GB2057627A - Worm transmission mechanism for a periodically varying load - Google Patents
Worm transmission mechanism for a periodically varying load Download PDFInfo
- Publication number
- GB2057627A GB2057627A GB8027763A GB8027763A GB2057627A GB 2057627 A GB2057627 A GB 2057627A GB 8027763 A GB8027763 A GB 8027763A GB 8027763 A GB8027763 A GB 8027763A GB 2057627 A GB2057627 A GB 2057627A
- Authority
- GB
- United Kingdom
- Prior art keywords
- worm
- wheel
- teeth
- worm wheel
- region
- 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.)
- Granted
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 38
- 230000007246 mechanism Effects 0.000 title claims abstract description 35
- 230000008859 change Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 229920003023 plastic Polymers 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims 1
- 239000007924 injection Substances 0.000 claims 1
- 238000010276 construction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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
- F16H—GEARING
- F16H1/00—Toothed gearings for conveying rotary motion
- F16H1/02—Toothed gearings for conveying rotary motion without gears having orbital motion
- F16H1/04—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members
- F16H1/12—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with non-parallel axes
- F16H1/16—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with non-parallel axes comprising worm and worm-wheel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
- B60S1/00—Cleaning of vehicles
- B60S1/02—Cleaning windscreens, windows or optical devices
- B60S1/04—Wipers or the like, e.g. scrapers
- B60S1/06—Wipers or the like, e.g. scrapers characterised by the drive
- B60S1/16—Means for transmitting drive
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
- B60S1/00—Cleaning of vehicles
- B60S1/02—Cleaning windscreens, windows or optical devices
- B60S1/04—Wipers or the like, e.g. scrapers
- B60S1/06—Wipers or the like, e.g. scrapers characterised by the drive
- B60S1/16—Means for transmitting drive
- B60S1/18—Means for transmitting drive mechanically
- B60S1/24—Means for transmitting drive mechanically by rotary cranks
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Gear Transmission (AREA)
- Gears, Cams (AREA)
- Transmission Devices (AREA)
Abstract
In a worm transmission mechanism which serves to transmit a periodically varying load, such as a windscreen wiper drive mechanism, the mechanism 10 comprises a worm wheel (14) having concave or globoidal teeth, which wheel meshes with a cylindrical worm (12). A region of the teeth of the worm wheel is subjected to a relatively light load is so constructed that the worm wheel (14) can be brought into mesh with the already initially mounted worm (12) in the direction of the axis of rotation of the worm wheel (14). For example said region may have straight spur teeth (48) extending from one face (46) to at least the centre of the width (50) of the wheel (14) or the region is without teeth from one face (46) of the wheel to the centre of the width (50) of the wheel (14). <IMAGE>
Description
SPECIFICATION
Worm transmission mechanism for a
periodically varying load
The invention relates to a worm transmission
mechanism for a periodically varying load.
A worm transmission mechanism is already
known in which the worm wheel is provided with
straight spur-gear teeth, which permit subsequent
mounting of the worm wheel when the worm is
already mounted in a housing. This is possible
because the tooth profile of a worm wheel having
straight spur-gear teeth is uniform across the
entire width of the teeth and is also parallel to the
axis of rotation of the worm wheel. The
disadvantage of a worm transmission mechanism
of such a construction is that the worm thread is
always only in point contact with the respective
tooth of the worm wheel with which it is meshed.
The specific load on the worm, and in particular on
the spur-gear teeth, is particularly heavy when the
load on the worm transmission mechanism
reaches its peak. It is known that if a worm wheel
having concave or globoidal teeth is used, line
contact exists between the cylindrical worm and
the globoidal worm wheel, whereby the specific
load on the teeth is substantially reduced;
however, it is quite impossible to assemble a
transmission of such a construction in the abovedescribed manner. First the worm wheel must be
mounted, and then the worm must be threaded
into mesh with the teeth of the worm wheel by
rotation of the worm in the manner of a screw.
