GB2066418A - Shaft with Mounting Portion for Cylindrical Parts - Google Patents

Shaft with Mounting Portion for Cylindrical Parts Download PDF

Info

Publication number
GB2066418A
GB2066418A GB8039927A GB8039927A GB2066418A GB 2066418 A GB2066418 A GB 2066418A GB 8039927 A GB8039927 A GB 8039927A GB 8039927 A GB8039927 A GB 8039927A GB 2066418 A GB2066418 A GB 2066418A
Authority
GB
United Kingdom
Prior art keywords
shaft
mounting portion
diameter
depression
mounting
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.)
Withdrawn
Application number
GB8039927A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Volvo AB
Original Assignee
Volvo AB
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Volvo AB filed Critical Volvo AB
Publication of GB2066418A publication Critical patent/GB2066418A/en
Withdrawn legal-status Critical Current

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
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F16C35/063—Fixing them on the shaft
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
    • F16D1/06—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end

Abstract

A shaft (1) has a mounting portion for facilitating mounting of cylindrical parts, e.g. bearing (2), with clearance fit on the shaft. The mounting portion consists of a depression (3) in the shaft (1), surrounded by two edges (6, 7) spaced at a certain predetermined distance from each other and with the same diameter as the shaft, the shaft outside the outer edge (6) having a reduced diameter. The depression may comprise two conical surfaces (4, 5) or may be rounded. The outer edge (6) may be bevelled or rounded off to a width not exceeding 1 mm. <IMAGE>

Description

SPECIFICATION Shaft with Mounting Portion for Cylindrical Parts The present invention relates to a shaft with a mounting portion for facilitating the mounting of cylindrical parts with clearance fit on the shaft.
The problem on which the present invention is based is the so-called drawer-jam effect which can occur in the mounting of a cylindrical part on a shaft when the part is to be mounted with clearance fit. This drawer-jam effect occurs in the mounting portion before the part is fully guided.
The part is wedged fast and can only be loosened with the greatest difficulty. For bearings, as is most often the case, the bearing may be damaged and must be discarded, and in the worst case the shaft is also damaged.
In spite of the fact that we are dealing with an old problem, no satisfactory solutions have been produced, although there have been many proposals. Examples of such are changing the angle of the shaft end, rounding-off the transition between the mounting portion and the contact surface, and making the mounting portion in several steps. By mounting portion is meant here the portion of the shaft which is shaped to facilitate mounting of cylindrical parts.
Thus, the purpose of the present invention is to achieve a mounting portion on a shaft which makes it possible to mount cylindrical parts without having them wedge fast or jam.
This is solved by means ofthe present invention which is characterized in that the mounting portion consists of a depression in the shaft, surrounded by two edges spaced at a certain predetermined distance from each other and with the same diameter as the shaft, the shaft outside the outer edge having a reduced diameter.
The invention will be described in more detail below in connection with the accompanying drawing which shows a shaft with an embodiment of the mounting portion according to the invention.
The drawing shows a shaft 1 with a bearing 2 mounted thereon. The shaft can for example be a stub axle on a truck. The mounting portion 3 according to the embodiment shown in the drawing is a depression consisting of two conical surfaces 4 and 5 facing each other, The depression is surrounded by two edges 6 and 7 which have the same diameter as the shaft. The depression can also be rounded or have a flat bottom surface surrounded by the two edges.
The shape of the shaft outside the outer edge 6 is of minor importance. The only requirement which must be met is that the diameter of the shaft outside this edge must be less than the main diameter of the shaft.
The width of the mounting portion 3, i.e. the distance between the edges 6 and 7, is the critical dimension. This distance is dependent on the diameter of the shaft and can be expressed as a function of the same. Tests have shown that the distance between the two edges should be about 0.1-0.3 times the diameter of the shaft for clearance fit, i.e. a clearance of about 20-54 ,um. The best results are obtained when the distance is about 0.2 times the diameter of the shaft, and for a shaft with a diameter of 70 mm the distance will suitably be about 1 5 mm.
The depth of the mounting portion does not have the same critical importance, but it should be at least 0.5 mm. The width of the edge 6 can be at most about 1 mm.
The mounting of a cylindrical part, e.g. a bearing. proceeds as follows. If the bearing as it is being slipped onto the shaft comes out of parallel with the shaft, it slides down in the depression 3 and strikes the opposite inner surface 5 and is guided up on the same. When it subsequently passes the edge 7 it has full guidance, thus eliminating the risk of the so-called drawer-jam effect.
Claims
1. A shaft with a mounting portion for facilitating mounting of cylindrical parts with clearance fit on the shaft, characterized in that the mounting portion consists of a depression in the shaft, surrounded by two edges spaced at a certain predetermined distance from each other and with the same diameter as the shaft, the shaft outside the outer edge having a reduced diameter.
2. A shaft as claimed in claim 1, characterized in that the width of the depression is about 0.1 - 0.3 times the diameter of the shaft.
3. A shaft as claimed in claim 1, characterized in that the width of the depression is about 0.2 times the diameter of the shaft.
4. A shaft as claimed in claims 1-3, characterized in that the depression consists of two conical surfaces facing each other.
5. A shaft as claimed in claims 1-3, characterized in that the depression is rounded.
6. A shaft as claimed in claims 1-5, characterized in that the outer edge is bevelled or rounded-off to a width of at most 1 mm.
7. A shaft substantially as hereinbefore described with reference to and as shown in the accompanying drawing.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (7)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Shaft with Mounting Portion for Cylindrical Parts The present invention relates to a shaft with a mounting portion for facilitating the mounting of cylindrical parts with clearance fit on the shaft. The problem on which the present invention is based is the so-called drawer-jam effect which can occur in the mounting of a cylindrical part on a shaft when the part is to be mounted with clearance fit. This drawer-jam effect occurs in the mounting portion before the part is fully guided. The part is wedged fast and can only be loosened with the greatest difficulty. For bearings, as is most often the case, the bearing may be damaged and must be discarded, and in the worst case the shaft is also damaged. In spite of the fact that we are dealing with an old problem, no satisfactory solutions have been produced, although there have been many proposals. Examples of such are changing the angle of the shaft end, rounding-off the transition between the mounting portion and the contact surface, and making the mounting portion in several steps. By mounting portion is meant here the portion of the shaft which is shaped to facilitate mounting of cylindrical parts. Thus, the purpose of the present invention is to achieve a mounting portion on a shaft which makes it possible to mount cylindrical parts without having them wedge fast or jam. This is solved by means ofthe present invention which is characterized in that the mounting portion consists of a depression in the shaft, surrounded by two edges spaced at a certain predetermined distance from each other and with the same diameter as the shaft, the shaft outside the outer edge having a reduced diameter. The invention will be described in more detail below in connection with the accompanying drawing which shows a shaft with an embodiment of the mounting portion according to the invention. The drawing shows a shaft 1 with a bearing 2 mounted thereon. The shaft can for example be a stub axle on a truck. The mounting portion 3 according to the embodiment shown in the drawing is a depression consisting of two conical surfaces 4 and 5 facing each other, The depression is surrounded by two edges 6 and 7 which have the same diameter as the shaft. The depression can also be rounded or have a flat bottom surface surrounded by the two edges. The shape of the shaft outside the outer edge 6 is of minor importance. The only requirement which must be met is that the diameter of the shaft outside this edge must be less than the main diameter of the shaft. The width of the mounting portion 3, i.e. the distance between the edges 6 and 7, is the critical dimension. This distance is dependent on the diameter of the shaft and can be expressed as a function of the same. Tests have shown that the distance between the two edges should be about 0.1-0.3 times the diameter of the shaft for clearance fit, i.e. a clearance of about 20-54 ,um. The best results are obtained when the distance is about 0.2 times the diameter of the shaft, and for a shaft with a diameter of 70 mm the distance will suitably be about 1 5 mm. The depth of the mounting portion does not have the same critical importance, but it should be at least 0.5 mm. The width of the edge 6 can be at most about 1 mm. The mounting of a cylindrical part, e.g. a bearing. proceeds as follows. If the bearing as it is being slipped onto the shaft comes out of parallel with the shaft, it slides down in the depression 3 and strikes the opposite inner surface 5 and is guided up on the same. When it subsequently passes the edge 7 it has full guidance, thus eliminating the risk of the so-called drawer-jam effect. Claims
1. A shaft with a mounting portion for facilitating mounting of cylindrical parts with clearance fit on the shaft, characterized in that the mounting portion consists of a depression in the shaft, surrounded by two edges spaced at a certain predetermined distance from each other and with the same diameter as the shaft, the shaft outside the outer edge having a reduced diameter.
2. A shaft as claimed in claim 1, characterized in that the width of the depression is about 0.1 - 0.3 times the diameter of the shaft.
3. A shaft as claimed in claim 1, characterized in that the width of the depression is about 0.2 times the diameter of the shaft.
4. A shaft as claimed in claims 1-3, characterized in that the depression consists of two conical surfaces facing each other.
5. A shaft as claimed in claims 1-3, characterized in that the depression is rounded.
6. A shaft as claimed in claims 1-5, characterized in that the outer edge is bevelled or rounded-off to a width of at most 1 mm.
7. A shaft substantially as hereinbefore described with reference to and as shown in the accompanying drawing.
GB8039927A 1979-12-28 1980-12-12 Shaft with Mounting Portion for Cylindrical Parts Withdrawn GB2066418A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7910724A SE427867B (en) 1979-12-28 1979-12-28 AXEL WITH ENTRING PHASE FOR CYLINDRICAL DETAILS

Publications (1)

Publication Number Publication Date
GB2066418A true GB2066418A (en) 1981-07-08

Family

ID=20339662

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8039927A Withdrawn GB2066418A (en) 1979-12-28 1980-12-12 Shaft with Mounting Portion for Cylindrical Parts

Country Status (6)

Country Link
JP (1) JPS5697626A (en)
DE (1) DE3048131A1 (en)
FR (1) FR2472690A1 (en)
GB (1) GB2066418A (en)
IT (1) IT1128711B (en)
SE (1) SE427867B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5951794A (en) * 1996-12-18 1999-09-14 Aluminum Company Of America Method of forming a drive shaft
US6247346B1 (en) 1996-12-18 2001-06-19 Alcoa Inc. Method of forming a drive shaft
US6319134B1 (en) * 1996-11-01 2001-11-20 American Axle & Manufacturing, Inc. Aluminum drive shaft
US6708809B2 (en) * 2000-06-12 2004-03-23 Mcclay Scott Clutch shaft stress relief
CN102966663A (en) * 2012-11-05 2013-03-13 无锡新大力电机有限公司 Motor driving shaft with conical structure

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5995061B2 (en) 2012-05-18 2016-09-21 株式会社大成モナック Telescopic work machine

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2130931A5 (en) * 1971-03-25 1972-11-10 Essieux Ste Ardennaise
DE2204831C3 (en) * 1972-02-02 1975-03-27 A. Ehrenreich & Cie, 4000 Duesseldorf Method for the axial fixing of a component

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6319134B1 (en) * 1996-11-01 2001-11-20 American Axle & Manufacturing, Inc. Aluminum drive shaft
US6662423B2 (en) 1996-11-01 2003-12-16 American Axle & Manufacturing, Inc. Method of producing a drive shaft
US5951794A (en) * 1996-12-18 1999-09-14 Aluminum Company Of America Method of forming a drive shaft
US6247346B1 (en) 1996-12-18 2001-06-19 Alcoa Inc. Method of forming a drive shaft
US6708809B2 (en) * 2000-06-12 2004-03-23 Mcclay Scott Clutch shaft stress relief
CN102966663A (en) * 2012-11-05 2013-03-13 无锡新大力电机有限公司 Motor driving shaft with conical structure

Also Published As

Publication number Publication date
JPS5697626A (en) 1981-08-06
SE7910724L (en) 1981-06-29
IT1128711B (en) 1986-06-04
FR2472690A1 (en) 1981-07-03
IT8050425A0 (en) 1980-12-19
DE3048131A1 (en) 1981-09-10
SE427867B (en) 1983-05-09

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)