A hydraulic dynamometer

Abstract

The utility model belongs to the technical field of engine detection equipment relates to a kind of hydraulic dynamometers, including box and main shaft, sealing element is arranged between the box and main shaft and make the closed water cavity of box interior, the driven impeller is sleeved on the main shaft, the inner wall of the box is provided with fixed impeller, the driven impeller and fixed impeller relatively rotate to agitate water cavity water flow and form load torque, the both ends of the box are detachably connected with bearing seat, the bearing seat is provided with the bearing of supporting main shaft rotation and the sealing ring assembly of sealing bearing cavity;Inner cavity adjusting mechanism is provided in the box, including screw rod, adjusting gear and adjusting cover shell, adjusting screw rod is driven by adjusting gear and has two opposite thread sections, adjusting cover shell is made of a pair of half annular shell, it covers and is respectively screwed on opposite thread sections outside driven impeller.The hydraulic dynamometer provided by the utility model is convenient to replace consumables and accurately adjust load torque.

Description

Technical Field

[0001] This utility model belongs to the technical field of engine testing equipment, and relates to a hydraulic dynamometer. Background Technology

[0002] To verify the operating status and safety performance of a car engine, various performance tests need to be performed on the engines before they leave the factory. The existing engine dynamometer platform connects the engine crankshaft to the existing dynamometer. By starting the engine and performing normal work, the power is transmitted to the dynamometer to measure the power output.

[0003] For example, Chinese utility model patent CN118670729A discloses an engine dynamometer platform, including a vertical frame. The engine to be tested is fixed on the left side wall of the vertical frame. A linkage bushing with a linkage insertion hole on the left end face is rotatably connected to the vertical frame. A synchronous bushing that can rotate synchronously is fitted on the right end of the crankshaft of the engine to be tested. The synchronous bushing is inserted into the linkage insertion hole of the linkage bushing, and the synchronous bushing and the linkage bushing can rotate synchronously in the circumferential direction and move relative to each other in the axial direction. The right end of the linkage bushing is in transmission cooperation with the input end of the dynamometer.

[0004] The aforementioned engine dynamometer platform requires the use of a hydraulic dynamometer. The existing hydraulic dynamometer is particularly cumbersome to maintain. The maintenance and replacement of bearings and seals require the removal of the entire main housing and the spindle, which is time-consuming, labor-intensive, and affects the experimental process, resulting in particularly high maintenance costs. In addition, the adjustment structure of the hydraulic dynamometer relies heavily on the water volume regulation of the inlet valve, which is not precise enough for adjusting the load torque. Utility Model Content

[0005] This invention addresses the shortcomings of existing technologies by providing a hydraulic dynamometer that allows for easier maintenance and replacement of consumables and more accurate adjustment of load torque.

[0006] To solve the above-mentioned technical problems, the objective of this utility model is achieved through the following technical solution: A hydraulic dynamometer includes a housing and a main shaft. A seal is provided between the housing and the main shaft to form a closed water cavity inside the housing. A driven impeller is mounted on the main shaft, and a fixed impeller is provided on the inner wall of the housing. The driven impeller and the fixed impeller rotate relative to each other to agitate the water flow in the water cavity and generate a load torque. Bearing seats are detachably connected to both ends of the housing. The bearing seats contain bearings that support the rotation of the main shaft and sealing ring assemblies that seal the bearing cavities. An internal cavity adjustment mechanism is provided inside the housing, including a screw, an adjusting gear, and an adjusting cover. The adjusting screw is driven by the adjusting gear and has two opposite threaded sections. The adjusting cover is composed of a pair of semi-annular shells that cover the driven impeller and are screwed onto the opposite threaded sections.

[0007] In the aforementioned hydraulic dynamometer, the driven impellers are arranged in pairs, and the fixed impellers are arranged in pairs.

[0008] In the aforementioned hydraulic dynamometer, connecting bosses are respectively provided on the outer walls of both ends of the housing, and the bearing seat is detachably connected to the outside of the connecting bosses. The outer end of the bearing seat is covered with a bearing cover plate. Preferably, the connecting boss is a circular annular platform adapted to the bearing seat or a fan-shaped annular platform with intervals.

[0009] In the aforementioned hydraulic dynamometer, the bearing housing and the connecting boss together form a cavity with a side opening, and an adjustable locking seal is provided in the cavity; furthermore, the fixing screw is provided with a tooling groove that can be adjusted from the side opening.

[0010] In the aforementioned hydraulic dynamometer, the fixed impeller extends outward to form a sealing cavity for installing a sealing element. The fixed plug is fitted onto the main shaft and screwed to the fixed impeller. The fixed plug is axially adjustable and its inner end face presses against the sealing element.

[0011] In the aforementioned hydraulic dynamometer, the adjusting screw is rotatably connected to the housing and axially fixed. The adjusting screws are arranged in pairs and are respectively screwed to the upper and lower sides of the adjusting cover. Their ends pass through the housing and are connected to adjusting gears. A drive gear meshes between the two adjusting gears. The drive gear is connected to a power mechanism such as a stepper motor.

