CN113217526A - Power transmission shaft and method for machining power transmission shaft - Google Patents
Power transmission shaft and method for machining power transmission shaft Download PDFInfo
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- CN113217526A CN113217526A CN202110060529.2A CN202110060529A CN113217526A CN 113217526 A CN113217526 A CN 113217526A CN 202110060529 A CN202110060529 A CN 202110060529A CN 113217526 A CN113217526 A CN 113217526A
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- seal ring
- ring groove
- power transmission
- transmission shaft
- side surfaces
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000003754 machining Methods 0.000 title claims description 43
- 230000003746 surface roughness Effects 0.000 claims abstract description 28
- 239000010720 hydraulic oil Substances 0.000 claims description 22
- 238000010438 heat treatment Methods 0.000 claims description 18
- 230000002093 peripheral effect Effects 0.000 claims description 14
- 239000003921 oil Substances 0.000 claims description 6
- 238000007789 sealing Methods 0.000 abstract description 4
- 230000009191 jumping Effects 0.000 abstract 1
- 238000005480 shot peening Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 7
- 238000005520 cutting process Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C3/00—Shafts; Axles; Cranks; Eccentrics
- F16C3/02—Shafts; Axles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/14—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass gear parts, e.g. gear wheels
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Ocean & Marine Engineering (AREA)
- Sealing Devices (AREA)
- Turning (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
The invention provides a power transmission shaft and a method for processing the power transmission shaft, which can restrain the influence of the processing of a sealing ring groove on the jumping tolerance of the power transmission shaft. The power transmission shaft (1) is provided with: a seal ring groove (20) formed in an annular shape having a rectangular cross-sectional shape on the outer periphery thereof and into which the seal ring (2) is inserted, and an annular flow path (16) arranged adjacent to the seal ring groove (20), wherein the seal ring groove (20) has: the surface roughness of a bottom surface (21) formed on the innermost circumference of the rectangular cross-sectional shape and a pair of side surfaces (22, 23) formed on both ends in the axial direction of the rectangular cross-sectional shape, wherein the side surface (22) on the side opposite to the axial direction of the annular flow passage (16) among the pair of side surfaces (22, 23) is smaller than that of the bottom surface (21).
Description
Technical Field
The present invention relates to a power transmission shaft and a method of machining the power transmission shaft.
Background
Documents of the prior art
Patent document
Patent document 1: japanese unexamined patent publication No. 2017-180757
Disclosure of Invention
Technical problem to be solved by the invention
However, when the seal ring groove is formed in the power transmission shaft, the power transmission shaft may be subjected to a heat treatment step and a residual stress application step by shot peening or the like, and then subjected to finish machining. In this case, since the hardened portion to which the surface residual stress is applied by the residual stress applying step such as shot peening is subjected to cutting, the surface residual stress of the seal ring groove is released, and the power transmission shaft is deformed. Therefore, the run-out tolerance of the power transmission shaft may be affected due to the finishing of the seal ring groove.
The present invention has been made in view of the above problems, and an object thereof is to suppress an influence of machining of a seal ring groove on a runout tolerance of a power transmission shaft.
Technical solution for solving technical problem
According to one aspect of the present invention, a power transmission shaft includes: a seal ring groove formed in an annular shape having a rectangular cross-sectional shape on an outer periphery thereof and into which a seal ring is inserted, and a hydraulic oil passage arranged adjacent to the seal ring groove, the seal ring groove including: a bottom surface formed on an innermost circumference of the rectangular cross-sectional shape, and a pair of side surfaces formed at both end portions in an axial direction of the rectangular cross-sectional shape, wherein a side surface on a side opposite to the axial direction of the hydraulic oil passage among the pair of side surfaces has a surface roughness smaller than that of the bottom surface.