According to the present invention there is
provided a worm wheel for use in a worm
transmission mechanism, having concave or
globoidal teeth, at least one region of which teeth
extending over a finite arcuate portion of the
wheel and from one face of the wheel to at least
the centre of the width of the wheel are not
concave or globoidal but are shaped to allow the wheel to be brought into mesh with the worm
after the worm is mounted in a housing.
Also according to the present invention there is
provided a worm transmission mechanism for a
periodically varying load, comprising a worm and a
worm wheel, wherein the varying load always acts
upon the same regions of the teeth of the worm
wheel, the worm wheel having concave or
globoidal teeth, and the teeth in at least one
region thereof, which region is suspected to a
relatively light load and extends from one face of
the wheel at least to the centre of the width of the
wheel, are not concave or globoidal, but are
shaped to allow the wheel to be brought into
mesh with the worm after the worm is mounted in
a housing.
In contrast to the known art, the worm
transmission mechanism according to the present
invention has the advantage that, when the transmission mechanism is subjected to the peak
load, the toothed segments of the worm wheel which are provided with concave or globoidal teeth are in mesh with the worm, whereby a
reduction of the specific load on the teeth of the
transmission mechanism is achieved. On the other
hand, assembly of the transmission mechanism is
simple, since a region is provided coinciding with
the relatively light load, without concave or
globoidal teeth at least from one face to the centre
of the width of the wheel thereby facilitating
assembly.
In one embodiment said region of relatively
light load is provided with straight spur-gear teeth
extending to at least the centre of the width of the
wheel and preferably extending the full width of
the wheel.
The same effect may be achieved if, instead of
segmental straight spur-gear toothing of the worm
wheel, the toothing in at least one region of the
worm wheel provided with concave or globoidal
toothing is removed to the middle region of the
width of the worm wheel. This region is brought
into mesh with the cylindrical worm during
assembly. The specific load on the teeth is, in fact,
thereby increased. However, if care is taken during
assembly to ensure that this region is in mesh with
the worm when the worm transmission
mechanism is subjected to a relatively light load,
no disadvantages are caused by this measure
according to the invention.
The invention will now be further described by
way of example with reference to the
accompanying drawings in which Figure 1 is a diagrammatic view of a wiping
device for motor-vehicle windscreens, having a
worm transmission mechanism in accordance
with the invention.
Figure 2 shows a cross-section along the line Il-Il of the worm wheel of Figure 1,
Figure 2a shows another embodiment of the
worm wheel according to Figure 2,
Figure 2b shows a further embodiment of the
worm wheel according to Figure 2, and
Figure 3 shows a cross-section along the line Ill-Ill of the worm wheel of Figure 1.
Referring to Figure 1, there is shown a wiping
device for motor-vehicle windscreens. The wiping.
device includes a worm transmission mechanism
generally indicated as 10 and comprising a
cylindrical worm 12, operatively connected to the
output shaft of a driving motor (not shown), and meshing with a worm wheel 14. The worm wheel
14 is manufactured from plastics material and has
concave or globoidal teeth 54. (see Figure 2). The
worm wheel 14 is mounted on a worm wheel
shaft 16, to which a crank 18, which rotates
together with the worm wheel 14, is fixedly
attached. To the free end of the crank 18 there is
coupled a connecting rod 20, whose other end is
linked to a rocker arm 22 fixedly mounted on a
wiper shaft 24 which is securely journalled in the
motor-vehicle body (not shown). A wiper blade 28
is operatively connected to the wiper shaft 24 via
a wiper arm 26 attached to the wiper shaft 24.
When the wiping device is in operation the crank
1 8 rotates in the direction of the arrow 30,
whereby the connecting rod 20 is moved in the
direction of the double arrow 32 and entrains the
rocker arm in the direction of the double arrow 34.
The rocker arm 22 pivots through an angle a from one point of reversal to another point of reversal.
The crank 18, the connecting rod 20 and the rocker arm 22 thus form a linkage. Together with the rocker arm 22, the wiper shaft 24, and with it the wiper blade 28, are also caused to perform a pivoting movement, as is shown by the double arrows 36 and 38. The wiper blade 28 sweeps a wiped area 40 on a motor-vehicle windscreen (not shown). The wiped area 40 is in the form of an annular segment, and the pivot angle p of the wiper blade 28 corresponds to the pivot angle a of the rocker arm 22.
