CN209756804U - Intermediate support secondary vibration damper for vehicle transmission shaft - Google Patents
Intermediate support secondary vibration damper for vehicle transmission shaft Download PDFInfo
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- CN209756804U CN209756804U CN201920293229.7U CN201920293229U CN209756804U CN 209756804 U CN209756804 U CN 209756804U CN 201920293229 U CN201920293229 U CN 201920293229U CN 209756804 U CN209756804 U CN 209756804U
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- transmission shaft
- rubber elastic
- rubber
- bullet pad
- pad
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Abstract
The utility model relates to a vehicle transmission shaft intermediate strut second grade vibration damper, including installing the rubber bullet pad system between frame crossbeam and U type support, rubber bullet pad system includes that the symmetry is installed in the last rubber bullet pad and the lower rubber bullet pad at both ends about the frame crossbeam, the top of going up the rubber bullet pad has last rubber bullet pad baffle through the bolt fastening, the bottom fixed mounting of lower rubber bullet pad has U type support baffle, the bottom and the U type support of U type support baffle are laminated mutually to fixed mounting is used for supporting the rubber circle of transmission shaft, rubber bullet pad system and the mutual series connection of rubber circle constitute vibration damper. The utility model discloses rational in infrastructure, simple to operate, can be in X, Y, Z to all can fault-tolerant, and the fitting surface of buckle and panel beating does not have special requirement, is applicable to the panel beating surface that the profile is complicated, need not to increase the buckle seat that corresponds on the panel beating, and the same single-stage buckle mounting means of mounting means.
Description
Technical Field
The utility model relates to a vibration damper, specific secondary vibration damper of automobile-used transmission shaft intermediate strut that says so belongs to automobile parts technical field.
Background
The transmission shaft of the commercial vehicle is a main excitation source causing vibration noise in the vehicle, and the middle support of the transmission shaft is a main device for attenuating the vibration of the transmission shaft, reducing the noise in the vehicle and improving the riding comfort.
The existing transmission shaft middle support consists of a single-row ball bearing, a rubber ring and a U-shaped support. As shown in figure 1, a frame cross beam 1 is connected with a U-shaped support 2 through bolts, a rubber ring 3 is fixed in the U-shaped support 2, a bearing 4 is vulcanized in the rubber ring 3, and the device is a typical primary damping system.
In order to achieve better vibration and noise reduction effects, the existing improvement direction of the transmission shaft middle support is mainly focused on the rigidity matching of the rubber ring. For example, in the research on the design of the transmission shaft modal analysis and the intermediate support stiffness of the heavy-duty car, which is published in the automotive technology (2014, 1 st: 7-11) by Chen et al, the CAE modal analysis method is applied to the stiffness matching design of the rubber ring, and the better vibration isolation effect can be realized by reducing the stiffness of the rubber ring.
However, when the rigidity of the rubber ring is designed to be lower, the radial runout of the transmission shaft is increased, vibration is increased, and reliability problems such as early deformation and tearing of the rubber ring 3 are caused. Therefore, the effect of vibration and noise reduction is limited by reducing the rigidity of the rubber ring 3.
In order to improve the vibration isolation rate of the transmission shaft intermediate support, realize ideal vibration and noise reduction effects and ensure the reliability and the working stability of the rubber ring 3, a transmission shaft intermediate support secondary vibration damper needs to be designed.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that, overcome prior art's shortcoming, provide a rational in infrastructure, simple to operate's automobile-used transmission shaft intermediate strut second grade vibration damper, can further improve the vibration isolation rate of intermediate strut system under the prerequisite that does not reduce rubber circle rigidity, realize obvious damping, noise reduction effect.
In order to solve the technical problem, the utility model provides an automobile-used transmission shaft intermediate strut second grade vibration damper, its characterized in that: including installing the rubber bullet pad system between frame crossbeam and U type support, as shown in figure 1, the rubber bullet pad system is installed in the last rubber bullet pad and the lower rubber bullet pad at frame crossbeam upper and lower both ends including the symmetry, the top of going up the rubber bullet pad is fixed with rubber bullet pad baffle through the bolt, the bottom fixed mounting of rubber bullet pad has U type support baffle down, the bottom and the U type support of U type support baffle laminate mutually to fixed mounting is used for supporting the rubber circle of transmission shaft, rubber bullet pad system and the mutual series connection of rubber circle constitute damping device, have further reduced the system rigidity of intermediate strut from this, have improved the vibration isolation rate of system.
