Belt wheel hub pressure detection device

Abstract

The utility model provides a belt wheel hub pressure detection device, which comprises a pivot, a belt wheel, a bearing, a film pressure sensor, two pressure petals, a pressure head and a screw, the bearing is arranged in the belt wheel, the pressure petals are oppositely arranged, the opposite side surfaces of the pressure petals are provided with inner conical surfaces, the pressure head is provided with outer conical surfaces matched with the inner conical surfaces, and the film pressure sensor is arranged on the pivot. A screw hole is formed in the pressure head, a threaded hole is formed in the end part of the pivot, during assembly, the two pressure petals are arranged in the resistance-type flexible film pressure sensor, so that the resistance-type flexible film pressure sensor is nested between the bearing and the pressure petals, and a screw penetrates through the end part of the screw hole and is connected in the threaded hole of the pivot; the pressure detection assembly is connected to the pivot. The thin film pressure sensor is applied to detection of hub pressure, the clamping structure realizes rapid fixation of the thin film pressure sensor and the pivot, and the resistive thin film pressure sensor is in full contact with other parts so as to ensure pressure measurement precision.

Description

Technical Field

[0001] This utility model relates to the field of belt hub technology in automotive belt drive systems, and particularly to a belt hub pressure detection device. Background Technology

[0002] The automotive belt drive system, also known as the automotive engine pulley system or the Engine Front End Accessory Drive System (EFEADS), such as... Figure 1 As shown, this is a typical single-layer six-wheel FEEADS system, consisting of a crankshaft pulley (W1.CS), an air conditioning compressor pulley (W2.AC), a generator pulley (W3.ALT), a water pump pulley (W4.WP), a tensioner pulley (W5.TEN), an idler pulley (W6.IDL), and a multi-ribbed belt. During FEEADS operation, due to engine torsional vibration and the constantly changing load on the accessory pulleys, each segment ( Figure 1 The tension on the belts (B1-B6) is constantly changing, and due to belt vibration, slippage, etc., the magnitude and direction of the hub load F borne by any accessory pulley (W2 in the figure) are also constantly changing (different colored arrows represent the constantly changing hub load F). Figure 2 The definition of hub load is shown in the figure. β i Belt corner protector T i-1 —Tight edge tension, T i —Slack tension, hub load is T i , T i-1 The resultant force acting on the central axis of the pulley F i .

[0003] In EFEADS, the idler pulley and tensioner pulley are typically hinged to a pivot at their center via a bearing, with the other end of the pivot connected to a tensioning arm or directly fixed to the frame. Therefore, under the aforementioned dynamic hub load, the magnitude and direction of the hub pressure from the pulleys on the pivot surface are constantly changing. Consequently, it is necessary to monitor the magnitude and distribution characteristics of the hub pressure in real time during engine wheel train operation to provide data support for the pivot's structural design, thereby preventing damage to the pivot due to excessive stress or stress concentration on its surface and improving the pivot's service life. Utility Model Content

[0004] The technical problem to be solved by this utility model is: in order to overcome the shortcomings of the prior art, this utility model provides a wheel hub pressure detection device.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: a pulley hub pressure detection device, including a pressure detection component coupled between a pivot and a pulley. The pressure detection component includes a bearing, a resistive flexible thin-film pressure sensor, pressure flaps, a pressure head, and a screw. The bearing is disposed inside the pulley, and the outer ring of the bearing is fixedly connected to the inner ring of the pulley, preferably with an interference fit. The resistive flexible thin-film pressure sensor is annular and disposed inside the inner ring of the bearing. There are two pressure flaps arranged opposite each other, and each of the opposite sides of the pressure flaps is provided with an inner conical surface. The pressure head is provided with an outer conical surface that mates with the inner conical surface. The inside of the pressure head is provided with a screw hole. The end of the pivot is provided with a threaded hole. During assembly, the two pressure flaps are disposed inside the resistive flexible thin-film pressure sensor, so that the resistive flexible thin-film pressure sensor is nested between the bearing and the pressure flaps. The pressure head is inserted into the pressure flaps, and the inner and outer conical surfaces mate and expand radially to press the resistive flexible thin-film pressure sensor between the pressure flaps and the bearing. The screw passes through the screw hole and is connected to the threaded hole of the pivot, connecting the pressure detection component to the pivot.

[0006] Furthermore, the resistive flexible thin-film pressure sensor includes an annular sensing area, with an axial opening on the sidewall of the sensing area, and an external cable at the edge of the sensing area for outputting an electrical signal corresponding to the pressure detected by the sensing area.

[0007] Furthermore, a positioning guide structure is provided between the pivot and the pressure valve. The positioning guide structure includes a guide boss provided on the pivot and a guide groove provided on the pressure valve. During assembly, the guide boss is embedded in the guide groove.

[0008] Furthermore, it also includes rubber rings, which are fitted over the two pressure valves, securing them inside the rubber rings. The rubber rings can expand and contract under force, always remaining secured to the outer walls of the two pressure valves, thus restricting their radial movement.

[0009] The beneficial effects of this utility model are: the wheel hub pressure detection device provided by this utility model applies a thin-film pressure sensor to detect wheel hub pressure; the clamping structure enables quick fixation of the thin-film pressure sensor and the pivot, and ensures full contact between the resistive thin-film pressure sensor and the other components to guarantee the accuracy of pressure measurement. Attached Figure Description

[0010] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0011] Figure 1 This is a schematic diagram of a typical single-layer six-wheel FEAD system.

[0012] Figure 2This is a schematic diagram of the load on the wheel hub.

[0013] Figure 3 This is a three-dimensional structural diagram of the wheel hub pressure detection device of this utility model.

[0014] Figure 4 This is a top view schematic diagram of the wheel hub pressure detection device of this utility model.

[0015] Figure 5 yes Figure 4 A schematic diagram of the cross-sectional structure of AA.

[0016] Figure 6 This is a side view of the wheel hub pressure detection device of this utility model.

[0017] Figure 7 yes Figure 6 A schematic diagram of the cross-sectional structure of BB.

[0018] Figure 8 This is a schematic diagram of the pivot structure.

[0019] Figure 9 This is a schematic diagram of the structure of a resistive flexible thin-film pressure sensor.

[0020] Figure 10 This is a schematic diagram of the three-dimensional structure of the pressure head.

[0021] Figure 11 This is a schematic diagram of the main structure of the pressure head.

[0022] Figure 12 yes Figure 11 A schematic diagram of the cross-sectional structure of CC.

[0023] Figure 13 This is a schematic diagram of the three-dimensional structure of the pressure valve.

[0024] Figure 14 This is a schematic diagram of the inner surface structure of the pressure valve.

[0025] Figure 15 This is a schematic diagram of the left side structure of the pressure valve.

[0026] Figure 16 This is a schematic diagram of the right side structure of the pressure valve.

[0027] In the diagram: 1. Pulley, 2. Bearing, 3. Resistive flexible thin-film pressure sensor, 3.1. Sensing area, 3.2. External cable, 3.3. Opening, 4. Pressure disc, 4.1. Guide groove, 4.2. Inner conical surface, 5. Pressure head, 5.1. Outer conical surface, 5.2. Screw hole, 6. Screw, 7. Pivot, 7.1. Guide boss, 7.2. Threaded hole, 8. Rubber ring. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention. Therefore, they only show the components, orientations, and references (e.g., up, down, left, right, etc.) relevant to the present invention and are intended only to aid in the description of the features in the drawings. Therefore, the following specific embodiments are not intended to be restrictive, and the scope of the claimed subject matter is defined solely by the appended claims and their equivalents.

[0029] like Figures 3-16 As shown, the present invention discloses a pulley hub pressure detection device, including a pressure detection component coupled between a pivot 7 and a pulley 1. The pressure detection component includes a bearing 2, a resistive flexible thin-film pressure sensor 3, a pressure valve 4, a pressure head 5, and a screw 6. The pulley 1, screw 6, and bearing 2 are conventional structures. The bearing 2 is disposed inside the pulley 1, and the outer ring of the bearing 2 is fixedly connected to the inner ring of the pulley 1, preferably with an interference fit.

[0030] like Figure 8 As shown, a threaded hole 7.2 is opened in the center of the pivot 7, and two rectangular bosses are machined on both sides of the threaded hole 7.2 as guide bosses 7.1. The guide bosses 7.1 are adapted to the guide groove 4.1 at the bottom of the pressure valve 4, the end face of the pivot 7 is in contact with the end face of the pressure valve 4, and all contact surfaces between the pivot 7 and the pressure valve 4 are fully lubricated.

[0031] like Figure 9 As shown, the resistive flexible thin-film pressure sensor 3 is annular and disposed inside the inner ring of the bearing 2. The resistive flexible thin-film pressure sensor 3 includes an annular sensing area 3.1. An opening 3.3 is axially formed on the sidewall of the sensing area 3.1 to accommodate the size of the pressure flap 4. An external cable 3.2 is also provided at the edge of the sensing area 3.1 for outputting the electrical signal corresponding to the pressure detected by the sensing area 3.1. In this embodiment, the resistive flexible thin-film pressure sensor 3 has a conventional structure, mainly composed of the sensing area 3.1 and the external cable 3.2. Multiple measurement points are encapsulated inside the sensing area 3.1. When pressure is applied to the surface of the sensing area 3.1, the magnitude of the pressure and the surface pressure distribution characteristics can be detected. The resistive flexible thin-film pressure sensor 3 is generally thin-film shaped, and therefore can be bent into an arc shape. The sensing area 3.1 of the resistive flexible thin-film pressure sensor 3 is nested between the bearing 2 and the pressure flap 4, and under the radial pressure of the pressure flap 4, it can fully contact the inner wall of the bearing 2 and the outer wall of the pressure flap 4.

[0032] like Figures 10-12As shown, the pressure head 5 is a regular square pyramid with a countersunk hole in the center, serving as a screw hole 5.2. The four outer conical surfaces 5.1 on the side of the pressure head 5 are adapted to the inner conical surfaces 4.2 inside the two pressure discs 4. When the pressure head 5 is installed, the entire pressure head 5 is clamped between the two pressure discs 4, and the contact surfaces between the pressure head 5 and the pressure discs 4 are fully lubricated.

[0033] like Figures 13-16 As shown, there are two pressure flaps 4 arranged opposite each other, and each pressure flap 4 has an inner conical surface 4.2 on its opposite side. The pressure head 5 has an outer conical surface 5.1 that mates with the inner conical surface 4.2. The end face of the pressure flap 4 has a guide groove 4.1, which is adapted to the guide boss 7.1 on the pivot 7 to form a positioning and guiding structure. During assembly, the guide boss 7.1 is embedded in the guide groove 4.1 to achieve positioning between the pivot 7 and the pressure flap 4. At the same time, it can achieve radial guidance during assembly.

[0034] During assembly, two pressure flaps 4 are positioned inside the resistive flexible thin-film pressure sensor 3, nesting the sensor between the bearing 2 and the pressure flaps 4. The pressure head 5 is inserted into the pressure flaps 4, and the inner conical surface 4.2 and the outer conical surface 5.1 engage and expand radially to press the resistive flexible thin-film pressure sensor 3 between the pressure flaps 4 and the bearing 2. The screw 6 passes through the screw hole 5.2 and connects to the threaded hole 7.2 of the pivot 7, connecting the pressure detection assembly to the pivot 7. A rubber ring 8 is also included, which is fitted over the two pressure flaps 4, securing them inside. The rubber ring 8 can expand and contract under force, always remaining within the outer wall of the two pressure flaps 4, limiting their radial movement.

[0035] Assembly and working principle:

[0036] The outer ring of bearing 2 is pre-interfered with the center of pulley 1; screw 6 is turned a certain distance away from pivot 7. At this time, under the constraint of rubber ring 8, the two pressure petals 4 slide along the guide boss 7.1 of pivot 7 towards the axis, and the outer diameter formed by the two pressure petals 4 is reduced. Adjust the turning distance of screw 6 so that the outer diameter formed by the two pressure petals 4 is smaller than the inner diameter of bearing 2; extend the pressure petals 4 into bearing 2, roughly determine the axial relative position of pressure petals 4 and bearing 2, and leave an installation gap between the inner ring of bearing 2 and the outer wall of pressure petals 4; bend the sensing area 3.1 of resistive flexible thin film pressure sensor 3, and then completely nest it in the gap between the inner ring of bearing 2 and the outer wall of pressure petals 4; turn screw 6 away from pivot 7. The two pressure petals 4 are rotated a certain distance closer to the pivot 7, and slide outward along the guide boss 7.1 of the pivot 7. The outer diameter formed by the two pressure petals 4 is expanded, and the outer wall of the pressure petal 4 radially presses the resistive flexible film pressure sensor 3, ensuring that the resistive flexible film pressure sensor 3 is in full contact with the inner wall of the bearing 2 and the outer wall of the pressure petal 4 (poor contact will reduce the pressure measurement accuracy), and increasing the friction between the pressure petal 4, the film pressure sensor, and the inner wall of the bearing 2, thereby fixing the resistive flexible film pressure sensor 3 and the pressure petal 4 to the inner wall of the bearing 2; at the same time, under the pre-tightening force of the screw 6, the contact stress between the pressure petal 4 and the end face of the pivot 7 increases, and the pressure petal 4 is fixed to the end face of the pivot 7.

[0037] After installation, the engine wheel system is running normally. The resistive flexible thin film pressure sensor 3 detects the magnitude and distribution characteristics of the hub pressure on the pivot 7 in real time.

[0038] This invention enables the real-time detection of the hub pressure and its distribution characteristics on the pivot 7 during engine wheel system operation using a resistive thin-film pressure sensor. This provides data support for the structural design of the pivot 7, thereby preventing damage to the pivot 7 due to excessive or concentrated stress on its surface and improving its service life. A clamping structure is designed to ensure full contact between the resistive thin-film pressure sensor and other components, guaranteeing pressure measurement accuracy and enabling rapid fixation of the resistive thin-film pressure sensor and the pivot 7.

[0039] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the scope of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A wheel hub pressure detection apparatus characterized by: The pressure detection assembly is coupled between the pivot and the pulley, and comprises a bearing, a flexible thin film resistance pressure sensor, two pressure petals, a pressure head and a screw.

2. The wheel hub pressure detection apparatus according to claim 1, characterized by: The flexible thin film resistance pressure sensor comprises a ring-shaped sensing area, and an opening is formed in the side wall of the sensing area in the axial direction.

3. The wheel hub pressure detection apparatus of claim 1, wherein: The pivot and the pressure petals are further provided with a positioning guide structure, which comprises a guide boss arranged on the pivot and a guide groove arranged on the pressure petals.

4. The wheel hub pressure detection apparatus of claim 1, wherein: The rubber ring is sleeved on the outside of the two pressure petals to clamp the two pressure petals inside the rubber ring.

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