Adjustable easy-to-center transmission chassis dynamometer and dynamometer method

Abstract

The application discloses an adjustable easy-centering transmission chassis dynamometer device and a dynamometer method, which comprise a base, a dynamometer hub, a sinking space, a sliding groove, an axial translation support and front and rear adjusting supports; a pair of the front and rear adjusting supports in the front and rear directions are provided with an adjusting interval on the dynamometer hub; a plurality of liftable support seats are further arranged on the middle part of the base; auxiliary positioning brackets are respectively arranged on the outer sides of the axial translation supports; the auxiliary positioning brackets are arranged in positive correspondence with the central axis of the dynamometer hub; and a centering sensor is arranged on the auxiliary positioning bracket. The adjustable easy-centering transmission chassis dynamometer device is convenient for the centering adjustment between a pair of wheels of a heavy-load vehicle, has high centering accuracy and high flexibility.

Description

Technical Field

[0001] This invention relates to the field of chassis dynamometer technology, specifically to an adjustable and easily centered transmission chassis dynamometer device and dynamometer method. Background Technology

[0002] The chassis dynamometer is an indoor bench test equipment used to test the performance of automobiles and engineering vehicles, including power, emissions under multiple operating conditions, fuel efficiency, and pure electric range. The chassis dynamometer uses rollers to simulate a road surface, calculates road simulation equations, and uses a loading device to simulate various operating conditions of automobiles and engineering vehicles. It can be used for loading and debugging of automobiles and engineering vehicles, and diagnosing faults that occur under load conditions. The chassis dynamometer is easy to use, reliable, and unaffected by external conditions. Without disassembling the vehicle, it can accurately and quickly test the performance of various systems and components. The chassis dynamometer can be used for both scientific automotive testing and maintenance inspection.

[0003] When testing is required, the car is driven directly onto the dynamometer. For the accuracy of the test, the car needs to be parked in the middle of the testing structure, and the tires of the vehicle to be tested need to be aligned. This requires starting the vehicle multiple times for adjustment, which increases the complexity of the test and reduces efficiency. Moreover, it is quite difficult to adjust the tire position by moving the vehicle itself for alignment.

[0004] For heavy-duty and large vehicles, the inertia is large and the tire size is also large, making it difficult to align the tires by relying on the vehicle's own operation. Using external devices to assist in alignment is necessary, but general structures cannot support the weight of the vehicle. Simple transmission chassis dynamometers cannot meet the requirements, and special support components need to be designed. There is an urgent need for a transmission chassis dynamometer that can bear a large load, is easy to adjust, and can be aligned. Summary of the Invention

[0005] The purpose of this invention is to address the problems existing in the prior art by providing an adjustable and easily aligned transmission chassis dynamometer device and dynamometer method.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] An adjustable and easily centered transmission chassis dynamometer device includes a base. A pair of grooves are provided in the width direction of the center of the base. A dynamometer hub is installed in the grooves. Sinking spaces are provided on the base in the front-rear direction of the dynamometer hub. Multiple sliding grooves are provided in the sinking spaces, and the arrangement direction of the sliding grooves is parallel to the axial direction of the dynamometer hub. Multiple axial translation supports are provided above the sliding grooves. The multiple axial translation supports are arranged in pairs above the sinking spaces in the front-rear direction. The front and rear ends of the axial translation supports are located above the base. One end of each axial translation support has a first ramp, and the other end is positioned close to the dynamometer hub. A horizontal slide rail is also provided above the axial translation support, and a front-rear adjustment support is provided above the horizontal slide rail.

[0008] One end of the front and rear adjustable support is provided with a second ramp, and the other end is set towards the dynamometer hub and higher than the dynamometer hub. The slope of the second ramp is the same as the slope of the first ramp and is set accordingly. A pair of front and rear adjustable supports in the front and rear direction are provided with an adjustable distance on the dynamometer hub.

