JPS62118141A - Differential gear having slip limiting function - Google Patents

Abstract

PURPOSE:To improve performance and safety, by designing pinions and side gears to also function as a gear pump, and braking the operation of the pump by the flow resistance of a fluid to be pumped by the gear pump. CONSTITUTION:Pinions 3 and 4 having fixed shafts 1 and 2 are meshed with side gears 5 and 6, and a solid structure is formed at areas other than the space where the gears are rotated. With this structure, the pinions 3 and 4 and the side gears 5 and 6 may be designed to also function as a gear pump, and the pump may be braked by the flow resistance of a fluid to be pumped. Accordingly, a maximum rotational speed of the pinions 3 and 4 may be limited, thereby improving the performance and the safety.

Description

[Detailed Description of the Invention] This invention provides a difference in driving torque between the left and right wheels of an automobile, which limits the difference in rotational speed between the left and right axes from becoming extremely large, and maintains the drive torque of one axle. It is related to moving gears.

Conventional differential gears have the disadvantage that when the frictional force between the wheels connected to one shaft and the road surface decreases, or when the wheels jump off the road surface and spin, the other shaft also loses driving force. There is.

Various inventions have been made to improve the above, but the purpose of the present invention is to eliminate the above drawbacks and provide a highly reliable slip-limiting function using principles and structures different from those methods. Our goal is to provide moving gears at low cost.

The present invention allows the pinion and side gear of a conventionally used differential gear to function as a gear type pump, and brakes the operation of the pump by the flow resistance of the fluid pumped by the pinion and side gear. FIG. 1 is a diagram for explaining the present invention in detail, and is a differential gear whose main feature is to limit the maximum speed of rotation of the pinion. This diagram is based on the diagram commonly used to explain the basic principle, and shows the rotation of the differential case and the rotation of the left and right side gears as linear motion. ○To explain this configuration, the differential case are not shown in their entirety in the figure, but pinions (3) and (4) with shafts (1) and (2) fixed to them
) meshes with the side gears (5) and (6), and a part of the differential case, which was manufactured as a solid structure except for the space in which these gears rotate, is shown as a block (
7) It is expressed as a closed line. When the zero pinion, which is filled with viscous fluid, rotates, it works as a gear type pump in combination with the side gear, so the block (force) Suction port and discharge port (7a) as a pump (
7b) and a pipe (7C) connecting them,
(7a) (7b)
A structure lacking 7c) may also be used.

In this figure, if the rotation of the differential case is expressed as upward movement, the pinions (3) and (4) with shafts (1) and (2) fixed to the differential case will move side gears (5) and (6). ), the pinions (3) and (4) will rotate, and the side gears (5) and (
6), the arithmetic mean of the moving speed is the pinion axis (
1) It is possible to do different things while maintaining the relationship of being equal to the moving speed in (2). At this time, pinion (3)
(4) and the side gears (5) and (6) function as gear-type pumps, and depending on the direction of rotation of the pinion, the suction port and discharge port are reversed (7a) and (7b). However, the enclosed fluid is connected to the connecting pipe (7).
In addition to circulating through C), the flow resistance of the pumping circulating flow including this leakage flow is approximately Proportional to the flow velocity, but not strictly proportional, as the flow velocity increases, the resistance increases 0 Therefore, as the rotational speed of the pinion increases, the resistance increases, so the rotational speed of the pinion increases indefinitely. An example based on the above principle will be explained with reference to Figs. 2 and 6. In this case, there are two pinions, and Fig. 2 shows the side gear shaft (10)←υ and the pinion shaft (1). (
2), Fig. 3 is a cross-sectional view on a plane including the center line of the side gear shaft, and perpendicular to the pinion axis. Although the connecting pipes do not appear in Figures 2 and 3, it can be understood that they are installed at appropriate locations according to Figure 1, or that they are not installed with the intention of utilizing only the leakage flow. It's okay. In any case, pinion (3) (4
) and side gear (51(6)), if there is a connecting pipe including the rotating space, suction port, and discharge port, therein,
Encloses viscous fluid.

When the differential case (8) driven by the power shaft (9) rotates and the loads on the left and right shafts are equal, the pinion (3)
(4) does not rotate, side gear (5) (6
) rotates together with the differential case to drive the left and right wheels, but does not have a pumping effect.If the wheel spins due to a decrease in the road vibration force of the single-axle wheel, or due to jumping, etc.
Both the pinion and side gear try to rotate at high speed inside the differential case, but as the pumping resistance increases as a gear type pump, the speed does not exceed the maximum speed depending on the power torque driving the differential case. . Therefore, although the rotational speed of the non-idling shaft decreases due to the basic principle of differential gears, it does not lose its driving torque. The relationship between the magnitude of the power torque that drives the differential case and the maximum rotational speed of the pinion is based on the dimensions of the pinion and side gear as a gear-type pump, including the dimensions of the tooth tip and side clearances, the suction port, and the discharge port. These values are determined by the diameter and length of the connecting pipe, the viscosity of the fluid used, etc., so determine these values through experiments depending on the amount of power to be transmitted and the purpose of use. When traveling around curves, the rotational speed of the pinion is low, so the rotational resistance of the pump is small and does not cause any trouble.As explained above, the present invention automatically prevents the idling of one shaft. The function of limiting the drive torque of the other shaft and maintaining the drive torque of the other shaft can be obtained without increasing production costs compared to ordinary differential gears, so it is suitable for use in almost all automobile differential gears. It has the effect of improving performance and safety.

[Brief explanation of drawings]

FIG. 1 is a detailed explanatory diagram of the present invention,
In a differential gear, the rotation of the differential case and the rotation of the side gear are expressed as vertical linear motion. 2 and 6 are cross-sectional views of an embodiment of the present invention, and FIG. 2 is a plane including the center lines of the side gear shaft (10) (1υ and pinion shafts (1) and (2), respectively). Fig. 6 is a sectional view taken on a plane that includes the side gear shaft center line and is perpendicular to the pinion axis.

Claims (1)

[Claims] The interior of the differential case has a solid structure except for the space where the pinion and side gear rotate, and a gear type pump consisting of a pinion and side gear is used to resist the flow of fluid that is pumped or circulated by leakage. A differential gear with a slip limiting function.