CN116568544A - Speed reducer - Google Patents
Speed reducer Download PDFInfo
- Publication number
- CN116568544A CN116568544A CN202180081753.8A CN202180081753A CN116568544A CN 116568544 A CN116568544 A CN 116568544A CN 202180081753 A CN202180081753 A CN 202180081753A CN 116568544 A CN116568544 A CN 116568544A
- Authority
- CN
- China
- Prior art keywords
- cover
- ventilation
- housing
- opening
- axial direction
- 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.)
- Pending
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K17/00—Arrangement or mounting of transmissions in vehicles
- B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
- B60K17/06—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of change-speed gearing
-
- 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
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/027—Gearboxes; Mounting gearing therein characterised by means for venting gearboxes, e.g. air breathers
Abstract
A speed reducer (100) is provided with: a housing (11) having an opening (10); a cover (12) that closes the opening (10) of the housing (11); and a ventilation member (13) which is provided to the cover (12) and ventilates the inside and outside of the housing, wherein the ventilation member (13) has a ventilation film (13 c) that allows the passage of gas, and the ventilation film (13 c) is located outside the outer surface (18) of the cover (12) in the axial direction of the opening (10).
Description
Technical Field
The present invention relates to a speed reducer.
Background
In japanese patent application laid-open No. 2020-50130A, a speed reducer provided to a direction changing device of a vehicle or the like is disclosed. In the reduction gear disclosed in patent document 1, a cover is attached to a casing that accommodates the reduction gear. The cover has a recess recessed inside the housing, and a breather valve is mounted on the recess. The breather valve is mounted so as to be positioned inside the housing, as compared to the outer surface of the cover.
Disclosure of Invention
The direction in which the speed reducer mounted on the vehicle is installed varies according to the type of the vehicle. In the decelerator described in JP2020-50130A, since the breather valve is provided in the recess of the cover, water such as rainwater is accumulated in the recess of the cover due to the decelerator being provided in the direction of the vehicle, and the breather valve is submerged, and the function of the breather valve may be impaired.
The present invention has been made in view of the above-described problems, and an object thereof is to maintain the function of a ventilation member regardless of the orientation of a decelerator.
According to one aspect of the present invention, a speed reducer includes: a housing having an opening; a cover closing the opening of the housing; and a ventilation member that is provided to the cover and that ventilates the inside and outside of the housing, the ventilation member having a ventilation film that allows passage of gas, the ventilation film being located outside the outer surface of the cover in the axial direction of the opening.
Drawings
Fig. 1 is a partial cross-sectional view of a reduction gear according to an embodiment of the present invention.
Fig. 2 is a top view of a cover provided with a vent member.
Fig. 3 is an enlarged cross-sectional view of the perimeter of the venting member.
Fig. 4 is a plan view of a cover according to a modification.
Fig. 5 is an enlarged cross-sectional view of a cover according to a modification.
Detailed Description
A reduction gear 100 according to an embodiment of the present invention will be described with reference to the drawings. In the present embodiment, a case where the reduction gear 100 is used in an electric power steering apparatus will be described.
The electric power steering apparatus decelerates a driving force of an electric motor (not shown) by the decelerator 100 and applies the decelerated driving force to a rack shaft (not shown) as a rotational torque for assisting steering of a steering wheel by a driver.
As shown in fig. 1, the speed reducer 100 includes: a worm shaft 1 to which a driving force from an electric motor is input; a worm wheel 2 engaged with the worm shaft 1; a pinion shaft 3 that rotates integrally with the worm wheel 2; a pinion 4 formed on the pinion shaft 3 and meshed with the rack shaft; bearings 5 and 6 rotatably support the pinion shaft 3.
The driving force from the electric motor is transmitted to the rack shaft via the worm shaft 1, the worm wheel 2, the pinion shaft 3, and the pinion 4, and acts to assist the steering force of the driver.
The decelerator 100 includes: a housing 11 having an opening 10; a cover 12 closing the opening 10 of the housing 11; and a ventilation member 13 provided in the cover 12 and ventilating the inside and the outside of the housing 11. The ventilation member 13 is configured to cut off the passage of water and allow the passage of gas. Even if the temperature in the housing 11 increases due to the operation of the electric motor, the speed reducer 100, and the like, the pressure in the housing 11 is kept constant by the ventilation member 13. The housing 11 and the cover 12 are fixed by a plurality of bolts 15 as fastening members.
As shown in fig. 1 and 2, the cover 12 includes: a body portion 12a inserted into the opening portion 10 of the housing 11; and a mounting portion 12b formed to protrude from an outer peripheral portion of the body portion 12a in a radial direction. The body portion 12a is formed in a circular plate shape, and the mounting portion 12b is formed in a semicircular shape.