[0009] The base located in the middle is also provided with several liftable support seats, which are arranged between a pair of axial translation supports in the width direction; the base located outside the axial translation supports is provided with auxiliary positioning brackets, which are arranged in direct correspondence with the central axis of the dynamometer hub, and the auxiliary positioning brackets are provided with centering sensors.

[0010] This adjustable and easily aligned transmission chassis dynamometer, through the axial translation support and the front and rear adjustment supports, facilitates the alignment adjustment between a pair of wheels of a heavy-duty vehicle, and has high alignment accuracy. It can accurately and conveniently connect with the dynamometer hub. It also has high overall flexibility and can adapt to various vehicle models with different wheelbases and track widths. It can perform dynamometer tests on both front-wheel drive and rear-wheel drive vehicles.

[0011] The combination of the axial translation support and the front and rear adjustment support also has the functions of overall adjustment and fine adjustment. It can drive the whole vehicle to move, and also allow each wheel to be adjusted independently, which is conducive to the accurate alignment of a pair of wheels.

[0012] The adjustable spacing of the pair of front and rear adjustable supports on the dynamometer hub allows the wheels to engage and support each other, suspending them above the hub without contacting it. Micro-adjustments of the supports ensure the wheels are aligned before contacting the hub. This alignment method avoids driving the vehicle directly above the hub for alignment, reducing the difficulty of alignment and improving accuracy and controllability.

[0013] The first and second ramps are designed to allow the wheels to move onto the front and rear adjustable supports on their own. During the adjustment process, the first and second ramps can be separated for fine-tuning in the front and rear directions. After the test is completed, the staggered first and second ramps can be brought together to allow the vehicle to be removed from the production line.

[0014] The axial translation support can adjust the spacing between side-by-side axial translation supports according to the wheel spacing, and can also be moved out from under the vehicle after alignment so that the vehicle can be used for dynamometer testing.

[0015] The aforementioned adjustable support seats can lift or support the vehicle to assist in vehicle centering adjustment. They are also used for docking the vehicle's wheels with the dynamometer hub. For example, after the wheels are aligned, the adjustable support seats can temporarily support the vehicle, allowing the wheels to leave the front and rear adjustable supports. The axial translation support is then controlled to move outward synchronously, clearing the dynamometer testing area in the middle. After the front and rear adjustable supports move away, the adjustable support seats descend, allowing the tires to fall onto the dynamometer hub. The adjustable support seats continue to descend, allowing the dynamometer hub to support the tires on its own. Then, the dynamometer test can be conducted according to the testing requirements.

[0016] Furthermore, the sunken space is also equipped with a plurality of first drive motors, which are used to connect to and drive the axial translation support, and each axial translation support is equipped with at least one first drive motor.

[0017] The first drive motor can drive each of the axial translation supports to move independently, facilitating their individual adjustment. Installing the first drive motor and other components such as the sliding groove within the sunken space does not occupy space above the base, nor does it affect the movement of the axial translation supports in and out.

[0018] Furthermore, the slide is a T-shaped slide, and a T-shaped slider is provided below the axial translation support. The T-shaped slider is slidably disposed in the T-shaped slide. This slide structure is simple and has a stable sliding effect. The height of the T-shaped slide does not exceed the sunken space, and the two ends of the axial translation support are slidably supported on the base.

[0019] Furthermore, the axial translation support has a planar area, on which a pair of horizontal slide rails and a second drive motor are provided. The second drive motor is located between the pair of horizontal slide rails and is connected to and drives the front and rear adjustment support.

[0020] The planar area facilitates the arrangement of horizontal slide rails, motors, and other components, allowing the front and rear adjustable supports to slide relative to the axial translational supports.

[0021] Furthermore, a stepped structure is provided between the planar area and the first slope, and a locking structure adapted to the stepped structure is provided below the second slope to form a limit and ensure that the second slope and the first slope are connected without any height difference, that is, the two slopes are basically smoothly connected without large seams.

