Punching auxiliary positioning tool for belt pulley

Abstract

The punching auxiliary positioning tool comprises a positioning seat, a positioning head and a supporting seat are arranged on the positioning seat, and the positioning head is used for stretching into a center hole of a hub of the belt wheel to achieve positioning installation of the whole belt wheel. The device is characterized in that an annular supporting wall used for supporting the bottom end face of a gear ring arranged on the belt pulley is arranged on the supporting seat. The auxiliary positioning device has the advantages that the structure is simple, and the annular supporting wall arranged on the supporting seat is used for stably supporting a gear ring with a balance hole during auxiliary positioning of punching the balance hole in the belt pulley, so that the gear ring is effectively prevented from being deformed, and the qualification rate of products is improved.

Description

Technical Field

[0001] This utility model relates to an auxiliary tooling for manufacturing pulleys, and more particularly to an auxiliary positioning tooling for drilling holes in pulleys. Background Technology

[0002] In automotive engine crankshaft systems, pulleys are primarily used to reduce crankshaft torsional wobble, ensure linear engine output, reduce stress levels, thereby improving crankshaft life and reducing overall vehicle vibration and noise. Currently, pulleys used in automotive engine crankshaft systems mainly consist of two parts: a gear ring and a hub. Typically, to improve the quality of the rotor and its components in the engine crankshaft system, reduce noise and vibration, and extend the lifespan of the supporting components (engine crankshaft), balance holes are drilled on the gear ring of the pulley. A drilling auxiliary tool is used to position and support the pulley during the drilling process. The drill bit then moves downwards to make the hole. Currently, existing drilling auxiliary tooling typically places the support point on the lower center protrusion of the hub, while the balance hole is drilled on the gear ring. This means that during processing, the gear ring portion for drilling the balance hole lacks any support. Therefore, as the drill bit moves downwards, the gear ring is prone to deformation, leading to defective products and increasing the defect rate. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a simple structure for a drilling auxiliary positioning fixture for pulleys that can effectively improve the product qualification rate.

[0004] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0005] A drilling-assisted positioning fixture for a pulley includes a positioning seat, on which a positioning head and a support seat are provided. The positioning head is used to extend into the central hole of the pulley hub to achieve overall positioning and installation of the pulley. The support seat is provided with an annular support wall for supporting the bottom end face of the toothed ring of the pulley.

[0006] The positioning seat is equipped with a support platform, and a central guide post protrudes upward from the support platform. The support seat is fitted onto the central guide post through a centrally located through-hole and fixedly mounted on the support platform. The positioning head is coaxially mounted on the central guide post. The cooperation of the central guide post and the central through-hole enables the positioning and installation of the support seat on the support platform, resulting in a simple structure that is easy to assemble. Simultaneously, the central guide post ensures stable installation of the positioning head on the positioning seat.

[0007] The bottom end of the support base is recessed upwards, forming a positioning cavity that mates with the support platform. The support platform is embedded within this positioning cavity. This precise positioning of the support base on the support platform, achieved through the engagement of the positioning cavity and the support platform, allows for a reduction in the required precision of the fit between the central through hole and the central guide post, thereby lowering manufacturing costs.

[0008] The support platform and the support base are detachably fixedly connected. The support base can be replaced with different pulley specifications, improving versatility.

[0009] The support platform is provided with mounting screw holes, and the support base is coaxially provided with mounting holes at the corresponding positions. A bolt or screw that mates with the mounting screw holes passes through the mounting holes and is screwed into the corresponding mounting screw holes, thus achieving a detachable connection between the support platform and the support base. This detachable structure is simple and easy to install and disassemble.

[0010] The annular support wall protrudes upwards onto the support base, causing the upper surface of the support base to be recessed to form a recessed cavity. The central lower protrusion of the pulley hub extends into this recessed cavity. During positioning and installation, the bottom surface of the central lower protrusion of the hub does not contact the bottom surface of the recessed cavity. The recessed cavity provides an installation space for the central lower protrusion of the hub. During positioning, the central lower protrusion does not contact the recessed cavity, allowing the hub to be suspended and unloaded. This suspension prevents over-positioning. When the hub is suspended and the part is in place, it ensures that it is positioned by the gear ring. If the hub is in contact, it is impossible to determine whether the positioning is by the hub or the gear ring after the part is positioned.

[0011] The support base is provided with vertically extending weight-reducing holes. While ensuring the support strength, the weight-reducing holes are used to reduce the overall weight.

[0012] The weight-reducing holes are multiple and evenly distributed to achieve a uniform force distribution.

[0013] Compared with the prior art, the advantages of this utility model are: simple structure, and the ring support wall set on the support base is used to form a stable support for the toothed ring with the balance hole when the pulley is drilled for auxiliary positioning, thereby effectively preventing the toothed ring from deforming and improving the product qualification rate. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0015] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0016] Figure 3 This is a cross-sectional view of the support base in this utility model;

[0017] Figure 4 A cross-sectional view of the pulley adapted for auxiliary positioning in this utility model;

[0018] Figure 5 A partial cross-sectional view of the structure of the matching pulley installed on this utility model. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0020] As shown in the figure, a drilling auxiliary positioning fixture for a pulley includes a positioning seat 1, a positioning head 2 and a support seat 3. The positioning head 2 is used to extend into the center hole A11 of the hub A1 of the pulley A to achieve overall positioning and installation of the pulley A. The support seat 3 is provided with an annular support wall 31 for supporting the bottom end face of the toothed ring A2 of the pulley A.

[0021] In this specific embodiment, a support platform 11 is provided on the positioning base 1, and a central guide post 12 is provided on the support platform 11 with an upward protrusion. The support base 3 is sleeved on the central guide post 12 through a central through hole 32 and fixedly installed on the support platform 11. The positioning head 2 is coaxially installed on the central guide post 12. Through the cooperation of the central guide post 12 and the central through hole, the positioning installation of the support base 3 on the support platform 11 is realized. The structure is simple and easy to assemble. At the same time, the central guide post 12 realizes the stable installation of the positioning head 2 on the positioning base 1.

[0022] In this specific embodiment, the bottom end of the support base 3 is recessed upwards and has a positioning cavity 33 that mates with the support platform 11. The support platform 11 is embedded in the positioning cavity 33. By fitting the positioning cavity 33 and the support platform 11 together, the installation position of the support base 3 on the support platform 11 is further accurately positioned. Therefore, the requirement for the fitting accuracy between the central through hole and the central guide post 12 can be appropriately reduced, thereby reducing manufacturing costs.

[0023] In this specific embodiment, the support platform 11 and the support base 3 are detachably fixedly connected. The support base 3 can be replaced based on different pulley specifications, improving versatility.

[0024] In this specific embodiment, the support platform 11 is provided with mounting screw holes 111, and the support base 3 is provided with mounting holes 34 coaxially at the corresponding positions of the mounting screw holes 111. A bolt or screw (not shown in the figure) that mates with the mounting screw holes 111 passes through the mounting holes 34 and is screwed into the corresponding mounting screw holes 111, thus achieving a detachable connection between the support platform 11 and the support base 3. The above-mentioned detachable structure is simple and easy to install and disassemble.

[0025] In this specific embodiment, the annular support wall 31 protrudes upwards onto the support base 3, causing the upper end face of the support base 3 to be recessed to form a recessed cavity 35. The central lower protrusion A12 of the hub A1 of the pulley A extends into the recessed cavity 35. During positioning and installation, the bottom end face of the central lower protrusion A12 of the hub A1 does not contact the bottom end face of the recessed cavity 35. The recessed cavity 35 provides an installation space for the central lower protrusion of the hub A1. During positioning, the central lower protrusion A12 does not contact the recessed cavity 35, making the hub A1 suspended and unloaded. This suspension and unloaded state of the hub A1 prevents over-positioning. When the suspended part of the hub A1 is in place, it can be ensured that it is positioned by the toothed ring A2. If the hub A1 is in contact, after the part is positioned, it is impossible to determine whether it is the hub A1 or the toothed ring A2 that is positioned.

[0026] In this specific embodiment, the support base 3 is provided with a vertically penetrating weight-reduction hole 36. While ensuring the support strength, the weight-reduction hole 36 is used for overall weight reduction.

[0027] In this specific embodiment, there are multiple weight-reducing holes 36, which are evenly distributed to achieve uniform force distribution.

Claims

1. A drilling-assisted positioning fixture for a pulley, comprising a positioning seat, wherein a positioning head and a support seat are provided on the positioning seat, and the positioning head is used to extend into the center hole of the pulley hub to achieve overall positioning and installation of the pulley, characterized in that... The support base is provided with an annular support wall for supporting the bottom end face of the toothed ring of the pulley.

2. The auxiliary positioning fixture for drilling a pulley as described in claim 1, characterized in that... The positioning seat is provided with a support platform, and a central guide post is provided on the support platform. The support seat is sleeved on the central guide post through a central through hole and fixedly installed on the support platform. The positioning head is coaxially installed on the central guide post.

3. The auxiliary positioning fixture for drilling a pulley as described in claim 2, characterized in that... The bottom end of the support base is recessed upwards and has a positioning cavity that mates with the support platform. The support platform is embedded in the positioning cavity.

4. The auxiliary positioning fixture for drilling a pulley as described in claim 2, characterized in that... The support platform and the support base are detachably fixedly connected.

5. The auxiliary positioning fixture for drilling a pulley as described in claim 4, characterized in that... The support platform is provided with mounting screw holes, and the support base is provided with mounting holes coaxially at the positions corresponding to the mounting screw holes. The detachable connection between the support platform and the support base is achieved by passing a bolt or screw that mates with the mounting screw holes through the mounting holes and screwing it into the corresponding mounting screw holes.

6. The auxiliary positioning fixture for drilling a pulley as described in claim 1, characterized in that... The annular support wall protrudes upward on the support base, causing the upper end face of the support base to be recessed to form a cavity. The lower central protrusion of the pulley hub extends into the cavity. During positioning and installation, the bottom end face of the lower central protrusion of the hub does not contact the bottom end face of the cavity.

7. The auxiliary positioning fixture for drilling a pulley as described in claim 1, characterized in that... The support base is provided with a weight reduction hole that runs vertically through it.

8. The auxiliary positioning fixture for drilling a pulley as described in claim 7, characterized in that... The weight-reducing holes are multiple, and all of the weight-reducing holes are arranged in a manner consistent with each other.

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