A new energy engine torsional vibration test sensor fixing device without disassembly

Abstract

The utility model belongs to the field of automobile engine NVH test, specifically relates to a new energy engine undismounted torsional vibration test sensor fixing device. Including encoding sensor, switching flange, barbed fastening bolt, crankshaft pulley bolt, crankshaft pulley and engine cylinder body, the utility model uses the inside processing surface of shock absorbing pulley rim as the locating surface, guarantees good coaxial degree, adopts the through -hole design in the middle of frock, ensures that frock installation is completed also can use the tool to dismount the crankshaft pulley fixed bolt, also reduces the quality, reduces the moment of inertia. Adopt 3 group special barbed trial tension bolt design, this bolt adopts the middle rectangle guide slot design, not only can play radial fixed role in fastening, also carries out the mistake prevention limit to the installation direction. The device and sensor connection place have done a variety of interface design, can be used for the connection of different sensors, and the commonality is better.

Description

Technical Field

[0001] This utility model belongs to the field of automotive engine NVH testing, specifically relating to a non-removable torsional vibration test sensor fixing device for new energy engines. Background Technology

[0002] In NVH testing of the engine front-end pulley system, the traditional method of fixing it typically relies on the crankshaft pulley fixing bolts for tightening. This necessitates the removal of the pulley fixing bolts. On some models, removing these bolts immediately disrupts the hydraulic timing system. Therefore, before removing the bolts, it's necessary to disassemble numerous parts such as the cylinder head cover and oil pump, using specialized tools to reposition the timing system. After testing, the same method must be used to remove these parts again to reposition the timing and restore the crankshaft pulley fixing bolts. Each disassembly and reassembly takes approximately two days. Furthermore, frequent disassembly and reassembly degrade the sealing effect of the original seals, and repeated disassembly and reassembly of the crankshaft pulley bolts cause stress deformation and failure. This installation method reduces the effective thread length of the crankshaft pulley bolts, altering the original state of the test component. A suitable installation solution is needed that simultaneously ensures sufficient fixing rigidity, precise coaxiality, and minimal rotational inertia, while also allowing for convenient and quick disassembly and reassembly. Utility Model Content

[0003] In the development of NVH (Noise, Vibration, and Harshness) in automotive engines, it is necessary to test the torsional vibration of the front-end pulley system. This testing process requires mounting a high-precision encoder on the pulley. Therefore, a mounting device needs to be designed that simultaneously ensures sufficient rigidity, precise coaxiality, and minimal rotational inertia, while also allowing for easy and quick assembly and disassembly. The specific technical solution is as follows:

[0004] A non-disassembly torsional vibration test sensor fixing device for a new energy engine includes an encoder sensor, an adapter flange, a barbed fastening bolt, a crankshaft pulley bolt, a crankshaft pulley, and an engine block. The encoder sensor is mounted on the adapter flange, and the upper part of the adapter flange has various encoder docking and fixing bolt size openings. The lower part of the adapter flange has a guide groove that mates with the barbed fastening bolt. The top of the barbed fastening bolt is shaped like a triangular arrow, the middle part is a bolt thread, and the tail is a rectangular guide post and a barbed clamping plate. The rectangular guide post corresponds to a through hole on the crankshaft pulley, the barbed clamping plate is clamped on the crankshaft pulley, and the crankshaft pulley bolt fixes the crankshaft pulley and the engine block.

[0005] Furthermore, the guide groove is provided in three parts, each with a rectangular cross-section of different lengths and widths.

[0006] Furthermore, the length of the rectangular guide post is matched with the thickness of the crankshaft pulley.

[0007] This invention uses the inner machined surface of the shock-absorbing pulley rim as the positioning surface to ensure good coaxiality. The tooling features a through-hole design in the middle, ensuring that the crankshaft pulley fixing bolts can be removed with tools after the tooling is installed, while also reducing weight and rotational inertia. It employs a three-set design of dedicated barbed test tightening bolts with a central rectangular guide groove, which not only provides radial fixation during tightening but also prevents incorrect installation direction. The device has multiple interface designs at the sensor connection point, allowing for connection to different sensors and improving versatility.

