Automobile generator belt pulley

Abstract

The utility model provides an automobile generator belt pulley which comprises a belt pulley shell and a core shaft which are connected through a one-way bearing, the core shaft is provided with a center hole, the center hole penetrates through the front end face and the rear end face of the core shaft, the center hole comprises a key hole part, a taper hole part and a containing hole part which are sequentially arranged from back to front, the key hole part is provided with a key groove, and the taper hole part is provided with a through hole. The large port of the taper hole part faces the key hole part, the diameter of the large port of the taper hole part is smaller than the aperture of the key hole part, and the aperture of the containing hole part is larger than the diameter of the small port of the taper hole part. In the utility model, the central hole of the belt pulley is provided with the taper hole part which is correspondingly and cooperatively assembled with the taper positioning part on the rotor shaft, and the hole surface of the taper hole part and the side surface of the taper positioning part are attached to form a conical surface centering structure, so that the centered assembly of the belt pulley and the rotor shaft is ensured, and the stable rotation of the generator rotor is further ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of pulleys, in particular to an automobile generator pulley. Background Art

[0002] The automobile generator pulley and the rotor shaft are key-connected. In order to improve the alignment between the pulley and the rotor shaft, a centering structure is provided between the pulley and the rotor shaft.

[0003] At present, the centering structure often adopts the following two structural methods. One of them is that when the pulley and the rotor shaft are connected with a flat key, a positioning hole is set in the center hole of the pulley to correspond to the positioning shaft on the rotor shaft. The positioning hole and the positioning shaft are matched and assembled to realize the centering assembly of the pulley and the rotor shaft. In order to facilitate assembly and disassembly, the positioning shaft and the positioning hole are assembled with a clearance fit. The existence of this clearance affects the centering effect of the pulley and the rotor shaft to a certain extent, resulting in certain noise and vibration during the rotation of the generator rotor.

[0004] Another structural type of centering structure is: when the pulley and the rotor shaft are spline-connected, the centering of the two is achieved directly through the spline connection structure. For the same reason, due to the gap between the spline hole of the pulley and the spline shaft of the rotor shaft, the two cannot be completely connected in a centering manner, resulting in certain noise and jitter during the rotation of the generator rotor. Utility Model Content

[0005] In view of this, the utility model aims to provide an automobile generator pulley to improve the assembly alignment of the automobile generator pulley and the rotor shaft and ensure the smooth rotation of the generator rotor.

[0006] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0007] A car generator pulley comprises a pulley housing and a core shaft connected by a one-way bearing, the core shaft is provided with a center hole, the center hole passes through the front and rear end surfaces of the core shaft, the center hole comprises a key hole portion, a tapered hole portion and a receiving hole portion arranged in sequence from back to front, the key hole portion is provided with a keyway, the large port of the tapered hole portion faces the key hole portion, and the large port diameter of the tapered hole portion is smaller than the aperture of the key hole portion, and the aperture of the receiving hole portion is larger than the small port diameter of the tapered hole portion.

[0008] Furthermore, a connecting hole portion is provided between the tapered hole portion and the accommodating hole portion, and the hole diameter of the connecting hole portion is smaller than the small port diameter of the tapered hole portion.

[0009] Furthermore, the taper of the tapered hole portion is 1:8.

[0010] Furthermore, the key hole portion is a spline hole structure.

[0011] Furthermore, the front end sleeve of the pulley housing has a sealing cover.

[0012] Furthermore, a convex ring protrudes from the rear end surface of the pulley housing, an annular space is formed between the convex ring and the core shaft, and an outer edge is provided at the end of the convex ring away from the pulley housing.

[0013] Compared with the prior art, the automobile generator pulley described in the utility model has the following advantages:

[0014] (1) In the utility model, the center hole of the pulley is provided with a tapered hole portion, which corresponds to and is assembled with the tapered positioning portion on the rotor shaft. The hole surface of the tapered hole portion and the side surface of the tapered positioning portion fit together to form a tapered centering structure, thereby ensuring that the pulley and the rotor shaft are assembled in a centering manner, thereby ensuring the smooth rotation of the generator rotor.

[0015] (2) In the utility model, a connecting hole portion is provided between the tapered hole portion and the receiving hole portion of the pulley. The hole diameter of the connecting hole portion is smaller than the small port diameter of the tapered hole portion and matches the outer diameter of the external thread portion of the rotor shaft, thereby increasing the effective contact area between the nut and the bottom of the receiving hole, thereby achieving a firm locking and fixing of the rotor shaft and the pulley.

[0016] (3) In the utility model, the convex ring and the outer edge of the rear end surface of the pulley housing are arranged to increase the heat dissipation area of ​​the pulley housing so as to dissipate the friction heat generated between the belt and the pulley in time, thereby preventing the pulley from aging and breaking due to long-term high heat, and allowing the generator to operate normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0018] Figure 1 This is a schematic diagram of the structure of an automobile generator pulley according to an embodiment of the utility model;

[0019] Figure 2 The present invention is a schematic diagram of the installation of an automobile generator pulley and a rotor shaft according to an embodiment of the present utility model.