Further, according to an aspect of the present invention, a method of machining a power transmission shaft having an annular seal ring groove having a rectangular cross-sectional shape on an outer periphery thereof and into which a seal ring is inserted, and a working oil passage disposed adjacent to the seal ring groove, includes: a rough machining step of machining the seal ring groove; a heat treatment step of performing heat treatment after the seal ring groove is machined; a residual stress applying step of applying a residual stress to the outer peripheral surface; and a finishing step of, after the residual stress applying step is performed, finishing at least a side surface on a side opposite to the axial direction of the hydraulic oil passage out of a pair of side surfaces formed at both end portions in the axial direction of the rectangular cross-sectional shape of the seal ring groove, and not processing a bottom surface formed at an innermost circumference of the rectangular cross-sectional shape.
ADVANTAGEOUS EFFECTS OF INVENTION
In the above aspect, the surface roughness of the side surface of the seal ring groove is smaller than the surface roughness of the bottom surface. Therefore, even when the finish machining of the seal ring groove is performed after the heat treatment step and the residual stress application step are performed, only the side surface of the seal ring groove can be machined. That is, the bottom surface does not need to be machined during finishing. Therefore, the surface residual stress of the bottom surface is not released, but only the surface residual stress of the side surface is released, so that the influence of the released surface residual stress can be reduced as compared with the case of finishing to the bottom surface. Therefore, the influence of the play tolerance of the power transmission shaft due to the machining of the seal ring groove can be suppressed while suppressing the deformation of the power transmission shaft.
Drawings
Fig. 1 is a front view of a power transmission shaft according to an embodiment of the present invention.
Fig. 2 is a cross-sectional enlarged view illustrating a structure in the vicinity of the seal ring groove of the power transmission shaft.
Fig. 3 is a flowchart of a method of machining the power transmission shaft.
Fig. 4 is a diagram for explaining rough machining of the seal ring groove of the power transmission shaft.
Fig. 5 is a diagram illustrating heat treatment of the power transmission shaft.
Fig. 6 is a diagram for explaining shot peening of the power transmission shaft.
Fig. 7 is a view for explaining finishing of one side surface of the seal ring groove of the power transmission shaft.
Fig. 8 is a view for explaining finishing of the other side surface of the seal ring groove of the power transmission shaft.
Detailed Description
Next, a power transmission shaft 1 according to an embodiment of the present invention will be described with reference to the drawings. Here, a case where the power transmission shaft 1 is applied to an input shaft of a stepped automatic transmission (step AT) of a vehicle will be described as an example.
First, the structure of the power transmission shaft 1 will be described with reference to fig. 1 and 2.
Fig. 1 is a front view of a power transmission shaft 1. Fig. 2 is a cross-sectional enlarged view of a portion II of fig. 1 in a state of being assembled in a stepped automatic transmission (step AT) of a vehicle, and is a diagram illustrating a structure in the vicinity of a seal ring groove 20 of a power transmission shaft 1.
As shown in fig. 1, the power transmission shaft 1 includes: a first spline 11, a sun gear 12, a second spline 13, a plurality of ribs 14, and a plurality of seal ring grooves 20. The power transmission shaft 1 rotates around the central axis e, and transmits the input power to the output side. The power transmission shaft 1 is formed of carbon steel (e.g., SCR 420H).
The first spline 11 is engaged with a turbine (not shown) of the torque converter. Power from the torque converter is input from the first spline 11.
The sun gear 12 constitutes a planetary gear mechanism (not shown). Power is output from the sun gear 12.
The second spline 13 is engaged with a clutch mechanism (not shown) for switching the planetary gear mechanism.
An annular flow passage 16 (see fig. 2) as a hydraulic oil passage through which hydraulic oil for controlling the clutch mechanism passes is formed between the pair of adjacent rib bodies 14. The number of the ribs 14 is plural (four in this case) in accordance with the number of the annular flow paths 16 to be formed.
As shown in fig. 2, the power transmission shaft 1 includes: a hydraulic oil flow passage 1a formed in the direction of the central axis e, and a hydraulic oil flow passage 1b formed in the radial direction from the hydraulic oil flow passage 1a and opening on the outer peripheral surface. The outer peripheral surface of the power transmission shaft 1 faces the inner peripheral surface of the cylindrical sleeve 3.