[0022] Furthermore, the front and rear adjustable supports include a sliding base plate disposed above the horizontal slide rail, a second ramp disposed on the sliding base plate, and a support platform engaging with the second ramp. Multiple side support plates are disposed between the second ramp and the sliding base plate, and multiple support uprights are disposed between the support platform and the sliding base plate. Inclined ribs are disposed between the support uprights and the support platform. The front and rear adjustable supports are each provided with an anti-slip structure and a side protection structure, which on the one hand ensures that the upward-moving tire does not slip, and on the other hand limits the movement from the side to prevent the tire from falling off or exceeding the limit range.

[0023] The front and rear adjustable supports with this structure are relatively simple in structure, have strong support capacity, and are relatively light in weight, reducing the power output burden of sliding.

[0024] Furthermore, the support platform is also equipped with an adjustable anti-reverse limiting flap, which is rotatably embedded in an opening in the support platform. A limiting plate is located below the anti-reverse limiting flap, connected to one side of the support column. A spring is provided between one end of the anti-reverse limiting flap and the limiting plate. The anti-reverse limiting flap can be raised manually, automatically, or electrically. After the vehicle's front wheels are on the support platform, the other part remains on the horizontal plane, forming a tilted vehicle structure. After the tires have passed, the support platform can reverse-limit the tires when pulling them.

[0025] Furthermore, there are at least four liftable support seats, with two symmetrically arranged on each side. The liftable support seats are raised and lowered by hydraulic control and have a strong load-bearing capacity.

[0026] Furthermore, the auxiliary positioning bracket is a height-adjustable bracket, which facilitates adjustment of its monitoring height. The height position of the centering sensor can be determined by coordinate point calculation. The centering sensor is provided on the side of the auxiliary positioning bracket facing the wheel hub to be measured. The centering sensor is a laser positioning sensor.

[0027] Furthermore, the base is provided with several tension piles on its periphery, and the tension piles are connected to cables. The cables are connected to and fix the vehicle under test. During the dynamometer test, these cables can maintain the position of the vehicle.

[0028] A dynamometer measurement method for an adjustable and easily aligned transmission chassis dynamometer, the dynamometer method comprising the following arrangement:

[0029] (1) Control the front and rear adjustment supports to align the second ramp with the first ramp, adjust the axial translation support according to the wheel track of the vehicle to be tested, and adjust the auxiliary positioning bracket according to the tire diameter of the vehicle to be tested and the size of the dynamometer hub so that the target point coordinates of the centering sensor are at the tire radius height directly above the dynamometer hub, i.e., at the center point of the tire.

[0030] (2) The vehicle under test travels along the first slope and the second slope to the support platform of the front and rear adjustable supports;

[0031] (3) When the vehicle under test is idling, control the front and rear adjustment supports to make the second slope move away from the first slope and reduce the adjustment distance;

[0032] (4) The vehicle under test continues to move forward to the adjustment distance, and the tires of the vehicle under test are engaged and supported at the adjustment distance without contacting the dynamometer hub;

[0033] (5) Fine-tune the axial translation support and the front and rear adjustment support so that the tire slowly descends until it is tangent to the top of the dynamometer hub. Based on the target point coordinate position of the centering sensor, determine whether the tire center point coincides with the target point coordinate. If they coincide, continue to the next step. If they do not coincide, continue to fine-tune the front and rear adjustment support.

[0034] (6) Control the liftable support to lift the vehicle under test, control the front and rear adjustable supports to separate the tire from the support platform, and translate the axial translation support to move it horizontally out from under the vehicle under test.

[0035] (7) Slowly lower the tire until it lands on the dynamometer hub. Use tension piles and cables to fix the body of the vehicle under test. Remove the support force of the liftable support seat. Use the centering sensor to re-measure the tire centering. Once there is no deviation, the dynamometer test can begin.

