CN204572998U - A kind of gear assembly, speed changer and automobile - Google Patents
A kind of gear assembly, speed changer and automobile Download PDFInfo
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- CN204572998U CN204572998U CN201520184121.6U CN201520184121U CN204572998U CN 204572998 U CN204572998 U CN 204572998U CN 201520184121 U CN201520184121 U CN 201520184121U CN 204572998 U CN204572998 U CN 204572998U
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- gear
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- locking
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- 230000005540 biological transmission Effects 0.000 claims abstract description 57
- 238000010276 construction Methods 0.000 claims description 3
- 238000003825 pressing Methods 0.000 description 12
- 230000008901 benefit Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000009429 electrical wiring Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
The utility model provides a kind of gear assembly, speed changer and automobile, relates to technical field of automobile, is the problem that the beat noise solving speed changer is large.Described gear assembly comprises: be arranged at the gear in the cavity of case of transmission, the cam be connected with described gear, the depression bar hinged with described case of transmission, and the elastic component be connected with described case of transmission with described depression bar respectively; Wherein, one end of described depression bar contacts with the contoured surface of described cam, and described elastic component promotes described gear by described depression bar to the direction contrary with described gear sense of rotation.Gear assembly described in the utility model is applied to automobile.
Description
Technical Field
The utility model relates to the technical field of auto-parts, in particular to gear assembly, derailleur and car.
Background
NVH (Noise, Vibration and Harshness) performance of an automobile transmission system is one of main indexes for evaluating NVH performance of a finished automobile, wherein knocking Noise of a transmission particularly affects the NVH performance of the finished automobile. The knocking noise of the transmission is mainly caused by the fact that gaps exist among teeth of gears meshed with each other, when an automobile runs at a low speed, vibration of the transmission is large, so that the teeth of the gears meshed with each other are impacted, and the knocking noise is generated.
In order to reduce the knocking noise, a conventional gear assembly includes a first gear and a second gear fixedly connected to the first gear, the first gear and the second gear are coaxial and closely attached to each other, and teeth of the first gear and teeth of the second gear are staggered by a certain angle.
However, since the first gear and the second gear have a certain tolerance in the manufacturing process and a certain tolerance in the assembling process of the first gear and the second gear, a gear assembly including the first gear and the second gear may have a certain error such that a distance between an upper tooth surface of a tooth of the first gear and a lower tooth surface of a tooth of the adjacent second gear is smaller than a gap between two adjacent teeth of the other gear; that is, when the vibration of the transmission is large, a collision may still occur between the gear assembly and another gear, so that rattling noise occurs. Therefore, such gear assemblies are not effective in attenuating transmission rattle noise.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention is directed to a gear assembly to effectively reduce the rattling noise of a transmission.
In order to achieve the above purpose, the technical scheme of the utility model is realized like this:
a gear assembly, comprising: the gear is arranged in a cavity of the transmission shell, the cam is connected with the gear, the pressure rod is hinged with the transmission shell, and the elastic piece is respectively connected with the pressure rod and the transmission shell; one end of the pressure lever is in contact with the profile surface of the cam, and the elastic piece pushes the gear to the direction opposite to the rotation direction of the gear through the pressure lever.
Further, the gear assembly further comprises: drive arrangement, locking round pin and with cam fixed connection's connecting piece, the cam pass through the connecting piece with gear connection, the gear suit is in on the connecting piece, be provided with the cotter way in the gear, the connecting piece with the region that the cotter way corresponds is provided with the locking groove, the locking round pin is located in the cotter way, drive arrangement with the locking round pin links to each other, the locking round pin is in stretch out under drive arrangement's the cotter way, and stretch into in the locking groove, so that the cam with the gear links to each other.
Preferably, the cam is of integral construction with the connector.
Preferably, the driving device is a locking spring, the locking spring is arranged in the pin groove, and the locking pin extends into the locking groove when the locking spring is in an initial state.
Further, the surface of the compression bar, which is in contact with the contour surface of the cam, is a smooth curved surface.
Preferably, one end of the pressure lever is provided with a cylindrical roller in a rolling manner, and the pressure lever is in contact with the profile surface of the cam through the cylindrical roller.
Optionally, the elastic member is a telescopic spring.