The sleeve 3 has a hydraulic oil flow passage 3a formed in the radial direction and opening at the inner peripheral surface.
The annular flow passage 16 is defined by the outer peripheral surface of the power transmission shaft 1, a seal ring 2 described later inserted into a seal ring groove 20 of the rib 14, and the inner peripheral surface of the sleeve 3.
The hydraulic oil for controlling the clutch mechanism flows into the annular flow passage 16 through the hydraulic oil flow passages 1a and 1b, and is supplied from the annular flow passage 16 to the clutch mechanism through the hydraulic oil flow passage 3 a.
As shown in fig. 2, the seal ring groove 20 is formed in a concave shape from the outer periphery of each rib 14 toward the center axis e side. The seal ring groove 20 is formed substantially at the center in the axial direction of the rib body 14. The seal ring groove 20 is formed in a ring shape having a rectangular sectional shape. Seal rings 2 having a rectangular sectional shape are inserted into the seal ring grooves 20, respectively.
The seal ring groove 20 has: a bottom surface 21, a pair of side surfaces 22, 23, and a pair of step portions 24.
The bottom surface 21 is formed at the innermost periphery of the rectangular sectional shape. The seal ring 2 does not abut against the bottom surface 21. Therefore, the surface roughness of the bottom surface 21 may be relatively large. The bottom surface 21 is formed by a rough machining process, as will be described later.
The pair of side surfaces 22 and 23 are formed at both axial ends of the rectangular cross-sectional shape. Specifically, the side surface 22 is formed on the opposite side of the annular flow passage 16, and the side surface 23 is formed on the annular flow passage 16 side. When the hydraulic oil is supplied to the annular flow passage 16, the seal ring 2 inserted into the seal ring groove 20 abuts against the side surface 22 on the opposite side to the annular flow passage 16. On the other hand, when the hydraulic oil is not supplied to the annular flow passage 16, the seal ring 2 inserted into the seal ring groove 20 abuts against the side surface 22 opposite to the annular flow passage 16 or the side surface 23 on the annular flow passage 16 side. Therefore, the surface roughness of the side surfaces 22 and 23 is set to be smaller than that of the bottom surface 21.
Of the side surfaces 22 and 23, only the side surface 22 on the opposite side of the annular flow passage 16 is in contact with the seal ring 2 in the pressurized state, and the seal ring 2 does not contact the side surface 23 on the annular flow passage 16 in the pressurized state. Therefore, only the surface roughness of the side surface 22 that abuts against the seal ring 2 in a state where pressure is applied may be set smaller than the surface roughness of the bottom surface 21 and the side surface 23.
That is, when the hydraulic oil is supplied to the annular flow passage 16, the side surface of the seal ring 2 is pressed against the side surface 22 of the seal ring groove 20 on the side opposite to the annular flow passage 16 by the pressure of the hydraulic oil in a pressurized state. Similarly, when the hydraulic oil is supplied to the annular flow passage 16, the outer peripheral surface of the seal ring 2 is pressed against the inner peripheral surface of the sleeve 3 by the pressure of the hydraulic oil in a pressurized state. Thereby, the annular flow passage 16 is sealed.
On the other hand, when the hydraulic oil is not supplied to the annular flow passage 16, the seal ring 2 abuts against either one of the side surfaces 22 and 23 in a state where no pressure or load is applied. Therefore, by making both the side surfaces 22 and 23 have a smaller surface roughness than the bottom surface 21, the seal ring 2 does not come into contact with a surface having a large surface roughness, and therefore the durability of the seal ring 2 can be maintained.
As described later, the side surfaces 22 and 23 are formed by a rough machining step, a heat treatment step, a shot blasting step which is a residual stress applying step, and a finish machining step.