[0012] In the aforementioned hydraulic dynamometer, the bearing housing and the connecting boss are centered by a stop structure at the inner circle, and the bearing housing and the connecting boss are detachably connected by a number of axial fasteners.

[0013] In the aforementioned hydraulic dynamometer, the sealing ring assembly includes an outer sealing ring and an inner sealing ring. The two ends of the inner sealing ring abut against the inner ring of the bearing and the bushing, respectively. The outer sealing ring is mounted on the step of the bearing housing. The two ends of the outer ring of the bearing abut against the outer sealing ring and the inner convex ring of the bearing cover plate, respectively.

[0014] Compared with the prior art, this utility model has the following advantages: 1. This utility model provides a hydraulic dynamometer with a modular bearing housing structure. During maintenance, the bearing housing can be removed separately to replace, maintain and repair the bearings and sealing rings without disassembling the entire housing and main shaft, which greatly saves downtime and maintenance workload.

[0015] 2. This utility model allows for further inspection and replacement of the seals between the spindle and the housing by disassembling the fixing plug. Tightening the fixing plug can apply a precise sealing preload, ensuring the sealing of the water chamber in the housing and preventing leakage. When the seals wear out after long-term use, the fixing plug can be tightened again to compensate for the wear and extend the service life of the seals.

[0016] 3. This utility model also improves the internal cavity adjustment mechanism, which can more smoothly change the position of the adjustment cover, thereby accurately changing the effective working volume of the water cavity and applying a very precise and continuously varying load torque to the main shaft. Attached Figure Description

[0017] Figure 1 This is a perspective view of the present invention; Figure 2 This is an axial sectional view of the present invention; Figure 3 This is a radial sectional view of the present invention; Reference numerals in the attached drawings: 1. Housing; 2. Main shaft; 3. Driven impeller; 4. Fixed impeller; 5. Bearing housing; 6. Bearing; 7. Sealing ring assembly; 8. Adjusting screw; 9. Adjusting gear; 10. Adjusting cover; 11. Connecting boss; 12. Bearing cover plate; 13. Fixing plug; 14. Sealing cavity; 15. Drive gear; 16. Bushing. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figure 1-3 : A hydraulic dynamometer includes a housing 1 and a main shaft 2. A seal is provided between the housing 1 and the main shaft 2 to form a closed water cavity inside the housing 1. A driven impeller 3 is mounted on the main shaft 2, and a fixed impeller 4 is provided on the inner wall of the housing 1. The driven impellers 3 and the fixed impellers 4 are arranged in pairs. During operation, the driven impellers 3 and the fixed impellers 4 rotate relative to each other to agitate the water flow in the water cavity and generate a load torque. Bearing seats 5 are detachably connected to both ends of the housing 1. The bearing seats 5 are provided with a bearing 6 that supports the rotation of the main shaft 2 and a sealing ring assembly 7 that seals the bearing cavity. The bearing 6 and the sealing ring assembly 7 can be inspected and replaced by disassembling the bearing seats 5.

[0019] Specifically, the detachable structure of the bearing seat 5 is as follows: connecting bosses 11 are respectively provided on the outer walls of both ends of the housing 1, the bearing seat 5 is detachably connected to the outside of the connecting bosses 11, and the outer end of the bearing seat 5 is covered with a bearing cover plate 12; preferably, the connecting bosses 11 are circular annular platforms or spaced fan-shaped annular platforms that are adapted to the bearing seat 5.

[0020] Furthermore, the bearing seat 5 and the connecting boss 11 are centered by a stop structure at the inner circle, and the bearing seat 5 and the connecting boss 11 are detachably connected by a number of axial fasteners.

[0021] The sealing ring assembly 7 in this embodiment adopts a conventional sealing ring structure, including an outer sealing ring and an inner sealing ring.

[0022] Comparison Appendix Figure 1 and attached Figure 2 When it is necessary to inspect and replace the bearing 6 and the sealing ring, the bearing housing 5 can be removed from the spindle 2 after disassembling the fasteners. The bearing 6 and sealing ring assembly 7 will then detach from the spindle 2 along with the bearing housing 5, allowing for the inspection and replacement of the bearing 6 and the sealing ring. After inspection and replacement, the bearing 6, the sealing ring, the bearing housing 5, and the bearing cover plate 12 are assembled into a whole and then reassembled. After assembly, the two ends of the inner sealing ring abut against the inner ring of the bearing 6 and the bushing 16, respectively. The outer sealing ring is assembled on the step of the bearing housing 5, and the two ends of the outer ring of the bearing 6 abut against the outer sealing ring and the inner convex ring of the bearing cover plate 12, respectively.

[0023] In this embodiment, the fixing structure of the seal is as follows: the fixed impeller 4 extends outward to form a sealing cavity 14 for installing the seal, the fixing plug 13 is fitted on the main shaft 2 and screwed to the fixed impeller 4, and the fixing plug 13 is adjusted axially and its inner end face presses against the seal.