[0036] Compared with the prior art, the beneficial effects of the present invention are: 1. The adjustable and easily aligned transmission chassis dynamometer, through the setting of the axial translation support and the front and rear adjustment supports, facilitates the alignment adjustment between a pair of wheels of a heavy-duty vehicle, and has high alignment accuracy, enabling accurate and convenient docking with the dynamometer hub; it also has high overall flexibility, adapting to various vehicle models with different wheel spacings, and can perform dynamometer testing on both front-wheel drive and rear-wheel drive vehicles; 2. The combination of the axial translation support and the front and rear adjustment supports also has the functions of overall adjustment and fine adjustment, enabling the entire vehicle to move, and allowing each wheel to be independently fine-tuned, which is beneficial for accurate alignment of a pair of wheels; 3. The pair of front and rear adjustment supports The adjustable spacing set on the dynamometer hub can engage and support the wheel, allowing the wheel to suspend above the dynamometer hub without contacting it. The wheel can then be aligned and contacted with the dynamometer hub via fine adjustments of the front and rear adjustable supports. 4. The first and second ramps facilitate the wheel's self-movement onto the front and rear adjustable supports. During adjustment, the first and second ramps can separate for fine adjustments in the front and rear directions. After testing, the staggered first and second ramps can be brought together to allow the vehicle to leave the test line. 5. The several liftable support seats can lift or support the vehicle to assist in centering adjustments and also facilitate wheel docking with the dynamometer hub. Attached Figure Description

[0037] Figure 1 This is a three-dimensional structural schematic diagram of an adjustable and easily aligned transmission chassis dynamometer according to the present invention.

[0038] Figure 2 This is a top view schematic diagram of an adjustable and easily centered transmission chassis dynamometer device according to the present invention.

[0039] Figure 3 This is a partial structural schematic diagram of an adjustable and easily aligned transmission chassis dynamometer according to the present invention.

[0040] Figure 4 This is a schematic diagram of the centering sensor arrangement for an adjustable and easily centered transmission chassis dynamometer device according to the present invention.

[0041] Figure 5 This is a schematic diagram of another support platform of the present invention. Figure 1 ;

[0042] Figure 6 This is a schematic diagram of another support platform of the present invention. Figure 2 ;

[0043] In the diagram: 1. Base; 2. Dynamometer hub; 3. Sinking space; 4. Slide groove; 5. Axial translation support; 6. First ramp; 7. Horizontal slide rail; 8. Front and rear adjustable support; 801. Sliding base plate; 802. Support platform; 803. Side support plate; 804. Support pole; 805. Inclined rib plate; 9. Second ramp; 10. Liftable support seat; 11. First drive motor; 12. Second drive motor; 13. Auxiliary positioning bracket; 14. Centering sensor; 15. Anti-reverse limit flap; 16. Limit plate; 17. Spring. Detailed Implementation

[0044] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] In the description of this invention, it should be noted that the terms "middle," "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] Example 1:

[0047] like Figures 1-4 As shown, an adjustable and easily centered transmission chassis dynamometer device includes a base 1. A pair of grooves are provided in the width direction of the center of the base 1, and an adjustable dynamometer hub 2 is installed within the grooves. Below the base 1 is a pit space for setting up equipment to drive and support the dynamometer hub 2. Sinking spaces 3 are respectively provided on the base 1 in the front-rear direction of the dynamometer hub 2. Multiple sliding grooves 4 are provided within the sinking spaces 3, and the arrangement direction of the sliding grooves 4 is parallel to the axial direction of the dynamometer hub 2. Multiple axial translation supports 5 are provided above the sliding grooves 4, and the multiple axial translation supports 5 are arranged in pairs above the sinking spaces 3 in the front-rear direction. The front and rear ends of the axial translation supports 5 are respectively located above the base 1. One end of the axial translation support 5 is provided with a first ramp 6, and the other end is located close to the dynamometer hub 2. A horizontal slide rail 7 is also provided above the axial translation support 5, and a front-rear adjustable support 8 is provided above the horizontal slide rail 7.

