JPS6364545A - Rectifier structure of vehicle generator - Google Patents

Abstract

PURPOSE:To improve cooling efficiency and to reduce noise, by a method wherein a frame rod arranged at downstream side of a cooling air path of a radiator is biased at its outside edge towards side of axial core with respect to outside edge of the radiator. CONSTITUTION:A vehicle generator 1 is composed of a rotor core 3 press-fitted and fixed to a core shaft 2, a coil bobbin 4, a rotor coil 5, a stator 6, a brush 7 enclosed in a brush holder 7a, a slip ring 8, a rectifier 9 and the like. The rectifier 9 is mounted to a side plate 10 at lateral side of the rotor core 3 together with other members such as the brush holder 7a, a regulator, and cooled by the cooling fan 3a. The rectifier 9 is also provided with an insulation substrate and a pair of radiators, and the insulation substrate is disposed adjacent to downstream side of a cooling air path of the radiator. A frame rod of the insulation substrate is biased at its outside surface towards side of axial core with respect to outside surface of the opposed radiator. As a result, the arrangement structure does not obstruct the cooling air, and the cooling is performed efficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rectifier structure for a vehicle generator installed in a vehicle such as a passenger car, bus, truck, or motorcycle.

[Prior Art and Problems to be Solved by the Invention] Generally, this type of vehicle generator is provided with a rectifier that rectifies the generated alternating current into direct current. Regarding this rectifier as well, the challenge is how to efficiently control the ventilation conditions for cooling air as a countermeasure against internal temperature rise, and how to meet the recent demands for higher performance. Moreover, the rectifier is placed in the cooling air path generated by the operation of the cooling fan installed in the rotor core, and receives the cooling effect, and is designed using a heat radiator and an insulating base material on the downstream side of the cooling air path. However, conventionally, the insulating base material has been disposed approximately on the same line as the heat sink, and has been hidden behind the heat sink in the rotor core axial direction. However, cooling air flows from the case bracket toward the rotor core in a slight swirl in the axial direction due to the operation of the cooling fan. This tendency is stronger when the cooling fan itself is made smaller, so when viewed from this air path, the insulating base material is not hidden in the shadow of the heat radiator as shown in Figure 7, and the cooling air flows through it. As a result, the cooling air is unnecessarily disturbed, which not only significantly reduces the internal cooling efficiency but also causes problems such as the generation of noise.

[Means for Solving the Problems] The present invention was devised in view of the above-mentioned circumstances with the aim of providing a rectifier structure for a vehicle generator that can solve these problems. A rectifier that rectifies the generated alternating current is arranged in a cooling air path generated by the operation of a cooling fan installed in the rotor core, and a pair of heat radiators are arranged in parallel inside and outside the rotor core axis, and these heat radiators It is placed on the lower side of the cooling air path,
and an insulating base material having a frame rod facing each heat radiator, and the outer edge of each frame rod is biased toward the rotor core axis side than the outer edge of the opposing heat radiator. It is characterized by being set as follows.

According to the present invention, with this configuration, disturbance of cooling air due to the insulating base material can be prevented as much as possible, thereby improving cooling efficiency and reducing noise.

[Embodiment 1] Next, an embodiment of the present invention will be explained based on the drawings. In the drawings, l is a generator for a vehicle, and the generator 1
A rotor core 3 of a so-called Randall type press-fitted onto the core shaft 2, a coil bobbin 4 housed inside the rotor core 3,
A rotor coil 5 wound around a coil bobbin 4, a stator 6 around which a stator coil 6a is wound, a brush 7 held elastically in a brush holder 7a, a slip ring 8 with which the brush 7 comes into sliding contact, and a generated alternating current. It is the same as before that it is constructed of various members such as a rectifier 9, which will be described later, that rectifies the current.

The rectifier 9 is attached to a ring plate-shaped side plate 10 provided on the side of the rotor core 3 together with other members such as a brush holder 7a and a regulator 11, and operates the cooling fan 3a provided in the rotor core 3. It is placed in the air path of the cooling air generated by the
The rectifier 9 was provided with a terminal plate 19.20, which will be described later, to which a bolt 12 passes through and a lead wire 16 extending from a diode chip buried in an open heating element 14.15, which will be described later, is connected to both ends of the rectifier 9. A pair of positive side heat radiator 14 and negative side heat radiator 15 are mounted on an insulating base material 13 and supported by bolts 12 with both ends insulated by an insulator (insulating material) 17. These are attached to the bolts 12 by lynching both ends of the insulating base material 13, both ends of the positive heat radiator 14, the insulator 17, and both ends of the negative heat radiator 15 in this order. By assembling the open heat body 14.15 in parallel with the inside and outside of the axis N of the rotor core 2, and the insulating base material 13 is adjacent to the cooling air path downstream side of the heat dissipation body 14.15. It is configured to be located at

The insulating base material 13 has groove-shaped support portions 1 on both ends of which the flange portion 12a of the mounting bolt 12 is applied and supported.
3b, and the bolt 12 is attached from the support part 13b to 3al.
& the cylindrical guide 13a and both support parts 13
b, and is formed into a link frame shape by a pair of frame rods 13c and 13d facing each of the heat radiators 14 and 15, respectively. Terminal plates 19.20 are provided on the opposing frame rods 13d, and the ends of lead wires 16 extending from the buried diode chips are connected to and branched off from each heat sink 14.15. Here, among the terminal boards, the middle terminal board 20 is a terminal board for the neutral point, and by providing this terminal board on the middle side without providing it at either the left or right end, the heat sink 14.15 The heat generating area is divided into left and right sides to further improve cooling efficiency.

