JP2010076039A - Assembling device for drive shaft - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an assembling device for a drive shaft, capable of ensuring a working space through the miniaturization and simplification, and easily controlling the press-fitting operation at low cost. <P>SOLUTION: The assembling device 1 for the drive shaft comprises an output side member 4 which is engaged with a drive shaft 3 in the axial direction to output the sliding force in the axial direction to the drive shaft 3, an input side member 5 in which the rotational force (torque) around the axis orthogonal to the output direction of the sliding force with the output side member 4 is input, and a power transmission means 6 which is coupled with the input side member 5 via a screw fitting to transmit the torque input in the input side member 5 to the output side member 4 as the sliding force in the press-fitting direction. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a drive shaft assembling apparatus, and more particularly to an apparatus for differentially assembling a drive shaft by press-fitting.

  Conventionally, this type of assembling apparatus uses a hydraulic mechanism such as a hydraulic cylinder or a hydraulic pump in consideration of the press-fitting load (several hundred kgf) of the drive shaft to the differential.

For example, the press-fitting device disclosed in Patent Document 1 below shows an example, and the drive-shaft press-fitting device disclosed in the same document has hydraulic cylinders arranged in parallel to a pair of drive shafts arranged on the left and right sides of the differential. At the same time, the drive shaft is press-fitted into the differential gear by sandwiching the pair of drive shafts by a movable arm provided on the piston rod side of the hydraulic cylinder and a fixed arm provided on the cylinder side.
JP 63-7240 A

  As described above, if the drive shaft is press-fit and assembled to the differential unit alone, the press-fitting device disclosed in Patent Document 1 can be used. For example, for the purpose of increasing the assembly efficiency, a suspension member or the like is previously provided. When the drive shaft is press-fitted into the differential in a state where it is assembled to the differential peripheral member, the peripheral member such as the suspension member is obstructed, resulting in a problem that the press-fitting device having the above configuration cannot be used. In such a case, in order to continue the press-fit assembly using the hydraulic cylinder, it is necessary to dispose the hydraulic cylinder and the hydraulic pump on the outside (wheel side) of each drive shaft.

  FIG. 4 shows an example of the configuration, in which the left and right drive shafts 3, 3 are fitted to a differential gear (not shown) in the differential 2 assembled to the suspension member 7. Hydraulic cylinders 51 and 51 are disposed on the wheel sides of the left and right drive shafts 3 and 3, respectively. A hydraulic pump 52 is connected to each of the hydraulic cylinders 51, 51, and the hydraulic cylinder 51 is configured to engage with the drive shaft 3 and to expand and contract along the press-fitting direction, thereby operating the hydraulic pump 52. Thus, the hydraulic cylinders 51 and 51 are driven to press-fit the drive shaft 3 abutting on the differential side toward the differential 2 (internal gear).

  However, when adopting the above-described configuration, a hydraulic cylinder and a hydraulic pump must be arranged on the wheel side of the drive shaft, and the major axis direction of the hydraulic cylinder needs to be arranged in accordance with the vehicle width direction. Therefore, it is necessary to secure a large work space particularly in the vehicle width direction. This is contrary to the recent demands for factory equipment such as saving space and improving work efficiency, and may also increase capital investment.

  Further, in the above-mentioned Patent Document 1, as a method for controlling the press-fitting load, the working hydraulic pressure applied to the hydraulic cylinder is measured by a sensor and converted into the press-fitting load, or the load cell is applied to the end face of the piston rod of the cylinder. Although a means for detecting the press-fit load by directly pasting is disclosed, the control structure is complicated and lacks in maintainability. Also, the more complicated the control means, the higher the equipment cost.

  In view of the above circumstances, it will be described later to provide a drive shaft assembling apparatus that can secure a working space by downsizing and simplifying and that can easily control the press-fitting operation at a low cost. This is a technical problem to be solved by the present invention.

  The present invention has been made to solve the above problems. That is, the drive shaft assembly device according to the present invention is a drive shaft assembly device that performs assembly by press-fitting the drive shaft into the differential, and is engaged with the drive shaft in the axial direction, An output-side member that outputs a sliding force in the direction to the drive shaft, an input-side member that receives a torque around an axis that is orthogonal to the output direction of the sliding force by the output-side member, and a screw connection with the input-side member It is characterized by having a power transmission means which is connected and transmits torque inputted to the input side member to the output side member as a sliding force in the press-fitting direction.