Furthermore, the rubber elastic cushion systems are arranged in two groups and are symmetrically arranged between the frame cross beam and the U-shaped support, and the bottoms of the rubber elastic cushion systems are arranged at two end parts of the U-shaped support.
Furthermore, the rigidity of the lower rubber elastic pad and the rigidity of the upper rubber elastic pad correspond to the vibration excitation frequency of the transmission shaft at the common lowest vehicle speedω 1Natural frequency of suspended mass with intermediate supportω 2Taking the ratio as the constraint condition matchingω 1/ω 2And the rubber elastic pad is kept at the position of 2.5-5, so that the reliability of the rubber elastic pad is ensured.
Further, the thickness of the lower rubber elastic pad is 8mm, and the thickness of the upper rubber elastic pad is 12 mm; the static rigidity of the rubber elastic pad is 68N/mm.
Furthermore, the upper rubber elastic pad and the lower rubber elastic pad are fixed through locking bolts respectively, and the pretightening force of the bolts is equal to the load born by the middle support under the working condition of 3g of acceleration, so that the upper rubber elastic pad and the lower rubber elastic pad are always in a compression state.
Furthermore, the surface area of the upper rubber elastic cushion baffle is larger than that of the upper rubber elastic cushion, so that the problem of fatigue damage of the upper rubber elastic cushion 8 due to local large deformation is solved.
The utility model has the advantages that: the utility model provides a pair of multiple tooth buckle for moulding plastics visor, its is rational in infrastructure, simple to operate, can be X, Y, Z to all can be fault-tolerant, and the fitting surface of buckle and panel beating does not have special requirement, is applicable to the panel beating surface that the profile is complicated, need not to increase the buckle seat that corresponds on the panel beating, and the mounting means is with single-stage level buckle mounting means.
Drawings
FIG. 1 is a diagram of the specific installation positions of a frame cross beam and a U-shaped bracket.
Fig. 2 is a front view of a prior art intermediate support structure.
Fig. 3 is a schematic structural diagram of the present invention.
FIG. 4 is a graph comparing front and rear stiffness of improved mid-support.
FIG. 5 is a simulated comparison of mid-support modified front and rear underbody vibration.
Description of the drawings: 1-frame cross beam, 2-U-shaped bracket, 3-rubber ring, 4-bearing, 5-U-shaped bracket baffle, 6-lower rubber elastic pad, 7-upper rubber elastic pad baffle, 8-upper rubber elastic pad, 9-frame cross beam and 10-U-shaped bracket.
Detailed Description
The following describes in detail a specific embodiment of the present invention with reference to fig. 3. As shown in FIG. 3, the utility model provides a two-stage vibration damper of vehicle transmission shaft intermediate strut, the device is on the basis of the structure of FIG. 2, adds one set of rubber bullet pad system between frame cross beam 1 and U type support 2. The rubber elastic pad and the rubber ring 3 form a series connection vibration reduction system, and the series connection system can further reduce the system rigidity of the middle support on the premise of not changing the rigidity of the rubber ring 3, so that the vibration isolation and noise reduction capability of the system is obviously improved.
In the attached drawing 3, the rigidity design of the lower rubber elastic cushion 6 and the upper rubber elastic cushion 8 should be matched by taking the ratio of the excitation frequency ω 1 of the transmission shaft corresponding to the common lowest vehicle speed to the natural frequency ω 2 of the middle support suspension mass as a constraint condition, generally, ω 1/ω 2= 2.5-5, and the reliability of the rubber elastic cushion should be ensured.
FIG. 3 shows a middle supporting secondary vibration damper, namely, a set of rubber elastic cushion system is arranged between a frame beam and a U-shaped bracket and is divided into a left side and a right side, each side is provided with an upper rubber elastic cushion and a lower rubber elastic cushion (a lower rubber elastic cushion 6 and an upper rubber elastic cushion 8), the thickness of the lower rubber elastic cushion 6 is 8mm, and the thickness of the upper rubber elastic cushion 8 is 12 mm; the static rigidity of the rubber elastic pad is 68N/mm.
