A method for assembling an overrunning clutch

Abstract

The invention discloses an overrunning clutch assembly method, which comprises the steps of heating the components of the overrunning clutch in an oil bath; assembling the components heated in the oil bath to obtain a clutch assembly; measuring the unbalance amount of the clutch assembly, and performing balanced material removal at the material removal location of an outer gear according to the unbalance amount measurement result until the unbalance amount measurement is completed; applying a torsional torque to the clutch assembly after the unbalance amount measurement is completed, and completing the assembly of the overrunning clutch when the outer gear and the rotating shaft have no relative rotation; the invention can ensure the balance of the overrunning clutch by measuring the unbalance amount of the overrunning clutch, and can greatly reduce the installation error of the eccentric roller of the overrunning clutch and improve the assembly accuracy of the overrunning clutch by performing a torsional torque test on the overrunning clutch.

Description

Technical Field

[0001] The invention belongs to the technical field of clutch assembly, and in particular relates to an overrunning clutch assembly method. Background Art

[0002] The overrunning clutch is composed of a rotating shaft, an eccentric roller assembly, a clutch outer sleeve gear and bearings. When the starter is started, the electric starter drives the inner sleeve to rotate counterclockwise. The friction generated by the spring force is affected by the lift of the eccentric roller cam, so that the inner and outer wedge angles are smaller than the friction angle. The eccentric roller wedges the inner sleeve and the outer sleeve to complete the transmission of the starting torque. After the starter is successfully started, the electric starter stops working, the outer sleeve speed is higher than the inner sleeve speed, and the eccentric roller overcomes the pressure of the clutch spring under the action of its own centrifugal force, so that the eccentric roller is separated from the inner sleeve, and the starter motor is separated from the transmission gear system.

[0003] In the prior art, the related components on the transmission chain on the low-speed belt side need to continue to work with the main shaft rotor throughout the entire process after the main shaft rotor is rotated to a certain speed, which greatly increases the wear of the related transmission components on the low-speed belt side and increases the design cost; and there is no error-proofing requirement for the positional relationship of the eccentric roller in the clutch relative to the rotating shaft or the clutch outer gear. Summary of the invention

[0004] The purpose of the present invention is to provide an overrunning clutch assembly method to solve the problem that the assembly accuracy is difficult to ensure during the assembly process of the gas turbine starter accessory clutch.

[0005] The present invention adopts the following technical scheme: a method for assembling an overrunning clutch, comprising the following steps:

[0006] Heat the components of the overrunning clutch in an oil bath;

[0007] Assembling the components heated in the oil bath to obtain a clutch assembly;

[0008] Measure the unbalance of the clutch assembly, and perform balancing and material removal at the material removal location of the outer gear according to the unbalance measurement result until the unbalance measurement is completed;

[0009] Apply a torsional torque to the clutch assembly that has completed the unbalance measurement, and when the outer gear and the rotating shaft have no relative rotation, the overrunning clutch is assembled.

[0010] Further, applying a torsional torque to the clutch assembly for completing the unbalance measurement includes:

[0011] The rotating shaft is fixed, and a predetermined torsional moment is applied to the outer gear through the external meshing teeth.

[0012] Further, applying a predetermined torsional moment to the outer gear through the external meshing teeth includes:

[0013] The rotating rod with the internal meshing gear is meshed and connected with the outer gear; wherein a support rod is radially arranged on the outer periphery of the rotating rod, and a counterweight is installed at the free end of the support rod;

[0014] Engage and connect a slidable external gear rod having an externally meshed gear with the rotating shaft;

[0015] A counterweight of a predetermined weight is installed at the free end of the support rod, and the support rod is at a predetermined angle to the horizontal plane, so that a torsional moment of a predetermined magnitude is applied to the outer sleeve gear through the counterweight.

[0016] Further, measuring the unbalance of the clutch assembly includes:

[0017] Install the clutch assembly on the balancing machine and adjust the clutch assembly to be level;

[0018] Run the balancing machine to measure the unbalance of the clutch assembly, and stick wax mud of corresponding weight on the two correction surfaces of the clutch assembly according to the measurement results until the unbalance is less than the unbalance threshold.

[0019] Furthermore, before applying the torsional torque to the clutch assembly that has completed the unbalance measurement, the method further includes:

[0020] A sliding needle is used at the installation location of the eccentric roller assembly to slide in the opposite direction of the rotation direction of the outer sleeve gear to detect the swing state of the eccentric roller assembly.