[0048] One end of the front and rear adjustable support 8 is provided with a second ramp 9, and the other end is set towards the dynamometer hub and higher than the dynamometer hub 2. The slope of the second ramp 9 is the same as the slope of the first ramp 6 and is set accordingly. A pair of front and rear adjustable supports 8 in the front and rear direction are provided with an adjustable distance on the dynamometer hub 2.

[0049] The base 1 located in the middle is also provided with several liftable support seats 10, which are arranged between a pair of axial translation supports 5 in the width direction; the base 1 located outside the axial translation supports 5 is provided with auxiliary positioning brackets 13, which are arranged in a vertical plane corresponding to the central axis of the dynamometer hub 2, and the auxiliary positioning brackets 13 are provided with centering sensors 14.

[0050] This adjustable and easily aligned transmission chassis dynamometer, through the axial translation support 5 and the front and rear adjustment supports 8, facilitates the alignment adjustment between a pair of wheels of a heavy-duty vehicle, and has high alignment accuracy. It can accurately and conveniently connect with the dynamometer hub. It also has high overall flexibility and can adapt to various vehicle models with different wheelbases and track widths. It can perform dynamometer tests on both front-wheel drive and rear-wheel drive vehicles.

[0051] The combination of the axial translation support 5 and the front and rear adjustment support 8 also has the functions of overall adjustment and fine adjustment. It can drive the whole vehicle to move, and also allow each wheel to be adjusted independently, which is conducive to the accurate alignment of a pair of wheels.

[0052] The adjustable spacing of the pair of front and rear adjustable supports 8 on the dynamometer hub 2 allows the wheels to engage and support each other, suspending them above the hub without contacting it. Micro-adjustments of the front and rear adjustable supports 8 ensure the wheels are aligned before contacting the hub. This alignment method avoids driving the vehicle directly above the dynamometer hub for alignment, reducing the difficulty of alignment and improving accuracy and controllability.

[0053] The first ramp 6 and the second ramp 9 are designed to allow the wheels to drive onto the front and rear adjustable supports 8 on their own. During the adjustment process, the first ramp 6 and the second ramp 9 can be separated to allow for fine-tuning in the front and rear directions. After the test is completed, the staggered first ramp 6 and the second ramp 9 can be brought together to allow the vehicle to be removed from the production line.

[0054] The axial translation support 5 can adjust the spacing between the side-by-side axial translation supports 5 according to the size of the wheel spacing, and can also be moved out from under the vehicle after alignment so that the vehicle can be used for dynamometer testing.

[0055] The various adjustable support seats 10 can lift or support the vehicle to assist in vehicle centering adjustment. They are also used for docking the vehicle's wheels with the dynamometer hub. For example, after the wheels are aligned, the adjustable support seats 10 can temporarily support the vehicle, and the wheels leave the front and rear adjustment supports 8. The axial translation support 5 is controlled to move outward synchronously to clear the dynamometer testing area in the middle. After the axial translation support 5 moves away, the adjustable support seats 10 descend, allowing the tire to fall onto the dynamometer hub 2. The adjustable support seats 10 continue to descend, allowing the dynamometer hub to support the tire itself. Then, the dynamometer test can be carried out according to the test requirements.

[0056] Furthermore, the sunken space 3 is also provided with a plurality of first drive motors 11, which are used to connect to and drive the axial translation support 5, and each axial translation support 5 is equipped with at least one first drive motor 11.

[0057] The first drive motor 11 can drive the axial translation supports to move independently, facilitating their individual adjustment. The first drive motor 11 and other components such as the sliding groove are installed within the sunken space 3, without occupying space above the base 1 or affecting the movement of the axial translation supports 5 in and out.

[0058] Furthermore, the slide 4 is a T-shaped slide, and a T-shaped slider is provided below the axial translation support 5. The T-shaped slider is slidably disposed in the T-shaped slide. This slide structure is simple and has a stable sliding effect. The height of the T-shaped slide does not exceed the sunken space 3, and the two ends of the axial translation support 5 are slidably supported on the base 1.