Thus, when the seal ring groove 20 is finished after the heat treatment and the shot peening, only the side surfaces 22 and 23 of the seal ring groove 20 can be machined. That is, the bottom surface 21 does not need to be machined during finishing. Therefore, the surface residual stress of the bottom surface 21 is not released, but only the surface residual stresses of the side surfaces 22 and 23 are released, so that the influence of the released surface residual stress can be reduced as compared with the case of finishing the bottom surface 21. Therefore, the influence of the play tolerance of the power transmission shaft 1 due to the machining of the seal ring groove 20 can be suppressed while suppressing the deformation of the power transmission shaft 1.
In particular, when only the side surface 22 of the seal ring groove 20 on the side opposite to the annular flow passage 16 is processed after the heat treatment and shot peening and the finish processing of the seal ring groove 20, the influence of the released surface residual stress can be further reduced. Therefore, the influence of the play tolerance of the power transmission shaft 1 due to the machining of the seal ring groove 20 can be further suppressed while suppressing the deformation of the power transmission shaft 1. In addition, by processing only the side surface 22 with which the seal ring 2 is in contact in a state where pressure is applied, and by reducing the surface roughness as compared with the other side surfaces 23 and the bottom surface 21, it is possible to minimize the reduction in durability of the seal ring 2.
A step 24 is formed between the bottom surface 21 and the side surfaces 22 and 23. That is, the distance between the pair of side surfaces 22 and 23 is larger than the bottom surface 21.
The step portions 24 are formed between the side surface 22 and the bottom surface 21, and between the side surface 23 and the bottom surface 21. The connecting surface 25 between the side surfaces 22 and 23 and the bottom surface 21 is formed in a curved surface shape continuous with the side surfaces 22 and 23. Similarly, the connecting surface 26 between the bottom surface 21 and the stepped portion 24 is formed into a curved surface shape continuous with the bottom surface 21.
Accordingly, since the connecting surface 25 between the side surfaces 22 and 23 and the stepped portion 24 is formed in a curved surface shape, stress concentration can be avoided as compared with a case where the side surfaces 22 and 23 and the stepped portion 24 are connected by a right-angled corner portion. Similarly, since the connecting surface 26 between the bottom surface 21 and the stepped portion 24 is formed in a curved surface shape, stress concentration can be avoided as compared with a case where the bottom surface 21 and the stepped portion 24 are connected by a right-angled corner portion.
Next, a method of machining the seal ring groove 20 of the power transmission shaft 1 will be described with reference to fig. 3 to 8.
Fig. 3 is a flowchart of a method of machining the power transmission shaft 1. Fig. 4 is a view for explaining rough machining of the seal ring groove 20 of the power transmission shaft 1. Fig. 5 is a diagram illustrating heat treatment of the power transmission shaft 1. Fig. 6 is a diagram illustrating shot peening of the power transmission shaft 1. Fig. 7 is a view for explaining the finish machining of one side surface 22 of the seal ring groove 20 of the power transmission shaft 1. Fig. 8 is a view for explaining the finish machining of the other side surface 23 of the seal ring groove 20 of the power transmission shaft 1.
In step S1 of fig. 3, the seal ring groove 20 is roughly machined (rough machining step). Specifically, as shown in fig. 4, the power transmission shaft 1 is set in a lathe, and the seal ring groove 20 is cut from the outer periphery toward the center axis e side by a superhard tool 51 having a size in the axial direction of the power transmission shaft 1 substantially equal to the bottom surface 21 of the seal ring groove 20.
At this time, the cemented carbide 51 having curved end corners at the distal end of the cemented carbide 51 is used, and only the cutting work is performed by the cemented carbide 51, whereby the curved connection surface 26 connecting the bottom surface 21 and the step portion 24 is formed.
Next, in step S2 of fig. 3, the power transmission shaft 1 is heat-treated (heat treatment step). Specifically, as shown in fig. 5, heat is applied to the outer peripheral surface of the power transmission shaft 1 to increase the hardness thereof. In this case, the temperature and time of the applied heat are set according to the required hardness. The depth of the hardened portion 27 by heat treatment of the bottom surface 21 located inside the seal ring groove 20 is greater than the outer peripheral surface of the rib 14 and the side surfaces 22, 23 of the seal ring groove 20.