[0021] Further, assembling the components after the oil bath heating includes:

[0022] The bearing, the elastic retaining ring and the locking plate are sequentially installed between the outer gear and the rotating shaft to obtain a clutch assembly; wherein the eccentric roller assembly is installed before the second bearing is installed.

[0023] The beneficial effects of the present invention are as follows: the present invention can ensure the balance of the overrunning clutch by measuring the imbalance of the overrunning clutch, and can greatly reduce the installation error of the eccentric roller of the overrunning clutch and improve the assembly accuracy of the overrunning clutch by performing a torsional torque test on the overrunning clutch. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the state of the eccentric roller when the rotating shaft of the overrunning clutch in the embodiment of the present invention rotates synchronously with the outer gear;

[0025] Figure 2 It is a schematic diagram of the overrunning state when N2 is greater than the disengagement speed in an embodiment of the present invention;

[0026] Figure 3 It is a schematic diagram of the overrunning state when N2 is less than the disengagement speed in an embodiment of the present invention;

[0027] Figure 4 is an axial cross-sectional schematic diagram of an overrunning clutch in an embodiment of the present invention;

[0028] Figure 5 It is a schematic diagram of the cross-sectional structure of the overrunning clutch at the cross section where the eccentric roller is located in an embodiment of the present invention;

[0029] Figure 6 This is a schematic diagram of the location where materials are removed in an embodiment of the present invention;

[0030] Figure 7 A schematic diagram of checking the swing state of the eccentric roller in an embodiment of the present invention;

[0031] Figure 8 A schematic diagram of checking the swing state K direction of the eccentric roller in an embodiment of the present invention;

[0032] Fig. 9 It is a structural schematic diagram of a torque applying device in an embodiment of the present invention;

[0033] Fig.10 Schematic diagram of the measurement of the end face runout of the bearing outer ring in an embodiment of the present invention.

[0034] Among them: 10. outer gear; 11. external meshing teeth; 20. rotating shaft; 21. internal meshing teeth; 30. bearing; 40. eccentric roller assembly; 50. locking plate; 60. elastic retaining ring; 70. material removal area; 80. torque application device;

[0035] 81. Internal meshing gear; 82. External meshing gear; 83. Counterweight; 84. Rotating rod; 85. Bottom plate; 86. Slidable external gear rod. DETAILED DESCRIPTION

[0036] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] In the installation of the eccentric roller, the difference between the roller height dimensions is no more than 0.002mm, and the difference between the height of the eccentric roller and the inner diameter of the clutch outer gear and the outer diameter of the shaft is 0.22±0.02mm. If the relative position relationship is wrong during installation, the clutch will not be able to play the role required by the design at all, and it is very easy to cause the clutch to fail when the starter is working because the eccentric roller of the clutch is installed in the wrong direction.

[0038] When the starter starts, the electric starter drives the rotating shaft 20 to rotate counterclockwise. The friction force generated by the spring force and the lift of the eccentric roller cam make the inner and outer wedge angles smaller than the friction angle. The eccentric roller wedges the rotating shaft 20 and the outer gear 10 to complete the transmission of the starting torque.

[0039] After the starter is started successfully, the electric starter stops working, the speed of the outer sleeve gear 10 is higher than the speed of the shaft 20, and the eccentric roller overcomes the pressure of the clutch spring under the action of its own centrifugal force, so that the eccentric roller is separated from the inner sleeve, and the starter is disengaged from the transmission gear system.

[0040] Specifically, the outer sleeve speed is defined as N2, and the inner sleeve speed is defined as N1. Starting state: before starting, N1>N2, for ground starting, N2=0, for air auxiliary starting, N2≠0; during the starting process, the rotating shaft 20 drives the eccentric roller, the separation ring, the spring and the outer sleeve gear 10 to rotate synchronously so that N2=N1, such as Figure 1 shown.

[0041] When N2 is greater than the disengagement speed, the overrunning state: the shaft 20 stops quickly under the action of the electric starter resistance torque, the outer gear 10 drives the eccentric roller, the separation ring and the spring to operate synchronously, and the eccentric roller overcomes the reaction force of the spring under the action of centrifugal force and throws off the inner sleeve, without contact with the shaft 20. Figure 2 shown.

[0042] When N2 is less than the disengagement speed, the overrunning state is as follows: the shaft 20 stops rotating, the outer gear 10 drives the eccentric roller, the separation ring and the spring to operate synchronously, the N2 speed is low, the eccentric roller cannot be thrown off the shaft 20, and the sliding friction is generated by contact with the shaft 20, such as Figure 3 shown.

