Wheel set supporting frame with brake disc

Abstract

The invention relates to the technical field of railway vehicle wheel set supporting, in particular to a wheel set supporting frame with a brake disc, which comprises a bearing main body, an inclined plane supporting unit, a limiting assembly, a buffer gasket, a fastener and a bottom plate. The bearing body is made of Q345 low-alloy high-strength steel or equivalent materials (the yield strength is larger than or equal to 345 MPa) and provided with reinforcing ribs, and the bottom plate is provided with anti-skid grooves. The slope supporting unit realizes uniform distribution of axial load through specific angle design, and is matched with a buffer gasket to protect the outer surface of the wheel pair; the limiting assemblies limit transverse displacement of the wheel sets through the arc-shaped guide grooves. The device is compact in structure, can stably support the wheel pair with the brake disc in the scenes of maintenance, assembly and the like, solves the problems of unstable support, insufficient applicability and the like in the prior art, is suitable for a narrow working environment, and has remarkable technical advantages and economical efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of rail transportation equipment manufacturing, and in particular relates to a wheelset support frame with a brake disc. Background Art

[0002] In the manufacturing and maintenance of rail vehicles, passenger car wheel sets are key components, typically consisting of an axle, two wheels, and two brake discs. Due to the short axle body and the narrow operating space and complex structure required to install the brake discs, traditional support frames have certain limitations in meeting the requirements for stable support.

[0003] In the prior art, the “Specialized hoist for wheels with brake discs” with publication number CN113845020B provides a technical solution for wheel lifting, which uses arc-shaped inserts to achieve positioning and lifting of the wheel after the brake disc is installed. However, this technology is mainly designed for lifting scenarios, and its functions focus on lifting. For scenarios that require long-term stable support (such as maintenance or assembly), its structural design fails to fully consider the force distribution between the brake disc and the axle, which may lead to unstable support or additional stress on the brake disc. In addition, the scope of application of this hoist is relatively limited, and it is difficult to be directly used for supporting operations of a complete set of wheels.

[0004] Another prior art is the "Built-in Pneumatic Wheelset Turntable" with publication number CN108002300B. This patent provides a turntable device for wheelset transportation, which pneumatically drives the turntable body to rotate and is equipped with a guide wheel mechanism to facilitate the passage of wheelsets with gearboxes and brake discs. However, the core function of this technology lies in the transportation and rotation of wheelsets, rather than being specially designed for the support of wheelsets. Although its structure can bear the weight of the wheelset, it does not fully consider the special spatial layout and stress conditions between the brake disc and the axle, which can easily lead to uneven support or local stress concentration. At the same time, the turntable device is large in size and occupies more space. It is difficult to deploy in a narrow working environment, and its maintenance cost is high, which further limits its applicability.

[0005] The above issues demonstrate that existing technical solutions for supporting wheelsets with brake discs still have significant shortcomings, such as a lack of a specifically designed support structure, a failure to fully consider the force distribution between the brake disc and the axle, and limitations in applicability and stability. Therefore, a new support frame for wheelsets with brake discs is urgently needed to address the existing technical issues, ensure the stability, safety, and convenience of the wheelset during support, while reducing maintenance costs and improving operational efficiency. Summary of the Invention

[0006] The present invention relates to a device for supporting wheelsets with brake discs. Through optimized design and rational component arrangement, this device addresses the issues of unstable support, limited applicability, and high maintenance costs encountered in existing technologies. The device's overall structure comprises a load-bearing body, an inclined support unit, a position-limiting assembly, a buffer gasket, fasteners, and a base plate. These components, through specific connection and installation methods, form a compact and efficient support system that meets the requirements for stable support of wheelsets with brake discs during rail vehicle manufacturing and maintenance.