Next, in step S3 of fig. 3, the power transmission shaft 1 is subjected to shot peening (shot peening step). Specifically, as shown in fig. 6, the shot material 52 of granular steel is caused to collide with the outer peripheral surface of the power transmission shaft 1, so that work hardening is caused by plastic deformation, and surface residual stress is applied.
Next, in step S4 of fig. 3, the seal ring groove 20 is finished (finishing step). Specifically, as shown in fig. 7 and 8, the power transmission shaft 1 is set on a lathe, and only the side surfaces 22 and 23 of the seal ring groove 20 are subjected to cutting (hard cutting) from the outer periphery toward the center axis e side by the CBN tool 53 having a smaller axial dimension of the power transmission shaft 1 than the bottom surface 21 of the seal ring groove 20. That is, in the finishing step, the bottom surface 21 of the seal ring groove 20 is not cut. At this time, the side faces 22 and 23 are cut so that the surface roughness is smaller than that in the rough machining in step S1.
First, as shown in fig. 7, one side surface 22 of the seal ring groove 20 is cut. Thereby, a step portion 24 is formed between the side surface 22 and the bottom surface 21. Next, as shown in fig. 8, the other side surface 23 of the seal ring groove 20 is cut. Thereby, a step portion 24 is formed between the side surface 23 and the bottom surface 21.
At this time, by using the CBN tool 53 having the curved both end corners of the distal end of the CBN tool 53, only the cutting process is performed by the CBN tool 53, thereby forming the curved connecting surface 25 connecting the side surfaces 22 and 23 and the stepped portion 24.
Through the above steps, the seal ring groove 20 can be formed.
In this way, when the finish machining of the seal ring groove 20 is performed after the heat treatment and the shot peening, only the side surfaces 22 and 23 of the seal ring groove 20 are machined. That is, in the finishing step, the bottom surface 21 of the seal ring groove 20 is not cut. Therefore, the surface residual stress of the bottom surface 21 is not released, but only the surface residual stresses of the side surfaces 22 and 23 are released, so that the influence of the released surface residual stress can be reduced as compared with the case of finishing to the bottom surface 21. Therefore, the influence of the play tolerance of the power transmission shaft 1 due to the machining of the seal ring groove 20 can be suppressed while suppressing the deformation of the power transmission shaft 1.
Further, the side surface 22 with which the seal ring 2 is in contact in a state where pressure is applied and the side surface 23 with which the seal ring 2 is likely to be in contact in a state where no pressure is applied are cut so that the surface roughness is smaller than that of the bottom surface 21, whereby the durability of the seal ring 2 can be suppressed from being lowered.
According to the above embodiment, the following effects are obtained.
The power transmission shaft 1 includes: a seal ring groove 20 formed in an annular shape having a rectangular cross-sectional shape on the outer periphery and into which the seal ring 2 is inserted, and an annular flow path 16 arranged adjacent to the seal ring groove 20, the seal ring groove 20 including: a bottom surface 21 formed on the innermost circumference of the rectangular cross-sectional shape, and a pair of side surfaces 22 and 23 formed at both ends in the axial direction of the rectangular cross-sectional shape, wherein the surface roughness of the side surface 22 on the opposite side to the axial direction of the annular flow passage 16 among the pair of side surfaces 22 and 23 is smaller than that of the bottom surface 21.
According to this structure, the surface roughness of the side surface 22 of the seal ring groove 20 is smaller than the surface roughness of the bottom surface 21. Therefore, even when the finish machining of the seal ring groove 20 is performed after the heat treatment and the shot peening, only the side surface 22 of the seal ring groove 20 may be machined. That is, the bottom surface 21 does not need to be machined during finishing. Therefore, the surface residual stress of the bottom surface 21 is not released, but only the surface residual stress of the side surface 22 is released, so that the influence of the released surface residual stress can be reduced as compared with the case of finishing to the bottom surface 21. Therefore, the influence of the run-out tolerance of the power transmission shaft 1 due to the machining of the seal ring groove 20 can be suppressed while suppressing the deformation of the power transmission shaft 1 (corresponding to the effect of claim 1).