[0020] Description of reference numerals:

[0021] 1-pulley housing; 11-convex ring; 12-outer edge; 13-groove; 2-one-way bearing; 3-core shaft; 31-key hole portion; 32-conical hole portion; 33-connecting hole portion; 34-accommodating hole portion; 4-sealing cover; 5-rotor shaft; 51-spline shaft portion; 52-conical shaft portion; 53-external threaded portion; 6-nut. DETAILED DESCRIPTION

[0022] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0023] like Figure 1 As shown, a car generator pulley comprises a one-way bearing 2, a pulley housing 1 and a core shaft 3. The pulley housing 1 is sleeved on the core shaft 3 through the one-way bearing 2. This structure is a common structure of a generator pulley and is not described in detail here. The core shaft 3 is provided with a center hole, which passes through the front and rear end faces of the core shaft 3. Along the direction from the rear end face to the front end face of the core shaft 3, the center hole comprises a key hole portion 31, a tapered hole portion 32, a connecting hole portion 33 and a receiving hole portion 34 which are arranged in sequence, wherein the key hole portion 31 is a spline hole structure, the large end of the tapered hole portion 32 faces the key hole portion 31, and the large end diameter of the tapered hole portion 32 is smaller than the aperture of the key hole portion 31, the connecting hole portion 33 tightly connects the tapered hole portion 32 and the receiving hole portion 34, the aperture of the connecting hole portion 33 is smaller than the small end diameter of the tapered hole portion 32, and the aperture of the receiving hole portion 34 is larger than the small end diameter of the tapered hole portion 32.

[0024] In the present invention, the tapered hole portion 32 provided in the center hole of the mandrel corresponds to the tapered shaft portion of the rotor shaft, and the aperture size relationship of the key hole portion 31, the tapered hole portion 32, the connecting hole portion 33 and the accommodating hole portion 34 facilitates the connection and fixation of the rotor shaft and the pulley. The assembly structure of the pulley and the rotor shaft 5 is as follows: Figure 2 As shown, the rotor shaft 5 is provided with a spline shaft portion 51, a tapered shaft portion 52 and an external thread portion 53 provided at the outer end of the rotor shaft 5, wherein the spline shaft portion 51 and the key hole portion 31 are assembled correspondingly to form a spline connection structure, the tapered shaft portion 52 and the tapered hole portion 32 are assembled correspondingly, the external thread portion 53 passes through the connection hole portion 33 and then extends into the accommodating hole portion 34, and the rotor shaft 5 and the pulley are locked and fixed by a matching nut 6. After assembly, the side surface of the tapered shaft portion 52 and the hole surface of the tapered hole portion 32 are closely fitted to form a tapered surface matching centering structure, ensuring that the rotor shaft 5 and the pulley are assembled in a centered manner, ensuring smooth power transmission, and making the generator rotor rotate smoothly.

[0025] In the present invention, the taper of the tapered hole portion 32 is preferably 1:8.

[0026] In the utility model, the front end sleeve of the pulley housing 1 is provided with a sealing cover 4 .

[0027] In the utility model, a convex ring 11 is protruded from the rear end face of the pulley housing 1, an annular space is formed between the convex ring 11 and the core shaft 3, an outer flange 12 is provided at one end of the convex ring 11 away from the pulley housing 1, and a distance is left between the outer flange 12 and the rear end face of the pulley housing 1, and a groove 13 is formed between the outer flange 12 and the rear end face of the pulley housing 1. This structure increases the heat dissipation area of ​​the pulley housing 1, improves the heat dissipation effect, dissipates the friction heat generated between the belt and the pulley in time, prevents the pulley from aging and breaking due to long-term high heat, and ensures that the generator can operate normally.

[0028] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An automobile generator pulley, comprising a pulley housing (1) and a core shaft (3) connected by a one-way bearing (2), wherein the core shaft (3) is provided with a center hole, and the center hole passes through the front and rear end surfaces of the core shaft (3), characterized in that: The central hole comprises a key hole portion (31), a tapered hole portion (32) and a receiving hole portion (34) which are arranged in sequence from back to front, the key hole portion (31) being provided with a key groove, the large port of the tapered hole portion (32) facing the key hole portion (31), and the large port diameter of the tapered hole portion (32) being smaller than the aperture of the key hole portion (31), and the aperture of the receiving hole portion (34) being larger than the small port diameter of the tapered hole portion (32).

2. The automobile generator pulley according to claim 1, characterized in that: A connecting hole portion (33) is provided between the tapered hole portion (32) and the accommodating hole portion (34), and the diameter of the connecting hole portion (33) is smaller than the small port diameter of the tapered hole portion (32).

3. The automobile generator pulley according to claim 1, characterized in that: The tapered hole portion (32) has a taper of 1:

8.

4. The automobile generator pulley according to claim 1, characterized in that: The key hole portion (31) is a spline hole structure.

5. The automobile generator pulley according to claim 1, characterized in that: The front end sleeve of the pulley housing (1) is provided with a sealing cover (4).

6. The automobile generator pulley according to claim 1, characterized in that: A convex ring (11) protrudes from the rear end surface of the pulley housing (1), an annular space is formed between the convex ring (11) and the core shaft (3), and an outer edge (12) is provided at the end of the convex ring (11) away from the pulley housing (1).

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