  According to the above configuration, torque (rotational force) is input to the input side member from a direction orthogonal to the press-fitting direction of the drive shaft, so that the operator or torque input means is positioned on the wheel side of the drive shaft. The press-fitting work can be performed without any problems. Therefore, the facility space in the vehicle width direction can be shortened compared to the conventional case, and the work space for that can be secured. In addition, the power transmission means mechanically converts the rotational force input to the input side member into a sliding force for output, eliminating the need for large equipment such as a hydraulic cylinder or hydraulic pump. The cost required for equipment can be kept low.

  In addition, since the torque from the input side member is converted to linear motion in the direction orthogonal to the rotation axis via screw fitting and output to the output side member, the push amount in the press-fit direction corresponds to the rotation amount It can be evaluated in the form of. Therefore, it is possible to easily evaluate or detect the press-fitting load as compared with the conventional measurement method, and a simple structure for controlling the press-fitting load is sufficient.

  In this case, the assembling apparatus according to the present invention may have a portion that is positioned and fixed with respect to the differential or a member that is fixed relative to the differential. Here, the “member fixed relative to the differential” includes, for example, vehicle body components on which the differential is directly assembled, such as a suspension member, and these components are set to perform press-fitting work. Peripheral members other than parts, such as a workbench for performing, are also included.

  In this way, by providing a portion that is directly positioned and fixed to the differential or the like to be press-fitted, there is no need for a carriage or jig for placing the assembly device itself in the vicinity of the differential. There is no need to provide an installation space. Therefore, further space saving and simplification of the press-fitting device can be achieved, and work efficiency can be further improved.

  As described above, according to the present invention, it is possible to provide a drive shaft assembling apparatus that can secure a work space by downsizing with a simple configuration and can easily control the press-fitting operation at low cost. be able to.

  Hereinafter, an embodiment of a drive shaft assembling apparatus according to the present invention will be described with reference to the drawings.

  FIG. 1: has shown the principal part expanded side view of the assembly apparatus 1 of the drive shaft which concerns on one Embodiment of this invention. This assembling apparatus 1 is used when, for example, a drive shaft 3 is press-fitted and assembled to a differential 2 in a production line in a factory, and is engaged with the drive shaft 3 in the axial direction, An output side member 4 that outputs a sliding force to the drive shaft 3, an input side member 5 to which a rotational force (torque) about an axis orthogonal to the output direction of the sliding force by the output side member 4 is input, and the input side member 5 And a power transmission means 6 for transmitting torque input to the input side member 5 to the output side member 4 as a sliding force in the press-fitting direction. Here, the differential 2 is assembled on the suspension member 7, and the suspension member 7 is fixed on the mounting surface of the work table 8 and positioned. The assembling apparatus 1 having the above-described configuration is also provided for the other drive shaft (not shown).

  The input side member 5 has a substantially cylindrical shape, for example, is fitted with an impact wrench (not shown) and receives a torque from the wrench, and a fitting portion 9 is provided at one end. And the rod portion 10 that rotates integrally with the fitting portion 9 as torque is input. A thread groove is cut in the outer periphery of the rod portion 10 and is screwed into blocks 14 and 15 constituting a joint of a pair of foldable arms 11 and 11 described later.

  The power transmission means 6 has a structure using a screw type jack structure (herein, a so-called pantograph jack structure) as a whole, and a pair of folding arms 11, 11 and one end of the pair of folding arms 11, 11 are connected. It is mainly comprised by the base part 12 supported so that rocking is possible, and the slide part 13 which supports the other end of a pair of folding arms 11 and 11 so that rocking is possible on the differential side. Among these, the slide part 13 is fixed to the output side member 4 by means such as fastening. Further, the blocks 14 and 15 constituting the joints of the foldable arms 11 and 11 are respectively connected to the rod portion 10 of the input side member 5 through screw fitting. Here, the joint block 14 on the side close to the input side member 5 is connected to the rod portion 10 in a state of being freely rotatable and restricted in axial movement, and the joint block 15 on the side far from the input side member 5 is connected to the rod. As the portion 10 rotates, it is configured to move relative to the axial direction. Therefore, when the base portion 12 is fixed as described above and torque in a predetermined direction is input to the input side member 5, the rod portion 10 rotates in conjunction with the input side member 5. With this rotation, only one joint block 15 screwed to the rod portion 10 moves in the axial direction on the rod portion 10, and when the other joint block 14 approaches relatively, both folding arms 11 and 11 expand by the same amount, and contract when they are relatively separated. Therefore, with the expansion and contraction of the pair of foldable arms 11, 11, the output side member 4 fixed to the slide portion 13 linearly reciprocates in a direction perpendicular to the rotation axis of the input side member 5. Yes.

