CA2207234A1 - Multi-piece eccentric shaft and method of manufacturing same - Google Patents
Multi-piece eccentric shaft and method of manufacturing sameInfo
- Publication number
- CA2207234A1 CA2207234A1 CA 2207234 CA2207234A CA2207234A1 CA 2207234 A1 CA2207234 A1 CA 2207234A1 CA 2207234 CA2207234 CA 2207234 CA 2207234 A CA2207234 A CA 2207234A CA 2207234 A1 CA2207234 A1 CA 2207234A1
- Authority
- CA
- Canada
- Prior art keywords
- pin
- hole
- eccentric shaft
- main body
- axis
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- 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
- F16C3/04—Crankshafts, eccentric-shafts; Cranks, eccentrics
- F16C3/18—Eccentric-shafts
-
- 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
- B23P11/00—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for
-
- 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
-
- 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
- B23P2700/00—Indexing scheme relating to the articles being treated, e.g. manufactured, repaired, assembled, connected or other operations covered in the subgroups
- B23P2700/02—Camshafts
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Ocean & Marine Engineering (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
- Braking Arrangements (AREA)
Abstract
A multi-piece eccentric shaft, particularly for use in a vehicle anti-lock braking system, has a cylindrical main body with a cylindrical hole drilled in one end thereof, the axis of the hole being offset from the axis of the main body. A cylindrical pin is secured in the hole, preferably by a press fit, the inserted portion of the pin preferably being knurled. The pin may itself have a cylindrical hole drilled in the free end thereof, and a second cylindrical pin may be inserted therein, typically but not necessarily with its axis aligned with the axis of the main body.
Description
This invention relates to the design, manufacture and assembly of eccentric shafts, particularly but not necessarily exclusively those intended for use in vehicle anti-lock braking systems.
An eccentric shaft of the type in question has a cylindrical main body 5 portion of one diameter, with a cylindrical eccentric pin portion of smaller diameter extending from one end of the main body portion, with its axis offset from the axis of the main body portion. There may also be a second cylindrical pin portion of still smaller diameter, extending from the end of the first pin portion, typically but not necessary with its axis co-axial with the axis of the main body portion.
Eccentric shafts presently are manufactured in one piece. The eccentric portion is produced by eccentric grinding, i.e. by mounting the shaft in an eccentric chuck, and then grinding away metal to leave the eccentric portion(s).There are various disadvantages associated with manufacturing eccentric shafts in this fashion, including relatively high machining costs in comparison to the present invention, primarily due to the expense of eccentric grinding. The present invention may also provide better quality parts, primarily due to there being less deformation during heat treating.
It is an object of the present invention to provide an improved eccentric shaft and an improved method of manufacturing same. In particular, it is an object to avoid eccentric grinding.
In the invention, the end of a cylindrical main body is bored to accept a cylindrical pin. The free end of the pin may in turn be bored to accept a second pin.
The pins are securely press-fitted into the bored holes. If desired, the pins may be knurled, such that the knurling is deformed on press-fitting of the pins, to provide a possibly more secure fit.
Further features of the invention will be described or will become apparent in the course of the following detailed description.
The invention will now be described in detail, with reference to the accompanying drawings of the preferred embodiments, by way of example, in which:Fig. 1A is a side view of a first embodiment of the multi-piece eccentric shaft;
Fig. 1 B is an end view of the shaft of Fig. 1A;
Fig. 1C is a side view of the pin of Fig. 1A;
Fig. 2A is a side view of a second embodiment;
Fig. 2B is an end view of the shaft of Fig. 2A;
Fig. 2C is a side view of the pin of Fig. 2A;
Fig. 3A is a side view of a third embodiment, having two pins;
Fig. 3B is an end view of the shaft of Fig. 3A;
Fig. 3C is a side view of the primary and secondary pins of Fig. 3A;
Fig. 4A is a side view of a fourth embodiment;
Fig. 4B is an end view of the shaft of Fig. 4A; and, Fig. 4C is a side view of the primary and secondary pins of Fig. 4A.
The drawings show four related embodiments, as typical examples of the invention. Figs. 1A through 1C show a first embodiment of the multi-piece eccentric shaft 20, having a cylindrical main body 22, typically but not necessarily with chamfers or radii 24 at the ends thereof to facilitate subsequent installation of the shaft in an anti-lock braking system. A hole 26 is drilled into one end of the shaft, with its axis offset from the axis of the main body. A cylindrical pin 30 is press-fitted into the hole 26.
Figs. 2A through 2C show a second embodiment, in which the pin 30 has knurling 32 which provides possibly a more secure assembly of the pin to themain body.
Figs. 3A through 3C show a third embodiment, in which the pin 30 has a hole 34 drilled into the free end thereof, with its axis typically but not necessarily aligned with the axis of the main body. A second pin 40 is press-fitted into the hole 34. This embodiment may be referred to as a "step-pin" eccentric shaft.
Figs. 4A through 4C show a fourth embodiment of the invention, which is a three-piece version as in the embodiment of Figs. 3A through 3C, with the pins 30 and 40 having knurling 32 as in the embodiment of Figs. 2A to 2C.