[0043] In addition, if Figure 4 , 5 As shown in Figures 6 and 7, the overrunning clutch in the embodiment of the present invention comprises a rotating shaft 20 and an outer gear 10, with two front and rear bearings 30 therebetween, and components such as an eccentric roller assembly 40, a circlip 60 and a locking plate 50 are installed between the two bearings 30. An inner meshing tooth 21 is provided at one end of the rotating shaft 20, and an outer gear 10 is provided with an outer meshing tooth 11 on its periphery.

[0044] Based on the above working principle, the present invention discloses an overrunning clutch assembly method, comprising the following steps: heating the components of the overrunning clutch in an oil bath; assembling the components heated in the oil bath to obtain a clutch assembly; measuring the unbalance of the clutch assembly, and performing balancing and removing materials at the material removal location 70 of the outer gear 10 according to the unbalance measurement result until the unbalance measurement is completed; applying a torsional torque to the clutch assembly after the unbalance measurement is completed, and when the outer gear 10 and the rotating shaft 20 have no relative rotation, the assembly of the overrunning clutch is completed.

[0045] The present invention can ensure the balance of the overrunning clutch by measuring the unbalance amount of the overrunning clutch, and can greatly reduce the installation error of the eccentric roller of the overrunning clutch and improve the assembly accuracy of the overrunning clutch by performing a torsional torque test on the overrunning clutch.

[0046] In one embodiment, when the components of the overrunning clutch are heated in an oil bath, the clutch outer sheath gear 10, the rotating shaft 20, and the eccentric roller assembly 40 (including ten eccentric rollers, a separation ring, and a spring) are placed in a heating tank and heated in an oil bath using lubricating oil 4050, with a temperature of T: 80±10°C and a heat preservation time of S: 10±1min, so that the texture of the parts is uniform and convenient for subsequent assembly.

[0047] Then, the components heated in the oil bath are assembled, such as the bearing 30, the elastic retaining ring 60 and the locking plate 50 between the outer gear 10 and the rotating shaft 20 are installed in sequence to obtain the clutch assembly; wherein, the eccentric roller assembly 40 is installed before the second bearing 30 is installed.

[0048] Specifically, a bearing 30 is installed on the clutch outer gear 10 according to the assembly clearance requirement, and the clearance is generally an interference fit or transition fit. The elastic retaining ring 60 corresponding to the bearing 30 is installed on the bearing 30, and the position of the opening of the elastic retaining ring 60 corresponds to the position of the through groove of the clutch outer gear 10 for installing the locking plate 50.

[0049] Then, the lock plate 50 is installed in the groove position of the clutch outer gear 10, from the inner cavity of the clutch outer gear 10 to the outside, and the width of the lock plate 50 is greater than the width of the through groove, limiting the circumferential rotation of the elastic ring 60. Specifically, use a copper rod and a hammer to knock the two claws of the lock plate 50 on the outside of the clutch outer gear 10, and the angle of the two claws increases until it is greater than the width of the through groove on the clutch outer gear 10, limiting the radial movement of the lock plate. The stop ring corresponding to the bearing 30 is placed on the elastic ring 60.

[0050] Next, install the eccentric roller assembly 40 into the clutch outer gear 10, place the eccentric roller assembly on the aforementioned retaining ring, and tap the end face of the eccentric roller with a copper rod and a hammer to make the lower end face of the eccentric roller parallel and fit with the upper end face of the aforementioned retaining ring.

[0051] Then, repeat the above steps to sequentially install another retaining ring, a circlip 60, a locking plate 50 and a bearing 30 on the upper end surface of the eccentric roller assembly.

[0052] In one embodiment, measuring the imbalance of the clutch assembly includes: installing the clutch assembly on a balancing machine and adjusting the clutch assembly to be horizontal; running the balancing machine to measure the imbalance of the clutch assembly, and sticking wax mud of corresponding weight on two correction surfaces of the clutch assembly according to the measurement results until the imbalance is less than the imbalance threshold.

[0053] More specifically, adjust the distance between the first bearing surface of the balancing machine and the nearest material removal point 70, the distance between the two material removal points 70, and the distance between the second bearing surface and the nearest material removal point 70 as required, and install the belt, axial limit device and safety frame. Combine the dynamic balancing process shaft, install the clutch assembly on the balancing machine, and use a level to adjust it to the horizontal (that is, the overall axis of the clutch assembly is horizontal). After adjusting the level, apply a proper amount of lubricating oil to the left and right bearing positions, adjust the safety frame and axial limit device, tighten the belt, and check whether the axial dimension of the clutch assembly installation meets the design requirements.