  A plurality of hooks 17 for connecting the suspension member 7 described above and the work table 8 for mounting and fixing the suspension member 7 at a predetermined position via wires 16 are provided on the base portion 12 of the power transmission means 6. Is attached. In addition, the same number of hooks 17 are attached to predetermined positions of the suspension member 7 and the work table 8 (refer to FIG. 1 for both), and the corresponding hooks 17 and 17 are connected by wires 16 respectively. The attaching device 1 is positioned and fixed with respect to the suspension member 7 and the work table 8 with reference to the base portion 12. Of course, the base 12 and the suspension member 7 or the work table 8 may be connected using a connecting means other than the wire 16.

  The output side member 4 closes the wheel side end portion of the drive shaft 3 and the outer cylinder portion 18 fitted at one end thereof, the other end of the outer cylinder portion 18, and is fixed to the slide portion 13 of the power transmission means 6. And a bottom plate portion 19. In this embodiment, the pressure input detecting means 20 is provided on the output side member 4. Specifically, the pin portion 21 is erected from the bottom plate portion 19 toward the differential side, and the drive shaft 3 fitted to the outer cylinder portion 18 and the shaft engaging portion 22 engaged on one end side thereof are provided. The pin portion 21 is slidably fitted. A large-diameter head portion 23 is formed on one end side of the shaft engaging portion 22, and a spring 24 is provided between the head portion 23 and the bottom plate portion 19 as means for converting pressure input into axial displacement. Are arranged in a compressed state. A limit switch 25 as a displacement detecting means is disposed in the vicinity of the shaft engaging portion 22, and a lever portion 26 extending from the limit switch 25 is connected to a part of the shaft engaging portion 22, here the head portion. 23 at a position spaced apart from the other end side in the axial direction (on the side of the bottom plate portion 19) by a predetermined distance. With the above configuration, when the outer cylindrical portion 18 of the output side member 4 receives the sliding force from the power transmission means 6 in the press-fitting direction, members other than the shaft engaging portion 22 and the spring 24 are integrally formed with the shaft engaging portion 22. Move in the press-fitting direction. Further, the spring 24 is compressed according to the amount of movement. Here, the pressure input (load) to the drive shaft 3 can be calculated according to the compression amount of the spring 24 by adjusting the elastic coefficient of the spring 24 and the axial length of the spring 24 when it is not press-fitted. Therefore, when the spring 24 is compressed by a length corresponding to a predetermined pressure input, the limit switch 25 is disposed at a position where the head portion 23 of the shaft engaging portion 22 is engaged with the lever portion 26 in the axial direction. Thus, the limit switch 25 can detect that the pressure input (load) has reached a predetermined value.

  Hereinafter, an example of the press-fitting operation using the drive shaft assembling apparatus 1 according to the above configuration will be described.

  First, as shown in FIG. 1, the assembling apparatus 1 having the above-described configuration is installed on one of the left and right drive shafts 3 fitted to the side gear of the differential 2. Specifically, the assembly device 1 is positioned and fixed with respect to the suspension member 7 and the work table 8 in a state where the wheel side end portion of the drive shaft 3 is fitted to the output side member 4 of the assembly device 1. Although not shown, the assembling apparatus 1 having the above-described configuration is installed in the same manner with respect to the other drive shaft.

  Then, from this state, a fitting shaft 9 of an impact wrench (not shown) (socket) of the impact wrench (not shown) is fitted to the fitting portion 9 of the input side member 5, and torque is input, so that the fitting portion 9 and the rod portion 10 are pivoted. While rotating around, the joint blocks 14 and 15 that are screw-fitted with the rod portion 10 move toward each other, and the pair of folding arms 11 and 11 extend toward the differential side. Thereby, the slide part 13 provided on the differential side of the foldable arms 11, 11 and the output side member 4 fixed to the slide part 13 slide along the axial direction of the drive shaft 3 and are fitted to the output side member 4. A pressure input is applied to the drive shaft 3 in the state.

  In this way, the press-fit assembly of the left and right drive shafts 3 to the side gear (not shown) of the differential 2 is performed, and the drive shaft assembly device provided on the other side causes the differential side gear of the other drive shaft. Press-fit assembly is performed.

