JPH0538282Y2 - - Google Patents

Description

[Detailed explanation of the idea]

(Field of Industrial Application) This invention relates to a governor device that provides governor pressure for switching shift valves in an automatic transmission. (Prior Art) In a conventional governor device of this type, for example, as shown in FIG. 5, a support member 3 is fixed to the shaft end of a rotating shaft 2 having a built-in governor spool 1 that is slidable in the axial direction. , a pair of weights 5 and 6 are provided on the support member 3 that swings outward around the governor pin 4 through centrifugal rotation, and the force due to the swinging of the weights 5 and 6 is applied to the top of the spool 1 to close the inlet. The chamber 7 is communicated with the pressure regulation chamber 8, fluid pressure is supplied to the pressure regulation chamber 8, and this fluid pressure is returned to the pressure chamber 9, thereby intermittent communication between the inlet chamber 7 and the pressure regulation chamber 8. It is known that the hydraulic pressure in the pressure regulating chamber 8 is increased to generate a governor pressure proportional to the rotation speed. In this case, the plug 11 is placed at the bottom of the spool hole 10.
is inserted, a set spring 12 is interposed inside the plug 11, and when rotating at low speed, for example,
The governor hydraulic pressure is raised in steps at 500 rpm. (Problems to be solved by this invention) However, in the case of such a conventional governor device, a plug is required to raise the governor hydraulic pressure in steps during low-speed rotation, and a plug is required in the spool hole. There was a problem that the depth had to be increased, which increased the cost. (Means for solving the problem) This invention was made in view of the above problem, and it is designed to maintain constant specification values of the primary weight, secondary weight, governor spool, boost spring, and break spring. It is an object of the present invention to provide a governor device having a predetermined break point function at low rotation speed by setting such a relationship. In order to achieve this purpose, this invention fixes a support member to the shaft end of a rotating shaft that has a governor spool that is slidable in the axial direction built into the spool hole, and centrifugally rotates the governor pin to the center of the support member. In the governor device, a boost spring is provided between a primary weight and a secondary weight that swing outward as a primary weight and a secondary weight, and a break spring is provided between the bottom of the spool hole and the shaft end of the spool. Specification values such as weight, governor spool, boost spring and break spring weight, spring force, etc. are set to have a constant relationship. (Function) In this invention, the primary weight,
Since the specifications of the secondary weight, governor spool (governor valve), boost spring, and break spring are set to have a certain relationship, a predetermined break point function can be achieved at low cost without the need for a plug. (Example) Hereinafter, an example of this invention will be described based on the drawings. FIG. 1 is a diagram showing an embodiment of this invention. First, to explain the configuration, in Fig. 1, 2
1 is the sleeve (rotating shaft) that becomes the governor body
, and the spool hole 2 formed in the sleeve 21
2 is fitted with a governor spool 23 so as to be slidable in the axial direction. Further, a gear 24 is provided on the outer periphery of the sleeve 21, and the gear 24 meshes with a gear of an output rotation transmission section from an automatic transmission to the wheel side, so that the sleeve 21 rotates according to the rotation speed of the wheel. do. A box-shaped support 25 that opens left and right is fixed to the upper side of the sleeve 21, and the opposing support sides 2
A pair of governor pins 26 are inserted between 5A and crushed by caulking at both ends to prevent them from coming off. Each governor pin 26 has one end of a secondary weight 27 and a primary weight 28 pivotally supported. Each of the weight 27 and the pair of primary weights 28 is rotatably mounted around the governor pin 26 as a rotation axis. A boost spring 29 is provided between a support part 27A integrally molded on the secondary weight 27 and a support part 28A integrally molded on the primary weight 28. The weight 28 and the secondary weight 27 are linked to each other via a boost spring 29, and are rotated about the governor pin 26 as a rotation axis in a direction expanding outward, thereby pushing the governor spool 23 downward.
In addition, the bottom of the spool hole 22 and the governor spool 2
