Checking device for engine crankshaft of large truck

Abstract

The utility model relates to the technical field of crankshaft production equipment, in particular to an inspection device for an engine crankshaft of a large truck, which comprises a base, a crossed roller slewing bearing and a ball platform, and the ball platform is movably arranged on the upper side of the base through the crossed roller slewing bearing. The upper end of the crossed roller slewing bearing is higher than the upper end of the base; the ball platform comprises an annular supporting plate and a plurality of balls movably arranged on the supporting plate. According to the utility model, the inspection of the crankshaft can be more convenient, rapid and labor-saving, and the production efficiency of the crankshaft is also improved.

Description

Technical Field

[0001] This utility model relates to the field of crankshaft production equipment technology, specifically to an inspection device for crankshafts of large truck engines. Background Technology

[0002] The crankshaft is one of the core components of an internal combustion engine, responsible for converting the reciprocating motion of the piston into rotational motion. Its manufacturing process requires high precision and strict material performance requirements. It bears the force transmitted from the connecting rod and converts it into torque, which is then output through the crankshaft to drive other accessories on the engine. The crankshaft is subjected to the combined effects of centrifugal force from the rotating mass, periodically changing gas inertial force, and reciprocating inertial force, resulting in bending and torsional loads. Therefore, the crankshaft requires sufficient strength and rigidity, and the journal surface must be wear-resistant and well-balanced. During production, holes need to be drilled in the crankshaft, followed by a deburring process. After all processes are completed, the crankshaft must be inspected to ensure that its surface and oil holes are free of residual burrs, cracks, or sharp edges, thus preventing lubricant contamination, bearing scratches, or stress concentration during operation.

[0003] Existing inspection methods include visual inspection and tactile inspection. To facilitate the inspection, the crankshaft needs to be rotated during the inspection process. However, for large truck engine crankshafts, which are heavy, manual rotation is laborious. Therefore, we have developed an inspection device for large truck engine crankshafts. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an inspection device for crankshafts of large truck engines, which can make crankshaft inspection more convenient, faster and less labor-intensive, and also improve the production efficiency of crankshafts.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an inspection device for crankshafts of large truck engines, comprising a base, a crossed roller slewing bearing, and a ball bearing platform. The ball bearing platform is movably mounted on the upper side of the base via the crossed roller slewing bearing, wherein the upper end of the crossed roller slewing bearing is higher than the upper end of the base. The ball bearing platform includes an annular support plate and a plurality of balls movably mounted on the support plate. The support plate and the crossed roller slewing bearing are coaxially arranged.

[0006] Preferably, the ball bearing platform further includes an adjustment component; the support plate is composed of a minor arc plate and a major arc plate; the major arc plate is fixedly connected to the cross roller slewing bearing; the adjustment component is disposed between the minor arc plate and the cross roller slewing bearing to adjust the horizontal height of the minor arc plate.

[0007] Preferably, the adjustment assembly includes an adjustment screw and two guide posts; the two guide posts slide longitudinally through the minor arc plate and are fixedly connected to the cross roller slewing bearing; the adjustment screw is threadedly connected to the minor arc plate, and the lower end of the adjustment screw is slidably connected to the upper end face of the cross roller slewing bearing.

[0008] Preferably, the two guide posts are placed on either side of the adjusting screw.

[0009] Preferably, the guide post and the crossed roller slewing bearing are connected by threads.

[0010] Preferably, a number of balls are evenly distributed on the pallet.

[0011] Preferably, the base has a through hole that aligns with the axis of the support plate.

[0012] Preferably, the ball bearing platform further includes a collision protection strip; the collision protection strip is located on the inner side of the support plate.

[0013] Preferably, the anti-collision strip is bonded to the support plate.

[0014] Preferably, the anti-collision strip is made of plastic.

[0015] Compared with the prior art, the beneficial effects of this utility model are: by setting a sliding platform composed of several balls on the cross roller slewing bearing, the crankshaft is placed on the sliding platform, and its front and rear shafts are slidably supported. Using this inspection device to perform visual and tactile inspections of the crankshaft of large truck engines is more convenient and labor-saving, and can improve the production efficiency of crankshafts. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0017] Figure 2 For the present utility model Figure 1 Schematic diagram of the structure at point A;

[0018] Figure 3 This is a schematic diagram of the longitudinal cross-section of the inspection device of this utility model.