It is evident that the torque applied to the transmission mechanism 10 varies in dependence on the respective position of the wiper blade 28 in the wiped area 40. This torque reduces to practically zero in the region of the points of reversal 42 of the .wiper blade 28, but reaches a peak value when the wiper blade 28 is in the central region of the wiped area 40, as shown in
Figure 1. The worm transmission mechanism 10 is therefore subjected to a periodically varying load.
For ease of assembly the worm wheel 14 should be inserted in a housing 44 enclosing the worm transmission mechanism 10 only when the transmission worm 12 is already fixed in position.
The worm wheel 14 is therefore brought into mesh with the transmission worm 12 perpendicularly to the plane of the drawing, i.e. in the direction of the axis of the wheel 14. It must be borne in mind that the worm wheel shaft 16 must also be mounted at the same time in its bearing (not shown) in the transmission housing 44. If the worm wheel is provided with so-called concave or globoidal teeth, such a method of assembly is not possible. Therefore, according to a first embodiment of the invention (shown in
Figure 2), a small region of the worm wheel 14 is provided with straight spur-gear teeth 48 adjacent to one lateral face 46 of the worm wheel 14. The straight spur-gear teeth 48 extend approximately to the middle of the width 50 of the worm wheel 14. As from this point the straight spur-gear teeth 48 change to globoidal teeth 52.All other regions of the periphery of the worm wheel 14 are provided with globoidal teeth 54, which extend across the full width 50 of the worm wheel 14.
Alternatively, however, according to another embodiment (shown in Figure 2b) a relatively small region of the periphery of the worm wheel 14 may be provided with straight spur-gear teeth 60 extending across the full width of the worm wheel 14, which then change again to the globoidal teeth 54. The transition may be effected gradually or in at least one step.
Alternatively, according to another embodiment of the invention, shown in Figure 2a, the worm wheel 14 may be provided with globoidal teeth 54 about the whole of its periphery. In order, however, to avoid the above-mentioned difficulties of assembly, the globoidal teeth 54 may be removed over a relatively small region, to the central region of the width 50 of the worm wheel, so that the worm wheel 14 is provided in this region of its periphery with globoidal teeth 70 which extend only from one lateral face 72 to the middle of the width 50 of the worm wheel.
The above-described special configurations of the small segments of the periphery of the respective worm wheels 14 ensure that each worm wheel can be brought in the abovementioned manner into mesh with the initially mounted transmission worm 12. However, care must be taken on assembly to ensure that the appliance which exerts torque on the worm transmission mechanism - in the present case the wiper blade 28 - is in a position in which only insubstantial, preferably minimal, forces act on the worm transmission mechanism 10. This ensures that, when the higher load is applied to the worm transmission mechanism 10 by the appliance, the worm 12 is in mesh with the full globoidal teeth 54, in which position the specific load on the tooth systems is decisively reduced.
A particularly economic method of manufacture of the worm wheel 14 with the special configurations shown in the drawings is possible if the worm wheel 14 is manufactured from plastics material, preferably by injection moulding.
Claims (15)
1. A worm wheel for use in a worm transmission mechanism, having concave or globoidal teeth, at least one region of which teeth extending over a finite arcuate portion of the wheel and from one face of the wheel to at least the centre of the width of the wheel, are not concave or globoidal but are shaped to allow the wheel to be brought into mesh with the worm after the worm is mounted in a housing.
2. A worm wheel as claimed in claim 1, in which the teeth in said region are straight spur teeth extending to the centre of the width of the worm.
3. A worm wheel as claimed in claim 2, in which the straight spur teeth extend across the full width of the wheel.
4. A worm wheel as claimed in claim 1, in which said region is without teeth from one face of the wheel to the centre of the width of said wheel.
5. A worm wheel as claimed in claim 1, constructed and arranged substantially as hereinbefore described with reference to and as illustrated in Figures 1, 2 and 3 or Figure 2a, or
Figure 2b of the accompanying drawings.