The surface area of the upper rubber elastic pad baffle 7 is larger than that of the upper rubber elastic pad 8 contacted with the upper rubber elastic pad baffle so as to prevent the upper rubber elastic pad 8 from generating fatigue failure problem due to local large deformation.
A U-shaped bracket baffle 5 is arranged between the U-shaped bracket 2 and the lower rubber elastic cushion 6 and used for fixing the rubber ring 3 to prevent the rubber ring 3 from moving up and down.
The upper rubber elastic pad and the lower rubber elastic pad 6 and 8 are fixed by locking bolts, the pretightening force of the bolts is equal to the load born by the middle support under the working condition of 3g acceleration, and the upper rubber elastic pad and the lower rubber elastic pad are ensured to be always in a compression state.
In addition to the above embodiments, the present invention may have other embodiments. All the technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope claimed by the present invention.
Claims (7)
1. The utility model provides an automobile-used transmission shaft intermediate strut second grade damping device which characterized in that: including installing the rubber bullet pad system between frame crossbeam and U type support, rubber bullet pad system installs the last rubber bullet pad and lower rubber bullet pad at both ends about the frame crossbeam including the symmetry, the top of going up the rubber bullet pad has last rubber bullet pad baffle through the bolt fastening, the bottom fixed mounting that lower rubber bullet filled up has U type support baffle, the bottom and the U type support of U type support baffle laminate mutually to fixed mounting is used for supporting the rubber circle of transmission shaft, rubber bullet pad system and the mutual series connection of rubber circle constitute damping device.
2. The intermediate support secondary vibration damping device for the vehicular transmission shaft according to claim 1, wherein: the rubber elastic cushion systems are arranged in two groups and are symmetrically arranged between the frame cross beam and the U-shaped support, and the bottom of the rubber elastic cushion systems are arranged at two end parts of the U-shaped support.
3. The intermediate support secondary vibration damping device for the vehicular transmission shaft according to claim 1, wherein: the rigidity of the lower rubber elastic pad and the rigidity of the upper rubber elastic pad correspond to the vibration excitation frequency of the transmission shaft at the lowest common vehicle speedω 1Natural frequency of suspended mass with intermediate supportω 2Taking the ratio as the constraint condition matchingω 1/ω 2=2.5～5。
4. The intermediate support secondary vibration damping device for the vehicular transmission shaft according to claim 1, wherein: the thickness of the lower rubber elastic pad is 8mm, and the thickness of the upper rubber elastic pad is 12 mm; the static rigidity of the rubber elastic pad is 68N/mm.
5. The intermediate support secondary vibration damping device for the vehicular transmission shaft according to claim 1, wherein: the upper rubber elastic pad and the lower rubber elastic pad are fixed through locking bolts respectively.
6. The intermediate support secondary vibration damping device for the vehicular transmission shaft according to claim 5, wherein: the pretightening force of the bolt is equal to the load born by the middle support under the working condition of 3g acceleration, so that the upper rubber elastic cushion and the lower rubber elastic cushion are always in a compression state.
7. The intermediate support secondary vibration damping device for the vehicular transmission shaft according to claim 1, wherein: the surface area of the upper rubber elastic cushion baffle is larger than that of the upper rubber elastic cushion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920293229.7U CN209756804U (en) | 2019-03-08 | 2019-03-08 | Intermediate support secondary vibration damper for vehicle transmission shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920293229.7U CN209756804U (en) | 2019-03-08 | 2019-03-08 | Intermediate support secondary vibration damper for vehicle transmission shaft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209756804U true CN209756804U (en) | 2019-12-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920293229.7U Active CN209756804U (en) | 2019-03-08 | 2019-03-08 | Intermediate support secondary vibration damper for vehicle transmission shaft |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209756804U (en) |
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2019
- 2019-03-08 CN CN201920293229.7U patent/CN209756804U/en active Active
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