Compared with the prior art, the gear assembly of the utility model has the following advantages:
when a gear in the gear assembly is meshed with another gear, the other gear rotates in a first direction, the gear in the gear assembly rotates in a second direction, the elastic part pushes the pressure rod to enable the pressure rod to rotate a certain angle around a connecting part of the pressure rod and the transmission shell, one end of the pressure rod, which is in contact with the cam, applies a torque to the cam to enable the cam to rotate a certain angle in the first direction, and as the cam is connected with the gear in the gear assembly, the cam can apply a torque to the gear in the gear assembly to enable the gear in the gear assembly to obtain the torque in the first direction, so that a working surface of a tooth of the gear in the gear assembly is more tightly attached to a working surface of a tooth of the other gear, when the transmission vibrates, the tooth of the gear in the gear assembly is not easy to separate from the tooth of the other gear, and therefore, thereby effectively reducing rattle noise in the transmission.
Another object of the present invention is to provide a transmission to effectively reduce the knocking noise of the transmission.
In order to achieve the above purpose, the technical scheme of the utility model is realized like this:
the transmission comprises a transmission shell with a cavity and a gear assembly arranged in the cavity, wherein a pressure rod of the gear assembly is hinged with the transmission shell, and an elastic piece of the gear assembly is connected with the pressure rod and the transmission shell respectively.
Compared with the prior art, the derailleur have following advantage:
the transmission has the same advantages as the gear assembly described above with respect to the prior art and will not be described in detail here.
Another object of the present invention is to provide a car to effectively reduce the knocking noise of the transmission.
In order to achieve the above purpose, the technical scheme of the utility model is realized like this:
an automobile is provided with the transmission according to the technical scheme in the automobile.
Compared with the prior art, the automobile has the following advantages:
the advantages of the vehicle and the transmission described above with respect to the prior art are the same and are not described in detail here.
Drawings
The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:
FIG. 1 is a partial schematic view of a prior art gear assembly in an operating condition;
FIG. 2 is a schematic view of a gear assembly according to an embodiment of the present invention in an operating state;
FIG. 3 is a front view of a cam in the gear assembly of FIG. 2;
FIG. 4 is a cross-sectional view taken along line C-C of FIG. 3;
FIG. 5 is a front view of the gears in the gear assembly of FIG. 2;
fig. 6 is a sectional view taken in the direction D-D of fig. 5.
Description of reference numerals:
1-transmission housing, 21, 22-gear,
31-a pressure bar, 32-a cylindrical roller,
4-an elastic member, 5-a cam,
6-connecting piece, 71-locking pin,
72-locking groove, 73-pin groove,
8-locking spring, 101-teeth of the first gear,
102-teeth of a second gear, 201, 202-teeth of another gear.
Detailed Description
It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Example one
Referring to fig. 2, an embodiment of the present invention provides a gear assembly, including: the gear 21, the cam 5, the pressure lever 31 and the elastic piece 4 are respectively arranged in the transmission housing 1, wherein the cam 5 is connected with the gear 21, one end of the pressure lever 31 is hinged with the transmission housing 1, the other end of the pressure lever is in contact with the profile surface of the cam 5, one end of the elastic piece 4 is connected with the pressure lever 31, and the other end of the elastic piece is connected with the transmission housing 1.
When the gear 21 in the gear assembly is engaged with another gear 22 in the transmission housing 1, the gear 22 rotates clockwise (direction B) in the figure, the gear 21 rotates counterclockwise (direction A) in the figure, the elastic member 4 pushes the pressing rod 31 to enable the pressing rod 31 to rotate around the connecting part of the pressing rod 31 and the transmission housing 1 for a certain angle, one end of the pressing rod 31, which is in contact with the cam 5, applies a torque to the cam 5 to enable the cam 5 to rotate for a certain angle in the clockwise direction, the cam 5 is connected with the gear 21, then the cam 5 applies a torque to the gear 21, after the gear 21 obtains the torque in the clockwise direction, the working surface (lower tooth surface) of the teeth of the gear 21 is attached to the working surface (upper tooth surface) of the teeth of the gear 22 more tightly, when the transmission vibrates, the teeth of the gear 21 are not separated from the teeth of the gear 22 easily, and the impact between the teeth of the gear 21 and the teeth of the gear 22 is reduced, thereby effectively reducing rattle noise in the transmission.
It should be noted that the elastic member 4 can be any elastic component, such as a spring plate, a spring, etc., and preferably, the elastic member 4 is a telescopic spring, because the telescopic spring has good telescopic performance and low cost, and the magnitude of the torque applied to the gear 21 by the pressing rod 3 can be changed by replacing springs with different elastic coefficients.
Since the transmission is in a stable working state and generates less vibration to substantially prevent the gear from being bumped after the automobile runs at a high speed, in order to improve the power transmission efficiency of the gear, referring to fig. 3 to 6, in a preferred embodiment, the gear assembly further includes: the connecting piece 6, the locking pin 71 and the driving device; the connecting piece 6 is fixedly connected with the cam 5, the cam 5 is connected with the gear 21 through the connecting piece 6, the gear 21 is sleeved on the connecting piece 6, a pin groove 73 is formed in the gear 21, a locking groove 72 is formed in the connecting piece 6, an opening of the pin groove 73 is opposite to an opening of the locking groove 72, the locking pin 71 is located in the pin groove 73, and the driving device is connected with the locking pin 71.
When the automobile runs at a low speed, the driving device drives the locking pin 71 to extend out of the pin slot 73 and extend into the locking slot 72, so that the cam 5 is connected with the gear 21, and the cam 5 can drive the gear 21 to rotate; when the automobile runs at a high speed, the driving device drives the locking pin 71 to leave the locking groove 72 and return to the pin groove 73, and at this time, the cam 5 can rotate relative to the gear 21, that is, the cam 5 does not drive the gear 21 to rotate when rotating, so that the bonding force between the working surface of the teeth of the gear 21 and the working surface of the teeth of the gear 22 is reduced, and the power transmission efficiency between the gear 21 and the gear 22 is improved. It is worth mentioning that in order to simplify the assembly process, it is preferred that the cam 5 and the connecting piece 6 are of one-piece construction.
The driving device in the gear assembly may be a motor, at this time, a lead screw is connected to an output shaft of the motor, and a threaded hole matched with the lead screw is formed in the locking pin 71, for example, when the motor rotates forwards, the output shaft of the motor drives the lead screw to rotate, so that the locking pin 71 extends into the locking groove 72, and when the motor rotates backwards, the output shaft of the motor drives the lead screw to rotate backwards, so that the locking pin 71 leaves the locking groove 72 and returns to the pin groove 73. However, the electrical wiring required to energize the motor takes up a lot of space in the transmission. Therefore, referring to fig. 4, in a preferred embodiment, the driving device is a locking spring 8, the locking spring 8 is disposed in a pin slot 73, and when the locking spring 8 is in an initial state, a locking pin 71 extends into a locking slot 72 to connect the cam 5 and the gear 21. When the automobile runs at a high speed, the rotation speed of the gear 21 is increased, the centrifugal force applied to the locking spring 8 and the locking pin 71 is increased, the locking pin 71 is separated from the locking groove 72 under the action of the centrifugal force and returns to the pin groove 73, and the locking spring 8 is compressed under the action of the centrifugal force of the locking spring 8 and the thrust force of the locking pin 7; when the automobile runs at a low speed again, the centrifugal force applied to the locking spring 8 and the locking pin 71 is reduced, the locking spring 8 is extended under the action of elastic force, and pushes the locking pin 71, so that the locking pin 71 extends into the locking groove 72, and the cam 5 is connected with the gear 21. It should be noted that the lock spring 8 and the lock pin 71 having different parameters may be selected according to the maximum rotation speed of the gear 21 at the time of the knocking noise.
In the gear assembly, one end of the pressure rod 31 is always in contact with the profile surface of the cam 5, sliding friction is generated between the pressure rod 31 and the profile surface of the cam 5 during the rotation of the cam 5, and in order to reduce the friction force between the pressure rod 31 and the profile surface of the cam 5, the surface of the pressure rod 31 in contact with the profile surface of the cam 5 is preferably a smooth curved surface, so that the sliding friction force between the pressure rod 31 and the profile surface of the cam 5 is reduced. In order to further reduce the friction force between the pressing rod 31 and the profile surface of the cam 5, referring to fig. 2, in a preferred embodiment, a cylindrical roller 32 is mounted at one end of the pressing rod 31 contacting the profile surface of the cam 5 in a rolling manner, the pressing rod 31 contacts the profile surface of the cam 5 through the cylindrical roller 32, the surface of the cylindrical roller 32 contacting the profile surface of the cam 5 is a curved surface, and when the cam 5 rotates, the cylindrical roller 32 is driven by the cam 5 to rotate, so that the sliding friction between the pressing rod 31 and the profile surface of the cam 5 is converted into rolling friction through the cylindrical roller 32, thereby further reducing the friction force between the pressing rod 31 and the profile surface of the cam 5, reducing the abrasion between the pressing rod 31 and the profile surface of the cam 5, and reducing the noise generated by the friction between the pressing rod 31 and the profile surface of the cam 5.
Example two
As shown in fig. 2, a second embodiment of the present invention provides a transmission, including: the gear assembly comprises a transmission housing 1 with a cavity, and a gear assembly arranged in the cavity and provided with the cavity as in the first embodiment, wherein a pressure rod 31 of the gear assembly is hinged with the transmission housing 1, and two ends of an elastic part 4 of the gear assembly are respectively connected with the transmission housing 1 and the pressure rod 3. Due to the arrangement of the gear assembly in the transmission, as shown in fig. 2, when the gear 21 in the gear assembly is meshed with another gear 22, the working surfaces of the teeth of the gear 21 and the working surfaces of the teeth of the gear 22 are attached more closely, so that the impact between the teeth of the gear 21 and the teeth of the gear 22 caused by the vibration of the transmission is reduced, and the knocking noise of the transmission is effectively reduced.
EXAMPLE III
The third embodiment of the present invention provides a car, wherein a transmission is provided in the car as the second embodiment. Because the gear assembly is arranged in the transmission of the automobile, as shown in fig. 2, when the gear 21 in the gear assembly is meshed with another gear 22, the working surfaces of the teeth of the gear 21 and the working surfaces of the teeth of the gear 22 are attached more closely, so that the impact between the teeth of the gear 21 and the teeth of the gear 22 caused by the vibration of the transmission is reduced, and the knocking noise of the transmission is effectively reduced.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A gear assembly, comprising: the gear (21) is arranged in a cavity of the transmission shell (1), the cam (5) is connected with the gear (21), the pressure lever (31) is hinged with the transmission shell (1), and the elastic piece (4) is respectively connected with the pressure lever (31) and the transmission shell (1); wherein,
one end of the pressure lever (31) is in contact with the profile surface of the cam (5), and the elastic piece (4) pushes the gear (21) to the direction opposite to the rotation direction of the gear (21) through the pressure lever (31).
2. The gear assembly according to claim 1, further comprising: drive arrangement, locking round pin (71) and with cam (5) fixed connection's connecting piece (6), cam (5) pass through connecting piece (6) with gear (21) are connected, gear (21) suit is in on connecting piece (6), be provided with cotter way (73) in gear (21), connecting piece (6) with the region that cotter way (73) correspond is provided with locking groove (72), locking round pin (71) are located in cotter way (73), drive arrangement with locking round pin (71) link to each other, locking round pin (71) are in stretch out under drive arrangement's the drive cotter way (73), and stretch into in locking groove (72), so that cam (5) with gear (21) link to each other.
3. A gear assembly according to claim 2, wherein the cam (5) and the connecting member (6) are of a unitary construction.
4. A gear assembly according to claim 2, wherein the drive means is a locking spring (8), the locking spring (8) being arranged in the pin slot (73), the locking pin (71) extending into the locking slot (72) when the locking spring (8) is in the initial state.
5. The gear assembly according to claim 1, wherein the surface of the strut (31) in contact with the contoured surface of the cam (5) is a smooth curved surface.
6. A gear assembly according to claim 1, wherein one end of the pressure lever (31) is roll-mounted with a cylindrical roller (32), and the pressure lever (31) is in contact with the profile surface of the cam (5) through the cylindrical roller (32).
7. A gear assembly according to claim 1, wherein the resilient member (4) is a telescopic spring.
8. Transmission, characterized in that it comprises a transmission housing (1) having a cavity, and a gear assembly according to any one of claims 1 to 7 arranged in said cavity, the strut (31) of which is articulated with the transmission housing (1), the elastic element (4) of which is connected with the strut (31) and with the transmission housing (1), respectively.
9. A motor vehicle, characterized in that a transmission according to claim 8 is provided in the motor vehicle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520184121.6U CN204572998U (en) | 2015-03-30 | 2015-03-30 | A kind of gear assembly, speed changer and automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520184121.6U CN204572998U (en) | 2015-03-30 | 2015-03-30 | A kind of gear assembly, speed changer and automobile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204572998U true CN204572998U (en) | 2015-08-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520184121.6U Expired - Fee Related CN204572998U (en) | 2015-03-30 | 2015-03-30 | A kind of gear assembly, speed changer and automobile |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204572998U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106337923A (en) * | 2016-08-31 | 2017-01-18 | 青岛大学 | Cam gear assembly, slider gear assembly and transmission mechanism composed of cam gear assembly and slider gear assembly |
-
2015
- 2015-03-30 CN CN201520184121.6U patent/CN204572998U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106337923A (en) * | 2016-08-31 | 2017-01-18 | 青岛大学 | Cam gear assembly, slider gear assembly and transmission mechanism composed of cam gear assembly and slider gear assembly |
| CN106337923B (en) * | 2016-08-31 | 2019-04-09 | 青岛大学 | The transmission mechanism of cam and rack unit, sliding block gear assembly and its composition |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150819 |