[0007] First, the load-bearing body, serving as the basic framework of the entire device, adopts a rectangular structure and is made of Q345 low-alloy high-strength steel or equivalent material (yield strength ≥ 345 MPa) to enhance overall rigidity. The four corners of the load-bearing body are bolted together to form a stable load-bearing platform. In practical applications, the rectangular structure design ensures more uniform load distribution and avoids deformation or damage caused by localized stress concentration. To further enhance the bending and torsion resistance of the load-bearing body, multiple reinforcing ribs are installed inside it. The cross-section of the reinforcing ribs is L-shaped or triangular, which significantly enhances the overall strength of the load-bearing body. In addition, a base plate is installed at the bottom of the load-bearing body. The planar dimensions of the base plate extend at least 12 mm beyond the edge of the load-bearing body, thereby expanding the support area and reducing the pressure per unit area. The thickness of the base plate ranges from 10 mm to 18 mm, with 14 mm being preferred (reducing costs by 23% and reducing stiffness by less than 5%). Its lower surface is machined with striped grooves for drainage and increasing the friction coefficient, thereby improving the device's anti-slip performance in slippery environments.

[0008] Secondly, the inclined plane support unit is located inside the load-bearing body and is the core component that supports the axle body of the wheelset. The angle between the two inclined planes of the inclined plane support unit ranges from 95° to 115°. This angle has been verified through many tests and can provide the best support effect on axles of different diameters. The surface of the inclined plane support unit has undergone a heat treatment process, and the hardness value reaches HRC55 or above, which significantly improves the wear resistance and service life. When the axle body of the wheelset is placed on the inclined plane support unit, the inclined plane forms a line contact with the outer circumferential surface of the axle body. This contact method makes the supporting force evenly distributed along the axial direction, avoiding the stress concentration phenomenon commonly seen in traditional support devices. In order to further protect the outer surface of the wheel, a buffer gasket is placed between the inclined plane support unit and the wheelset. The buffer gasket is made of polyurethane elastomer (brand Made of LFM 2370 or equivalent (tensile strength ≥ 35 MPa), the cushioning pads have a thickness range of 6 mm to 18 mm and a Shore hardness of 45A to 65A, adjustable to meet specific needs. The cushioning pads' elastic modulus absorbs vibrations and reduces wear on the wheel's outer surface during support. They also provide a cushioning effect, mitigating the risk of minor wheel displacement during support.

[0009] Next, the limit assembly is installed above the inclined support unit to limit the displacement of the wheelset and prevent it from sliding or offsetting during the support process. The inner diameter of the limit assembly is slightly larger than the diameter of the wheelset axle body, and the inner diameter is 0.5-1.2mm larger than the diameter of the wheelset axle body (clearance), which allows for slight adjustment while limiting the lateral movement of the wheelset. An arc-shaped guide groove is provided on the inner side of the limit assembly. The curvature radius of the arc-shaped guide groove matches the outer radius of the wheelset axle body, so that the restraining force applied by the limit assembly when fixing the wheelset is evenly distributed, avoiding damage to the wheelset surface due to excessive local pressure. The limit assembly is fixedly connected by fasteners, and the head of the fastener is embedded under the surface of the limit assembly to ensure that the contact between the limit assembly and the wheelset is closer and there is no risk of loosening. The number of fasteners is configured according to the load-bearing capacity of the device, usually M12 grade 8.8 high-strength bolts (tensile strength ≥800MPa) with a torque value of 120±10N·m to ensure the fixing effect.

[0010] In actual operation, the axle body of the wheelset is first placed on the inclined support unit so that the inclined surface of the inclined support unit is in line contact with the outer circumference of the axle body. The limit assembly is then fixed on the top of the inclined support unit by fasteners to complete the initial positioning of the wheelset. Buffer gaskets are then placed between the inclined support unit and the wheelset to ensure that the outer surface of the wheel is protected and absorbs vibrations. Finally, the base plate is fixed to the bottom of the load-bearing body to complete the assembly of the entire device. At this point, the device has the ability to stably support the wheelset with brake discs. Due to the compact structure of the device and the small space it occupies, it can flexibly adapt to various narrow working environments. For example, in a rail vehicle maintenance workshop, the device can be conveniently deployed in a limited space without the need for additional modifications to the work area.

[0011] Furthermore, the operating principle of the device is to achieve uniform distribution of the weight of the wheelset through the synergy of the inclined support unit and the limit assembly. The line contact support force provided by the inclined support unit enables the axial load to be evenly transmitted, while the limit assembly limits the lateral displacement of the wheelset through the design of the arc guide groove, avoiding sliding or offset due to external interference. In addition, the flexible material and appropriate thickness of the buffer gasket not only reduce the wear on the outer surface of the wheel, but also enhance the stability during the support process. Under complex working conditions, such as when the ground is uneven or there is vibration, the anti-slip texture and striped groove design of the bottom plate significantly improve the overall stability of the device, enabling it to operate reliably under various ground conditions.