[0054] Run the balancing machine to measure the imbalance of the clutch assembly. According to the measurement results, stick wax mud of corresponding weight on the light point phase displayed on the correction surface of the clutch assembly (including the first correction surface and the second correction surface), and then run the detection of rotor imbalance. If the remaining imbalance is less than the allowable imbalance (i.e., it is within the qualified range), it means that the measurement is accurate. Stop the machine and weigh the wax mud on the two correction surfaces. Before removing the wax mud, mark a line at the center of the wax mud with a marker.

[0055] Remove the wax sludge on the clutch assembly and first measure the initial unbalance of the rotor (i.e. perform the above process again). When the first correction surface is ≤3gmm and the second correction surface is ≤3gmm, you do not need to remove the material and can directly record the unbalance value.

[0056] Otherwise, when the measured unbalance exceeds the requirement, according to the quality displayed by the machine, the corresponding quality wax mud is applied. If it reaches the qualified range, when the following conditions occur: tol1 (the first correction surface) ≤ 3gmm, tol2 (the first correction surface) ≤ 3gmm, use a marker to record the weight of the material to be removed, mark the material removal area on the part, and balance and remove the material to eliminate the rotor unbalance. For smooth transition at the material removal area, you can first use oilstone to remove the material, and then use sandpaper to polish the material removal area.

[0057] Continue measuring, record the remaining imbalance tol1 and tol2, check the input of the clutch assembly balancing software (rotation speed) and the balancing quality and grinding quality of the clutch assembly.

[0058] Then, the second bearing, the second stop ring, the second locking plate 50, the second circlip 60 and the eccentric roller assembly 40 are removed in sequence. The first locking plate 50 is tightened, and the ten eccentric rollers are gently pulled out from the inside to the outside. The end of the eccentric roller marked with a "+" sign should be on the same side as the spline end of the shaft 20; then the eccentric roller assembly 40 is installed in the clutch outer gear 10; and then the shaft 20, the stop ring, the circlip 60 and the locking plate 50 are installed.

[0059] Then, a sliding needle is used at the installation position of the eccentric roller assembly 40 to slide in the opposite direction of the rotation direction of the outer gear 10 to detect the swing state of the eccentric roller assembly 40 .

[0060] Specifically, use a sliding needle to check the eccentric roller, such as Figure 8 As shown, it should be possible to ensure that the sliding needle slides in the direction of arrow K, and the spring installed in the end face groove is not allowed to be exposed; check the clutch assembly, fix the shaft 20, and rotate the outer gear 10 clockwise, and the clutch will be locked (from the direction facing the shaft spline, counterclockwise arrow E direction, such as Figure 7 When the shaft is clamped with a torque of 9.8±0.2Nm, the roller is not allowed to swing.

[0061] In one embodiment, applying a torsional torque to the clutch assembly for completing the unbalance measurement includes: fixing the rotating shaft 20 , and applying a torsional torque of a predetermined magnitude to the outer gear 10 through the external meshing teeth 11 .

[0062] Specifically, applying a torsional moment of a predetermined magnitude to the outer sleeve gear 10 through the external meshing teeth 11 includes: meshing a rotating rod 84 having an internal meshing gear 81 with the outer sleeve gear 10; wherein a support rod is radially arranged on the outer periphery of the rotating rod 84, and a counterweight is installed at the free end of the support rod; meshing a slidable outer gear rod 86 having an external meshing gear 82 with the rotating shaft 20; installing a counterweight of a predetermined weight at the free end of the support rod, and making the support rod form a predetermined angle with the horizontal plane, so as to apply a torsional moment of a predetermined magnitude to the outer sleeve gear 10 through the counterweight.

[0063] More specifically, during the torque application process, Fig. 9 The torque applying device 80 shown includes a base plate 85 on which three brackets are arranged, two of which are brackets for mounting the rotating rod 84 , and the other bracket is a bracket for mounting the slidable external gear rod 86 .

[0064] The rotating rod 84 and the slidable external gear rod 86 are located at the same height, and the internal meshing gear 81 of the rotating rod 84 and the external meshing gear 82 of the slidable external gear rod 86 are arranged oppositely. A support rod is arranged in the radial direction of the rotating rod 84 as a support rod, and a counterweight is installed at the free end of the support rod.

[0065] When checking the state of the eccentric roller, first place the bottom plate on a horizontal turntable to ensure that the bottom plate 85 is level with the turntable. Then, according to the needs, adjust the position relationship between the counterweight and the support rod in combination with the weight of the counterweight to obtain the required torque. The outer gear 10 of the accessory clutch to be checked is matched with the internal gear 81 of the torque applying device 80.