The shafts may be manufactured and assembled by any conventional sequence of steps, but preferably these steps are as follows:
a. Turning of the main body and pins to produce the chamfers or radii 24.
b. Drilling and reaming the holes 26 (and 34 if applicable).
c. Heat treating the parts.
d. Grinding the parts to their final diameters.
e. Assembling the parts, i.e. inserting the pins into the holes.
Despite the number of manufacturing steps involved, this configuration and method of manufacture should result in cost savings, due to the avoidance of5 eccentric grinding. Better quality parts may also be possible, since the heat treating takes place before final assembly, thus avoiding the possibility of the pins deforming relative to the shaft, as is a tendency in the present one-piece shafts.
An eccentric shaft of the type in question has a cylindrical main body 5 portion of one diameter, with a cylindrical eccentric pin portion of smaller diameter extending from one end of the main body portion, with its axis offset from the axis of the main body portion. There may also be a second cylindrical pin portion of still smaller diameter, extending from the end of the first pin portion, typically but not necessary with its axis co-axial with the axis of the main body portion.
Eccentric shafts presently are manufactured in one piece. The eccentric portion is produced by eccentric grinding, i.e. by mounting the shaft in an eccentric chuck, and then grinding away metal to leave the eccentric portion(s).There are various disadvantages associated with manufacturing eccentric shafts in this fashion, including relatively high machining costs in comparison to the present invention, primarily due to the expense of eccentric grinding. The present invention may also provide better quality parts, primarily due to there being less deformation during heat treating.
It is an object of the present invention to provide an improved eccentric shaft and an improved method of manufacturing same. In particular, it is an object to avoid eccentric grinding.
In the invention, the end of a cylindrical main body is bored to accept a cylindrical pin. The free end of the pin may in turn be bored to accept a second pin.
The pins are securely press-fitted into the bored holes. If desired, the pins may be knurled, such that the knurling is deformed on press-fitting of the pins, to provide a possibly more secure fit.
Further features of the invention will be described or will become apparent in the course of the following detailed description.
The invention will now be described in detail, with reference to the accompanying drawings of the preferred embodiments, by way of example, in which:Fig. 1A is a side view of a first embodiment of the multi-piece eccentric shaft;
Fig. 1 B is an end view of the shaft of Fig. 1A;
Fig. 1C is a side view of the pin of Fig. 1A;
Fig. 2A is a side view of a second embodiment;
Fig. 2B is an end view of the shaft of Fig. 2A;
Fig. 2C is a side view of the pin of Fig. 2A;
Fig. 3A is a side view of a third embodiment, having two pins;
Fig. 3B is an end view of the shaft of Fig. 3A;
Fig. 3C is a side view of the primary and secondary pins of Fig. 3A;
Fig. 4A is a side view of a fourth embodiment;
Fig. 4B is an end view of the shaft of Fig. 4A; and, Fig. 4C is a side view of the primary and secondary pins of Fig. 4A.
The drawings show four related embodiments, as typical examples of the invention. Figs. 1A through 1C show a first embodiment of the multi-piece eccentric shaft 20, having a cylindrical main body 22, typically but not necessarily with chamfers or radii 24 at the ends thereof to facilitate subsequent installation of the shaft in an anti-lock braking system. A hole 26 is drilled into one end of the shaft, with its axis offset from the axis of the main body. A cylindrical pin 30 is press-fitted into the hole 26.
Figs. 2A through 2C show a second embodiment, in which the pin 30 has knurling 32 which provides possibly a more secure assembly of the pin to themain body.
Figs. 3A through 3C show a third embodiment, in which the pin 30 has a hole 34 drilled into the free end thereof, with its axis typically but not necessarily aligned with the axis of the main body. A second pin 40 is press-fitted into the hole 34. This embodiment may be referred to as a "step-pin" eccentric shaft.
Figs. 4A through 4C show a fourth embodiment of the invention, which is a three-piece version as in the embodiment of Figs. 3A through 3C, with the pins 30 and 40 having knurling 32 as in the embodiment of Figs. 2A to 2C.
The shafts may be manufactured and assembled by any conventional sequence of steps, but preferably these steps are as follows:
a. Turning of the main body and pins to produce the chamfers or radii 24.
b. Drilling and reaming the holes 26 (and 34 if applicable).
c. Heat treating the parts.
d. Grinding the parts to their final diameters.
e. Assembling the parts, i.e. inserting the pins into the holes.
Despite the number of manufacturing steps involved, this configuration and method of manufacture should result in cost savings, due to the avoidance of5 eccentric grinding. Better quality parts may also be possible, since the heat treating takes place before final assembly, thus avoiding the possibility of the pins deforming relative to the shaft, as is a tendency in the present one-piece shafts.
Claims (9)
1. A multi-piece eccentric shaft comprising an elongated cylindrical main body having a cylindrical blind hole in one end thereof, and a cylindrical pin secured in said hole, projecting outwardly therefrom, the axis of said hole being parallel to and offset from the axis of said main body.