[0008] Beneficial effects: Using this test scheme to fix the sensor does not change the original assembly relationship of the test piece, ensuring the authenticity and validity of the test results; it can reduce the timing disassembly and fixing process, improve test efficiency, and eliminate seal failure caused by frequent assembly. The device is made of aluminum alloy, which has high strength and low rotational inertia, and is designed with a mechanical assembly error-proof mechanism, making it safe and reliable. Attached Figure Description

[0009] Figure 1 Explosion and assembly structure diagram of this utility model;

[0010] Figure 2 Schematic diagram of the fastening connection structure between the barbed fastening bolt and the crankshaft pulley;

[0011] Figure 3 Schematic diagram of the adapter flange structure;

[0012] Figure 4 Schematic diagram of the barbed fastening bolt structure.

[0013] Figure label:

[0014] 1-Encoding sensor, 2-Adapter flange, 3-Barbed fastening bolt, 4-Crankshaft pulley bolt, 5-Crankshaft pulley and 6-Engine cylinder block, a-Fixing bolt size opening, b-Guide groove, c-Rectangular guide post, d-Triangular arrow shape. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] like Figure 1 As shown, a non-removable torsional vibration test sensor fixing device for new energy engines includes an coded sensor 1 and an adapter flange 2 (the specific structure is as follows). Figure 3As shown), barbed fastening bolt 3 (as shown) Figure 4 (As shown), crankshaft pulley bolt 4, crankshaft pulley 5, and engine block 6. The encoder sensor 1 is mounted on the adapter flange 2. The upper part of the adapter flange 2 is provided with various encoder docking and fixing bolt size ports a, which can match different encoders. The lower part of the adapter flange 2 is provided with a guide groove b that mates with the barbed fastening bolt 3. The top of the barbed fastening bolt 3 is set as a triangular arrow d, the middle part is the bolt thread, and the tail is a rectangular guide post c and a barbed clamping plate. The rectangular guide post c corresponds to the through hole on the crankshaft pulley 5, and the barbed clamping plate is clamped on the crankshaft pulley 5 (as shown). Figure 2 As shown), crankshaft pulley bolt 4 fixes crankshaft pulley 5 and engine block 6.

[0017] The guide groove b is provided in three places, with rectangular cross sections of different lengths and widths, to prevent incorrect installation of the fastening bolts.

[0018] The length of the rectangular guide post c matches the thickness of the crankshaft pulley 5.

[0019] During the design process, the barbed fastening bolt 3 is designed with a suitable length of barbed plate and rectangular guide post c through calculation. During installation, the bolt is first placed into the waist-shaped groove of the shock-absorbing belt pulley in a free state along with the adapter flange. Then, the barbed bolt is rotated by hand according to the arrow mark d on the top of the bolt so that the arrow points to the axis. The fastening bolt is then pulled outward by hand. At this time, the rectangular guide post c of the bolt enters the guide groove b of the adapter flange, the bolt position is fixed, the locking nut is tightened, and the adapter flange and crankshaft pulley are fixed. The encoder 1 and the adapter flange 2 are then connected by bolts, and the test can begin.

[0020] The preferred embodiments of this patent have been described in detail above. However, this patent is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this patent.

Claims

1. A non-removable torsional vibration test sensor fixing device for new energy engines, characterized in that: The system includes an encoder sensor (1), an adapter flange (2), a barbed fastening bolt (3), a crankshaft pulley bolt (4), a crankshaft pulley (5), and an engine block (6). The encoder sensor (1) is mounted on the adapter flange (2). The upper part of the adapter flange (2) is provided with various encoder docking and fixing bolt size openings (a). The lower part of the adapter flange (2) is provided with a guide groove (b) that mates with the barbed fastening bolt (3). The top of the barbed fastening bolt (3) is set as a triangular arrow shape (d), the middle part is a bolt thread, and the tail is a rectangular guide post (c) and a barbed clamping plate. The rectangular guide post (c) corresponds to the through hole on the crankshaft pulley (5). The barbed clamping plate is clamped on the crankshaft pulley (5). The crankshaft pulley bolt (4) is fixedly connected to the crankshaft pulley (5) and the engine block (6).

2. The non-removable torsional vibration test sensor fixing device for a new energy engine according to claim 1, characterized in that: The guide groove (b) is provided in three parts, each with a rectangular cross-section of different lengths and widths.

3. The non-removable torsional vibration test sensor fixing device for a new energy engine according to claim 1, characterized in that: The length of the rectangular guide post (c) matches the thickness of the crankshaft pulley (5).

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