The main body 12a is provided with a communication hole 12c for communicating the inside and outside of the housing 11 closed by the cover 12. The communication hole 12c is provided in the center of the body portion 12a, and penetrates the body portion 12a in the axial direction. As shown in fig. 3, the communication hole 12c is formed with a large diameter portion 12d that opens to the outside of the housing 11 and a small diameter portion 12e that opens to the inside of the housing 11 and has a smaller diameter than the large diameter portion 12 d. In the communication hole 12c, an annular pedestal portion 19 is formed by the large diameter portion 12d and the small diameter portion 12e. As described in detail later, the ventilation member 13 is provided in the communication hole 12c.
The mounting portion 12b is formed with an insertion hole 12f through which the bolt 15 is inserted. The mounting portion 12b is pressed and fixed to the end surface of the housing 11 by the tightening force of the bolt 15.
The cover 12 has an outer surface 18 facing the axially outer side of the opening 10 of the housing 11. The outer surface 18 is formed by the outer surface 16 of the body portion 12a and the outer surface 17 of the mounting portion 12 b. In the present embodiment, the outer surface 18 is formed in a planar shape in which the outer surface 16 and the outer surface 17 are continuous.
As shown in fig. 2 and 3, the cover 12 further includes a wall 12g surrounding the ventilation member 13. The wall portion 12g is provided to the body portion 12a, annularly surrounds the communication hole 12c, and protrudes in the axial direction from the outer surface 16 of the body portion 12a. The wall portion 12g protects the ventilation member 13 from water and foreign matter and does not constitute the outer surface 18 of the cover 12. A slit 12h extending in the axial direction of the opening 10 of the housing 11 so as to extend from the outer surface 16 to the top of the wall 12g is formed in the wall 12g. The slit 12h penetrates the wall portion 12g in the radial direction. In the present embodiment, the slit 12h is provided such that the bottom 12i is coplanar with the outer surface 16. In addition, a plurality of slits 12h are provided at equal intervals in the circumferential direction of the wall 12g, and in the present embodiment, four slits are provided.
As shown in fig. 3, the ventilation member 13 includes a main body portion 13a, a through hole 13b penetrating the main body portion 13a, and a ventilation film 13c provided in the through hole 13 b. The main body 13a is made of, for example, resin, and has a large diameter portion 13d and a small diameter portion 13e. An annular hook portion 13f is formed at an end of the small diameter portion 13e. The through hole 13b penetrates the body portion 13a in the axial direction. The ventilation film 13c is a film that cuts off the passage of water but allows the passage of gas, and is provided so as to close the opening end surface on the large diameter portion 13d side in the through hole 13 b.
Next, the relationship between the cover 12 and the ventilation member 13 will be described in detail.
As shown in fig. 3, the ventilation member 13 is inserted into the communication hole 12c through the body portion 13a, and is attached to the cover 12 by sandwiching the pedestal portion 19 of the communication hole 12c between the large diameter portion 13d and the hook portion 13f. A seal member 14 for closing between the ventilation member 13 and the communication hole 12c is provided between the body portion 13a and the pedestal portion 19 in a compressed state. The seal member 14 is an annular elastic member such as an O-ring. The ventilation film 13c is located outside the outer surface 18 of the cover 12 in the axial direction of the opening 10 of the housing 11. Specifically, the ventilation film 13c is located outside the outer surface 16 of the body portion 12a and the outer surface 17 of the mounting portion 12b in the axial direction of the opening portion 10. The ventilation film 13c is provided so as not to be exposed from the wall 12g in the axial direction.
Here, the orientation in which the speed reducer is provided is different according to the kind of vehicle. As a result, in the decelerator having the cover, the cover may be provided to the vehicle so as to face upward in the vertical direction. In addition, the decelerator may receive rainwater, muddy water, washing water, or the like. Therefore, in the decelerator provided with the ventilation member on the cover, water is accumulated on the outer surface of the cover, and the ventilation member may be submerged, in which case the function of the ventilation member may be impaired.
In the decelerator 100 of the present embodiment, the ventilation film 13c of the ventilation member 13 is located outside the outer surface 18 of the cover 12 in the axial direction of the opening 10 of the housing 11. That is, even if the decelerator 100 is provided in the vehicle so that the cover 12 faces upward in the vertical direction, the ventilation film 13c is provided at a position higher than the outer surface 18 of the cover 12. Thus, the air-permeable membrane 13c can be prevented from being submerged regardless of the orientation of the decelerator 100. Therefore, the function of the ventilation member 13 can be maintained.