[0012] The specific application scenarios of this device include, but are not limited to, the maintenance, assembly, and transportation of wheelsets for rail vehicles. For example, during the wheelset maintenance process, the device can stably support the wheelset with brake discs for a long time, ensuring that technicians' work efficiency is not affected by unstable support during operation. In the assembly scenario, the design of the device takes into account the special spatial layout and stress conditions between the brake disc and the axle, avoiding the occurrence of local stress concentration. In addition, the device's compact structure and low maintenance cost make it highly economical and practical in actual applications.

[0013] Beneficial Effects: Through rational structural design and component layout, this invention provides a novel wheelset support device with brake discs. This device addresses the issues of unstable support and limited applicability found in existing technologies. Through its innovative design, it achieves stability and safety during the wheelset support process. Furthermore, the device boasts a compact structure and small footprint, making it suitable for a variety of confined working environments. It offers significant technical advantages and broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0015] Figure 2 It is a partial enlarged view of the inclined support unit;

[0016] Figure 3 It is a structural diagram of the limit component;

[0017] Figure 4 This is an enlarged view of the base plate.

[0018] Figure: 1, load-bearing body; 2, inclined support unit; 3, limit assembly; 4, buffer gasket; 5, fastener; 6, bottom plate; 7, reinforcing rib; 8, arc guide groove; 9, striped groove DETAILED DESCRIPTION

[0019] The present invention relates to a wheelset support frame with a brake disc, which solves the problems of unstable support, insufficient applicability and high maintenance cost in the prior art by optimizing the design and rationally arranging the structures of various components. Figures 1 to 4 1 to 9 describe in detail the specific embodiments of the present invention.

[0020] like Figure 1As shown, the overall structure of the device is composed of a load-bearing body 1, an inclined support unit 2, a limit assembly 3, a buffer gasket 4, a fastener 5 and a base plate 6. The load-bearing body 1 serves as the basic frame part of the entire device. It adopts a rectangular structure design and uses Q345 low-alloy high-strength steel or equivalent materials (yield strength ≥ 345MPa) to enhance the overall rigidity. The four corners of the load-bearing body 1 are fixedly connected by bolts to form a stable load-bearing platform. In practical applications, the design of the rectangular structure makes the load distribution more uniform and avoids deformation or damage caused by local stress concentration. In order to further enhance the bending and torsion resistance of the load-bearing body 1, a plurality of reinforcing ribs 7 are arranged inside it. The cross-sectional shape of the reinforcing ribs 7 is L-shaped or triangular. This design significantly enhances the overall strength of the load-bearing body 1. A base plate 6 is installed at the bottom of the load-bearing body 1. The plane size of the base plate 6 exceeds the edge of the load-bearing body 1 by at least 12mm, thereby expanding the support area and reducing the pressure per unit area. As shown Figure 4 As shown, the thickness of the bottom plate 6 ranges from 10 mm to 18 mm, and its lower surface is processed with striped grooves 9 for drainage and increasing the friction coefficient. Through stiffness-cost multi-objective optimization, it is found that when the thickness of the bottom plate (6) is 14 mm (the preferred value), the material cost is reduced by 23% compared with the 18 mm solution. Moreover, according to finite element analysis, the maximum deformation under the rated load increases by only 4.2% (0.38 mm → 0.396 mm), and the stiffness loss is less than the design threshold of 5%. At the same time, the design of the bottom plate edge extending 12 mm beyond the main body is maintained to ensure that the support pressure is ≤ 2.8 MPa (35% of the bearing limit of wet concrete floor).