[0059] Furthermore, the axial translation support 5 is provided with a planar area, on which a pair of horizontal slide rails 7 and a second drive motor 12 are provided. The second drive motor 12 is located between the pair of horizontal slide rails 7 and is connected to and drives the front and rear adjustment support 8.

[0060] The planar area is designed to facilitate the arrangement of horizontal slide rails, motors and other components, and allows the front and rear adjustable supports 8 to slide relative to the axial translation support 5.

[0061] Furthermore, a stepped structure is provided between the planar area and the first slope 6, and a locking structure adapted to the stepped structure is provided below the second slope 9, which can form a limit and make the second slope 9 and the first slope 6 connect without any height difference, that is, the two slopes are basically smoothly connected without large seams.

[0062] Furthermore, the front and rear adjustable supports 8 include a sliding base plate 801 disposed above the horizontal slide rail 7. The sliding base plate 801 is provided with a second ramp 9 and a support platform 802 connected to the second ramp 9. Multiple side support plates 803 are provided between the second ramp 9 and the sliding base plate 801. Multiple support rods 804 are provided between the support platform 802 and the sliding base plate 801. Inclined ribs 805 are provided between the support rods 804 and the support platform 802. The front and rear adjustable supports 8 are provided with anti-slip structures and side protection structures above them. On the one hand, they can ensure that the upward-moving tires do not slip. On the other hand, they can limit the tires from falling off or exceeding the limit range from the side.

[0063] The front and rear adjustable supports 8 with this structure are relatively simple, possessing both strong support capacity and light overall weight, thus reducing the power output burden during sliding. The pair of support platforms 802 in the front-rear direction can form a accommodating space near the dynamometer hub 2.

[0064] Furthermore, there are four liftable support seats 10, with two symmetrically arranged on each side. The liftable support seats 10 are raised and lowered by hydraulic control and have a strong load-bearing capacity.

[0065] Furthermore, the auxiliary positioning bracket 13 is a height-adjustable bracket, which facilitates the adjustment of its monitoring height. The height position of the centering sensor can be determined by coordinate point calculation. The centering sensor 14 is provided on the side of the auxiliary positioning bracket 13 facing the wheel hub (tire) to be tested. The centering sensor 14 is a laser positioning sensor.

[0066] Furthermore, the base 1 is also provided with several tension piles on its periphery. The tension piles are connected to cables, which are connected to and fix the vehicle to be tested. During the dynamometer test, these cables can maintain the position of the vehicle.

[0067] A dynamometer measurement method for an adjustable and easily aligned transmission chassis dynamometer, the dynamometer method comprising the following arrangement:

[0068] (1) Control the front and rear adjustment supports 8 to align the second ramp 9 and the first ramp 6, and make slight adjustments to the axial translation support 5 according to the wheel track of the vehicle under test; adjust the auxiliary positioning bracket 13 according to the tire diameter of the vehicle under test and the size of the dynamometer hub so that the target point coordinates of the centering sensor 14 are at the tire radius height directly above the dynamometer hub, which is the tire center point at the expected tire support position.

[0069] (2) The vehicle under test travels along the first slope 6 and the second slope 9 to the support platform 802 of the front and rear adjustable supports;

[0070] (3) The vehicle under test is idle, in neutral, and the brake is released. The front and rear adjustment supports 8 are controlled to make the second ramp 9 leave the first ramp 6. The front and rear adjustment supports 8 will pull the vehicle to move a certain distance. The purpose is to reduce the adjustment distance between the ends of the adjacent support platforms 802. This adjustment distance may initially be greater than the tire outer diameter, which will cause the tire to fall on the dynamometer hub without being aligned.

[0071] (4) After the second ramp 9 and the first ramp 6 separate and the adjustment distance is appropriate, the vehicle under test continues to move forward to the adjustment distance. The tires of the vehicle under test are locked and supported at the adjustment distance and do not contact the dynamometer hub 2.

[0072] (5) Make fine adjustments to the axial translation support 5 and the front and rear adjustment support 8 so that the tire slowly descends until it is tangent to the top of the dynamometer hub 2. Based on the target point coordinate position of the centering sensor, determine whether the tire center point coincides with the target point coordinate. If they coincide, continue to the next step. If they do not coincide, continue to make fine adjustments to the front and rear adjustment support 8.

[0073] (6) Control the liftable support 10 to lift the vehicle under test, control the front and rear adjustable support 8 to separate the tire from the support platform 802, and translate the axial translation support 5 to move it horizontally out from under the vehicle under test.

[0074] (7) Slowly lower the tire until it lands on the dynamometer hub 2. Use tension piles and cables to fix the body of the vehicle under test. Remove the support force of the liftable support seat. Use the centering sensor 14 to re-measure the tire centering. Once there is no deviation, the dynamometer test can begin.

[0075] The above method enables relatively accurate and rapid tire alignment of large, heavy-duty vehicles (trucks, tractors, box forklifts, etc.) and allows for dynamometer testing of the vehicles. This method makes efficient use of the space on the base, simplifies the adjustment structure, and allows alignment adjustment to be completed with a simple and reasonable support.

[0076] Example 2:

[0077] This embodiment provides another structure for the support platform.

[0078] like Figure 5 and Figure 6As shown, the support platform 802 is also equipped with an adjustable anti-reverse limiting flap 15. The anti-reverse limiting flap 15 is rotatably embedded in the opening of the support platform 802. A limiting plate 16 is provided below the anti-reverse limiting flap 15. The limiting plate 16 is connected to one side of the support column 804. A spring 17 is provided between one end of the anti-reverse limiting flap 15 and the limiting plate 16. The anti-reverse limiting flap 15 is rotatably connected by a rotating shaft and its lifting is controlled electrically by an electromagnetic valve. After the front wheel of the vehicle is on the support platform 802, the other part of it is still on the horizontal plane, forming a tilted structure of the vehicle body. After the tire passes, when the tire is pulled by the support platform 803, the anti-reverse limiting flap 15 can reverse the tire's movement. The limiting plate 16 can support the anti-reverse limiting flap 15 from below, keeping it in a tilted state. When the vehicle is off the production line, the anti-reverse limiting flap 15 retracts into the support platform 803 without affecting the movement of the vehicle.

[0079] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An adjustable and easily centered transmission chassis dynamometer, characterized in that, The device includes a base with a pair of grooves in the width direction at the center. A dynamometer hub is installed in the grooves. The base has recessed spaces in the front and rear directions of the dynamometer hub. Multiple sliding grooves are arranged within the recessed spaces, parallel to the axis of the dynamometer hub. Multiple axial translation supports are positioned above the sliding grooves, arranged in pairs above the recessed spaces in the front and rear directions. The front and rear ends of each axial translation support are located above the base. One end of each axial translation support has a first ramp, and the other end is positioned close to the dynamometer hub. A horizontal slide rail is also provided above the axial translation support, and a front-rear adjustment support is provided above the horizontal slide rail. One end of the front and rear adjustable support is provided with a second ramp, and the other end is set towards the dynamometer hub and higher than the dynamometer hub. The slope of the second ramp is the same as the slope of the first ramp and is set accordingly. A pair of front and rear adjustable supports in the front and rear direction are provided with an adjustable distance on the dynamometer hub. The base located in the middle is also provided with several liftable support seats, which are arranged between a pair of axial translational supports in the width direction; Auxiliary positioning brackets are respectively provided on the base located outside the axial translation support. The auxiliary positioning brackets are arranged in direct correspondence with the central axis of the dynamometer hub. A centering sensor is provided on the auxiliary positioning brackets.

2. The adjustable and easily aligned transmission chassis dynamometer device according to claim 1, characterized in that, The sunken space is also equipped with a plurality of first drive motors, which are used to connect to and drive the axial translation support, and each axial translation support is equipped with at least one first drive motor.