  In this embodiment, the wheel side end portion of the drive shaft 3 is in a state of being axially engaged with the shaft engaging portion 22 constituting the output side member 4 and its one end side. Accordingly, the spring 24 disposed between the bottom plate portion 19 provided at the other end of the outer cylinder portion 18 and the shaft engaging portion 22 is compressed by a stroke corresponding to the pressure input to be output. Therefore, the axial force acting on the drive shaft 3 at the time of press-fitting can be detected as the compression amount of the spring 24 separately from the amount (the amount of movement of the drive shaft 3) in which the drive shaft 3 is actually press-fitted to the differential 2 side. Accordingly, as described above, the compression amount of the spring 24 corresponding to a predetermined pressure input is calculated in advance, and when this compression amount is reached, the shaft engaging portion 22 and the lever portion 26 of the limit switch 25 contact each other. It is possible to detect that the press-fitting load of the drive shaft 3 has reached a predetermined value by disposing the limit switch 25 at the position where it is to be performed. Since this detection operation uses the elastic characteristics of the spring 24, which is a mechanical element, it is excellent in maintainability (operation reliability).

  In this embodiment, the base 12 of the power transmission means 6 is positioned and fixed to the suspension member 7 to which the differential 2 is assembled and the work table 8 to which the suspension member 7 is set. The stroke amount of the output side member 4 is directly proportional to the rotation amount of the rod portion 10 of the input side member 5. This is because the rod portion 10 and the joint blocks 14 and 15 of the pair of folding arms 11 and 11 are connected by screw fitting. Therefore, the pressure input can be mechanically adjusted (controlled) from the torque input operation, and in any case, highly reliable press-fitting control can be achieved with a simple configuration.

  As mentioned above, although one Embodiment of the assembly apparatus of the drive shaft which concerns on this invention was described, of course, this invention is not limited to the said form, It is also possible to take another form.

  For example, in the above embodiment, the case where the pantograph jack structure is used for the power transmission means 6 has been described, but it is obvious that the structure is not particularly limited to this structure. As long as it has a screw fitting part between the input side member 5 and the torque input to the input side member 5 can be transmitted as a sliding force in the press-fitting direction to the output side member 4 through the screw fitting, In other words, as long as the rotation axis of the input torque and the output shaft are orthogonal to each other and power transmission between them is performed via the mechanical element, the form is arbitrary.

  Further, regarding the torque input to the input side member 5, as described above, it is possible to use a power tool such as an impact wrench or the like, and the operator may apply torque by turning the wrench manually. It is.

  Further, in the above description, the case where the drive shaft 3 is press-fitted into the differential 2 in a state assembled to the suspension member 7 set on the work table 8 is exemplified, but the press-fitting assembling form is not limited to this. . The present invention can also be applied to the case where the drive shaft 3 is press-fitted and assembled to the differential 2 alone, and without being set on the work table 8, for example, the differential 2 on the manufacturing line (peripheral members such as the suspension member 7 can be assembled). Of course, the present invention can also be applied to the case where the drive shaft 3 is press-fitted and assembled with respect to whether or not there is any.

It is a side view at the time of use of the assembly apparatus of the drive shaft which concerns on one Embodiment of this invention. It is a top view of the assembly apparatus of the drive shaft shown in FIG. It is a principal part expanded sectional view of the assembly | attachment apparatus of the drive shaft shown in FIG. It is a whole block diagram of the assembly apparatus of the conventional drive shaft.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drive shaft assembly apparatus 2 Differential 3 Drive shaft 4 Output side member 5 Input side member 6 Power transmission means 7 Suspension member 8 Work table 9 Fitting part 10 Rod part 11, 11 Folding arm 12 Base part 13 Slide part 14 , 15 Joint block 16 Wire 17 Hook 18 Outer cylinder part 19 Bottom plate part 20 Pressure input detection means 21 Pin part 22 Shaft engaging part 23 Head part 24 Spring 25 Limit switch 26 Lever part 51, 51 Hydraulic cylinder 52 Hydraulic pump

Claims (2)

A drive shaft assembly device that performs assembly by press-fitting a drive shaft into a differential,
An output side member that engages with the drive shaft in an axial direction and outputs an axial sliding force to the drive shaft;
An input side member to which a torque around an axis orthogonal to the output direction of the sliding force by the output side member is input;
Drive shaft assembly apparatus comprising: power transmission means coupled to the input side member through screw fitting, and transmitting torque input to the input side member to the output side member as a sliding force in the press-fitting direction. .   The drive shaft assembling apparatus according to claim 1, further comprising a portion that is positioned and fixed with respect to the differential or a member that is fixed relative to the differential.

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