[0024] During installation or when the preload of the seal needs to be adjusted, rotate the fixing screw 13 so that the fixing screw 13 moves axially along the main shaft 2 until it stops at the predetermined position.

[0025] Furthermore, to facilitate the adjustment of the fixing plug 13, the bearing seat 5 and the connecting boss 11 together form a cavity with a side opening, and the cavity is provided with an adjustable locking seal fixing plug 13; furthermore, the fixing plug 13 is provided with a tooling groove that can be adjusted from the side opening, and the fixing plug 13 can be adjusted by clamping the tooling groove with a specific tool.

[0026] Comparison Appendix Figure 3 In this embodiment, an internal cavity adjustment mechanism is also provided inside the housing 1, including an adjustment screw 8, an adjustment gear 9 and an adjustment cover 10. The adjustment screw 8 is driven by the adjustment gear 9 and has two opposite threaded sections. The adjustment cover 10 is composed of a pair of semi-annular shells, which cover the driven impeller 3 and are respectively screwed onto the opposite threaded sections.

[0027] Furthermore, the adjusting screw 8 is rotatably connected to the housing 1 and axially fixed. The adjusting screw 8 is arranged in pairs and screwed to the upper and lower sides of the adjusting cover 10 respectively. Its ends pass through the housing 1 and are connected to the adjusting gear 9. The two adjusting gears 9 are simultaneously meshed with the driving gear 15. The driving gear 15 is connected to the power mechanism such as a stepper motor.

[0028] The adjustment method of the above-mentioned internal cavity adjustment mechanism is as follows: the drive gear 15 drives the two adjustment gears 9 to rotate, the adjustment gears 9 drive the adjustment screw 8 to rotate, and the screw connection structure between the adjustment screw 8 and the adjustment cover 10 (which can slide radially along the limit guide rail inside the housing 1) converts the rotational motion of the adjustment screw 8 into the radial displacement of the adjustment cover 10. Since the two adjustment covers 10 are screwed on opposite threads, the two adjustment covers 10 move towards or away from each other, thereby changing the effective working volume of the water cavity.

[0029] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A hydraulic dynamometer, comprising a housing (1) and a main shaft (2), wherein a sealing element is provided between the housing (1) and the main shaft (2) to form a closed water cavity inside the housing (1), a driven impeller (3) is mounted on the main shaft (2), and a fixed impeller (4) is provided on the inner wall of the housing (1), wherein the driven impeller (3) and the fixed impeller (4) rotate relative to each other to agitate the water flow in the water cavity to generate a load torque, characterized in that, The two ends of the housing (1) are detachably connected to bearing seats (5). The bearing seats (5) are provided with a bearing (6) that supports the rotation of the main shaft (2) and a sealing ring assembly (7) that seals the cavity of the bearing (6). The housing (1) is provided with an internal cavity adjustment mechanism, including an adjustment screw (8), an adjustment gear (9) and an adjustment cover (10). The adjustment screw (8) is driven by the adjustment gear (9) and has two opposite threaded sections. The adjustment cover (10) is composed of a pair of semi-annular shells, which cover the driven impeller (3) and are respectively screwed onto the opposite threaded sections.

2. The hydraulic dynamometer according to claim 1, characterized in that, The outer walls at both ends of the housing (1) are respectively provided with connecting bosses (11), and the bearing seat (5) is detachably connected to the outside of the connecting bosses (11). The outer end of the bearing seat (5) is covered with a bearing cover plate (12).

3. A hydraulic dynamometer according to claim 2, characterized in that, The bearing seat (5) and the connecting boss (11) together form a side-opening cavity, and an adjustable locking seal fixing plug (13) is provided in the cavity.

4. A hydraulic dynamometer according to claim 3, characterized in that, The fixed impeller (4) extends outward to form a sealing cavity (14) for installing the seal. The fixed screw plug (13) is fitted onto the main shaft (2) and screwed onto the fixed impeller (4). The fixed screw plug (13) is axially adjustable and its inner end face presses against the seal.

5. A hydraulic dynamometer according to claim 1, characterized in that, The adjusting screw (8) is rotatably connected to the housing (1) and axially fixed. The adjusting screws (8) are arranged in pairs and are respectively screwed to the upper and lower sides of the adjusting cover (10). Their ends pass through the housing (1) and are connected to the adjusting gears (9). The two adjusting gears (9) are simultaneously meshed with the driving gears (15).

6. A hydraulic dynamometer according to claim 2, characterized in that, The bearing housing (5) and the connecting boss (11) are centered by the stop structure at the inner circle, and the bearing housing (5) and the connecting boss (11) are detachably connected by a number of axial fasteners.

7. A hydraulic dynamometer according to claim 2, characterized in that, The sealing ring assembly (7) includes a sealing outer ring and a sealing inner ring. The two ends of the sealing inner ring abut against the inner ring of the bearing (6) and the bushing (16) respectively. The sealing outer ring is mounted on the step of the bearing seat (5). The two ends of the outer ring of the bearing (6) abut against the sealing outer ring and the inner convex ring of the bearing cover plate (12) respectively.

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