When the hydraulic oil is supplied to the annular flow passage 16, the hydraulic pressure is applied to the seal ring 2, and the seal ring 2 abuts against the side surface 22. At this time, since the surface roughness of the side surface 22 of the seal ring groove 20 on the side opposite to the annular flow path 16 is small, the durability of the seal ring 2 can be suppressed from being lowered (corresponding to the effect of claim 1).
The surface roughness of the side surface 23 on the side of the annular channel 16 out of the pair of side surfaces 22 and 23 is also smaller than that of the bottom surface 21.
In this structure, both the side surfaces 22 and 23 have a smaller surface roughness than the bottom surface 21. When the hydraulic oil is not supplied to the annular flow passage 16, the seal ring 2 abuts against any one of the side surfaces 22 and 23 in a state where no pressure or load is applied. Therefore, by making the surface roughness of both the side surfaces 22 and 23 smaller than the bottom surface 21, the seal ring 2 does not come into contact with the surface having the larger surface roughness, so that the durability of the seal ring 2 can be maintained (corresponding to the effect of claim 2).
Further, the distance between the pair of side surfaces 22 and 23 is larger than the bottom surface 21, and a step portion 24 is formed between the side surfaces 22 and 23 having a smaller surface roughness than the bottom surface 21 and the bottom surface 21, and a connecting surface 25 between the side surfaces 22 and 23 and the step portion 24 is formed in a curved surface shape continuous with the side surfaces 22 and 23.
According to this configuration, since the connecting surface 25 between the side surfaces 22 and 23 and the stepped portion 24 is formed in a curved surface shape, stress concentration can be avoided as compared with a case where the side surfaces 22 and 23 and the stepped portion 24 are connected by a right-angled corner portion (corresponding to the effect of claim 3).
The method of machining the power transmission shaft 1 having the annular seal ring groove 20 having a rectangular cross-sectional shape on the outer periphery and into which the seal ring 2 is inserted, and the annular flow path 16 disposed adjacent to the seal ring groove 20 includes: a rough machining step of machining the seal ring groove 20; a heat treatment step of performing heat treatment after the seal ring groove 20 is processed; a residual stress applying step of continuously applying a residual stress to the outer peripheral surface; and a finishing step of, after the residual stress applying step, finishing at least a side surface 22 on the opposite side to the axial direction of the annular flow passage 16 among a pair of side surfaces 22 and 23 formed at both end portions in the axial direction of the rectangular cross-sectional shape of the seal ring groove 20, and not processing the bottom surface 21 formed at the innermost circumference of the rectangular cross-sectional shape.
In the rough machining step, the seal ring groove 20 is cut by the cemented carbide tool 51, and in the finish machining step, the side surfaces 22 and 23 of the seal ring groove 20 are cut by the CBN tool 53 so that the surface roughness is smaller than in the rough machining step.
According to the above configuration, when the finish machining of the seal ring groove 20 is performed after the heat treatment and the shot peening, only the side surfaces 22 and 23 of the seal ring groove 20 are machined. That is, in the finishing step, the bottom surface 21 of the seal ring groove 20 is not cut. Therefore, the surface residual stress of the bottom surface 21 is not released, but only the surface residual stresses of the side surfaces 22 and 23 are released, so that the influence of the released surface residual stress can be reduced as compared with the case of finishing to the bottom surface 21. Therefore, the influence of the run-out tolerance of the power transmission shaft 1 due to the machining of the seal ring groove 20 can be suppressed while suppressing the deformation of the power transmission shaft 1 (corresponding to the effects of claims 4 and 5).