[0021] The inclined support unit 2 is located at the top of the bearing body 1 and is the core component supporting the axle body of the wheelset. Figure 2 As shown, the angle between the two inclined surfaces of the inclined support unit 2 ranges from 95° to 115°. This angle has been tested by laboratory load (referring to standard TB / T 3355-2014). When the angle is 105°, the uniformity of the axial stress distribution of the wheelset is improved by 40% compared with 90° (see Table 1 below for comparative data), which can provide the best support effect on axles of different diameters. The surface of the inclined support unit 2 has undergone a heat treatment process, and the hardness value reaches HRC55 or above, which significantly improves the wear resistance and service life. When the axle body of the wheelset is placed on the inclined support unit 2, the inclined surface forms a line contact with the outer circumference of the axle body. This contact method makes the supporting force evenly distributed along the axial direction. In order to further protect the outer surface of the wheel, a buffer gasket 4 is placed between the inclined support unit 2 and the wheelset. The buffer gasket 4 is made of polyurethane elastomer (brand LFM 2370) or equivalent (tensile strength ≥ 35MPa) material, with a thickness range of 6mm to 18mm and a Shore hardness of 45A to 65A, which can be adjusted according to actual needs.

[0022] Angle Stress deviation coefficient Support stability rating 90° 0.32 Unqualified 105° 0.18 excellent

[0023] Table 1

[0024] In order to verify the stress distribution characteristics under the line contact condition, ANSYS Workbench 2021R1 was used to perform finite element static simulation. When the wheelset was loaded with a standard axle weight of 3.5 tons, the maximum stress value in the line contact area between the inclined support unit (2) and the wheelset axle body was 82.3 MPa (lower than 23.7% of the yield strength of Q345 steel), and the stress concentration factor was ≤1.8. The contact pressure was uniformly distributed along the axial direction, and the pressure fluctuation range was ±11.5%, which verified the effectiveness of the 95°-115° inclined plane angle design in reducing contact stress.

[0025] The wheelset spreader disclosed in the prior art CN113845020B adopts an arc-shaped insert plate structure, and its force mode is essentially different from that of this solution:

[0026] Load type: The arc-shaped insert plate of the hoist mainly bears unidirectional tensile load (hoisting working condition), while the inclined support unit 2 of this solution needs to bear the combined load (compression + bending + shear) caused by the weight of the wheelset;

[0027] Constraint mechanism: The arc-shaped insert is in point contact with the shaft body, and the peak contact stress reaches 210MPa, which can easily cause indentations on the shaft body surface;

[0028] Applicable scenarios: The sling structure has no anti-slip design on the bottom plate and cannot meet the ground support stability requirements.

[0029] This solution solves the risk of instability when the spreader structure is used for support by means of the coordinated constraint of the inclined line contact and the limit assembly 3.

[0030] The limiting assembly 3 is installed above the inclined support unit 2 to limit the displacement of the wheelset and prevent it from sliding or deflecting during the support process. Figure 3 As shown, the inner diameter of the limit assembly 3 is slightly larger than the diameter of the wheelset axle body, and the inner diameter is 0.5-1.2mm larger than the diameter of the wheelset axle body (clearance), which allows slight adjustment and limits the lateral movement of the wheelset. An arc-shaped guide groove 8 is provided on the inner side of the limit assembly 3. The curvature radius of the arc-shaped guide groove 8 matches the outer radius of the wheelset axle body, so that the restraining force applied by the limit assembly 3 when fixing the wheelset is evenly distributed. The limit assembly 3 is fixedly connected by a fastener 5, and the head of the fastener 5 is embedded below the surface of the limit assembly 3 to ensure that the contact between the limit assembly 3 and the wheelset is closer and there is no risk of loosening. The number of fasteners 5 is configured according to the load-bearing capacity of the device, usually M12 grade 8.8 high-strength bolts (tensile strength ≥ 800MPa) with a torque value of 120±10N·m5 to ensure the fixing effect.

[0031] In actual operation, first fix the base plate 6 to the bottom of the supporting body 1, place the buffer gasket 4 between the inclined support unit 2 and the wheelset, and place the axle body of the wheelset on the inclined support unit 2 so that the inclined surface of the inclined support unit 2 forms a line contact with the outer circumference of the axle body. Then, fix the limit assembly 3 above the inclined support unit 2 by fasteners 5 to complete the preliminary positioning of the wheelset. The buffer gasket 4 ensures that the outer surface of the wheel is protected and absorbs vibrations. At this point, the device has the ability to stably support the wheelset with brake discs. Due to the compact structure of the device and the small space it occupies, it can flexibly adapt to various narrow working environments.

[0032] The operating principle of the device is to achieve uniform distribution of the weight of the wheelset through the coordinated action of the inclined support unit 2 and the limiting assembly 3. The line contact support force provided by the inclined support unit 2 enables the axial load to be evenly transmitted, while the limiting assembly 3 limits the lateral displacement of the wheelset through the design of the arc guide groove 8, avoiding sliding or offset caused by external interference. In addition, the flexible material and appropriate thickness of the buffer gasket 4 not only reduce the wear of the outer surface of the wheel, but also enhance the stability during the support process. Under complex working conditions, such as when the ground is uneven or there is vibration, the anti-slip texture and striped groove 9 design of the base plate 6 significantly improve the overall stability of the device, enabling it to operate reliably under various ground conditions.

[0033] The specific application scenarios of this device include, but are not limited to, the maintenance, assembly, and transportation of wheelsets for rail vehicles. For example, during the wheelset maintenance process, the device can stably support the wheelset with brake discs for a long time, ensuring that technicians' work efficiency is not affected by unstable support during operation. In the assembly scenario, the design of the device takes into account the special spatial layout and stress conditions between the brake disc and the axle, avoiding the occurrence of local stress concentration. In addition, the device's compact structure and low maintenance cost make it highly economical and practical in actual applications.

[0034] In order to better enable relevant personnel in this technical field to fully understand and implement the present invention, the specific implementation principle of the present invention is further supplemented below with reference to a specific application scenario.

[0035] During the inspection and maintenance of rail vehicle wheelsets, the wheelset with brake disc to be inspected is first hoisted onto the support frame. During operation, the axle body of the wheelset is slowly placed on the inclined surface of the inclined support unit 2 to ensure that the inclined surface forms a line contact with the outer circumference of the axle body. This line contact method is achieved by the design of the two inclined angles of the inclined support unit 2 (ranging from 95° to 115°), and the angles are optimized to provide a uniform distribution of supporting force on axles of different diameters. Since the surface of the inclined support unit 2 has undergone a heat treatment process and the hardness value reaches HRC55 or above, it can effectively resist wear during long-term use, thereby extending the service life of the device. In this step, the high hardness surface of the inclined support unit 2 and the flexible material of the buffer gasket 4 work together to ensure the uniform transmission of the supporting force and avoid scratches or damage to the outer surface of the wheel due to direct contact with the hard material.

[0036] Subsequently, the limiting assembly 3 is fixed above the inclined support unit 2 by the fastener 5. The arc-shaped guide groove 8 of the limiting assembly 3 is designed so that its inner curvature radius matches the outer radius of the wheelset axle body, thereby applying a uniform restraining force when fixing the wheelset. The head of the fastener 5 is embedded below the surface of the limiting assembly 3 to ensure a tight connection without the risk of loosening. In this step, the limiting assembly 3 limits the lateral movement of the wheelset through micro-clearance fit, while allowing a certain degree of adjustment to accommodate wheelsets of different specifications. This design not only improves the applicability of the device, but also avoids the risk of damage to the wheelset surface due to excessive local pressure.

[0037] After completing the initial positioning, place the buffer pad 4 between the inclined support unit 2 and the wheelset. The buffer pad 4 is made of polyurethane elastomer (brand Made of LFM 2370 or equivalent (tensile strength ≥ 35 MPa), with a thickness ranging from 6 mm to 18 mm and a Shore hardness of 45A to 65A, its elastic properties absorb vibration during the support process and reduce wear on the wheel's outer surface, reducing wear by 52% (60A Shore hardness with a buffer pad vs. without a pad, according to ISO 4649 friction test standard). Furthermore, the appropriate thickness of the buffer pad 4 provides additional cushioning in challenging operating conditions (such as uneven surfaces or vibration), thereby enhancing stability throughout the support process.

[0038] Finally, the base plate 6 is secured to the bottom of the support body 1, completing the assembly of the entire device. The planar dimensions of the base plate 6 extend at least 12 mm beyond the edge of the support body 1, increasing the support surface and reducing the pressure per unit area. The underside of the base plate 6 is machined with striped grooves 9. These grooves not only drain water but also increase the coefficient of friction, thereby enhancing the device's anti-slip performance in slippery environments. In practical applications, the design of the base plate 6 significantly enhances the overall stability of the device, enabling reliable operation in a variety of surface conditions.

[0039] Through the above steps, the device achieves stable support for the wheelset with brake discs. The line contact support force provided by the inclined support unit 2 makes the axial load evenly distributed along the shaft body, avoiding the stress concentration phenomenon commonly seen in traditional support devices. The limit assembly 3 limits the lateral displacement of the wheelset through the design of the arc guide groove 8, preventing it from sliding or offsetting during the support process. The flexible material and appropriate thickness of the buffer gasket 4 further reduce the wear on the outer surface of the wheel and enhance the stability during the support process. The anti-slip texture and striped groove design of the base plate 6 ensure the reliability of the device under complex working conditions.

[0040] The device also excels in rail vehicle wheelset assembly. For example, when technicians need to assemble a wheelset with a brake disc, the device's design takes into account the unique spatial layout and stress conditions between the disc and the axle, avoiding localized stress concentration. Its compact design allows for flexible adaptation to a variety of confined working environments, while its low maintenance costs further enhance its cost-effectiveness and practicality.

[0041] In summary, this device, through its rational structural design and component layout, addresses the issues of unstable support and limited applicability found in existing technologies, ensuring stability and safety during the wheelset support process. Furthermore, its compact structure and minimal footprint make it suitable for a variety of confined working environments, offering significant technical advantages and broad application prospects.

Claims

1. A wheelset support frame with a brake disc, characterized in that: The invention comprises a bearing body (1), an inclined support unit (2), a limiting assembly (3), a buffer gasket (4), a fastener (5) and a base plate (6); the bearing body (1) is a rectangular frame structure, with a reinforcing rib (7) provided inside and the bottom connected to the base plate (6); the inclined support unit (2) is arranged on the top of the bearing body (1) and is used to support the axle body of the wheelset; the limiting assembly (3) is installed above the inclined support unit (2) and is used to limit the lateral displacement of the wheelset; the buffer gasket (4) is arranged between the inclined support unit (2) and the wheelset; the fastener (5) is used to fix the limiting assembly (3); and the lower surface of the base plate (6) is provided with a stripe-shaped groove (9).

2. The wheelset support frame with brake disc according to claim 1, characterized in that: The load-bearing body (1) is made of Q345 low-alloy high-strength steel or equivalent materials such as Q355B or ASTM A572 Grade 50 (yield strength ≥ 345 MPa), and its four corners are fixedly connected to the base plate (6) by bolts, and the cross-section shape of the internal reinforcement ribs (7) is L-shaped or triangular.

3. The wheelset support frame with brake disc according to claim 1, characterized in that: The angle between the two inclined surfaces of the inclined surface support unit (2) ranges from 95° to 115°, and the surface hardness value thereof reaches above HRC55.

4. The wheelset support frame with brake disc according to claim 1, characterized in that: The inner diameter of the limiting component (3) is larger than the diameter of the wheelset axle body, and the inner diameter is 0.5-1.2 mm (clearance) larger than the diameter of the wheelset axle body. An arc guide groove (8) is provided on the inner side thereof, and the curvature radius of the arc guide groove (8) matches the outer circle radius of the wheelset axle body.

5. The wheelset support frame with brake disc according to claim 1, characterized in that: The buffer pad (4) is made of polyurethane elastomer (brand LFM 2370) or equivalent (tensile strength ≥ 35MPa) material, with a thickness range of 6mm to 18mm and a Shore hardness of 45A to 65A.

6. The wheelset support frame with brake disc according to claim 1, characterized in that: The plane dimension of the bottom plate (6) exceeds the edge of the supporting body (1) by at least 12 mm, and the thickness ranges from 10 mm to 18 mm, preferably 14 mm.

7. The wheelset support frame with brake disc according to claim 1, characterized in that: The number of the fasteners (5) is configured according to the load-bearing capacity of the device, and the fasteners are M12 grade 8.8 high-strength bolts (tensile strength ≥ 800 MPa) with a torque value of 120±10 N·m (5).

8. The wheelset support frame with brake disc according to claim 1, characterized in that: The striped grooves (9) are arranged on the lower surface of the bottom plate (6) and are used for draining water and increasing the friction coefficient.

9. The wheelset support frame with brake disc according to claim 1, characterized in that: The inclined plane support unit (2) forms line contact with the outer circumferential surface of the wheelset axle body, and the limiting assembly (3) is fixed above the inclined plane support unit (2) via a fastener (5).

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