The frame rods 13c and 13d are both set to have a length <(A>B) in the direction of the cooling airflow path, and their corners are chamfered to form an elliptical shape. The width B is set to be slightly smaller than the width C of the heat sink 14.15 (B<C). There is. And which frame rods 13c, 13
d is also biased toward the rotor axis N side with respect to the center lines n, , n2 of the opposing heat sinks 14, 15, but the bias amount δ1
, δ2 are set so that the frame rod 13c facing the positive side heat radiator 14 on the axis side is smaller than the frame rod 13d facing the negative side heat radiator 15 (δ1 × δ2), Due to stiffness, both frame rods 13c and 13d
Cooling fins 14a, 15 provided on the heat sink 14.15
Frame rod 1 within a range that does not go beyond the range of a.
The outer edges of 3c and 13d are biased toward the axis N side relative to the outer edges of the opposing heat radiators 14 and 15, and the amount of the bias is smaller than that of the frame facing the inner side, that is, the positive side heat radiator 14. The rod 13c is set to be smaller.

In the embodiment of the present invention configured as described above, alternating current is generated by the rotation of the rotor core 3 as the engine is driven, and this is rectified into direct current by the rectifier 9 and drawn out. The disturbance of the cooling air caused by the insulating base material 13 is reduced, and efficient cooling can be performed.

That is, in the present invention, the insulating base material 13 is disposed on the downstream side of the cooling air path of the rectifier 9, but the frame rods 13c and 13d are both heat sinks 14 and 15 whose outer surfaces face each other. It is biased toward the axial center side rather than the outer surface. As a result, the arrangement structure of the outer surfaces of the heat sink 14, 15 and the frame rods 13c, 13d is arranged along the flow of the spiral cooling air that enters from the case bracket 1a due to the operation of the cooling fan 3a. Therefore, when viewed from the flow of cooling air, the frame rods 13c and 13d are located at positions hidden in the shadows of the opposing heat radiators 14 and 15, respectively. Therefore, the direct disturbing effect of blocking the cooling air by the frame rods 13c and 13d is prevented as much as possible, which makes it possible to perform an efficient cooling effect and suppress the generation of noise. . Moreover, in this device, the amount of deviation of each of the outer edges of the frame rods i3c and 13d is set so that the inner one is smaller, and the vortex flow of cooling air, that is, the outer edge is directed toward the axis center. Since the inclination is such that the inside side is oriented more toward the axis, it follows the flow of air, which further prevents turbulence of the cooling air and avoids noise generation.

Furthermore, since the corners of the frame rods 13c and 13d are all chamfered, this has the effect of further reducing the disturbance of the cooling air. Rod 13c, 13
Since the thickness of d satisfies A>B, it is possible to ensure sufficient strength even if the overall thickness is thin in the axial direction, which is convenient.

[Operations and Effects] In summary, since the present invention is constructed as described above, the frame rod disposed on the downstream side of the cooling air path of the heat radiator has an outer edge that is closer to the axis than the outer edge of the heat radiator. It is biased to the side, and when viewed from the side, the spiral flow of cooling air appears to be hidden in the shadow of the heat sink, so the flow of cooling air is blocked by the frame rods as in the past. This means that disturbances and disturbances can be prevented as much as possible. This not only greatly improves the internal cooling efficiency of the cooling air and greatly contributes to improving the performance of the generator, but also suppresses noise generation to the utmost, making it even quieter.

[Brief explanation of drawings]

The drawings show an embodiment of the rectifier structure for a vehicle generator according to the present invention, and FIG. 1 is a partially cutaway side view of the vehicle generator, and FIG. 2 is a side plate assembly. 3 is a rear view of the same, FIG. 4 is a side view of the same, and FIG. 5 is a front view showing the state. Y and Z are the top view, bottom view, and front view of the insulating base material, respectively.
Figure 6 is a cross-sectional view of the main parts of the rectifier,
FIG. 7 is an action explanatory diagram showing a conventional example. In the figure, 1 is a generator, 3a is a cooling fan, 9 is a rectifier, 13 is an insulating base material, 13c and 13d are frame rods, 1
4.15 is a heat sink. Patent Issued by Mitsuba Electric Co., Ltd. Figure 2 15 15a IJC13d'', 5 Figure 5 Figure 6

Claims (1)

[Claims] 1) A rectifier that rectifies the generated alternating current,
A pair of heat radiators are arranged in the cooling air passage generated by the operation of the cooling fan provided in the rotor core, and are arranged in parallel inside and outside the rotor core axis. an insulating base material having a frame rod facing the heat radiator, and the outer edge of each frame rod is biased toward the rotor core axis side than the outer edge of the opposing heat radiator. A rectifier structure for a vehicle generator characterized by: 2) The power generation for a vehicle according to claim 1, wherein the offset amount of each frame rod is set such that the inner frame rod is smaller than the outer frame rod. Rectifier structure of the machine.