Further, by performing cutting processing on the side surface 22 with which the seal ring 2 is in contact in a state where pressure is applied, and making the surface roughness smaller than the bottom surface 21, it is also possible to suppress a decrease in durability of the seal ring 2.
While the embodiments of the present invention have been described above, the above embodiments are merely examples of applications of the present invention, and the technical scope of the present invention is not intended to be limited to the specific configurations of the above embodiments.
For example, in the above-described embodiment, a case where the power transmission shaft 1 is applied to an input shaft of a step-variable automatic transmission (step AT) of a vehicle is described as an example. Instead, the sealing ring groove 20 can be used in other power transmission shafts.
Description of the reference numerals
1a power transmission shaft; 2, sealing a ring; 16 annular flow passages (working oil passages); 20, sealing the ring groove; 21 a bottom surface; 22 side surface; 23 side surface; 24 step parts; 25 connecting surface; 26 connect the faces.
Claims (5)
1. A power transmission shaft characterized by comprising:
a seal ring groove formed in a ring shape having a rectangular cross-sectional shape on an outer periphery thereof, into which a seal ring is inserted;
a working oil passage disposed adjacent to the seal ring groove;
the seal ring groove has:
a bottom surface formed on the innermost circumference of the rectangular cross-sectional shape;
a pair of side surfaces formed at both axial ends of the rectangular cross-sectional shape;
the surface roughness of the side surface on the side opposite to the working oil passage in the axial direction, among the pair of side surfaces, is smaller than that of the bottom surface.
2. The power transmission shaft according to claim 1,
the surface roughness of the side surface on the working oil path side out of the pair of side surfaces is also smaller than that of the bottom surface.
3. The power transmission shaft according to claim 1 or 2,
the interval between the pair of side surfaces is larger than that of the bottom surface, a step part is formed between the side surface and the bottom surface, the surface roughness of which is smaller than that of the bottom surface,
the connecting surface between the side surface and the stepped portion is formed in a curved surface shape continuous with the side surface.
4. A method of machining a power transmission shaft, the power transmission shaft comprising: the method for machining a power transmission shaft, which has an annular seal ring groove having a rectangular cross-sectional shape on an outer periphery thereof and into which a seal ring is inserted, and a working oil passage arranged adjacent to the seal ring groove, is characterized by comprising:
a rough machining step of machining the seal ring groove;
a heat treatment step of performing heat treatment after the seal ring groove is processed;
a residual stress applying step of applying a residual stress to the outer peripheral surface;
and a finishing step of, after the residual stress applying step is performed, finishing at least a side surface on a side opposite to the axial direction of the hydraulic oil passage out of a pair of side surfaces formed at both end portions in the axial direction of the rectangular cross-sectional shape of the seal ring groove, and not processing a bottom surface formed at an innermost circumference of the rectangular cross-sectional shape.
5. The method of processing a power transmission shaft according to claim 4,
in the rough machining step, the seal ring groove is cut with a cemented carbide tool, and in the finish machining step, the side surface of the seal ring groove is cut with a CBN tool so that the surface roughness is smaller than in the rough machining step.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020015996A JP7412196B2 (en) | 2020-02-03 | 2020-02-03 | Power transmission shaft and power transmission shaft processing method |
| JP2020-015996 | 2020-02-03 |
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| CN113217526A true CN113217526A (en) | 2021-08-06 |
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| CN202110060529.2A Pending CN113217526A (en) | 2020-02-03 | 2021-01-18 | Power transmission shaft and method for machining power transmission shaft |
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| CN (1) | CN113217526A (en) |
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| JP2018159386A (en) * | 2017-03-21 | 2018-10-11 | Nok株式会社 | Sealing device |
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- 2020-02-03 JP JP2020015996A patent/JP7412196B2/en active Active
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| JPH10169782A (en) * | 1996-12-12 | 1998-06-26 | Ntn Corp | Rotary seal ring and fluid seal device |
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| JP7412196B2 (en) | 2024-01-12 |
| JP2021124131A (en) | 2021-08-30 |
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