JPH0448242B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a governor device that provides governor pressure for switching shift valves in an automatic transmission.

(Prior Art) As a conventional governor device, the one shown in FIGS. 3A to 3C is known.
No. 200645, reference).

In FIGS. 3A to 3C, 1 is a shaft serving as a governor body, and a governor spool 3 is fitted into a spool hole 2 formed in the shaft 1 so as to be slidable in the axial direction. Further, a gear 13 is provided on the outer periphery of the lower end of the shaft 1, and is meshed with a gear of an output rotation transmission section from an automatic transmission to the wheels, and rotates the shaft 1 according to the rotation speed of the wheels. Incidentally, FIGS. 3A to 3C show a state in which the shaft 1 is in a medium speed rotation region.

A box-shaped support 16 that opens left and right is fixed to the upper side of the shaft 1, and a pair of governor pins 6 are inserted between the opposing sides of the support, and both ends are crushed with caulking etc. to prevent them from coming out. supports one end of each of the secondary weight 4 and primary weight 5, and each of the pair of weights, that is, the pair of secondary weight 4 and primary weight 5, has the same shape and the same plate thickness, and the weight balance is maintained with respect to each other. It is formed in a leaning manner and is rotatably mounted with the governor pin 6 as a swing axis. Secondary weight 4
A spring 11 for setting a load is provided at a length l1 from the central axis of the governor pin 6 between the support part 4a integrally molded with the primary weight 5 and the support part 5a integrally molded with the primary weight 5. The primary weight 5 and the secondary weight 4 are linked to each other via the spring 11 in response to the centrifugal force generated with rotation, and the governor pin 6
The governor spool 3 is pushed downward by swinging in the direction of expanding outward using the swing axis.

Curve X in FIG. 2 is a graph showing the characteristics of the conventional example shown in FIGS. 3A to 3C.

Referring to FIG. 2 and focusing on only one of the pair of weights, for example, the secondary weight 4 and the primary weight 5 located on the right side, we will explain how to adjust the governor pressure as the governor spool 3 moves. A predetermined hydraulic pressure is applied to the chamber 7, and when the car starts moving and the shaft 1 starts rotating, the primary weight 5 swings outward due to centrifugal force, pushing the governor spool 3 downward, thereby opening the entrance chamber. 7 is communicated with the pressure regulating chamber 8 to supply liquid pressure to the pressure regulating chamber 8. Pressure control chamber 8 is orifice 9
The inlet chamber 7 and the pressure regulating chamber 8 are
The fluid pressure in the pressure regulating chamber 8 is increased while the communication state with the pressure regulating chamber 8 is interrupted. This increase in hydraulic pressure exhibits an increase characteristic up to a predetermined pressure determined by the set load of the spring 11, as shown in section a1 of curve a in FIG.

Furthermore, when the rotational speed of the shaft 1 increases, the secondary weight 4 swings outward due to the increase in centrifugal force, pushing the governor spool 3 further downward and causing the pressure regulation chamber 8 to
The pressure in the pressure regulating chamber 8 is further increased as shown in part a2 of curve a in FIG.

Here, since a pair of weights (a pair of secondary weights 4 and a pair of primary weights 5) are acting on the top of the governor spool 3, the pressure in the pressure regulating chamber 8 is twice that of curve a. An increasing characteristic shown by the curve X (X=a+a) is obtained. The hydraulic pressure in the pressure regulating chamber 8 is applied to the shift valve system of the automatic transmission via the outlet chamber 12.

(Problems to be Solved by the Invention) However, as is clear from the curve X in FIG. 2, as the governor rotation speed increases, the governor pressure generated in the pressure regulating chamber 8 increases exponentially.
In order to obtain the optimum shift characteristics suitable for the vehicle, the second
If an attempt is made to maintain a certain degree of hydraulic gradient in the rotation range slightly above N1 of the curve There was a problem that it could not be used for speed change control.

(Means for solving the problems) The present invention has been made in view of the above problems, and
It has a high degree of design freedom to ensure the hydraulic slope necessary to control shift characteristics over the entire rotation range from low rotation to high rotation, and to obtain the optimal hydraulic characteristics for various automatic transmissions for vehicles. The purpose is to provide a governor device.

In order to achieve this object, the present invention fixes a support member to the shaft end of a rotary shaft incorporating a spool that is slidable in the axial direction, and attaches a pair of support members to the support member that swings outward around a governor pin by centrifugal rotation. In the governor device, a weight is provided, and a force due to the swinging of the weight and a biasing force of a spring that biases the spool in the pushing direction are applied to the spool. In addition, the springs are provided at different distances from the central axis of the governor pin.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 is a sectional view showing an embodiment of the present invention.

First, the configuration will be described. Reference numeral 1 denotes a shaft serving as a governor body, and a spool hole 2 is formed in the shaft 1. Spool 3 is in this spool hole 2.
is attached so that it can slide freely in the axial direction. Further, a gear 13 is provided on the outer periphery of the lower end of the shaft 1, and is meshed with a gear provided in the output rotation transmission section of the automatic transmission, and rotates the shaft 1 according to the number of rotations of the wheels and therefore the vehicle speed. . Note that FIG. 1 shows a state in which the shaft 1 is in a medium speed rotation region.

A box-frame-shaped support 16 that opens left and right is fixed to the shaft end of the shaft 1, which is the upper side of the governor body.
A pair of governor pins 6 are inserted between the opposing support sides 16a and are crushed by caulking or the like at both ends to prevent them from coming out, and each governor pin 6 has a corresponding weight rotatably supported. To explain specifically, the first
The weight located on the right side of the diagram is
Each of the secondary weight 4 and the primary weight 5 is swingably mounted around a governor pin 6 as a swing axis. A spring 11 for setting a load is provided between a support portion 4a integrally molded on the secondary weight 4 and a support portion 5a integrally molded on the primary weight 5 at a position of length l1 from the central axis of the governor pin 6. , the primary weight 5 and the secondary weight 4 are linked to each other via the spring 11 in response to the centrifugal force generated as the shaft 1 rotates, and the governor pin 6 is used as a swing axis to swing in the direction of expanding outward. Push spool 3 downward.

Next, to explain the weights located on the left side of FIG. 1, the secondary weights 14 and primary weights 15 have different shapes and plate thicknesses from the secondary weights 4 and primary weights 5 located on the right side.
is pivotally supported as a pivot shaft. Support part 14 integrally molded with secondary weight 14
A and a support part 15a integrally formed on the primary weight 15, a spring 11 for setting a load is set at a length l2 from the central axis of the governor pin 6 (different from the above l1, and in the embodiment l2>l1 The primary weight 15 and the secondary weight 14 are connected to each other via the spring 11 in response to the centrifugal force generated as the shaft 1 rotates, and the governor pin 6
The spool 3 is swung outward using the spool 3 as a swiveling axis, and the spool 3 is pushed downward.

The weight 15 located on the left side is formed thinner than that of the weight 5 located on the right side, and is provided with a hole 15a for weight reduction. Therefore, the weight of the left weight 15 is set to be lighter than that of the right weight 5, so the shaft 1
The swinging load on the weight 15 due to the centrifugal force generated by the rotation of the weight 15 is reduced.

Further, the distance l2 of the spring 11 located on the left side from the central axis of the governor pin 6 is set longer than the distance l1 of the spring installed on the right side. Therefore, the biasing force of the left spring 11 that biases the governor spool 3 in the pushing direction is smaller than that of the right spring 11.

Reference numeral 7 denotes an inlet chamber to which line hydraulic pressure is applied, and when the spool 3 is pushed downward, the inlet chamber 7 is communicated with the pressure regulating chamber 8, and hydraulic pressure is supplied to the pressure regulating chamber 8.
The pressure regulating chamber 8 is open to the pressure chamber 10 via an orifice 9, and by returning the liquid pressure of the pressure regulating chamber 8 to the pressure chamber 10 in the direction of pushing up the spool 3,
The fluid pressure in the pressure regulation chamber 8 is increased while the inlet chamber 7 and the pressure regulation chamber 8 are kept in communication with each other. The hydraulic pressure in the pressure regulating chamber 8 is applied to the shift valve system of the automatic transmission via the outlet chamber 12.

FIG. 2 is a graph showing the characteristics of the governor pressure with respect to the governor rotation speed in the embodiment shown in FIG. 1 in comparison with the conventional example.

The operation of the present invention will be explained with reference to FIG.

First, one of the pair of weights,
For example, to explain the operation focusing only on the secondary weight 4 and primary weight 5 located on the right side of Fig. 1, when the car starts moving and the shaft 1 starts rotating, the primary weight 5 is swayed in the direction of expanding outward due to centrifugal force. By moving the spool 3 downward, the inlet chamber 7 becomes the pressure regulating chamber 8.
and starts hydraulic pressure control in the pressure regulating chamber 8, and the governor rotational speed N1 increases as shown in part a1 of curve a in Fig. 2.
When , the governor pressure P2 shows a predetermined rising characteristic.

Furthermore, as the rotational speed of the shaft 1 increases, the secondary weight 4 swings in the direction of expanding outward due to the increase in centrifugal force, pushing the spool 3 further downward,
The hydraulic pressure in the pressure regulating chamber 8 is controlled, and the curve a in FIG.
It shows a predetermined increase characteristic in which the governor pressure becomes P7 when the governor rotation speed is N3 as shown in part a2 of FIG.

Next, we will explain hydraulic control by focusing on the other weights, that is, the secondary weight 14 and the primary weight 15 located on the left side of Fig. 1. Even when the car starts moving and the shaft 1 starts rotating, the other weight 15 is set to be thinner and lighter in weight, the swinging load of the primary weight 15, which swings due to the centrifugal force generated by the rotation of the shaft 1, is small, and the right spring 11 and Since the position is l1 < l2,
Since the pressing force against the governor spool 3 is small, it exhibits a low rising characteristic. That is, curve b in FIG.
As shown in part b1 of , when the governor rotation speed is N2, the governor pressure shows a gentle increase characteristic such that the governor pressure becomes P1 (P1<P2).

Furthermore, even if the rotational speed of the shaft 1 increases and the centrifugal force increases, as shown by b2 of curve b in FIG. 2, when the governor rotational speed is N3, the governor pressure will rise to P4.

Here, since a pair of weights are acting on the top of the spool 3, the rise in fluid pressure obtained from the outlet chamber 12 is due to the rise characteristic curve a due to the weight located on the right side and the rise characteristic curve a due to the weight located on the left side. Curve Y (a+b) which is the sum of the rising characteristic curve b
The rise characteristic shown in is obtained. That is, as shown in FIG. 2, the governor rotational speed exhibits a gentle increasing characteristic with inflection points at two points, N1 and N2.

Incidentally, in the above embodiment, the position of the spring 11 is set to l1<l2, but it can also be set to l1>l2, thereby dramatically increasing the degree of freedom in designing the governor pressure characteristics.

(Effects of the Invention) As described above, according to the present invention, a support member is fixed to the shaft end of a rotary shaft having a built-in spool that can freely slide in the axial direction, and a governor pin is attached to the support member by centrifugal rotation. In a governor device, a pair of weights that swing outward are provided, and a force generated by the swinging of the weights and a biasing force of a spring that biases the spool in the pushing direction are applied to the spool. By making the thickness of one plate different from that of the other and by providing the springs at different distances from the central axis of the governor pin,
The shift valve switching operation can be optimally set with high precision and smoothly according to the vehicle speed over the entire range from low speeds to high speeds, which has the effect of greatly improving the reliability and design freedom of the governor device. can get.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the present invention, Fig. 2 is a graph showing the characteristics of the governor pressure with respect to the governor rotation speed shown in Fig. 1 in comparison with the conventional example, and Figs. 3 A to C are FIG. 2 is a sectional view showing a conventional example. 1...Shaft (governor body), 2...Spool hole, 3...Spool, 4, 14...Secondary weight, 5, 15...Primary weight, 6...Governor pin, 7...Entrance chamber, 8... Pressure regulation chamber, 9... Orifice, 10... Pressure chamber, 11
...Spring, 12...Exit chamber, 16...Support.

Claims (1)

[Scope of Claims] 1. A support member 16 is fixed to the shaft end of a rotary shaft 1 containing a spool 3 that is slidable in the axial direction, and the support member 16 is provided with a structure that swings outward around a governor pin 6 by centrifugal rotation. The large and small weights 4, 5, 14, 15 and the spring 11 interposed between the large and small weights 4, 5, 14, 15 are placed on both sides of the axis of the rotating shaft 1. A governor device in which a force due to the swinging of the weights 4, 5 and 14, 15 and a biasing force of the spring 11 biasing the spool 3 in the pushing direction are applied to the spool 3. The weight of one of the weights 5 and 15 is made different from that of the other, and the distance from the central axis of the governor pin of the spring 11 located on the side of the weight 15 that is lighter is set to the distance from the central axis of the governor pin that is located on the side of the weight 5 that is heavier. A governor device characterized in that the distance is set longer than the distance of the spring 11.