A break spring 30 is interposed between the shaft end of 3 and the shaft end of 3. 31 is an inlet chamber to which a predetermined hydraulic pressure is applied;
The centrifugal force generated by the rotation of the sleeve 21 causes the primary weight 28 and the secondary weight 27 to rotate in a direction in which they expand outward, and the governor spool 2
3 to the lower side, the inlet chamber 31 is connected to the pressure regulation chamber 32, and the pressure regulation chamber 32 is connected to the communication path 33.
It communicates with the pressure chamber 34 via the pressure chamber 34, and controls the hydraulic pressure of the pressure regulating chamber 32. The hydraulic pressure in the pressure regulating chamber 32 is applied to the shift valve system of the automatic transmission via the outlet chamber 35. Next, setting of specification values of the primary weight 28, boost spring 29, break spring 30, etc. will be explained. The force F that presses the governor valve (governor spool) 23 and the governor hydraulic pressure P _G are given by the following equations (1), (2), and (3). F=A・P _G +f _B …(1) F=2/Δ[w・h・(Δ+r _G )+w′・h′・(Δ+r _G
′)/gω ² −(w・r _G +w′・r _G ′)] =A・P _G +f _B ……(2) P _G =2/Δ・A[w・h・(Δ+r _G )+w′・h′・(Δ
+r _G ′)/gω ² −(w・r _G +w′・r _G ′+f _B・Δ/2)
...(3) Here, the above symbols are as follows. w, w′: Primary weight weight, secondary weight weight (hereinafter ′ is secondary) f _B : Break spring force f _sp : Boost spring force r _G , r _G ′h, h′} Weight center of gravity position based on the pin center (r is the rotation radial direction, h is the rotation axis direction) Δ: Distance from the governor rotation axis to the pin center A: Governor valve pressure receiving area g: Gravitational acceleration ω ² : Square of the governor rotation angular velocity Next, start point (governor oil pressure rise If the starting rotation speed) is Ns and the set point (governor hydraulic bending rotation speed) is No, then Ns and
No is given by the following equations (4) and (5). Here, Ns, No, and _PG are set to conditions as shown in the following equations (6), (7), and (8) based on equations (3), (4), and (5). Ns≧350rpm …(6) No=600rpm …(7) P _G when N=600rpm ≧0.835Kg/cm ² …(8) The following values are used as first approximations as constants. . r _G =5.70 ⁽ mm ⁾ , r _G =5.06, h=11.0, h'=7.53, Δ=
11.0w′=0.0101 ⁽ Kg ⁾ Therefore, equations (4), (6), (5), (7), and (3), (8)
From the equations, the following equations (9), (10), and (11) are obtained. f _B ≧ (3.542) W + (0.0216) ... (9) f _sp = (6.2092) W ... (10) f _B ≦ (12.418) W - (0.5742) ... (11) Therefore, (9) ~ By solving equation (11), it is possible to find the regions where f _B -W and f _sp -W exist. Now, if we give the minimum value to W, we will get the value shown in (12) below. W=0.070Kg f _B =0.290Kg f _sp =0.435Kg ...(12) Here, in equations (3) to (5), Ns=250, 300, 400, 450, No=500, 550,
650, P _G =0.835 (however, No. = 550, 650), and a diaphragm was created. This is shown in FIG. In Figure 2, the straight line and the dashed-dotted line are f _B and W
The broken line shows the relational expression between f _sp and W, and the broken line shows the relational expression between f sp and W, respectively. Moreover, point A in the figure is a design point. Therefore, by selecting the specification values within the shaded area in the figure, the specified breakpoint function (Ns =
350rpm, No = 600rpm). Next, a case will be described in which the shape and weight of the conventional primary weight can be accommodated with slight changes. Using the following constant values according to equations (6) to (8) above, f _B −
The region where W, f _sp -W exists was determined. The results are shown in FIG. Point B in the figure indicates the design point. r _G =6.85 ⁽ mm ⁾ , r _G ′=5.06, h=12.61, h′=7.53,
Δ=11w′=0.0101 The specification values in this case were the values shown in the following (13). W = 0.0636Kg f _B = 0.300Kg f _sp = 0.420Kg ... (13) The governor characteristics are as shown in the following (14). Ns=350rpm No=600rpm No=600rpm P _G =0.835Kg/cm ² o'clock N=575rpm (N is governor rotation speed)
...(14) In addition, in equation (13), if f _sp =0.375Kg ...(15), then from equations (5) and (15), No = 568 rpm ...(16) is obtained. Also, the center of gravity of the primary weight (r _G , h)
In order to calculate the weight, the weight was divided into four for each block. The results are shown in (17) below.
Note that V indicates the total volume. V = Σvi = v1 × 2 + v2 + v4 = 8102 Σvi × ri = 55536.6 Σvi × hi = 102144.8 r _G = Σvi × ri / V = 6.85 h = Σvi × hi / V = 12.61 W = γ・V = (7.85 × 10 ^-6 )(8102)=0.0636Kg...(17) Next, the action will be explained. The governor hydraulic characteristics according to this embodiment are given by the above equation (3), and by rearranging this, the following equation (18) is obtained.

[Table] The governor characteristic specification values in this case are as shown in (19) below. w=0.0636Kg w'=0.010Kgf _B =0.30Kg r _G =6.85mm r _G '=5.06mmf _sp =0.42Kg (19) h=12.61mm h'=7.53mmΔ11mm Therefore, (3), (17 ), (18) gives the following (20)
The coefficient of the hydraulic characteristic value shown in the formula is obtained. α1=2/Δ・A w・h・(Δ+r _G )+w′・h′・(Δ+r _G ′)/g(
2π/60) ² = 4.025×10 ^-6 β1=-2/Δ・A (w・r _G +w′・r _G ′ +Δ/2・f _B )=−0.495 α2=2/Δ・A w′・h′・(Δ+r _G ′)/g(2π/60) ² =0.3164×
10 ^-6 β2=2/Δ・A(f _sp・h−w′・r _G ′ −Δ/2・f _B )=0.816 ……(20) Next, the hydraulic pressure is determined by equations (18) and (20). Figure 4 shows the calculated characteristic values. In FIG. 4, curve C shows the one according to the present invention, and curve D shows the one according to the plug-type conventional example. As is clear from FIG. 4, a predetermined breakpoint function can be obtained. In this case, compared to the conventional example, a plug is not required and the depth of the spool hole can be shortened, so costs can be reduced. (Effects of the invention) As explained above, according to this invention,
primary weight, secondary weight,
Since the specification values of the governor spool, break spring, and boost spring are set to have a certain relationship, it is possible to obtain the desired break point function at low cost.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of this invention, Figs. 2 and 3 are explanatory diagrams showing each region of specification values, Fig. 4 is a graph showing the governor hydraulic characteristics, and Fig. 5 is a graph showing the governor hydraulic characteristics.
The figure is a sectional view showing a conventional example. 21...Sleeve, 22...Spool hole, 23
...Governor spool, 25...Support, 26...
...Governor pin, 27...Secondary weight,
28...Primary weight, 29...Boost spring, 30...Break spring.

Claims (1)

[Scope of Claim for Utility Model Registration] A governor spool that is slidable in the axial direction is built into a spool hole formed in a rotating shaft that is a sleeve serving as the governor body, and a support member is fixed to the shaft end of the rotating shaft. The support member is provided with a primary weight and a secondary weight that swing outward around a governor pin by centrifugal rotation, a boost spring is provided between these weights, and a break spring is provided between the bottom of the spool hole and the shaft end of the spool. In the provided governor device, the weight of the primary weight is W, and the spring force of the break spring is
f _B , the spring force of the boost spring is
When fsp, the weight (W ₎ of the primary _weight , the weight of the primary _weight , and the A governor device characterized in that a spring force (f _p ) of a break spring and a spring force (f _sp ) of the boost spring are set.