In addition, the wall portion 12g of the cover 12 is formed to be higher than the ventilation membrane 13c. Accordingly, the ventilation film 13c can be protected by the wall portion 12g from water such as rainwater, muddy water, washing water, and foreign matter. In addition, during high-pressure cleaning of the vehicle, even if the cover 12 receives high-pressure cleaning water, the wall portion 12g protects the air-permeable membrane 13c. Therefore, the function of the ventilation member 13 can be maintained.
Further, a slit 12h is provided in a wall portion 12g of the cover 12. Thus, even if water enters the wall 12g, the water entering the wall 12g is discharged through the slit. Therefore, the ventilation film 13c is prevented from being submerged in water, and the function of the ventilation member 13 can be maintained. In addition, water can be prevented from entering the housing 11 from between the cover 12 and the ventilation member 13.
According to the present embodiment described above, the following operational effects are achieved.
Since the ventilation film 13c of the ventilation member 13 is located outside the outer surface 18 of the cover 12 in the axial direction of the opening 10 of the housing 11, the ventilation film 13c is located at a position higher than the outer surface 18 of the cover 12 even if the speed reducer 100 is installed in the vehicle so that the cover 12 faces upward in the vertical direction. Thus, the air-permeable membrane 13c can be prevented from being submerged regardless of the orientation of the decelerator 100. Therefore, the function of the ventilation member 13 can be maintained.
Since the wall portion 12g of the cover 12 is formed to be higher than the ventilation film 13c, the ventilation film 13c can be protected from water such as rainwater, muddy water, washing water, and the like and foreign matter by the wall portion 12g. In addition, during high-pressure cleaning of the vehicle, even if the cover 12 receives high-pressure cleaning water, the wall portion 12g protects the air-permeable membrane 13c. Therefore, the function of the ventilation member 13 can be maintained.
Since the wall 12g of the cover 12 is provided with the slit 12h, even if water enters the wall 12, the water entering the wall 12g is discharged through the slit 12h. Therefore, the ventilation film 13c is prevented from being submerged in water, and the function of the ventilation member 13 can be maintained. In addition, water can be prevented from entering the housing 11 from between the cover 12 and the ventilation member 13.
Next, a modification of the present embodiment will be described.
In the above embodiment, the ventilation member 13 is provided in the communication hole 12c in the center of the body portion 12a of the cover 12. However, the position where the ventilation member 13 is provided is not limited thereto. For example, as shown in fig. 4, the vent 12c and the vent member 13 may be provided at a position separated from the center of the body 12a. By changing the position of the ventilation member 13, interference between other parts of the vehicle in which the reduction gear 100 is provided and the ventilation member 13 can be avoided.
In the above embodiment, the outer surface 18 of the cover 12 is formed in a planar shape in which the outer surface 16 of the body 12a and the outer surface 17 of the mounting portion 12b are continuous. However, the outer surface 18 is not limited to a planar shape. The shape of the outer surface 18 may be any shape as long as the ventilation film 13c of the ventilation member 13 is positioned outside any surface of the outer surface 18 of the cover 12 in the axial direction of the opening 10 of the housing 11. For example, as shown in fig. 5, a case will be described in which a step is formed between the body portion 12a and the mounting portion 12b, and the outer surface 17 of the mounting portion 12b is located outside the outer surface 16 of the body portion 12a in the axial direction of the opening portion 10 of the housing 11. In this case, the vicinity of the communication hole 12c in the main body 12a may be raised, so that the ventilation film 13c of the ventilation member 13 may be positioned outside the outer surface 17 of the mounting portion 12 b. Further, the ventilation film 13c of the ventilation member 13 may be positioned outside the outer surface 17 of the mounting portion 12b by making the ventilation member 13 longer in the axial direction.
In the above embodiment, the slit 12h is provided such that the bottom 12i thereof is coplanar with the outer surface 16. However, the shape of the slit 12h is not limited to the above. For example, the bottom 12i of the slit 12h may be located between the outer surface 16 of the body 12a and the vent film 13c in the axial direction of the opening 10 of the housing 11. That is, the bottom 12i of the slit 12h may be flush with the outer surface 16 of the body 12a (in the above embodiment) or may be located outside the outer surface 16 in the axial direction of the opening 10 and inside the ventilation film 13c in the axial direction of the opening 10. In this configuration, even if the decelerator 100 is provided in the vehicle such that the cover 12 is oriented upward in the vertical direction, the bottom 12i of the slit 12h is not located at a position lower than the outer surface 16 of the body 12a, and is not located at a position higher than the ventilation film 13c. Thus, the water having entered the wall portion 12g is more reliably discharged regardless of the orientation of the decelerator 100, and the ventilation membrane 13c is prevented from being submerged. Therefore, the function of the ventilation member 13 can be maintained. The shape of the slit 12h is not limited to the above, as long as the slit 12h is configured to drain water entering the wall 12g, thereby preventing the air-permeable membrane 13c from being submerged in water.