6. A worm transmission mechanism for a periodically varying load, comprising a worm and a worm wheel, wherein the varying load always acts upon the same regions of the teeth of the worm wheel, the worm wheel having concave or globoidal teeth, and the teeth in at least one region thereof, which region is subjected to a relatively light load and extends from one face of the wheel at least to the centre of the width of the wheel, are not concave or globoidal, but are shaped to allow the wheel to be brought into mesh with the worm after the worm is mounted in a housing.
7. A worm transmission mechanism for a periodically varying load, comprising a worm and a worm wheel, wherein the varying load acts always upon the same regions of the teeth of the worm wheel, the worm wheel being provided with concave or globoidal teeth, at least one region of the teeth of the worm wheel, which region is subjected to a relatively light load, is provided with straight spur-gear teeth extending from one face of the wheel at least to the centre of the width of the worm wheel.
8. A worm transmission mechanism as claimed in claim 7, in which the straight spur-gear teeth extend across the full width of the worm wheel.
9. A worm transmission mechanism as claimed in claim 7, in which said straight spur-gear teeth change to globoidal teeth extending from the centre of the width of the worm wheel to the other face.
10. A worm transmission mechanism for a periodically varying load, comprising a worm and a worm wheel, wherein the varying load acts always upon the same regions of the teeth of the worm wheel, the worm wheel being provided with concave or globoidal teeth, and at least one region of the worm wheel, which region is subjected to a relatively light load, being without teeth from one face of the wheel to the centre of the width of the worm wheel.
11. A worm transmission mechanism as claimed in any one of claims 7 to 10, which is part of a drive unit of a wiping device for motor-vehicle windscreens, said mechanism being connected to a linkage which is operatively associated with a wiper blade.
12. A worm transmission mechanism as claimed in claim 11, in which the region of the worm wheel provided with the straight spur-gear teeth or the region of the worm wheel without teeth from one face of the wheel to the centre of the width of the worm wheel, meshes with the worm when the wiper blade is at one of its points of reversal.
13. A worm transmission mechanism as claimed in any of claims 7 to 12, in which the worm wheel is manufactured from plastics material.
14. A worm transmission as claimed in claim 13, in which the worm wheel has been injection moulded.
15. A worm transmission mechanism, constructed and arranged substantially as hereinbefore described with reference to and as illustrated in Figures 1, 2 and 3 or Figure 2a or
Figure 2b of the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19792934874 DE2934874A1 (en) | 1979-08-29 | 1979-08-29 | WORM GEARS FOR PERIODICALLY CHANGING LOAD |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2057627A true GB2057627A (en) | 1981-04-01 |
| GB2057627B GB2057627B (en) | 1983-05-18 |
Family
ID=6079551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8027763A Expired GB2057627B (en) | 1979-08-29 | 1980-08-28 | Worm transmission mechanism for a periodically varying load |
Country Status (5)
| Country | Link |
|---|---|
| JP (2) | JPS5635837A (en) |
| DE (1) | DE2934874A1 (en) |
| FR (1) | FR2464412A1 (en) |
| GB (1) | GB2057627B (en) |
| IT (1) | IT1132496B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0047593A2 (en) * | 1980-08-29 | 1982-03-17 | Mastergear Company Limited | Wormwheel gears |
| GB2151745A (en) * | 1983-12-19 | 1985-07-24 | Brunswick Corp | Accessory gear drive for a two-stroke engine |
| EP0170989A1 (en) * | 1984-08-08 | 1986-02-12 | Siemens Aktiengesellschaft | Transmission device, especially one with a worm wheel |
| WO1999058866A1 (en) * | 1998-05-09 | 1999-11-18 | Robert Bosch Gmbh | Device for connecting a shaft to a disk |
| DE102010018079A1 (en) * | 2010-04-22 | 2011-10-27 | Ims Gear Gmbh | Shaft with a frontally cast gear and method of making such a shaft |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4107659A1 (en) * | 1991-03-09 | 1992-09-10 | Bosch Gmbh Robert | WORM GEAR |
| JP3103863B2 (en) * | 1993-12-27 | 2000-10-30 | 株式会社日立製作所 | Treatment method for radioactive laundry waste liquid |
| DE19718213A1 (en) | 1997-04-30 | 1998-11-05 | Bosch Gmbh Robert | gear |
| JP4852429B2 (en) * | 2005-01-19 | 2012-01-11 | 株式会社ミツバ | Rolling dies for forming gear gears and gear gears |
| US9651135B2 (en) * | 2014-02-14 | 2017-05-16 | Brose Fahrzeugteile Gmbh & Co. Kg, Wuerzburg | Gear unit of a motor vehicle actuating drive |
| DE102014211402A1 (en) * | 2014-06-13 | 2015-12-17 | Robert Bosch Gmbh | Motor vehicle actuator or wiper drive with a worm gear or Schneckenschraubradgetriebe |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2812668A (en) * | 1955-04-11 | 1957-11-12 | Danielson Mfg Company | Composite worm-helical gear construction |
| US3398590A (en) * | 1966-05-31 | 1968-08-27 | Al Craft Mfg Company | Side mount operator for awning type windows or the like |
| JPS499980U (en) * | 1972-05-03 | 1974-01-28 | ||
| GB1426946A (en) * | 1972-06-09 | 1976-03-03 | Ducellier & Cie | Means for operating the side-windows in automobile vehicles |
-
1979
- 1979-08-29 DE DE19792934874 patent/DE2934874A1/en active Granted
-
1980
- 1980-08-18 JP JP11277080A patent/JPS5635837A/en active Granted
- 1980-08-28 IT IT24323/80A patent/IT1132496B/en active
- 1980-08-28 GB GB8027763A patent/GB2057627B/en not_active Expired
- 1980-08-29 FR FR8018839A patent/FR2464412A1/en active Granted
-
1987
- 1987-10-13 JP JP62256451A patent/JPS63266249A/en active Granted
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0047593A2 (en) * | 1980-08-29 | 1982-03-17 | Mastergear Company Limited | Wormwheel gears |
| EP0047593A3 (en) * | 1980-08-29 | 1983-01-26 | Mastergear Company Limited | Wormwheel gears |
| GB2151745A (en) * | 1983-12-19 | 1985-07-24 | Brunswick Corp | Accessory gear drive for a two-stroke engine |
| EP0170989A1 (en) * | 1984-08-08 | 1986-02-12 | Siemens Aktiengesellschaft | Transmission device, especially one with a worm wheel |
| US4643040A (en) * | 1984-08-08 | 1987-02-17 | Siemens Aktiengesellschaft | Worm gear train arrangement and housing |
| WO1999058866A1 (en) * | 1998-05-09 | 1999-11-18 | Robert Bosch Gmbh | Device for connecting a shaft to a disk |
| DE102010018079A1 (en) * | 2010-04-22 | 2011-10-27 | Ims Gear Gmbh | Shaft with a frontally cast gear and method of making such a shaft |
| CN102235477A (en) * | 2010-04-22 | 2011-11-09 | Ims传动装置有限公司 | Shaft with a gear cast on its front side and method for producing such a shaft |
| CN102235477B (en) * | 2010-04-22 | 2016-03-16 | Ims传动装置有限公司 | Cogged axle and the method for the manufacture of this axle is connect in end face casting |
| US9464706B2 (en) | 2010-04-22 | 2016-10-11 | Ims Gear Gmbh | Shaft with a gear cast on its front side and method for producing such a shaft |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6353406B2 (en) | 1988-10-24 |
| FR2464412B1 (en) | 1984-03-16 |
| IT1132496B (en) | 1986-07-02 |
| FR2464412A1 (en) | 1981-03-06 |
| DE2934874A1 (en) | 1981-03-19 |
| DE2934874C2 (en) | 1988-08-04 |
| IT8024323A0 (en) | 1980-08-28 |
| JPS5635837A (en) | 1981-04-08 |
| JPH0240893B2 (en) | 1990-09-13 |
| GB2057627B (en) | 1983-05-18 |
| JPS63266249A (en) | 1988-11-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 746 | Register noted 'licences of right' (sect. 46/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |