structure of the rotating member of this invention, and the rotor shaft 36 of motor MG1. 2 is an external view of a snap ring 70. FIG. It is sectional drawing of the sun gear 31B of a prior art example.

Explanation of symbols

  20 hybrid vehicle, 22 engine, 26 crankshaft, 28 damper, 30 planetary gear, 31, 31B sun gear, 32 ring gear, 32a ring gear shaft, 33 pinion gear, 34 carrier, 35 reduction gear, 36 rotor shaft, 60 gear mechanism, 62 differential gear , 63a, 63b Drive wheel, 70 snap ring, 71 cut, 72 thrust bearing, 74 bearing, 76 case, 80 resolver, 82 rotor, 84 stator, 90 projecting portion, 91 skirt portion, 92 coupling portion, 93 shoulder portion, 94 Bottom, 95 annular step, 98 outward flange, MG1, MG2 motor.

Claims (6)

A first rotating member having a convex end formed in a convex shape, and a second rotating member having a concave end formed in a concave shape so as to be fitted to the convex end of the first rotating member; Is a mounting structure that is attached to rotate integrally on the same axis,
When connecting a part of the protrusion outer peripheral surface of the convex end of the first rotating member and a part of the inner peripheral surface of the skirt of the concave end of the second rotating member, the convex end The larger one of the two gaps, the gap formed between the tip of the projecting portion and the bottom of the concave end portion and the gap formed between the shoulder portion of the convex end portion and the tip of the skirt portion of the concave end portion A position adjusting member for adjusting the axial position of the two rotating members is interposed in the gap, and the convex end of the smaller one of the two gaps as the rotating member moves in the axial direction. The axial position of the normal function range in which the predetermined position that the axial position of the rotating member is installed in the rotating member and functions in accordance with the rotation of the rotating member when the concave end is in contact with the concave end portion characterized by attaching the two rotating members so as to be,
The predetermined device is a rotation detector that includes a stator installed at a predetermined location and a rotor attached to the rotating member, and detects a rotation state of the rotating member;
The normal function range is such that the amount of axial overlap between the stator and the rotor of the rotation detector is equal to or greater than a predetermined amount when the convex end and the concave end abut. The range of the axial position of the member,
Mounting structure for rotating members. A first rotating member having a convex end formed in a convex shape, and a second rotating member having a concave end formed in a concave shape so as to be fitted to the convex end of the first rotating member; Is a mounting structure that is attached to rotate integrally on the same axis,
When connecting a part of the protrusion outer peripheral surface of the convex end of the first rotating member and a part of the inner peripheral surface of the skirt of the concave end of the second rotating member, the convex end The larger one of the two gaps, the gap formed between the tip of the projecting portion and the bottom of the concave end portion and the gap formed between the shoulder portion of the convex end portion and the tip of the skirt portion of the concave end portion A position adjusting member for adjusting the axial position of the two rotating members is interposed in the gap, and the convex end of the smaller one of the two gaps as the rotating member moves in the axial direction. The axial position of the normal function range in which the predetermined position that the axial position of the rotating member is installed in the rotating member and functions in accordance with the rotation of the rotating member when the concave end is in contact with the concave end portion characterized by attaching the two rotating members so as to be,
The predetermined device is a thrust bearing installed at an end opposite to the convex end or the concave end of the rotating member and supporting a thrust force acting from the rotating member,
The normal function range is such that a gap generated between the thrust bearing and the rotating member when the convex end and the concave end are in contact with each other is equal to or less than a predetermined width smaller than an axial width of the thrust bearing. Is the range of the axial position of the rotating member,
Mounting structure for rotating members. The position adjusting member is an annular member interposed in a gap formed between a shoulder portion of a convex end portion of the first rotating member and a skirt portion tip of a concave end portion of the second rotating member. Item 3. The rotating member mounting structure according to Item 1 or 2 . Claims 1 to 3 connected by spline coupling a portion of the skirt inner peripheral surface of the recessed end portion of the first rotary member protruding end portion and the second rotary member of the protrusions the outer peripheral surface of the The mounting structure of any one of the rotating members. The first rotating member and / or said second rotary member is a hollow member according to claim 1 to 4 mounting structure of the rotating member according to any one. A power mechanism for inputting / outputting power input / output from / to a motor to / from a drive shaft via a planetary gear mechanism,
The rotating shaft of any one of the three rotating elements of the planetary gear mechanism is the first rotating member or the second rotating member, and the rotating shaft of the motor is the second rotating member or the first rotating member. claims 1 to 5 or according rotating member power mechanism with a mounting structure comprising mounting a rotary shaft of the rotary shaft and the motor of the rotating element as a rotating member.

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