[0066] Lift the counterweight to make the support rod form a certain angle with the horizontal plane, generally 30 to 80 degrees with the horizontal plane. Hold the handle of the slidable external gear rod 86, push the slidable external gear rod 86 to the left along the right bracket guide groove, and fine-tune the angle of the support rod to make the external meshing gear 82 of the slidable external gear rod 86 match the internal meshing gear 21 on the accessory clutch shaft.

[0067] Check whether there is relative rotation between the inner and outer gears of the clutch at this time. If there is no relative rotation, the accessory clutch can be used for assembly (indicating qualified); if it does not meet the specified requirements, it is necessary to reassemble the overrunning clutch and continue measuring.

[0068] After the inspection is qualified, take out the shaft 20, eccentric roller assembly 40, stop ring, lock plate 50 and elastic retaining ring 60; put each component in the heating tank, use lubricating oil 4050 oil bath heating, temperature T: 80±10℃, insulation S: 10±1min. Then, install the stop ring in sequence, install the eccentric roller assembly 40 into the clutch outer gear 10; install the shaft 20, stop ring, lock plate 50; use a flat head screwdriver, copper rod, and hammer to tighten the lock plate 50; then install the elastic retaining ring and the second bearing 30.

[0069] Finally, if Fig.10 As shown, install the assembled clutch assembly on the measuring fixture and measure the end face runout of the two bearing outer rings. When the end face runout value is less than 0.02, the overrunning clutch is assembled.

Claims

1. A method for assembling an overrunning clutch, characterized in that: The overrunning clutch comprises a rotating shaft (20) and an outer gear (10), two front and rear bearings (30) are arranged between the two, a stop ring, an eccentric roller assembly (40), an elastic retaining ring (60) and a locking plate (50) are installed between the two bearings (30), one end of the rotating shaft (20) is provided with an internal meshing tooth (21), and the outer periphery of the outer gear (10) is provided with an external meshing tooth (11); The method comprises the following steps: heating the components of the overrunning clutch in an oil bath; Assembling the components heated in the oil bath to obtain a clutch assembly; Measuring the unbalance amount of the clutch assembly, and performing balancing and material removal at a material removal location (70) of the outer gear (10) according to the unbalance amount measurement result, until the unbalance amount measurement is completed; Applying a torsional torque to the clutch assembly that has completed the unbalance measurement, and when the outer gear (10) and the rotating shaft (20) are not rotating relative to each other, the overrunning clutch is assembled; Applying a torsional torque to the clutch assembly for measuring the imbalance comprises: The rotating shaft (20) is fixed, and a torsional moment of a predetermined magnitude is applied to the outer gear (10) via the outer meshing teeth (11); Applying a predetermined magnitude of torsional torque to the outer gear (10) through the external meshing teeth (11) comprises: A rotating rod (84) having an internal meshing gear (81) is meshedly connected with the outer gear (10); wherein a support rod is radially arranged on the outer periphery of the rotating rod (84), and a counterweight is installed at the free end of the support rod; Engaging and connecting a slidable external gear rod (86) having an external meshing gear (82) with the rotating shaft (20); A counterweight of a predetermined weight is installed at the free end of the support rod, and the support rod is made to form a predetermined angle with the horizontal plane, so that a torsional moment of a predetermined magnitude is applied to the outer sleeve gear (10) through the counterweight.

2. A method for assembling an overrunning clutch as claimed in claim 1, characterized in that: Measuring the unbalance of the clutch assembly includes: Installing the clutch assembly on a balancing machine and adjusting the clutch assembly to be level; The balancing machine is operated to measure the unbalance amount of the clutch assembly, and wax mud of corresponding weight is pasted on two correction surfaces of the clutch assembly according to the measurement result until the unbalance amount is less than the unbalance amount threshold value.

3. A method for assembling an overrunning clutch as claimed in claim 2, characterized in that: Before applying a torsional torque to the clutch assembly after measuring the unbalance, the method further comprises: A sliding needle is used at the installation position of the eccentric roller assembly (40) to slide in the opposite direction of the rotation direction of the outer sleeve gear (10) to detect the swing state of the eccentric roller assembly (40).

4. A method for assembling an overrunning clutch as claimed in claim 3, characterized in that: The components after the oil bath heating are assembled including: The bearing (30), the elastic retaining ring (60) and the locking plate (50) are sequentially installed between the outer gear (10) and the rotating shaft (20) to obtain a clutch assembly; wherein the eccentric roller assembly (40) is installed before the second bearing (30) is installed.

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