3. The adjustable and easily aligned transmission chassis dynamometer device according to claim 1, characterized in that, The slide is a T-shaped slide, and a T-shaped slider is provided below the axial translation support. The T-shaped slider is slidably disposed in the T-shaped slide. The height of the T-shaped slide does not exceed the recessed space, and the two ends of the axial translation support are slidably supported on the base.

4. The adjustable and easily aligned transmission chassis dynamometer according to claim 1, characterized in that, The axial translation support has a planar area, on which a pair of horizontal slide rails and a second drive motor are provided. The second drive motor is located between the pair of horizontal slide rails and is connected to and drives the front and rear adjustment support.

5. The adjustable and easily aligned transmission chassis dynamometer according to claim 4, characterized in that, A stepped structure is provided between the planar area and the first slope, and a locking structure adapted to the stepped structure is provided below the second slope so that the second slope and the first slope are connected without any height difference.

6. The adjustable and easily aligned transmission chassis dynamometer according to claim 1, characterized in that, The front and rear adjustable supports include a sliding base plate disposed above the horizontal slide rail, a second ramp disposed on the sliding base plate, and a support platform connected to the second ramp. Multiple side support plates are disposed between the second ramp and the sliding base plate, and multiple support columns are disposed between the support platform and the sliding base plate. Inclined ribs are disposed between the support columns and the support platform. Anti-slip structures and side protection structures are disposed above the front and rear adjustable supports.

7. The adjustable and easily aligned transmission chassis dynamometer according to claim 6, characterized in that, The support platform is also equipped with an adjustable anti-reverse limiting flap, which is rotatably embedded in the opening of the support platform. A limiting plate is provided below the anti-reverse limiting flap, which is connected to one side of the support column. A spring is provided between one end of the anti-reverse limiting flap and the limiting plate.

8. The adjustable and easily aligned transmission chassis dynamometer according to claim 1, characterized in that, The auxiliary positioning bracket is a height-adjustable bracket, and the centering sensor is provided on the side of the auxiliary positioning bracket facing the wheel hub to be tested. The centering sensor is a laser positioning sensor.

9. The adjustable and easily aligned transmission chassis dynamometer according to claim 1, characterized in that, The base is also provided with several tension piles on its periphery, and the tension piles are connected to tension cables, which are connected to and fix the vehicle to be tested.

10. A method for measuring the dynamometer of a transmission chassis having the adjustable and easily aligned dynamometer device according to any one of claims 1 to 9, characterized in that, The dynamometer method includes the following arrangement: (1) Control the front and rear adjustment supports to align the second ramp with the first ramp, adjust the axial translation support according to the wheel track of the vehicle to be tested, and adjust the auxiliary positioning bracket according to the tire diameter of the vehicle to be tested and the size of the dynamometer hub so that the target point coordinates of the centering sensor are at the tire radius height directly above the dynamometer hub. (2) The vehicle under test travels along the first slope and the second slope to the support platform of the front and rear adjustable supports; (3) When the vehicle under test is idling, control the front and rear adjustment supports to make the second slope move away from the first slope and reduce the adjustment distance; (4) The vehicle under test continues to move forward to the adjustment distance, and the tires of the vehicle under test are engaged and supported at the adjustment distance without contacting the dynamometer hub; (5) Fine-tune the axial translation support and the front and rear adjustment support so that the tire slowly descends until it is tangent to the top of the dynamometer hub. Based on the target point coordinate position of the centering sensor, determine whether the tire center point coincides with the target point coordinate. If they coincide, continue to the next step. If they do not coincide, continue to fine-tune the front and rear adjustment support. (6) Control the liftable support to lift the vehicle under test, control the front and rear adjustable supports to separate the tire from the support platform, and translate the axial translation support to move it horizontally out from under the vehicle under test. (7) Slowly lower the tire until it lands on the dynamometer hub. Use tension piles and cables to fix the body of the vehicle under test. Remove the support force of the liftable support seat. Use the centering sensor to re-measure the tire centering. Once there is no deviation, the dynamometer test can begin.

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