[0019] Figure 4 This is a schematic diagram of the structure of Embodiment 2 of this utility model.

[0020] In the diagram: 1. Base, 2. Cross roller slewing bearing, 3. Ball bearing platform, 31. Support plate, 32. Sleeve, 33. Ball bearing, 34. Anti-collision strip, 35. Guide post, 36. Adjusting screw. Detailed Implementation

[0021] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings, so that those skilled in the art can more clearly understand how to practice this utility model. Although this utility model has been described in conjunction with its preferred embodiments, these embodiments are merely illustrative and not intended to limit the scope of this utility model.

[0022] The existing crankshaft structure generally consists of a front shaft, connecting rod journal, crank, main journal, balance weight, and rear shaft. The front shaft, main journal, and rear shaft are coaxially arranged. The inspection device in this application is used to provide support for the crankshaft, especially for the front and rear shafts.

[0023] See Figure 1-3 In one embodiment of this utility model, an inspection device for crankshaft of a large truck engine includes: a base 1, a cross roller slewing bearing 2, and a ball bearing platform 3. The ball bearing platform 3 is rotatably mounted on the base 1 via the cross roller slewing bearing 2. During inspection, the ball bearing platform 3 can provide sliding support for the crankshaft.

[0024] The aforementioned crossed roller slewing bearing 2 is a high-precision, high-rigidity crossed roller slewing bearing device, widely used in equipment that needs to withstand complex loads (axial force, radial force, overturning moment) and achieve precise rotation. Its core design feature is the use of crossed cylindrical or tapered rollers, resulting in a more compact structure and superior performance. For crankshafts of heavy truck engines, the crossed roller slewing bearing 2 can provide more stable support.

[0025] After the crossed roller slewing bearing 2 is fixedly installed on the base 1, there is a height difference between its upper end and the upper end of the base 1, which creates an open space inside the crossed roller slewing bearing 2. After the crankshaft is mounted, the open space can provide rotation space for the connecting rod journal, crank, main journal and balance weight of the crankshaft.

[0026] The ball bearing platform 3 includes a support plate 31, a sleeve 32, balls 33, and a crash bar 34; the support plate 31 has an annular structure and is mounted on the cross roller slewing bearing 2 and is coaxial with the cross roller slewing bearing 2; the sleeve 32 and the balls 33 are arranged correspondingly, and the balls 33 are slidably mounted on the upper side of the support plate 31 through the sleeve 32;

[0027] Multiple sleeves 32 and balls 33 are provided, and the multiple sleeves 32 and balls 33 arranged in groups are evenly distributed around the axis of the support plate 31. In this way, a sliding platform composed of several balls 33 is formed on the support plate 31. During inspection, the crankshaft is placed on the sliding platform, and the front and rear shafts are supported by the sliding platform and are slidably connected to the sliding platform. At this time, the connecting rod journal, crank, main journal, and balance block are located inside the support plate 31. Under the limit of the connecting rod journal or crank, the crankshaft will not slip off the inspection device. Under the action of external force, the crankshaft can rotate around its own axis and around the axis of the support plate 31 on the inspection device, making the inspection of the crankshaft more convenient, faster, and less labor-intensive, and improving the production efficiency of the crankshaft.

[0028] Furthermore, the anti-collision strip 34 has a ring-shaped structure and is fixed to the inner side of the support plate 31 by adhesive bonding. The anti-collision strip 34 can effectively prevent rigid collisions between the crankshaft and the support plate 31 during the sliding process, thus preventing scratches on the crankshaft during inspection. The anti-collision strip 34 is generally made of hard plastic material, and silicone or rubber should not be used. Soft materials have a larger contact surface with the crankshaft, which will generate greater resistance to the sliding of the crankshaft. Conversely, hard plastic has point contact with the crankshaft, which has less impact on the sliding of the crankshaft.

[0029] Due to differences in crankshaft design, the front and rear crankshafts may be coaxial but have different diameters. In other words, the outer diameters of the front and rear crankshafts are different. During inspection, to facilitate crankshaft adjustment, it is necessary to keep the crankshaft horizontal. Based on this, please refer to [link / reference needed]. Figure 4 In one embodiment, the ball bearing platform 3 is further provided with an adjustment component; unlike the first embodiment, the support plate 31 is composed of a minor arc plate 31a and a major arc plate 31b. The minor arc plate 31a is fixedly connected to the cross roller slewing bearing 2, while the major arc plate 31b is movably set to the cross roller slewing bearing 2 through the adjustment component. The horizontal height of the major arc plate 31b can be easily adjusted by the adjustment component to support the one with the smaller outer diameter between the front and rear crankshaft shafts.

[0030] In this embodiment, the adjustment assembly includes an adjusting screw 36 and two guide posts 35 positioned on either side of the adjusting screw 36. The guide posts 35 are fixedly connected to the crossed roller slewing bearing 2, and the guide posts 35 longitudinally penetrate the curved plate 31b and are slidably connected to the curved plate 31b. The adjusting screw 36 longitudinally penetrates the curved plate 31b and is threadedly connected to the curved plate 31b. The screw rod of the adjusting screw 36 is slidably connected to the crossed roller slewing bearing 2. The two guide posts 35 serve as guides and limiters. The distance between the curved plate 31b and the crossed roller slewing bearing 2 can be adjusted by rotating the adjusting screw 36. The connection between the guide posts 35 and the crossed roller slewing bearing 2 can be a threaded connection, which facilitates assembly.

[0031] In one embodiment, to facilitate cleaning of the device, the base 1 is provided with a through hole that aligns with the axis of the cross roller slewing bearing 2 and the support plate 31. The through hole not only makes the inspection device lighter but also reduces dust accumulation.

[0032] This technical solution utilizes a sliding platform composed of several balls on a cross roller slewing bearing. After the crankshaft is placed on the sliding platform, its front and rear shafts are slidably supported. This inspection device makes it more convenient and labor-saving to perform visual and tactile inspections of the crankshaft of a large truck engine, thereby improving the production efficiency of the crankshaft.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. An inspection device for large truck engine crankshafts, characterized by: The application relates to a ball platform, which comprises a base (1), a cross roller slewing bearing (2) and a ball platform (3), wherein the ball platform (3) is movably arranged on the upper side of the base (1) through the cross roller slewing bearing (2), the upper end of the cross roller slewing bearing (2) is higher than the upper end of the base (1), the ball platform (3) comprises a ring-shaped supporting plate (31) and a plurality of balls (33) movably arranged on the supporting plate (31), and the supporting plate (31) is coaxially arranged with the cross roller slewing bearing (2).

2. An inspection device for large truck engine crankshafts as claimed in claim 1, characterized in that: The ball platform (3) further comprises an adjusting assembly, the supporting plate (31) is composed of a poor-arc plate and a good-arc plate, the good-arc plate is fixedly connected with the cross roller slewing bearing (2), and the adjusting assembly is arranged between the poor-arc plate and the cross roller slewing bearing (2) to adjust the horizontal height of the poor-arc plate.

3. An inspection device for large truck engine crankshafts as defined in claim 2, characterized in that: The adjusting assembly comprises an adjusting screw (36) and two guide columns (35), the two guide columns (35) longitudinally slide through the poor-arc plate and are fixedly connected with the cross roller slewing bearing (2), the adjusting screw (36) is threadedly connected with the poor-arc plate, and the lower end of the adjusting screw (36) is slidably connected with the upper end surface of the cross roller slewing bearing (2).

4. An inspection device for large truck engine crankshafts as defined in claim 3, characterized in that: The two guide columns (35) are arranged on the two sides of the adjusting screw (36).

5. An inspection device for large truck engine crankshafts as defined in claim 3, wherein: The guide column (35) is screw-connected with the cross roller slewing bearing (2).

6. An inspection device for large truck engine crankshafts as defined in claim 1, wherein: The plurality of balls (33) are uniformly distributed on the supporting plate (31).

7. An inspection device for large truck engine crankshafts as defined in claim 1, wherein: A through hole, which is coaxial with the axis of the supporting plate (31), is formed in the base (1).

8. An inspection device for large truck engine crankshafts as defined in claim 1, wherein: The ball platform (3) further comprises an anti-collision strip (34), and the anti-collision strip (34) is arranged on the inner side of the supporting plate (31).

9. An inspection device for large truck engine crankshafts as defined in claim 8, characterized in that: The anti-collision strip (34) is adhesively connected with the supporting plate (31).

10. An inspection device for large truck engine crankshafts as defined in claim 8, wherein: The anti-collision strip (34) is made of plastic.

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