The structure, operation, and effects of the embodiment of the present invention configured as described above will be summarized.
The decelerator 100 includes: a housing 11 having an opening 10; a cover 12 closing the opening 10 of the housing 11; and a ventilation member 13 provided on the lid 12 and ventilating the inside and outside of the housing, the ventilation member 13 having a ventilation film 13c through which gas passes, the ventilation film 13c being located outside the outer surface 18 of the lid 12 in the axial direction of the opening 10.
In this configuration, the ventilation film 13c of the ventilation member 13 is located outside the outer surface 18 of the cover 12 in the axial direction of the opening 10 of the housing 11. Thus, the air-permeable membrane 13c can be prevented from being submerged regardless of the orientation of the decelerator 100. Therefore, the function of the ventilation member 13 can be maintained.
The cover 12 further includes a wall portion 12g protruding from the outer surface 18 and surrounding the ventilation member 13, and the ventilation film 13c is provided so as not to be exposed from the wall portion 12g in the axial direction.
In this structure, the wall portion 12g of the cover 12 is formed to be higher than the ventilation membrane 13c. Thereby, the ventilation film 13c can be protected from water and foreign matter by the wall portion 12g. Therefore, the function of the ventilation member 13 can be maintained.
Further, the wall 12g is provided with a slit 12h extending in the axial direction.
In this configuration, water that has entered the wall 12g is discharged through the slit 12h. Therefore, the ventilation film 13c is prevented from being submerged in water, and the function of the ventilation member 13 can be maintained.
The cover 12 further includes a body 12a in which the wall 12g is provided, and a bottom 12i of the slit 12h is axially located between the outer surface 16 of the body 12a and the ventilation membrane 13c.
In this configuration, the water that has entered the wall portion 12g is more reliably discharged through the slit 12h of the wall portion 12g.
The embodiments of the present invention have been described above, but the above embodiments merely represent some application examples of the present invention, and do not limit the technical scope of the present invention to the specific configurations of the above embodiments.
Although the above embodiment describes an example in which the present invention is applied to the decelerator 100 of the electric power steering apparatus, the present invention can be applied to decelerator of various machines such as a conveyor, a winch, a machine tool, and a construction machine.
The present application claims priority based on japanese patent application nos. 2021-1065, which were filed to the japanese patent office at 1-6 of 2021, and the entire contents of this application are incorporated herein by reference.
Claims (4)
1. A speed reducer is provided with:
a housing having an opening;
a cover closing the opening of the housing;
a ventilation member provided in the cover and ventilating the inside and outside of the housing,
the venting member has a venting membrane that allows passage of gas,
the ventilation film is located outside the outer surface of the cover in the axial direction of the opening.
2. The decelerator according to claim 1, wherein,
the cover also has a wall portion protruding from the outer surface and surrounding the venting member,
the ventilation film is provided so as not to be exposed from the wall portion in the axial direction.
3. The decelerator as claimed in claim 2, wherein,
on the wall portion, a slit extending in the axial direction is provided.
4. The decelerator according to claim 3, wherein,
the cover also has a body portion for the wall portion to be disposed,
the bottom of the slit is located between the outer surface of the body portion and the vent membrane in the axial direction.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021001065A JP7240425B2 (en) | 2021-01-06 | 2021-01-06 | Decelerator |
| JP2021-001065 | 2021-01-06 | ||
| PCT/JP2021/043694 WO2022149370A1 (en) | 2021-01-06 | 2021-11-29 | Reduction gear |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116568544A true CN116568544A (en) | 2023-08-08 |
Family
ID=82357661
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202180081753.8A Pending CN116568544A (en) | 2021-01-06 | 2021-11-29 | Speed reducer |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP7240425B2 (en) |
| CN (1) | CN116568544A (en) |
| WO (1) | WO2022149370A1 (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013044396A (en) * | 2011-08-24 | 2013-03-04 | Mitsuba Corp | Ventilation structure |
| JP6981050B2 (en) * | 2017-06-05 | 2021-12-15 | 株式会社デンソー | Electronic device |
| JP2020050130A (en) * | 2018-09-27 | 2020-04-02 | 株式会社ジェイテクト | Steering gear |
-
2021
- 2021-01-06 JP JP2021001065A patent/JP7240425B2/en active Active
- 2021-11-29 WO PCT/JP2021/043694 patent/WO2022149370A1/en active Application Filing
- 2021-11-29 CN CN202180081753.8A patent/CN116568544A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JP7240425B2 (en) | 2023-03-15 |
| JP2022106213A (en) | 2022-07-19 |
| WO2022149370A1 (en) | 2022-07-14 |
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