2. A multi-piece eccentric shaft as recited in claim 1, where said pin is secured in said hole by a press fit.
3. A multi-piece eccentric shaft as recited in claim 2, where the portion of said pin within said hole is knurled.
4. A multi-piece eccentric shaft as recited in claim 1, where said pin has a cylindrical blind hole in the free end thereof, and further comprising a second pin secured in said hole, projecting outwardly therefrom.
5. A multi-piece eccentric shaft as recited in claim 4, where the axis ofsaid hole in said pin is parallel to and aligned with the axis of said main body.
6. A multi-piece eccentric shaft as recited in claim 4, where said secondpin is secured in said hole in said first pin by a press fit.
7. A multi-piece eccentric shaft as recited in claim 5, where the portion of said second pin within said hole in said first pin is knurled.
8. A method of manufacturing an eccentric shaft, comprising the steps of:drilling a cylindrical hole in one end of a cylindrical main body, with the axis of the hole offset from the axis of the main body;
securing a cylindrical pin in said hole, to project therefrom.
securing a cylindrical pin in said hole, to project therefrom.
9. A method as recited in claim 8, further comprising the step of heat treating said main body with said hole drilled therein, and said pin, prior to securing said pin in said hole.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US1932696P | 1996-06-10 | 1996-06-10 | |
| US60/019,326 | 1996-06-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2207234A1 true CA2207234A1 (en) | 1997-12-10 |
Family
ID=21792620
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2207234 Abandoned CA2207234A1 (en) | 1996-06-10 | 1997-06-09 | Multi-piece eccentric shaft and method of manufacturing same |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA2207234A1 (en) |
| DE (1) | DE19724281A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102886650A (en) * | 2012-10-11 | 2013-01-23 | 常熟天地煤机装备有限公司 | Gear shaft shoulder fillet machining process |
| CN104942549A (en) * | 2015-07-21 | 2015-09-30 | 巨轮股份有限公司 | Manufacture process of robot RV reducer spline eccentric shaft |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19837382A1 (en) * | 1998-08-18 | 2000-02-24 | Deutz Ag | Drive for auxiliary unit, especially hydraulic pump on internal combustion engine, includes belt drive wheel connected to splined shaft by pressed connection, with bore interacting with tooth points of splined shaft |
| DE102008027873B4 (en) | 2008-06-11 | 2010-05-12 | Heinz Wieland | Connection of two wooden beams |
| CN102312909A (en) * | 2011-07-08 | 2012-01-11 | 江苏秋林重工股份有限公司 | Eccentric shaft |
| CN105855808A (en) * | 2016-05-26 | 2016-08-17 | 镇江市经纬工程机械有限公司 | Eccentric sleeve and machining method for eccentric shaft machining |
-
1997
- 1997-06-09 CA CA 2207234 patent/CA2207234A1/en not_active Abandoned
- 1997-06-09 DE DE1997124281 patent/DE19724281A1/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102886650A (en) * | 2012-10-11 | 2013-01-23 | 常熟天地煤机装备有限公司 | Gear shaft shoulder fillet machining process |
| CN104942549A (en) * | 2015-07-21 | 2015-09-30 | 巨轮股份有限公司 | Manufacture process of robot RV reducer spline eccentric shaft |
Also Published As
| Publication number | Publication date |
|---|---|
| DE19724281A1 (en) | 1997-12-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5822837A (en) | Process for producing a frictional engagement | |
| US6119329A (en) | Connection between inner joint part and driveshaft | |
| US5308285A (en) | Method of making a bolt and washer assembly | |
| US5569005A (en) | Two-part deformable fastener | |
| US20060119099A1 (en) | Pipe joint structures and methods of manufacturing such structures | |
| US5078531A (en) | Ball joint | |
| JP2003074571A (en) | Srolling bearing unit for driving wheel and driving unit for car wheel | |
| CA2207234A1 (en) | Multi-piece eccentric shaft and method of manufacturing same | |
| CN112324925A (en) | Method for mounting valve needle and bearing bush in expansion valve of air conditioning system | |
| JPH11507147A (en) | Two-member pedal rod and method of manufacturing the same | |
| US5884365A (en) | Door hinge for a motor vehicle door | |
| US5848801A (en) | Apparatus for fastening a gas bag | |
| GB1604504A (en) | Blind fastener | |
| US5732985A (en) | Coupling hardware | |
| US5857915A (en) | Two-piece electric motor shaft | |
| US6619700B2 (en) | Banjo connector for coupling a brake hose to a brake caliper | |
| EP1401665A1 (en) | Mounting of the bearing unit for a wheel hub in a suspension system o fa motor vehicle | |
| GB2280231A (en) | Friction clutch | |
| JP2004519634A (en) | Bearing housing for rolling bearings and mechanical transmission members | |
| US20040134059A1 (en) | Method for fixing at least a guiding insert between two coaxial tubes, in particular in a motor vehicle anti-roll device | |
| US6267680B1 (en) | Device for connecting, to an external part, an inner armature core of a flexible joint | |
| US5831368A (en) | Rotor shaft retention for an electrical machine | |
| US6300851B1 (en) | Electromagnet system and method for assembling a core and a yoke in such a system | |
| JP3917707B2 (en) | Drive shaft manufacturing method | |
| JP3058276U (en) | Watch band |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |